diff --git a/devtools/cmd/static/main.go b/devtools/cmd/static/main.go
index 3e3c01e..6d2a1d6 100644
--- a/devtools/cmd/static/main.go
+++ b/devtools/cmd/static/main.go
@@ -13,13 +13,11 @@
 )
 
 func main() {
-	_, err := static.Build(static.Config{EntryPoint: "static/frontend", Bundle: true})
-	if err != nil {
+	if err := static.Build(static.Config{EntryPoint: "static/frontend", Bundle: true}); err != nil {
 		log.Fatal(err)
 	}
 
-	_, err = static.Build(static.Config{EntryPoint: "static/worker", Bundle: true})
-	if err != nil {
+	if err := static.Build(static.Config{EntryPoint: "static/worker", Bundle: true}); err != nil {
 		log.Fatal(err)
 	}
 }
diff --git a/go.mod b/go.mod
index b736f7a..c1ec5a5 100644
--- a/go.mod
+++ b/go.mod
@@ -15,7 +15,7 @@
 	github.com/Masterminds/squirrel v1.5.2
 	github.com/alicebob/miniredis/v2 v2.17.0
 	github.com/andybalholm/cascadia v1.3.1
-	github.com/evanw/esbuild v0.14.10
+	github.com/evanw/esbuild v0.17.8
 	github.com/ghodss/yaml v1.0.0
 	github.com/go-git/go-billy/v5 v5.3.1
 	github.com/go-git/go-git/v5 v5.4.2
diff --git a/go.sum b/go.sum
index 20fc108..32748f7 100644
--- a/go.sum
+++ b/go.sum
@@ -399,8 +399,8 @@
 github.com/envoyproxy/protoc-gen-validate v0.1.0 h1:EQciDnbrYxy13PgWoY8AqoxGiPrpgBZ1R8UNe3ddc+A=
 github.com/envoyproxy/protoc-gen-validate v0.1.0/go.mod h1:iSmxcyjqTsJpI2R4NaDN7+kN2VEUnK/pcBlmesArF7c=
 github.com/evanphx/json-patch v4.9.0+incompatible/go.mod h1:50XU6AFN0ol/bzJsmQLiYLvXMP4fmwYFNcr97nuDLSk=
-github.com/evanw/esbuild v0.14.10 h1:+7c1VNndl7uLLxVEeRH4rOUz0Y+nrSw8xfmE9rGtrtw=
-github.com/evanw/esbuild v0.14.10/go.mod h1:GG+zjdi59yh3ehDn4ZWfPcATxjPDUH53iU4ZJbp7dkY=
+github.com/evanw/esbuild v0.17.8 h1:QzE7cRRq7y3qH7ZKGN0/nUGbdZPyikfNaMaCMNUufnU=
+github.com/evanw/esbuild v0.17.8/go.mod h1:iINY06rn799hi48UqEnaQvVfZWe6W9bET78LbvN8VWk=
 github.com/fatih/color v1.7.0/go.mod h1:Zm6kSWBoL9eyXnKyktHP6abPY2pDugNf5KwzbycvMj4=
 github.com/flynn/go-shlex v0.0.0-20150515145356-3f9db97f8568/go.mod h1:xEzjJPgXI435gkrCt3MPfRiAkVrwSbHsst4LCFVfpJc=
 github.com/fogleman/gg v1.2.1-0.20190220221249-0403632d5b90/go.mod h1:R/bRT+9gY/C5z7JzPU0zXsXHKM4/ayA+zqcVNZzPa1k=
@@ -1378,6 +1378,7 @@
 golang.org/x/sys v0.0.0-20211013075003-97ac67df715c/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.0.0-20211124211545-fe61309f8881/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.0.0-20211210111614-af8b64212486/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
+golang.org/x/sys v0.0.0-20220715151400-c0bba94af5f8/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.0.0-20220722155257-8c9f86f7a55f h1:v4INt8xihDGvnrfjMDVXGxw9wrfxYyCjk0KbXjhR55s=
 golang.org/x/sys v0.0.0-20220722155257-8c9f86f7a55f/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/term v0.0.0-20201117132131-f5c789dd3221/go.mod h1:Nr5EML6q2oocZ2LXRh80K7BxOlk5/8JxuGnuhpl+muw=
diff --git a/internal/frontend/server.go b/internal/frontend/server.go
index cd768a6..dae9c63 100644
--- a/internal/frontend/server.go
+++ b/internal/frontend/server.go
@@ -779,8 +779,11 @@
 			panic("staticPath is empty in dev mode; cannot rebuild static files")
 		}
 		ctx := context.Background()
-		_, err := static.Build(static.Config{EntryPoint: s.staticPath + "/frontend", Watch: true, Bundle: true})
-		if err != nil {
+		if err := static.Build(static.Config{
+			EntryPoint: s.staticPath + "/frontend",
+			Watch:      true,
+			Bundle:     true,
+		}); err != nil {
 			log.Error(ctx, err)
 		}
 	}
diff --git a/internal/static/static.go b/internal/static/static.go
index 26b11e2..34065a4 100644
--- a/internal/static/static.go
+++ b/internal/static/static.go
@@ -36,41 +36,45 @@
 // when cmd/frontend is run in dev mode and in
 // devtools/cmd/static/main.go with Watch=false for building
 // productionized assets.
-func Build(config Config) (*api.BuildResult, error) {
+func Build(config Config) error {
 	files, err := getEntry(config.EntryPoint, config.Bundle)
 	if err != nil {
-		return nil, err
+		return err
 	}
 	options := api.BuildOptions{
-		EntryPoints:   files,
-		Bundle:        config.Bundle,
-		Outdir:        config.EntryPoint,
-		Write:         true,
-		Platform:      api.PlatformBrowser,
-		Format:        api.FormatESModule,
-		OutExtensions: map[string]string{".css": ".min.css"},
-		External:      []string{"*.svg"},
+		EntryPoints:  files,
+		Bundle:       config.Bundle,
+		Outdir:       config.EntryPoint,
+		Write:        true,
+		Platform:     api.PlatformBrowser,
+		Format:       api.FormatESModule,
+		OutExtension: map[string]string{".css": ".min.css"},
+		External:     []string{"*.svg"},
 		Banner: map[string]string{"css": "/*!\n" +
 			" * Copyright 2021 The Go Authors. All rights reserved.\n" +
 			" * Use of this source code is governed by a BSD-style\n" +
 			" * license that can be found in the LICENSE file.\n" +
 			" */"},
 	}
-	if config.Watch {
-		options.Watch = &api.WatchMode{}
-	}
 	options.MinifyIdentifiers = true
 	options.MinifySyntax = true
 	options.MinifyWhitespace = true
 	options.Sourcemap = api.SourceMapLinked
+	if config.Watch {
+		ctx, err := api.Context(options)
+		if err != nil {
+			return err
+		}
+		return ctx.Watch(api.WatchOptions{})
+	}
 	result := api.Build(options)
 	if len(result.Errors) > 0 {
-		return nil, fmt.Errorf("error building static files: %v", result.Errors)
+		return fmt.Errorf("error building static files: %v", result.Errors)
 	}
 	if len(result.Warnings) > 0 {
-		return nil, fmt.Errorf("error building static files: %v", result.Warnings)
+		return fmt.Errorf("error building static files: %v", result.Warnings)
 	}
-	return &result, nil
+	return nil
 }
 
 // getEntry walks the the given directory and collects entry file paths
diff --git a/static/frontend/about/index.js b/static/frontend/about/index.js
index 99bd03f..4c6f1a0 100644
--- a/static/frontend/about/index.js
+++ b/static/frontend/about/index.js
@@ -1,4 +1,4 @@
-var O=async function(){if(!["/about"].includes(window.location.pathname))return;let d="h2, h3, h4",u=".LeftNav a",i=document.querySelector(".LeftNav"),c=document.querySelector(".go-Content"),h=!1;function a(t="",r={},...o){if(!t)throw new Error("Provide `type` to create document element.");let n=Object.assign(document.createElement(t),r);return o.forEach(s=>{typeof s=="string"?n.appendChild(document.createTextNode(s)):Array.isArray(s)?s.forEach(l=>n.appendChild(l)):s instanceof HTMLElement&&n.appendChild(s)}),n}function T(){return new Promise((t,r)=>{var s,l,f,L,v,E,p,y,H,A;let o=[],n=[];if(!c||!i)return r(".SiteContent not found.");if(i instanceof HTMLElement&&!((s=i==null?void 0:i.dataset)!=null&&s.hydrate))return t(!0);for(let e of c.querySelectorAll(d))if(e instanceof HTMLElement&&!((l=e==null?void 0:e.dataset)!=null&&l.ignore))switch(e.tagName){case"H2":o=[...o,{id:e.id,label:(f=e==null?void 0:e.dataset)!=null&&f.title?e.dataset.title:(L=e.textContent)!=null?L:""}];break;case"H3":case"H4":(v=o[o.length-1])!=null&&v.subnav?o[o.length-1].subnav&&((A=o[o.length-1].subnav)==null||A.push({id:e.id,label:(y=e==null?void 0:e.dataset)!=null&&y.title?e.dataset.title:(H=e.textContent)!=null?H:""})):o[o.length-1].subnav=[{id:e.id,label:(E=e==null?void 0:e.dataset)!=null&&E.title?e.dataset.title:(p=e.textContent)!=null?p:""}];break}for(let e of o){let C=a("a",{href:"#"+e.id},a("span",{},e.label));if(n=[...n,C],e!=null&&e.subnav){let b=[];for(let M of e.subnav){let x=a("li",{},a("a",{href:"#"+M.id},a("img",{src:"/static/frontend/about/dot.svg",width:"5",height:"5"}),a("span",{},M.label)));b=[...b,x]}let N=a("ul",{className:"LeftSubnav"},b);n=[...n,N]}}return n.forEach(e=>i.appendChild(e)),t(!0)})}function S(){return new Promise(t=>{if(!document.querySelectorAll(u))return t(!0);for(let r of document.querySelectorAll(u))if(r instanceof HTMLAnchorElement&&r.href===location.href){m(r);break}t(!0)})}function k(){return new Promise(t=>{if(!document.querySelectorAll(u))return t(!0);for(let r of document.querySelectorAll(u))r.classList.remove("active");t(!0)})}function m(t){t instanceof HTMLAnchorElement&&k().then(()=>{var o,n,s;t.classList.add("active");let r=(o=t==null?void 0:t.parentNode)==null?void 0:o.parentNode;r instanceof HTMLElement&&((n=r==null?void 0:r.classList)==null?void 0:n.contains("LeftSubnav"))&&((s=r.previousElementSibling)==null||s.classList.add("active"))})}function w(){g();let t=document.querySelector('[href="'+location.hash+'"]');t instanceof HTMLAnchorElement&&m(t)}function g(){h=!0,setTimeout(()=>{h=!1},200)}function q(){var t;if(window.addEventListener("hashchange",w),c!=null&&c.querySelectorAll(d)){let r=n=>{if(!h&&Array.isArray(n)&&n.length>0){for(let s of n)if(s.isIntersecting&&s.target instanceof HTMLElement){let{id:l}=s.target,f=document.querySelector('[href="#'+l+'"]');f instanceof HTMLAnchorElement&&m(f);break}}},o=new IntersectionObserver(r,{threshold:0,rootMargin:"0px 0px -50% 0px"});for(let n of c.querySelectorAll(d))n instanceof HTMLElement&&!((t=n==null?void 0:n.dataset)!=null&&t.ignore)&&o.observe(n)}}try{await T(),await S(),location.hash&&g(),q()}catch(t){t instanceof Error?console.error(t.message):console.error(t)}};export{O as initJumpLinks};
+var O=async function(){if(!["/about"].includes(window.location.pathname))return;let d="h2, h3, h4",u=".LeftNav a",i=document.querySelector(".LeftNav"),c=document.querySelector(".go-Content"),h=!1;function a(t="",r={},...o){if(!t)throw new Error("Provide `type` to create document element.");let n=Object.assign(document.createElement(t),r);return o.forEach(s=>{typeof s=="string"?n.appendChild(document.createTextNode(s)):Array.isArray(s)?s.forEach(l=>n.appendChild(l)):s instanceof HTMLElement&&n.appendChild(s)}),n}function T(){return new Promise((t,r)=>{var s,l,f,L,v,E,p,y,H,A;let o=[],n=[];if(!c||!i)return r(".SiteContent not found.");if(i instanceof HTMLElement&&!((s=i==null?void 0:i.dataset)!=null&&s.hydrate))return t(!0);for(let e of c.querySelectorAll(d))if(e instanceof HTMLElement&&!((l=e==null?void 0:e.dataset)!=null&&l.ignore))switch(e.tagName){case"H2":o=[...o,{id:e.id,label:(f=e==null?void 0:e.dataset)!=null&&f.title?e.dataset.title:(L=e.textContent)!=null?L:""}];break;case"H3":case"H4":(v=o[o.length-1])!=null&&v.subnav?o[o.length-1].subnav&&((A=o[o.length-1].subnav)==null||A.push({id:e.id,label:(y=e==null?void 0:e.dataset)!=null&&y.title?e.dataset.title:(H=e.textContent)!=null?H:""})):o[o.length-1].subnav=[{id:e.id,label:(E=e==null?void 0:e.dataset)!=null&&E.title?e.dataset.title:(p=e.textContent)!=null?p:""}];break}for(let e of o){let C=a("a",{href:"#"+e.id},a("span",{},e.label));if(n=[...n,C],e!=null&&e.subnav){let b=[];for(let M of e.subnav){let x=a("li",{},a("a",{href:"#"+M.id},a("img",{src:"/static/frontend/about/dot.svg",width:"5",height:"5"}),a("span",{},M.label)));b=[...b,x]}let N=a("ul",{className:"LeftSubnav"},b);n=[...n,N]}}return n.forEach(e=>i.appendChild(e)),t(!0)})}function S(){return new Promise(t=>{if(!document.querySelectorAll(u))return t(!0);for(let r of document.querySelectorAll(u))if(r instanceof HTMLAnchorElement&&r.href===location.href){m(r);break}t(!0)})}function k(){return new Promise(t=>{if(!document.querySelectorAll(u))return t(!0);for(let r of document.querySelectorAll(u))r.classList.remove("active");t(!0)})}function m(t){t instanceof HTMLAnchorElement&&k().then(()=>{var o,n,s;t.classList.add("active");let r=(o=t==null?void 0:t.parentNode)==null?void 0:o.parentNode;r instanceof HTMLElement&&((n=r==null?void 0:r.classList)!=null&&n.contains("LeftSubnav"))&&((s=r.previousElementSibling)==null||s.classList.add("active"))})}function w(){g();let t=document.querySelector('[href="'+location.hash+'"]');t instanceof HTMLAnchorElement&&m(t)}function g(){h=!0,setTimeout(()=>{h=!1},200)}function q(){var t;if(window.addEventListener("hashchange",w),c!=null&&c.querySelectorAll(d)){let r=n=>{if(!h&&Array.isArray(n)&&n.length>0){for(let s of n)if(s.isIntersecting&&s.target instanceof HTMLElement){let{id:l}=s.target,f=document.querySelector('[href="#'+l+'"]');f instanceof HTMLAnchorElement&&m(f);break}}},o=new IntersectionObserver(r,{threshold:0,rootMargin:"0px 0px -50% 0px"});for(let n of c.querySelectorAll(d))n instanceof HTMLElement&&!((t=n==null?void 0:n.dataset)!=null&&t.ignore)&&o.observe(n)}}try{await T(),await S(),location.hash&&g(),q()}catch(t){t instanceof Error?console.error(t.message):console.error(t)}};export{O as initJumpLinks};
 /**
  * @license
  * Copyright 2022 The Go Authors. All rights reserved.
diff --git a/static/frontend/about/index.js.map b/static/frontend/about/index.js.map
index bea2a15..7cd2888 100644
--- a/static/frontend/about/index.js.map
+++ b/static/frontend/about/index.js.map
@@ -2,6 +2,6 @@
   "version": 3,
   "sources": ["index.ts"],
   "sourcesContent": ["/**\n * @license\n * Copyright 2022 The Go Authors. All rights reserved.\n * Use of this source code is governed by a BSD-style\n * license that can be found in the LICENSE file.\n */\n\n/**\n * Left Navigation.\n */\nexport const initJumpLinks = async function () {\n  const pagesWithJumpLinks = ['/about'];\n  if (!pagesWithJumpLinks.includes(window.location.pathname)) {\n    // stop the file from doing anything else if the page doesn't have jumplinks\n    return;\n  }\n\n  // these might be generated or not so don't grab references to the elements until actually need them.\n  const titles = 'h2, h3, h4';\n  const nav = '.LeftNav a';\n  // these are always in the dom so we can get them now and throw errors if they're not.\n  const leftNav = document.querySelector('.LeftNav');\n  const siteContent = document.querySelector('.go-Content');\n  let isObserverDisabled = false;\n\n  /**\n   * El function\n   * @example el('h1', {className: 'title'}, 'Welcome to the site');\n   * @example el('ul', {className: 'list'}, el('li', {}, 'Item one'), el('li', {}, 'Item two'), el('li', {}, 'Item three'));\n   * @example el('img', {src: '/url.svg'});\n   */\n  function el(\n    type = '',\n    props: { [key: string]: string } = {},\n    ...children: (HTMLElement | HTMLElement[] | string | undefined)[]\n  ) {\n    // Error, no type declared.\n    if (!type) {\n      throw new Error('Provide `type` to create document element.');\n    }\n\n    // Create element with optional attribute props\n    const docEl = Object.assign(document.createElement(type), props);\n\n    // Children: array containing strings or elements\n    children.forEach(child => {\n      if (typeof child === 'string') {\n        docEl.appendChild(document.createTextNode(child));\n      } else if (Array.isArray(child)) {\n        child.forEach(c => docEl.appendChild(c));\n      } else if (child instanceof HTMLElement) {\n        docEl.appendChild(child);\n      }\n    });\n\n    return docEl;\n  }\n  /**  Build Nav if data hydrate is present. */\n  function buildNav() {\n    return new Promise((resolve, reject) => {\n      let navItems: { id: string; label: string; subnav?: { id: string; label: string }[] }[] = [];\n      let elements: HTMLElement[] = [];\n\n      if (!siteContent || !leftNav) {\n        return reject('.SiteContent not found.');\n      }\n      if (leftNav instanceof HTMLElement && !leftNav?.dataset?.hydrate) {\n        return resolve(true);\n      }\n\n      for (const title of siteContent.querySelectorAll(titles)) {\n        if (title instanceof HTMLElement && !title?.dataset?.ignore) {\n          switch (title.tagName) {\n            case 'H2':\n              navItems = [\n                ...navItems,\n                {\n                  id: title.id,\n                  label: title?.dataset?.title ? title.dataset.title : title.textContent ?? '',\n                },\n              ];\n              break;\n\n            case 'H3':\n            case 'H4':\n              if (!navItems[navItems.length - 1]?.subnav) {\n                navItems[navItems.length - 1].subnav = [\n                  {\n                    id: title.id,\n                    label: title?.dataset?.title ? title.dataset.title : title.textContent ?? '',\n                  },\n                ];\n              } else if (navItems[navItems.length - 1].subnav) {\n                navItems[navItems.length - 1].subnav?.push({\n                  id: title.id,\n                  label: title?.dataset?.title ? title.dataset.title : title.textContent ?? '',\n                });\n              }\n              break;\n          }\n        }\n      }\n\n      for (const navItem of navItems) {\n        const link = el('a', { href: '#' + navItem.id }, el('span', {}, navItem.label));\n        elements = [...elements, link];\n        if (navItem?.subnav) {\n          let subLinks: HTMLElement[] = [];\n          for (const subnavItem of navItem.subnav) {\n            const subItem = el(\n              'li',\n              {},\n              el(\n                'a',\n                { href: '#' + subnavItem.id },\n                el('img', { src: '/static/frontend/about/dot.svg', width: '5', height: '5' }),\n                el('span', {}, subnavItem.label)\n              )\n            );\n            subLinks = [...subLinks, subItem];\n          }\n          const list = el('ul', { className: 'LeftSubnav' }, subLinks);\n          elements = [...elements, list];\n        }\n      }\n\n      elements.forEach(element => leftNav.appendChild(element));\n\n      return resolve(true);\n    });\n  }\n  /**\n   * Set the correct active element.\n   */\n  function setNav() {\n    return new Promise(resolve => {\n      if (!document.querySelectorAll(nav)) return resolve(true);\n      for (const a of document.querySelectorAll(nav)) {\n        if (a instanceof HTMLAnchorElement && a.href === location.href) {\n          setElementActive(a);\n          break;\n        }\n      }\n      resolve(true);\n    });\n  }\n  /** resetNav: removes all .active from nav elements */\n  function resetNav() {\n    return new Promise(resolve => {\n      if (!document.querySelectorAll(nav)) return resolve(true);\n      for (const a of document.querySelectorAll(nav)) {\n        a.classList.remove('active');\n      }\n      resolve(true);\n    });\n  }\n  /** setElementActive: controls resetting nav and highlighting the appropriate nav items */\n  function setElementActive(element: HTMLAnchorElement) {\n    if (element instanceof HTMLAnchorElement) {\n      resetNav().then(() => {\n        element.classList.add('active');\n        const parent = element?.parentNode?.parentNode;\n        if (parent instanceof HTMLElement && parent?.classList?.contains('LeftSubnav')) {\n          parent.previousElementSibling?.classList.add('active');\n        }\n      });\n    }\n  }\n  /** setLinkManually: disables observer and selects the clicked nav item. */\n  function setLinkManually() {\n    delayObserver();\n    const link = document.querySelector('[href=\"' + location.hash + '\"]');\n    if (link instanceof HTMLAnchorElement) {\n      setElementActive(link);\n    }\n  }\n  /** delayObserver: Quick on off switch for intersection observer. */\n  function delayObserver() {\n    isObserverDisabled = true;\n    setTimeout(() => {\n      isObserverDisabled = false;\n    }, 200);\n  }\n  /** observeSections: kicks off observation of titles as well as manual clicks with hashchange */\n  function observeSections() {\n    window.addEventListener('hashchange', setLinkManually);\n\n    if (siteContent?.querySelectorAll(titles)) {\n      const callback: IntersectionObserverCallback = entries => {\n        if (!isObserverDisabled && Array.isArray(entries) && entries.length > 0) {\n          for (const entry of entries) {\n            if (entry.isIntersecting && entry.target instanceof HTMLElement) {\n              const { id } = entry.target;\n              const link = document.querySelector('[href=\"#' + id + '\"]');\n              if (link instanceof HTMLAnchorElement) {\n                setElementActive(link);\n              }\n              break;\n            }\n          }\n        }\n      };\n      // rootMargin is important when multiple sections are in the observable area **on page load**.\n      // they will still be highlighted on scroll because of the root margin.\n      const ob = new IntersectionObserver(callback, {\n        threshold: 0,\n        rootMargin: '0px 0px -50% 0px',\n      });\n      for (const title of siteContent.querySelectorAll(titles)) {\n        if (title instanceof HTMLElement && !title?.dataset?.ignore) {\n          ob.observe(title);\n        }\n      }\n    }\n  }\n\n  try {\n    await buildNav();\n    await setNav();\n    if (location.hash) {\n      delayObserver();\n    }\n    observeSections();\n  } catch (e) {\n    if (e instanceof Error) {\n      console.error(e.message);\n    } else {\n      console.error(e);\n    }\n  }\n};\n"],
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 }
diff --git a/static/frontend/fetch/fetch.js.map b/static/frontend/fetch/fetch.js.map
index 36be84d..01cf795 100644
--- a/static/frontend/fetch/fetch.js.map
+++ b/static/frontend/fetch/fetch.js.map
@@ -2,6 +2,6 @@
   "version": 3,
   "sources": ["fetch.ts"],
   "sourcesContent": ["/*!\n * @license\n * Copyright 2020 The Go Authors. All rights reserved.\n * Use of this source code is governed by a BSD-style\n * license that can be found in the LICENSE file.\n */\n\nconst fetchButton = document.querySelector('.js-fetchButton');\nif (fetchButton) {\n  fetchButton.addEventListener('click', e => {\n    e.preventDefault();\n    fetchPath();\n  });\n}\n\nasync function fetchPath() {\n  const fetchMessageEl = document.querySelector<HTMLHeadingElement>('.js-fetchMessage');\n  const fetchMessageSecondary = document.querySelector<HTMLParagraphElement>(\n    '.js-fetchMessageSecondary'\n  );\n  const fetchButton = document.querySelector<HTMLButtonElement>('.js-fetchButton');\n  const fetchLoading = document.querySelector<HTMLDivElement>('.js-fetchLoading');\n  if (!(fetchMessageEl && fetchMessageSecondary && fetchButton && fetchLoading)) {\n    return;\n  }\n  fetchMessageEl.textContent = `Fetching ${fetchMessageEl.dataset.path}`;\n  fetchMessageSecondary.textContent =\n    'Feel free to navigate away and check back later, we\u2019ll keep working on it!';\n  fetchButton.style.display = 'none';\n  fetchLoading.style.display = 'block';\n\n  const response = await fetch(`/fetch${window.location.pathname}`, { method: 'POST' });\n  if (response.ok) {\n    window.location.reload();\n    return;\n  }\n  const responseText = await response.text();\n  fetchLoading.style.display = 'none';\n  fetchMessageSecondary.textContent = '';\n  const responseTextParsedDOM = new DOMParser().parseFromString(responseText, 'text/html');\n  fetchMessageEl.innerHTML = responseTextParsedDOM.documentElement.textContent ?? '';\n}\n\nexport {};\n"],
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+  "mappings": "AAOA,IAAMA,EAAc,SAAS,cAAc,iBAAiB,EACxDA,GACFA,EAAY,iBAAiB,QAAS,GAAK,CACzC,EAAE,eAAe,EACjBC,EAAU,CACZ,CAAC,EAGH,eAAeA,GAAY,CAf3B,IAAAC,EAgBE,IAAMC,EAAiB,SAAS,cAAkC,kBAAkB,EAC9EC,EAAwB,SAAS,cACrC,2BACF,EACMJ,EAAc,SAAS,cAAiC,iBAAiB,EACzEK,EAAe,SAAS,cAA8B,kBAAkB,EAC9E,GAAI,EAAEF,GAAkBC,GAAyBJ,GAAeK,GAC9D,OAEFF,EAAe,YAAc,YAAYA,EAAe,QAAQ,OAChEC,EAAsB,YACpB,kFACFJ,EAAY,MAAM,QAAU,OAC5BK,EAAa,MAAM,QAAU,QAE7B,IAAMC,EAAW,MAAM,MAAM,SAAS,OAAO,SAAS,WAAY,CAAE,OAAQ,MAAO,CAAC,EACpF,GAAIA,EAAS,GAAI,CACf,OAAO,SAAS,OAAO,EACvB,OAEF,IAAMC,EAAe,MAAMD,EAAS,KAAK,EACzCD,EAAa,MAAM,QAAU,OAC7BD,EAAsB,YAAc,GACpC,IAAMI,EAAwB,IAAI,UAAU,EAAE,gBAAgBD,EAAc,WAAW,EACvFJ,EAAe,WAAYD,EAAAM,EAAsB,gBAAgB,cAAtC,KAAAN,EAAqD,EAClF",
   "names": ["fetchButton", "fetchPath", "_a", "fetchMessageEl", "fetchMessageSecondary", "fetchLoading", "response", "responseText", "responseTextParsedDOM"]
 }
diff --git a/static/frontend/frontend.js b/static/frontend/frontend.js
index 89c6416..c2957b6 100644
--- a/static/frontend/frontend.js
+++ b/static/frontend/frontend.js
@@ -1,4 +1,4 @@
-function P(){let n=document.querySelector(".js-header");document.querySelectorAll(".js-desktop-menu-hover").forEach(c=>{c.addEventListener("mouseenter",a=>{let u=a.target,s=document.querySelector(".forced-open");s&&s!==c&&(s.blur(),s.classList.remove("forced-open")),u.focus(),u.blur()});let r=a=>{var d,h;let u=a.target,s=u==null?void 0:u.classList.contains("forced-open"),t=a.currentTarget;s?(t.removeEventListener("blur",()=>t.classList.remove("forced-open")),t.classList.remove("forced-open"),t.classList.add("forced-closed"),t.blur(),(d=t==null?void 0:t.parentNode)==null||d.addEventListener("mouseout",()=>{t.classList.remove("forced-closed")})):(t.classList.remove("forced-closed"),t.classList.add("forced-open"),t.focus(),t.addEventListener("blur",()=>t.classList.remove("forced-open")),(h=t==null?void 0:t.parentNode)==null||h.removeEventListener("mouseout",()=>{t.classList.remove("forced-closed")}))};c.addEventListener("click",r)}),document.querySelectorAll(".Header-menuItem").forEach(c=>{c.addEventListener("keyup",r=>{var u;let a=r;a.key==="Escape"&&((u=a.target)==null||u.blur())})});let i=document.querySelectorAll(".js-headerMenuButton");i.forEach(c=>{c.addEventListener("click",r=>{r.preventDefault();let a=n==null?void 0:n.classList.contains("is-active");a?g(n):w(n),c.setAttribute("aria-expanded",a?"true":"false")})});let l=document.querySelector(".js-scrim");l==null||l.addEventListener("click",c=>{c.preventDefault(),document.querySelectorAll(".go-NavigationDrawer-submenuItem.is-active").forEach(a=>g(a)),g(n),i.forEach(a=>{a.setAttribute("aria-expanded",n!=null&&n.classList.contains("is-active")?"true":"false")})});let m=c=>{if(!c)return[];let r=Array.from(c.querySelectorAll(":scope > .go-NavigationDrawer-nav > .go-NavigationDrawer-list > .go-NavigationDrawer-listItem > a, :scope 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r=m(c);c.classList.add("is-active"),r.forEach(a=>a.setAttribute("tabindex","0")),r[0].focus(),r[0].addEventListener("keydown",L(c)),r[r.length-1].addEventListener("keydown",b(c))},L=c=>r=>{r.key==="Tab"&&r.shiftKey&&(r.preventDefault(),g(c))},b=c=>r=>{r.key==="Tab"&&!r.shiftKey&&(r.preventDefault(),g(c))},M=c=>{var u;let r=p(c),a=m(c);c.addEventListener("keyup",s=>{s.key==="Escape"&&g(c)}),a.forEach(s=>{let t=s.closest("li");if(t&&t.classList.contains("js-mobile-subnav-trigger")){let d=t.querySelector(".go-NavigationDrawer-submenuItem");s.addEventListener("click",()=>{w(d)})}}),r&&(g(c),(u=c==null?void 0:c.querySelector(".go-NavigationDrawer-header"))==null||u.addEventListener("click",s=>{s.preventDefault(),g(c)}))};document.querySelectorAll(".go-NavigationDrawer").forEach(c=>M(c)),g(n)}function U(){let n=document.querySelector(".js-searchForm"),e=document.querySelector(".js-expandSearch"),o=n==null?void 0:n.querySelector("input"),i=document.querySelector(".js-headerLogo"),l=document.querySelector(".js-headerMenuButton");e==null||e.addEventListener("click",()=>{n==null||n.classList.add("go-SearchForm--expanded"),i==null||i.classList.add("go-Header-logo--hidden"),l==null||l.classList.add("go-Header-navOpen--hidden"),o==null||o.focus()}),document==null||document.addEventListener("click",m=>{n!=null&&n.contains(m.target)||(n==null||n.classList.remove("go-SearchForm--expanded"),i==null||i.classList.remove("go-Header-logo--hidden"),l==null||l.classList.remove("go-Header-navOpen--hidden"))})}var k=class{constructor(e){this.el=e;this.setActive=e=>{this.activeIndex=(e+this.slides.length)%this.slides.length,this.el.setAttribute("data-slide-index",String(this.activeIndex));for(let o of this.dots)o.classList.remove("go-Carousel-dot--active");this.dots[this.activeIndex].classList.add("go-Carousel-dot--active");for(let o of this.slides)o.setAttribute("aria-hidden","true");this.slides[this.activeIndex].removeAttribute("aria-hidden"),this.liveRegion.textContent="Slide "+(this.activeIndex+1)+" of "+this.slides.length};var o;this.slides=Array.from(e.querySelectorAll(".go-Carousel-slide")),this.dots=[],this.liveRegion=document.createElement("div"),this.activeIndex=Number((o=e.getAttribute("data-slide-index"))!=null?o:0),this.initSlides(),this.initArrows(),this.initDots(),this.initLiveRegion()}initSlides(){for(let[e,o]of this.slides.entries())e!==this.activeIndex&&o.setAttribute("aria-hidden","true")}initArrows(){var o,i;let e=document.createElement("ul");e.classList.add("go-Carousel-arrows"),e.innerHTML=`
+function P(){let n=document.querySelector(".js-header");document.querySelectorAll(".js-desktop-menu-hover").forEach(c=>{c.addEventListener("mouseenter",a=>{let u=a.target,s=document.querySelector(".forced-open");s&&s!==c&&(s.blur(),s.classList.remove("forced-open")),u.focus(),u.blur()});let r=a=>{var d,h;let u=a.target,s=u==null?void 0:u.classList.contains("forced-open"),t=a.currentTarget;s?(t.removeEventListener("blur",()=>t.classList.remove("forced-open")),t.classList.remove("forced-open"),t.classList.add("forced-closed"),t.blur(),(d=t==null?void 0:t.parentNode)==null||d.addEventListener("mouseout",()=>{t.classList.remove("forced-closed")})):(t.classList.remove("forced-closed"),t.classList.add("forced-open"),t.focus(),t.addEventListener("blur",()=>t.classList.remove("forced-open")),(h=t==null?void 0:t.parentNode)==null||h.removeEventListener("mouseout",()=>{t.classList.remove("forced-closed")}))};c.addEventListener("click",r)}),document.querySelectorAll(".Header-menuItem").forEach(c=>{c.addEventListener("keyup",r=>{var u;let a=r;a.key==="Escape"&&((u=a.target)==null||u.blur())})});let i=document.querySelectorAll(".js-headerMenuButton");i.forEach(c=>{c.addEventListener("click",r=>{r.preventDefault();let a=n==null?void 0:n.classList.contains("is-active");a?g(n):w(n),c.setAttribute("aria-expanded",a?"true":"false")})});let l=document.querySelector(".js-scrim");l==null||l.addEventListener("click",c=>{c.preventDefault(),document.querySelectorAll(".go-NavigationDrawer-submenuItem.is-active").forEach(a=>g(a)),g(n),i.forEach(a=>{a.setAttribute("aria-expanded",n!=null&&n.classList.contains("is-active")?"true":"false")})});let m=c=>{if(!c)return[];let r=Array.from(c.querySelectorAll(":scope > .go-NavigationDrawer-nav > .go-NavigationDrawer-list > .go-NavigationDrawer-listItem > a, :scope 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this.slides)o.setAttribute("aria-hidden","true");this.slides[this.activeIndex].removeAttribute("aria-hidden"),this.liveRegion.textContent="Slide "+(this.activeIndex+1)+" of "+this.slides.length};var o;this.slides=Array.from(e.querySelectorAll(".go-Carousel-slide")),this.dots=[],this.liveRegion=document.createElement("div"),this.activeIndex=Number((o=e.getAttribute("data-slide-index"))!=null?o:0),this.initSlides(),this.initArrows(),this.initDots(),this.initLiveRegion()}initSlides(){for(let[e,o]of this.slides.entries())e!==this.activeIndex&&o.setAttribute("aria-hidden","true")}initArrows(){var o,i;let e=document.createElement("ul");e.classList.add("go-Carousel-arrows"),e.innerHTML=`
       <li>
         <button class="go-Carousel-prevSlide" aria-label="Go to previous slide">
           <img class="go-Icon" height="24" width="24" src="/static/shared/icon/arrow_left_gm_grey_24dp.svg" alt="">
@@ -9,7 +9,13 @@
           <img class="go-Icon" height="24" width="24" src="/static/shared/icon/arrow_right_gm_grey_24dp.svg" alt="">
         </button>
       </li>
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o="";location.hostname.endsWith("go.dev")&&(o="domain=.go.dev;"),document.documentElement.setAttribute("data-theme",n),document.cookie=`prefers-color-scheme=${n};${o}path=/;max-age=31536000;`}
+    `,(o=e.querySelector(".go-Carousel-prevSlide"))==null||o.addEventListener("click",()=>this.setActive(this.activeIndex-1)),(i=e.querySelector(".go-Carousel-nextSlide"))==null||i.addEventListener("click",()=>this.setActive(this.activeIndex+1)),this.el.append(e)}initDots(){let e=document.createElement("ul");e.classList.add("go-Carousel-dots");for(let o=0;o<this.slides.length;o++){let i=document.createElement("li"),l=document.createElement("button");l.classList.add("go-Carousel-dot"),o===this.activeIndex&&l.classList.add("go-Carousel-dot--active"),l.innerHTML=`<span class="go-Carousel-obscured">Slide ${o+1}</span>`,l.addEventListener("click",()=>this.setActive(o)),i.append(l),e.append(i),this.dots.push(l)}this.el.append(e)}initLiveRegion(){this.liveRegion.setAttribute("aria-live","polite"),this.liveRegion.setAttribute("aria-atomic","true"),this.liveRegion.setAttribute("class","go-Carousel-obscured"),this.liveRegion.textContent=`Slide ${this.activeIndex+1} of 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q=class{constructor(e){this.el=e;this.el.addEventListener("change",o=>{let i=o.target,l=i.value;i.value.startsWith("/")||(l="/"+l),window.location.href=l})}};var C=class{constructor(e){this.el=e;window.dialogPolyfill&&window.dialogPolyfill.registerDialog(e),this.init()}init(){let e=document.querySelector(`[aria-controls="${this.el.id}"]`);e&&e.addEventListener("click",()=>{var o;this.el.showModal?this.el.showModal():this.el.setAttribute("opened","true"),(o=this.el.querySelector("input"))==null||o.focus()});for(let o of this.el.querySelectorAll("[data-modal-close]"))o.addEventListener("click",()=>{this.el.close?this.el.close():this.el.removeAttribute("opened")})}};function I(n,e,o,i){var l;(l=window.dataLayer)!=null||(window.dataLayer=[]),typeof n=="string"?window.dataLayer.push({event:n,event_category:e,event_action:o,event_label:i}):window.dataLayer.push(n)}function W(n){var e;(e=window.dataLayer)!=null||(window.dataLayer=[]),window.dataLayer.push(n)}var 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0:n.showModal)==null||s.call(n),i==null||i.focus())}),(u=document.querySelector(".js-openShortcuts"))==null||u.addEventListener("click",()=>{var s;(s=r==null?void 0:r.showModal)==null||s.call(r)})}var G=async function(){if(!["/about"].includes(window.location.pathname))return;let e="h2, h3, h4",o=".LeftNav a",i=document.querySelector(".LeftNav"),l=document.querySelector(".go-Content"),m=!1;function p(a="",u={},...s){if(!a)throw new Error("Provide `type` to create document element.");let t=Object.assign(document.createElement(a),u);return s.forEach(d=>{typeof d=="string"?t.appendChild(document.createTextNode(d)):Array.isArray(d)?d.forEach(h=>t.appendChild(h)):d instanceof HTMLElement&&t.appendChild(d)}),t}function g(){return new Promise((a,u)=>{var d,h,E,S,v,y,T,J,R,_;let s=[],t=[];if(!l||!i)return u(".SiteContent not found.");if(i instanceof HTMLElement&&!((d=i==null?void 0:i.dataset)!=null&&d.hydrate))return a(!0);for(let f of l.querySelectorAll(e))if(f instanceof 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Promise(a=>{if(!document.querySelectorAll(o))return a(!0);for(let u of document.querySelectorAll(o))if(u instanceof HTMLAnchorElement&&u.href===location.href){b(u);break}a(!0)})}function L(){return new Promise(a=>{if(!document.querySelectorAll(o))return a(!0);for(let u of document.querySelectorAll(o))u.classList.remove("active");a(!0)})}function b(a){a instanceof HTMLAnchorElement&&L().then(()=>{var s,t,d;a.classList.add("active");let u=(s=a==null?void 0:a.parentNode)==null?void 0:s.parentNode;u instanceof HTMLElement&&((t=u==null?void 0:u.classList)!=null&&t.contains("LeftSubnav"))&&((d=u.previousElementSibling)==null||d.classList.add("active"))})}function M(){c();let a=document.querySelector('[href="'+location.hash+'"]');a instanceof HTMLAnchorElement&&b(a)}function c(){m=!0,setTimeout(()=>{m=!1},200)}function r(){var a;if(window.addEventListener("hashchange",M),l!=null&&l.querySelectorAll(e)){let u=t=>{if(!m&&Array.isArray(t)&&t.length>0){for(let d of t)if(d.isIntersecting&&d.target 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document.querySelectorAll(".js-toggleTheme"))e.addEventListener("click",()=>{Y()});(n=document.querySelector(".js-gtmID"))!=null&&n.dataset.gtmid&&window.dataLayer?W(function(){B()}):B(),P(),U(),$(),G()});H.on("/","focus search",n=>{let e=Array.from(document.querySelectorAll(".js-searchFocus")).pop();e&&!window.navigator.userAgent.includes("Firefox")&&(n.preventDefault(),e.focus())});H.on("y","set canonical url",()=>{var e;let n=(e=document.querySelector(".js-canonicalURLPath"))==null?void 0:e.dataset.canonicalUrlPath;if(n&&n!==""){let o=window.location.hash;o&&(n+=o),window.history.replaceState(null,"",n)}});(function(){I({"gtm.start":new Date().getTime(),event:"gtm.js"})})();function B(){let n=new URLSearchParams(window.location.search),e=n.get("utm_source");if(e!=="gopls"&&e!=="godoc"&&e!=="pkggodev")return;let o=new URL(window.location.href);n.delete("utm_source"),o.search=n.toString(),window.history.replaceState(null,"",o.toString())}function Y(){let n="dark",e=document.documentElement.getAttribute("data-theme");e==="dark"?n="light":e==="light"&&(n="auto");let o="";location.hostname.endsWith("go.dev")&&(o="domain=.go.dev;"),document.documentElement.setAttribute("data-theme",n),document.cookie=`prefers-color-scheme=${n};${o}path=/;max-age=31536000;`}
+/**
+ * @license
+ * Copyright 2021 The Go Authors. All rights reserved.
+ * Use of this source code is governed by a BSD-style
+ * license that can be found in the LICENSE file.
+ */
 /*!
  * @license
  * Copyright 2019-2020 The Go Authors. All rights reserved.
@@ -18,20 +24,14 @@
  */
 /**
  * @license
- * Copyright 2020 The Go Authors. All rights reserved.
- * Use of this source code is governed by a BSD-style
- * license that can be found in the LICENSE file.
- */
-/**
- * @license
- * Copyright 2021 The Go Authors. All rights reserved.
- * Use of this source code is governed by a BSD-style
- * license that can be found in the LICENSE file.
- */
-/**
- * @license
  * Copyright 2022 The Go Authors. All rights reserved.
  * Use of this source code is governed by a BSD-style
  * license that can be found in the LICENSE file.
  */
+/**
+ * @license
+ * Copyright 2020 The Go Authors. All rights reserved.
+ * Use of this source code is governed by a BSD-style
+ * license that can be found in the LICENSE file.
+ */
 //# sourceMappingURL=frontend.js.map
diff --git a/static/frontend/frontend.js.map b/static/frontend/frontend.js.map
index a839474..3a51c4d 100644
--- a/static/frontend/frontend.js.map
+++ b/static/frontend/frontend.js.map
@@ -2,6 +2,6 @@
   "version": 3,
   "sources": ["../shared/header/header.ts", "../shared/carousel/carousel.ts", "../shared/clipboard/clipboard.ts", "../shared/tooltip/tooltip.ts", "../shared/outline/select.ts", "../shared/modal/modal.ts", "../shared/analytics/analytics.ts", "../shared/keyboard/keyboard.ts", "../shared/jump/jump.ts", "about/index.ts", "frontend.ts"],
   "sourcesContent": ["/**\n * @license\n * Copyright 2021 The Go Authors. All rights reserved.\n * Use of this source code is governed by a BSD-style\n * license that can be found in the LICENSE file.\n */\n\nexport function registerHeaderListeners(): void {\n  const header = document.querySelector('.js-header') as HTMLElement;\n\n  // Desktop menu hover state\n  const menuItemHovers = document.querySelectorAll('.js-desktop-menu-hover');\n  menuItemHovers.forEach(menuItemHover => {\n    // when user clicks on the dropdown menu item on desktop or mobile,\n    // force the menu to stay open until the user clicks off of it.\n    menuItemHover.addEventListener('mouseenter', e => {\n      const target = e.target as HTMLElement;\n      const forced = document.querySelector('.forced-open') as HTMLElement;\n      if (forced && forced !== menuItemHover) {\n        forced.blur();\n        forced.classList.remove('forced-open');\n      }\n      // prevents menus that have been tabbed into from staying open\n      // when you hover over another menu\n      target.focus();\n      target.blur();\n    });\n\n    const toggleForcedOpen = (e: Event) => {\n      const target = e.target as HTMLElement;\n      const isForced = target?.classList.contains('forced-open');\n      const currentTarget = e.currentTarget as HTMLElement;\n      if (isForced) {\n        currentTarget.removeEventListener('blur', () =>\n          currentTarget.classList.remove('forced-open')\n        );\n        currentTarget.classList.remove('forced-open');\n        currentTarget.classList.add('forced-closed');\n        currentTarget.blur();\n        currentTarget?.parentNode?.addEventListener('mouseout', () => {\n          currentTarget.classList.remove('forced-closed');\n        });\n      } else {\n        currentTarget.classList.remove('forced-closed');\n        currentTarget.classList.add('forced-open');\n        currentTarget.focus();\n        currentTarget.addEventListener('blur', () => currentTarget.classList.remove('forced-open'));\n        currentTarget?.parentNode?.removeEventListener('mouseout', () => {\n          currentTarget.classList.remove('forced-closed');\n        });\n      }\n    };\n    menuItemHover.addEventListener('click', toggleForcedOpen);\n  });\n\n  // ensure desktop submenus are closed when esc is pressed\n  const headerItems = document.querySelectorAll('.Header-menuItem');\n  headerItems.forEach(header => {\n    header.addEventListener('keyup', e => {\n      const event = e as KeyboardEvent;\n      if (event.key === 'Escape') {\n        (event.target as HTMLElement)?.blur();\n      }\n    });\n  });\n\n  // Mobile menu subnav menus\n  const headerbuttons = document.querySelectorAll('.js-headerMenuButton');\n  headerbuttons.forEach(button => {\n    button.addEventListener('click', e => {\n      e.preventDefault();\n      const isActive = header?.classList.contains('is-active');\n      if (isActive) {\n        handleNavigationDrawerInactive(header);\n      } else {\n        handleNavigationDrawerActive(header);\n      }\n      button.setAttribute('aria-expanded', isActive ? 'true' : 'false');\n    });\n  });\n\n  const scrim = document.querySelector('.js-scrim');\n  scrim?.addEventListener('click', e => {\n    e.preventDefault();\n\n    // find any active submenus and close them\n    const activeSubnavs = document.querySelectorAll('.go-NavigationDrawer-submenuItem.is-active');\n    activeSubnavs.forEach(subnav => handleNavigationDrawerInactive(subnav as HTMLElement));\n\n    handleNavigationDrawerInactive(header);\n\n    headerbuttons.forEach(button => {\n      button.setAttribute(\n        'aria-expanded',\n        header?.classList.contains('is-active') ? 'true' : 'false'\n      );\n    });\n  });\n\n  const getNavigationDrawerMenuItems = (navigationDrawer: HTMLElement): HTMLElement[] => {\n    if (!navigationDrawer) {\n      return [];\n    }\n\n    const menuItems = Array.from(\n      navigationDrawer.querySelectorAll(\n        ':scope > .go-NavigationDrawer-nav > .go-NavigationDrawer-list > .go-NavigationDrawer-listItem > a, :scope > .go-NavigationDrawer-nav > .go-NavigationDrawer-list > .go-NavigationDrawer-listItem > .go-Header-socialIcons > a'\n      ) || []\n    );\n\n    const anchorEl = navigationDrawer.querySelector('.go-NavigationDrawer-header > a');\n    if (anchorEl) {\n      menuItems.unshift(anchorEl);\n    }\n    return menuItems as HTMLElement[];\n  };\n\n  const getNavigationDrawerIsSubnav = (navigationDrawer: HTMLElement) => {\n    if (!navigationDrawer) {\n      return;\n    }\n    return navigationDrawer.classList.contains('go-NavigationDrawer-submenuItem');\n  };\n\n  const handleNavigationDrawerInactive = (navigationDrawer: HTMLElement) => {\n    if (!navigationDrawer) {\n      return;\n    }\n    const menuItems = getNavigationDrawerMenuItems(navigationDrawer);\n    navigationDrawer.classList.remove('is-active');\n    const parentMenuItem = navigationDrawer\n      .closest('.go-NavigationDrawer-listItem')\n      ?.querySelector(':scope > a') as HTMLElement;\n    parentMenuItem?.focus();\n    menuItems?.forEach(item => item?.setAttribute('tabindex', '-1'));\n    if (menuItems && menuItems[0]) {\n      menuItems[0].removeEventListener('keydown', handleMenuItemTabLeftFactory(navigationDrawer));\n      menuItems[menuItems.length - 1].removeEventListener(\n        'keydown',\n        handleMenuItemTabRightFactory(navigationDrawer)\n      );\n    }\n\n    if (navigationDrawer === header) {\n      headerbuttons && (headerbuttons[0] as HTMLElement)?.focus();\n    }\n  };\n\n  const handleNavigationDrawerActive = (navigationDrawer: HTMLElement) => {\n    const menuItems = getNavigationDrawerMenuItems(navigationDrawer);\n\n    navigationDrawer.classList.add('is-active');\n    menuItems.forEach(item => item.setAttribute('tabindex', '0'));\n    menuItems[0].focus();\n\n    menuItems[0].addEventListener('keydown', handleMenuItemTabLeftFactory(navigationDrawer));\n    menuItems[menuItems.length - 1].addEventListener(\n      'keydown',\n      handleMenuItemTabRightFactory(navigationDrawer)\n    );\n  };\n\n  const handleMenuItemTabLeftFactory = (navigationDrawer: HTMLElement) => {\n    return (e: KeyboardEvent) => {\n      if (e.key === 'Tab' && e.shiftKey) {\n        e.preventDefault();\n        handleNavigationDrawerInactive(navigationDrawer);\n      }\n    };\n  };\n\n  const handleMenuItemTabRightFactory = (navigationDrawer: HTMLElement) => {\n    return (e: KeyboardEvent) => {\n      if (e.key === 'Tab' && !e.shiftKey) {\n        e.preventDefault();\n        handleNavigationDrawerInactive(navigationDrawer);\n      }\n    };\n  };\n\n  const prepMobileNavigationDrawer = (navigationDrawer: HTMLElement) => {\n    const isSubnav = getNavigationDrawerIsSubnav(navigationDrawer);\n    const menuItems = getNavigationDrawerMenuItems(navigationDrawer);\n    navigationDrawer.addEventListener('keyup', e => {\n      if (e.key === 'Escape') {\n        handleNavigationDrawerInactive(navigationDrawer);\n      }\n    });\n\n    menuItems.forEach(item => {\n      const parentLi = item.closest('li');\n      if (parentLi && parentLi.classList.contains('js-mobile-subnav-trigger')) {\n        const submenu = parentLi.querySelector('.go-NavigationDrawer-submenuItem') as HTMLElement;\n        item.addEventListener('click', () => {\n          handleNavigationDrawerActive(submenu);\n        });\n      }\n    });\n    if (isSubnav) {\n      handleNavigationDrawerInactive(navigationDrawer);\n      navigationDrawer\n        ?.querySelector('.go-NavigationDrawer-header')\n        ?.addEventListener('click', e => {\n          e.preventDefault();\n          handleNavigationDrawerInactive(navigationDrawer);\n        });\n    }\n  };\n\n  document\n    .querySelectorAll('.go-NavigationDrawer')\n    .forEach(drawer => prepMobileNavigationDrawer(drawer as HTMLElement));\n\n  handleNavigationDrawerInactive(header);\n}\n\nexport function registerSearchFormListeners(): void {\n  const searchForm = document.querySelector('.js-searchForm');\n  const expandSearch = document.querySelector('.js-expandSearch');\n  const input = searchForm?.querySelector('input');\n  const headerLogo = document.querySelector('.js-headerLogo');\n  const menuButton = document.querySelector('.js-headerMenuButton');\n  expandSearch?.addEventListener('click', () => {\n    searchForm?.classList.add('go-SearchForm--expanded');\n    headerLogo?.classList.add('go-Header-logo--hidden');\n    menuButton?.classList.add('go-Header-navOpen--hidden');\n    input?.focus();\n  });\n  document?.addEventListener('click', e => {\n    if (!searchForm?.contains(e.target as Node)) {\n      searchForm?.classList.remove('go-SearchForm--expanded');\n      headerLogo?.classList.remove('go-Header-logo--hidden');\n      menuButton?.classList.remove('go-Header-navOpen--hidden');\n    }\n  });\n}\n", "/**\n * @license\n * Copyright 2021 The Go Authors. All rights reserved.\n * Use of this source code is governed by a BSD-style\n * license that can be found in the LICENSE file.\n */\n\n/**\n * Carousel Controller adds event listeners, accessibility enhancements, and\n * control elements to a carousel component.\n */\nexport class CarouselController {\n  /**\n   * slides is a collection of slides in the carousel.\n   */\n  private slides: HTMLLIElement[];\n  /**\n   * dots is a collection of dot navigation controls, added to the carousel\n   * by this controller.\n   */\n  private dots: HTMLElement[];\n  /**\n   * liveRegion is a visually hidden element that notifies assitive devices\n   * of visual changes to the carousel. They are added to the carousel by\n   * this controller.\n   */\n  private liveRegion: HTMLElement;\n  /**\n   * activeIndex is the 0-index of the currently active slide.\n   */\n  private activeIndex: number;\n\n  constructor(private el: HTMLElement) {\n    this.slides = Array.from(el.querySelectorAll('.go-Carousel-slide'));\n    this.dots = [];\n    this.liveRegion = document.createElement('div');\n    this.activeIndex = Number(el.getAttribute('data-slide-index') ?? 0);\n\n    this.initSlides();\n    this.initArrows();\n    this.initDots();\n    this.initLiveRegion();\n  }\n\n  private initSlides() {\n    for (const [i, v] of this.slides.entries()) {\n      if (i === this.activeIndex) continue;\n      v.setAttribute('aria-hidden', 'true');\n    }\n  }\n\n  private initArrows() {\n    const arrows = document.createElement('ul');\n    arrows.classList.add('go-Carousel-arrows');\n    arrows.innerHTML = `\n      <li>\n        <button class=\"go-Carousel-prevSlide\" aria-label=\"Go to previous slide\">\n          <img class=\"go-Icon\" height=\"24\" width=\"24\" src=\"/static/shared/icon/arrow_left_gm_grey_24dp.svg\" alt=\"\">\n        </button>\n      </li>\n      <li>\n        <button class=\"go-Carousel-nextSlide\" aria-label=\"Go to next slide\">\n          <img class=\"go-Icon\" height=\"24\" width=\"24\" src=\"/static/shared/icon/arrow_right_gm_grey_24dp.svg\" alt=\"\">\n        </button>\n      </li>\n    `;\n    arrows\n      .querySelector('.go-Carousel-prevSlide')\n      ?.addEventListener('click', () => this.setActive(this.activeIndex - 1));\n    arrows\n      .querySelector('.go-Carousel-nextSlide')\n      ?.addEventListener('click', () => this.setActive(this.activeIndex + 1));\n    this.el.append(arrows);\n  }\n\n  private initDots() {\n    const dots = document.createElement('ul');\n    dots.classList.add('go-Carousel-dots');\n    for (let i = 0; i < this.slides.length; i++) {\n      const li = document.createElement('li');\n      const button = document.createElement('button');\n      button.classList.add('go-Carousel-dot');\n      if (i === this.activeIndex) {\n        button.classList.add('go-Carousel-dot--active');\n      }\n      button.innerHTML = `<span class=\"go-Carousel-obscured\">Slide ${i + 1}</span>`;\n      button.addEventListener('click', () => this.setActive(i));\n      li.append(button);\n      dots.append(li);\n      this.dots.push(button);\n    }\n    this.el.append(dots);\n  }\n\n  private initLiveRegion() {\n    this.liveRegion.setAttribute('aria-live', 'polite');\n    this.liveRegion.setAttribute('aria-atomic', 'true');\n    this.liveRegion.setAttribute('class', 'go-Carousel-obscured');\n    this.liveRegion.textContent = `Slide ${this.activeIndex + 1} of ${this.slides.length}`;\n    this.el.appendChild(this.liveRegion);\n  }\n\n  private setActive = (index: number) => {\n    this.activeIndex = (index + this.slides.length) % this.slides.length;\n    this.el.setAttribute('data-slide-index', String(this.activeIndex));\n    for (const d of this.dots) {\n      d.classList.remove('go-Carousel-dot--active');\n    }\n    this.dots[this.activeIndex].classList.add('go-Carousel-dot--active');\n    for (const s of this.slides) {\n      s.setAttribute('aria-hidden', 'true');\n    }\n    this.slides[this.activeIndex].removeAttribute('aria-hidden');\n    this.liveRegion.textContent = 'Slide ' + (this.activeIndex + 1) + ' of ' + this.slides.length;\n  };\n}\n", "/**\n * @license\n * Copyright 2021 The Go Authors. All rights reserved.\n * Use of this source code is governed by a BSD-style\n * license that can be found in the LICENSE file.\n */\n\n/**\n * This class decorates an element to copy arbitrary data attached via a data-\n * attribute to the clipboard.\n */\nexport class ClipboardController {\n  /**\n   * The data to be copied to the clipboard.\n   */\n  private data: string;\n\n  /**\n   * @param el The element that will trigger copying text to the clipboard. The text is\n   * expected to be within its data-to-copy attribute.\n   */\n  constructor(private el: HTMLButtonElement) {\n    this.data = el.dataset['toCopy'] ?? el.innerText;\n    // if data-to-copy is empty and the button is part of an input group\n    // capture the value of the input.\n    if (!this.data && el.parentElement?.classList.contains('go-InputGroup')) {\n      this.data = (this.data || el.parentElement?.querySelector('input')?.value) ?? '';\n    }\n    el.addEventListener('click', e => this.handleCopyClick(e));\n  }\n\n  /**\n   * Handles when the primary element is clicked.\n   */\n  handleCopyClick(e: MouseEvent): void {\n    e.preventDefault();\n    const TOOLTIP_SHOW_DURATION_MS = 1000;\n\n    // This API is not available on iOS.\n    if (!navigator.clipboard) {\n      this.showTooltipText('Unable to copy', TOOLTIP_SHOW_DURATION_MS);\n      return;\n    }\n    navigator.clipboard\n      .writeText(this.data)\n      .then(() => {\n        this.showTooltipText('Copied!', TOOLTIP_SHOW_DURATION_MS);\n      })\n      .catch(() => {\n        this.showTooltipText('Unable to copy', TOOLTIP_SHOW_DURATION_MS);\n      });\n  }\n\n  /**\n   * Shows the given text in a tooltip for a specified amount of time, in milliseconds.\n   */\n  showTooltipText(text: string, durationMs: number): void {\n    this.el.setAttribute('data-tooltip', text);\n    setTimeout(() => this.el.setAttribute('data-tooltip', ''), durationMs);\n  }\n}\n", "/**\n * @license\n * Copyright 2021 The Go Authors. All rights reserved.\n * Use of this source code is governed by a BSD-style\n * license that can be found in the LICENSE file.\n */\n\n/**\n * ToolTipController handles closing tooltips on external clicks.\n */\nexport class ToolTipController {\n  constructor(private el: HTMLDetailsElement) {\n    document.addEventListener('click', e => {\n      const insideTooltip = this.el.contains(e.target as Element);\n      if (!insideTooltip) {\n        this.el.removeAttribute('open');\n      }\n    });\n  }\n}\n", "/**\n * @license\n * Copyright 2021 The Go Authors. All rights reserved.\n * Use of this source code is governed by a BSD-style\n * license that can be found in the LICENSE file.\n */\n\nimport { TreeNavController } from './tree.js';\n\nexport class SelectNavController {\n  constructor(private el: Element) {\n    this.el.addEventListener('change', e => {\n      const target = e.target as HTMLSelectElement;\n      let href = target.value;\n      if (!target.value.startsWith('/')) {\n        href = '/' + href;\n      }\n      window.location.href = href;\n    });\n  }\n}\n\nexport function makeSelectNav(tree: TreeNavController): HTMLLabelElement {\n  const label = document.createElement('label');\n  label.classList.add('go-Label');\n  label.setAttribute('aria-label', 'Menu');\n  const select = document.createElement('select');\n  select.classList.add('go-Select', 'js-selectNav');\n  label.appendChild(select);\n  const outline = document.createElement('optgroup');\n  outline.label = 'Outline';\n  select.appendChild(outline);\n  const groupMap: Record<string, HTMLOptGroupElement> = {};\n  let group: HTMLOptGroupElement;\n  for (const t of tree.treeitems) {\n    if (Number(t.depth) > 4) continue;\n    if (t.groupTreeitem) {\n      group = groupMap[t.groupTreeitem.label];\n      if (!group) {\n        group = groupMap[t.groupTreeitem.label] = document.createElement('optgroup');\n        group.label = t.groupTreeitem.label;\n        select.appendChild(group);\n      }\n    } else {\n      group = outline;\n    }\n    const o = document.createElement('option');\n    o.label = t.label;\n    o.textContent = t.label;\n    o.value = (t.el as HTMLAnchorElement).href.replace(window.location.origin, '').replace('/', '');\n    group.appendChild(o);\n  }\n  tree.addObserver(t => {\n    const hash = (t.el as HTMLAnchorElement).hash;\n    const value = select.querySelector<HTMLOptionElement>(`[value$=\"${hash}\"]`)?.value;\n    if (value) {\n      select.value = value;\n    }\n  }, 50);\n  return label;\n}\n", "/**\n * @license\n * Copyright 2021 The Go Authors. All rights reserved.\n * Use of this source code is governed by a BSD-style\n * license that can be found in the LICENSE file.\n */\n\ninterface Window {\n  dialogPolyfill?: {\n    registerDialog: (el: HTMLDialogElement) => void;\n  };\n}\n\ndeclare const window: Window;\n\n/**\n * ModalController registers a dialog element with the polyfill if\n * necessary for the current browser, add adds event listeners to\n * close and open modals.\n */\nexport class ModalController {\n  constructor(private el: HTMLDialogElement) {\n    if (window.dialogPolyfill) {\n      window.dialogPolyfill.registerDialog(el);\n    }\n    this.init();\n  }\n\n  init() {\n    const button = document.querySelector<HTMLButtonElement>(`[aria-controls=\"${this.el.id}\"]`);\n    if (button) {\n      button.addEventListener('click', () => {\n        if (this.el.showModal) {\n          this.el.showModal();\n        } else {\n          this.el.setAttribute('opened', 'true');\n        }\n        this.el.querySelector('input')?.focus();\n      });\n    }\n    for (const btn of this.el.querySelectorAll<HTMLButtonElement>('[data-modal-close]')) {\n      btn.addEventListener('click', () => {\n        if (this.el.close) {\n          this.el.close();\n        } else {\n          this.el.removeAttribute('opened');\n        }\n      });\n    }\n  }\n}\n", "interface TagManagerEvent {\n  /**\n   * event is the name of the event, used to filter events in\n   * Google Analytics.\n   */\n  event: string;\n\n  /**\n   * event_category is a name that you supply as a way to group objects\n   * that to analyze. Typically, you will use the same category name\n   * multiple times over related UI elements (buttons, links, etc).\n   */\n  event_category?: string;\n\n  /**\n   * event_action is used to name the type of event or interaction you\n   * want to measure for a particular web object. For example, with a\n   * single \"form\" category, you can analyze a number of specific events\n   * with this parameter, such as: form entered, form submitted.\n   */\n  event_action?: string;\n\n  /**\n   * event_label provide additional information for events that you want\n   * to analyze, such as the text label of a link.\n   */\n  event_label?: string;\n\n  /**\n   * gtm.start is used to initialize Google Tag Manager.\n   */\n  'gtm.start'?: number;\n}\n\n// eslint-disable-next-line @typescript-eslint/no-unused-vars\ndeclare global {\n  interface Window {\n    dataLayer?: (TagManagerEvent | VoidFunction)[];\n    ga?: unknown;\n  }\n}\n\n/**\n * track sends events to Google Tag Manager.\n */\nexport function track(\n  event: string | TagManagerEvent,\n  category?: string,\n  action?: string,\n  label?: string\n): void {\n  window.dataLayer ??= [];\n  if (typeof event === 'string') {\n    window.dataLayer.push({\n      event,\n      event_category: category,\n      event_action: action,\n      event_label: label,\n    });\n  } else {\n    window.dataLayer.push(event);\n  }\n}\n\n/**\n * func adds functions to run sequentionally after\n * Google Tag Manager is ready.\n */\nexport function func(fn: () => void): void {\n  window.dataLayer ??= [];\n  window.dataLayer.push(fn);\n}\n", "/*!\n * @license\n * Copyright 2019-2020 The Go Authors. All rights reserved.\n * Use of this source code is governed by a BSD-style\n * license that can be found in the LICENSE file.\n */\n\nimport { track } from '../analytics/analytics';\n\n/**\n * Options are keyhandler callback options.\n */\ninterface Options {\n  /**\n   * target is the element the key event should filter on. The\n   * default target is the document.\n   */\n  target?: Element;\n\n  /**\n   * withMeta specifies if the event callback should fire when\n   * the key is pressed with a meta key (ctrl, alt, etc). By\n   * default meta keypresses are ignored.\n   */\n  withMeta?: boolean;\n}\n\n/**\n * KeyHandler is the config for a keyboard event callback.\n */\ninterface KeyHandler extends Options {\n  description: string;\n  callback: (e: KeyboardEvent) => void;\n}\n\n/**\n * KeyboardController controls event callbacks for sitewide\n * keyboard events. Multiple callbacks can be registered for\n * a single key and by default the controller ignores events\n * for text input targets.\n */\nclass KeyboardController {\n  handlers: Record<string, Set<KeyHandler>>;\n\n  constructor() {\n    this.handlers = {};\n    document.addEventListener('keydown', e => this.handleKeyPress(e));\n  }\n\n  /**\n   * on registers keyboard event callbacks.\n   * @param key the key to register.\n   * @param description name of the event.\n   * @param callback event callback.\n   * @param options set target and withMeta options to override the default behaviors.\n   */\n  on(key: string, description: string, callback: (e: KeyboardEvent) => void, options?: Options) {\n    this.handlers[key] ??= new Set();\n    this.handlers[key].add({ description, callback, ...options });\n    return this;\n  }\n\n  private handleKeyPress(e: KeyboardEvent) {\n    for (const handler of this.handlers[e.key.toLowerCase()] ?? new Set()) {\n      if (handler.target && handler.target !== e.target) {\n        return;\n      }\n      const t = e.target as HTMLElement | null;\n      if (\n        !handler.target &&\n        (t?.tagName === 'INPUT' || t?.tagName === 'SELECT' || t?.tagName === 'TEXTAREA')\n      ) {\n        return;\n      }\n      if (t?.isContentEditable) {\n        return;\n      }\n      if (\n        (handler.withMeta && !(e.ctrlKey || e.metaKey)) ||\n        (!handler.withMeta && (e.ctrlKey || e.metaKey))\n      ) {\n        return;\n      }\n      track('keypress', 'hotkeys', `${e.key} pressed`, handler.description);\n      handler.callback(e);\n    }\n  }\n}\n\nexport const keyboard = new KeyboardController();\n", "/*!\n * @license\n * Copyright 2019-2020 The Go Authors. All rights reserved.\n * Use of this source code is governed by a BSD-style\n * license that can be found in the LICENSE file.\n */\n\n// This file implements the behavior of the \"jump to symbol\" dialog for Go\n// package documentation, as well as the simple dialog that displays keyboard\n// shortcuts.\n\n// The DOM for the dialogs is at the bottom of static/frontend/unit/main/_modals.tmpl.\n// The CSS is in static/frontend/unit/main/_modals.css.\n\n// The dialog is activated by pressing the 'f' key. It presents a list\n// (#JumpDialog-list) of all Go symbols displayed in the documentation.\n// Entering text in the dialog's text box (#JumpDialog-filter) restricts the\n// list to symbols containing the text. Clicking on an symbol jumps to\n// its documentation.\n\n// This code is based on\n// https://go.googlesource.com/gddo/+/refs/heads/master/gddo-server/assets/site.js.\n// It was modified to remove the dependence on jquery and bootstrap.\n\nimport { keyboard } from '../keyboard/keyboard';\n\nexport function initModals(): void {\n  const jumpDialog = document.querySelector<HTMLDialogElement>('.JumpDialog');\n  const jumpBody = jumpDialog?.querySelector<HTMLDivElement>('.JumpDialog-body');\n  const jumpList = jumpDialog?.querySelector<HTMLDivElement>('.JumpDialog-list');\n  const jumpFilter = jumpDialog?.querySelector<HTMLInputElement>('.JumpDialog-input');\n  const doc = document.querySelector<HTMLDivElement>('.js-documentation');\n\n  interface JumpListItem {\n    link: HTMLAnchorElement;\n    name: string;\n    kind: string;\n    lower: string;\n  }\n\n  let jumpListItems: JumpListItem[] | undefined; // All the symbols in the doc; computed only once.\n\n  // collectJumpListItems returns a list of items, one for each symbol in the\n  // documentation on the current page.\n  //\n  // It uses the data-kind attribute generated in the documentation HTML to find\n  // the symbols and their id attributes.\n  //\n  // If there are no data-kind attributes, then we have older doc; fall back to\n  // a less precise method.\n  function collectJumpListItems() {\n    const items = [];\n    if (!doc) return;\n    for (const el of doc.querySelectorAll('[data-kind]')) {\n      items.push(newJumpListItem(el));\n    }\n\n    // Clicking on any of the links closes the dialog.\n    for (const item of items) {\n      item.link.addEventListener('click', function () {\n        jumpDialog?.close();\n      });\n    }\n    // Sort case-insensitively by symbol name.\n    items.sort(function (a, b) {\n      return a.lower.localeCompare(b.lower);\n    });\n    return items;\n  }\n\n  // newJumpListItem creates a new item for the DOM element el.\n  // An item is an object with:\n  // - name: the element's id (which is the symbol name)\n  // - kind: the element's kind (function, variable, etc.),\n  // - link: a link ('a' tag) to the element\n  // - lower: the name in lower case, just for sorting\n  function newJumpListItem(el: Element): JumpListItem {\n    const a = document.createElement('a');\n    const name = el.getAttribute('id');\n    a.setAttribute('href', '#' + name);\n    a.setAttribute('tabindex', '-1');\n    a.setAttribute('data-gtmc', 'jump to link');\n    const kind = el.getAttribute('data-kind');\n    return {\n      link: a,\n      name: name ?? '',\n      kind: kind ?? '',\n      lower: name?.toLowerCase() ?? '', // for sorting\n    };\n  }\n\n  let lastFilterValue: string; // The last contents of the filter text box.\n  let activeJumpItem = -1; // The index of the currently active item in the list.\n\n  // updateJumpList sets the elements of the dialog list to\n  // everything whose name contains filter.\n  function updateJumpList(filter: string) {\n    lastFilterValue = filter;\n    if (!jumpListItems) {\n      jumpListItems = collectJumpListItems();\n    }\n    setActiveJumpItem(-1);\n\n    // Remove all children from list.\n    while (jumpList?.firstChild) {\n      jumpList.firstChild.remove();\n    }\n\n    if (filter) {\n      // A filter is set. We treat the filter as a substring that can appear in\n      // an item name (case insensitive), and find the following matches - in\n      // order of priority:\n      //\n      // 1. Exact matches (the filter matches the item's name exactly)\n      // 2. Prefix matches (the item's name starts with filter)\n      // 3. Infix matches (the filter is a substring of the item's name)\n      const filterLowerCase = filter.toLowerCase();\n\n      const exactMatches = [];\n      const prefixMatches = [];\n      const infixMatches = [];\n\n      // makeLinkHtml creates the link name HTML for a list item. item is the DOM\n      // item. item.name.substr(boldStart, boldEnd) will be bolded.\n      const makeLinkHtml = (item: JumpListItem, boldStart: number, boldEnd: number) => {\n        return (\n          item.name.substring(0, boldStart) +\n          '<b>' +\n          item.name.substring(boldStart, boldEnd) +\n          '</b>' +\n          item.name.substring(boldEnd)\n        );\n      };\n\n      for (const item of jumpListItems ?? []) {\n        const nameLowerCase = item.name.toLowerCase();\n\n        if (nameLowerCase === filterLowerCase) {\n          item.link.innerHTML = makeLinkHtml(item, 0, item.name.length);\n          exactMatches.push(item);\n        } else if (nameLowerCase.startsWith(filterLowerCase)) {\n          item.link.innerHTML = makeLinkHtml(item, 0, filter.length);\n          prefixMatches.push(item);\n        } else {\n          const index = nameLowerCase.indexOf(filterLowerCase);\n          if (index > -1) {\n            item.link.innerHTML = makeLinkHtml(item, index, index + filter.length);\n            infixMatches.push(item);\n          }\n        }\n      }\n\n      for (const item of exactMatches.concat(prefixMatches).concat(infixMatches)) {\n        jumpList?.appendChild(item.link);\n      }\n    } else {\n      if (!jumpListItems || jumpListItems.length === 0) {\n        const msg = document.createElement('i');\n        msg.innerHTML = 'There are no symbols on this page.';\n        jumpList?.appendChild(msg);\n      }\n      // No filter set; display all items in their existing order.\n      for (const item of jumpListItems ?? []) {\n        item.link.innerHTML = item.name + ' <i>' + item.kind + '</i>';\n        jumpList?.appendChild(item.link);\n      }\n    }\n\n    if (jumpBody) {\n      jumpBody.scrollTop = 0;\n    }\n    if (jumpListItems?.length && jumpList && jumpList.children.length > 0) {\n      setActiveJumpItem(0);\n    }\n  }\n\n  // Set the active jump item to n.\n  function setActiveJumpItem(n: number) {\n    const cs = jumpList?.children as HTMLCollectionOf<HTMLElement> | null | undefined;\n    if (!cs || !jumpBody) {\n      return;\n    }\n    if (activeJumpItem >= 0) {\n      cs[activeJumpItem].classList.remove('JumpDialog-active');\n    }\n    if (n >= cs.length) {\n      n = cs.length - 1;\n    }\n    if (n >= 0) {\n      cs[n].classList.add('JumpDialog-active');\n\n      // Scroll so the active item is visible.\n      // For some reason cs[n].scrollIntoView() doesn't behave as I'd expect:\n      // it moves the entire dialog box in the viewport.\n\n      // Get the top and bottom of the active item relative to jumpBody.\n      const activeTop = cs[n].offsetTop - cs[0].offsetTop;\n      const activeBottom = activeTop + cs[n].clientHeight;\n      if (activeTop < jumpBody.scrollTop) {\n        // Off the top; scroll up.\n        jumpBody.scrollTop = activeTop;\n      } else if (activeBottom > jumpBody.scrollTop + jumpBody.clientHeight) {\n        // Off the bottom; scroll down.\n        jumpBody.scrollTop = activeBottom - jumpBody.clientHeight;\n      }\n    }\n    activeJumpItem = n;\n  }\n\n  // Increment the activeJumpItem by delta.\n  function incActiveJumpItem(delta: number) {\n    if (activeJumpItem < 0) {\n      return;\n    }\n    let n = activeJumpItem + delta;\n    if (n < 0) {\n      n = 0;\n    }\n    setActiveJumpItem(n);\n  }\n\n  // Pressing a key in the filter updates the list (if the filter actually changed).\n  jumpFilter?.addEventListener('keyup', function () {\n    if (jumpFilter.value.toUpperCase() != lastFilterValue.toUpperCase()) {\n      updateJumpList(jumpFilter.value);\n    }\n  });\n\n  // Pressing enter in the filter selects the first element in the list.\n  jumpFilter?.addEventListener('keydown', function (event) {\n    const upArrow = 38;\n    const downArrow = 40;\n    const enterKey = 13;\n    switch (event.which) {\n      case upArrow:\n        incActiveJumpItem(-1);\n        event.preventDefault();\n        break;\n      case downArrow:\n        incActiveJumpItem(1);\n        event.preventDefault();\n        break;\n      case enterKey:\n        if (activeJumpItem >= 0) {\n          if (jumpList) {\n            (jumpList.children[activeJumpItem] as HTMLElement).click();\n            event.preventDefault();\n          }\n        }\n        break;\n    }\n  });\n\n  const shortcutsDialog = document.querySelector<HTMLDialogElement>('.ShortcutsDialog');\n\n  // - Pressing 'f' or 'F' opens the jump-to-symbol dialog.\n  // - Pressing '?' opens up the shortcut dialog.\n  // Ignore a keypress if a dialog is already open, or if it is pressed on a\n  // component that wants to consume it.\n  keyboard\n    .on('f', 'open jump to modal', e => {\n      if (jumpDialog?.open || shortcutsDialog?.open) {\n        return;\n      }\n      e.preventDefault();\n      if (jumpFilter) {\n        jumpFilter.value = '';\n      }\n      jumpDialog?.showModal?.();\n      jumpFilter?.focus();\n      updateJumpList('');\n    })\n    .on('?', 'open shortcuts modal', () => {\n      if (jumpDialog?.open || shortcutsDialog?.open) {\n        return;\n      }\n      shortcutsDialog?.showModal?.();\n    });\n\n  const jumpOutlineInput = document.querySelector('.js-jumpToInput');\n  if (jumpOutlineInput) {\n    jumpOutlineInput.addEventListener('click', () => {\n      if (jumpFilter) {\n        jumpFilter.value = '';\n      }\n      updateJumpList('');\n      if (jumpDialog?.open || shortcutsDialog?.open) {\n        return;\n      }\n      jumpDialog?.showModal?.();\n      jumpFilter?.focus();\n    });\n  }\n\n  document.querySelector('.js-openShortcuts')?.addEventListener('click', () => {\n    shortcutsDialog?.showModal?.();\n  });\n}\n", "/**\n * @license\n * Copyright 2022 The Go Authors. All rights reserved.\n * Use of this source code is governed by a BSD-style\n * license that can be found in the LICENSE file.\n */\n\n/**\n * Left Navigation.\n */\nexport const initJumpLinks = async function () {\n  const pagesWithJumpLinks = ['/about'];\n  if (!pagesWithJumpLinks.includes(window.location.pathname)) {\n    // stop the file from doing anything else if the page doesn't have jumplinks\n    return;\n  }\n\n  // these might be generated or not so don't grab references to the elements until actually need them.\n  const titles = 'h2, h3, h4';\n  const nav = '.LeftNav a';\n  // these are always in the dom so we can get them now and throw errors if they're not.\n  const leftNav = document.querySelector('.LeftNav');\n  const siteContent = document.querySelector('.go-Content');\n  let isObserverDisabled = false;\n\n  /**\n   * El function\n   * @example el('h1', {className: 'title'}, 'Welcome to the site');\n   * @example el('ul', {className: 'list'}, el('li', {}, 'Item one'), el('li', {}, 'Item two'), el('li', {}, 'Item three'));\n   * @example el('img', {src: '/url.svg'});\n   */\n  function el(\n    type = '',\n    props: { [key: string]: string } = {},\n    ...children: (HTMLElement | HTMLElement[] | string | undefined)[]\n  ) {\n    // Error, no type declared.\n    if (!type) {\n      throw new Error('Provide `type` to create document element.');\n    }\n\n    // Create element with optional attribute props\n    const docEl = Object.assign(document.createElement(type), props);\n\n    // Children: array containing strings or elements\n    children.forEach(child => {\n      if (typeof child === 'string') {\n        docEl.appendChild(document.createTextNode(child));\n      } else if (Array.isArray(child)) {\n        child.forEach(c => docEl.appendChild(c));\n      } else if (child instanceof HTMLElement) {\n        docEl.appendChild(child);\n      }\n    });\n\n    return docEl;\n  }\n  /**  Build Nav if data hydrate is present. */\n  function buildNav() {\n    return new Promise((resolve, reject) => {\n      let navItems: { id: string; label: string; subnav?: { id: string; label: string }[] }[] = [];\n      let elements: HTMLElement[] = [];\n\n      if (!siteContent || !leftNav) {\n        return reject('.SiteContent not found.');\n      }\n      if (leftNav instanceof HTMLElement && !leftNav?.dataset?.hydrate) {\n        return resolve(true);\n      }\n\n      for (const title of siteContent.querySelectorAll(titles)) {\n        if (title instanceof HTMLElement && !title?.dataset?.ignore) {\n          switch (title.tagName) {\n            case 'H2':\n              navItems = [\n                ...navItems,\n                {\n                  id: title.id,\n                  label: title?.dataset?.title ? title.dataset.title : title.textContent ?? '',\n                },\n              ];\n              break;\n\n            case 'H3':\n            case 'H4':\n              if (!navItems[navItems.length - 1]?.subnav) {\n                navItems[navItems.length - 1].subnav = [\n                  {\n                    id: title.id,\n                    label: title?.dataset?.title ? title.dataset.title : title.textContent ?? '',\n                  },\n                ];\n              } else if (navItems[navItems.length - 1].subnav) {\n                navItems[navItems.length - 1].subnav?.push({\n                  id: title.id,\n                  label: title?.dataset?.title ? title.dataset.title : title.textContent ?? '',\n                });\n              }\n              break;\n          }\n        }\n      }\n\n      for (const navItem of navItems) {\n        const link = el('a', { href: '#' + navItem.id }, el('span', {}, navItem.label));\n        elements = [...elements, link];\n        if (navItem?.subnav) {\n          let subLinks: HTMLElement[] = [];\n          for (const subnavItem of navItem.subnav) {\n            const subItem = el(\n              'li',\n              {},\n              el(\n                'a',\n                { href: '#' + subnavItem.id },\n                el('img', { src: '/static/frontend/about/dot.svg', width: '5', height: '5' }),\n                el('span', {}, subnavItem.label)\n              )\n            );\n            subLinks = [...subLinks, subItem];\n          }\n          const list = el('ul', { className: 'LeftSubnav' }, subLinks);\n          elements = [...elements, list];\n        }\n      }\n\n      elements.forEach(element => leftNav.appendChild(element));\n\n      return resolve(true);\n    });\n  }\n  /**\n   * Set the correct active element.\n   */\n  function setNav() {\n    return new Promise(resolve => {\n      if (!document.querySelectorAll(nav)) return resolve(true);\n      for (const a of document.querySelectorAll(nav)) {\n        if (a instanceof HTMLAnchorElement && a.href === location.href) {\n          setElementActive(a);\n          break;\n        }\n      }\n      resolve(true);\n    });\n  }\n  /** resetNav: removes all .active from nav elements */\n  function resetNav() {\n    return new Promise(resolve => {\n      if (!document.querySelectorAll(nav)) return resolve(true);\n      for (const a of document.querySelectorAll(nav)) {\n        a.classList.remove('active');\n      }\n      resolve(true);\n    });\n  }\n  /** setElementActive: controls resetting nav and highlighting the appropriate nav items */\n  function setElementActive(element: HTMLAnchorElement) {\n    if (element instanceof HTMLAnchorElement) {\n      resetNav().then(() => {\n        element.classList.add('active');\n        const parent = element?.parentNode?.parentNode;\n        if (parent instanceof HTMLElement && parent?.classList?.contains('LeftSubnav')) {\n          parent.previousElementSibling?.classList.add('active');\n        }\n      });\n    }\n  }\n  /** setLinkManually: disables observer and selects the clicked nav item. */\n  function setLinkManually() {\n    delayObserver();\n    const link = document.querySelector('[href=\"' + location.hash + '\"]');\n    if (link instanceof HTMLAnchorElement) {\n      setElementActive(link);\n    }\n  }\n  /** delayObserver: Quick on off switch for intersection observer. */\n  function delayObserver() {\n    isObserverDisabled = true;\n    setTimeout(() => {\n      isObserverDisabled = false;\n    }, 200);\n  }\n  /** observeSections: kicks off observation of titles as well as manual clicks with hashchange */\n  function observeSections() {\n    window.addEventListener('hashchange', setLinkManually);\n\n    if (siteContent?.querySelectorAll(titles)) {\n      const callback: IntersectionObserverCallback = entries => {\n        if (!isObserverDisabled && Array.isArray(entries) && entries.length > 0) {\n          for (const entry of entries) {\n            if (entry.isIntersecting && entry.target instanceof HTMLElement) {\n              const { id } = entry.target;\n              const link = document.querySelector('[href=\"#' + id + '\"]');\n              if (link instanceof HTMLAnchorElement) {\n                setElementActive(link);\n              }\n              break;\n            }\n          }\n        }\n      };\n      // rootMargin is important when multiple sections are in the observable area **on page load**.\n      // they will still be highlighted on scroll because of the root margin.\n      const ob = new IntersectionObserver(callback, {\n        threshold: 0,\n        rootMargin: '0px 0px -50% 0px',\n      });\n      for (const title of siteContent.querySelectorAll(titles)) {\n        if (title instanceof HTMLElement && !title?.dataset?.ignore) {\n          ob.observe(title);\n        }\n      }\n    }\n  }\n\n  try {\n    await buildNav();\n    await setNav();\n    if (location.hash) {\n      delayObserver();\n    }\n    observeSections();\n  } catch (e) {\n    if (e instanceof Error) {\n      console.error(e.message);\n    } else {\n      console.error(e);\n    }\n  }\n};\n", "/**\n * @license\n * Copyright 2020 The Go Authors. All rights reserved.\n * Use of this source code is governed by a BSD-style\n * license that can be found in the LICENSE file.\n */\n\nimport { registerHeaderListeners, registerSearchFormListeners } from 'static/shared/header/header';\nimport { CarouselController } from 'static/shared/carousel/carousel';\nimport { ClipboardController } from 'static/shared/clipboard/clipboard';\nimport { ToolTipController } from 'static/shared/tooltip/tooltip';\nimport { SelectNavController } from 'static/shared/outline/select';\nimport { ModalController } from 'static/shared/modal/modal';\nimport { initModals } from 'static/shared/jump/jump';\n\nimport { keyboard } from 'static/shared/keyboard/keyboard';\nimport * as analytics from 'static/shared/analytics/analytics';\nimport { initJumpLinks } from './about/index';\n\nwindow.addEventListener('load', () => {\n  for (const el of document.querySelectorAll<HTMLButtonElement>('.js-clipboard')) {\n    new ClipboardController(el);\n  }\n\n  for (const el of document.querySelectorAll<HTMLDialogElement>('.js-modal')) {\n    new ModalController(el);\n  }\n\n  for (const t of document.querySelectorAll<HTMLDetailsElement>('.js-tooltip')) {\n    new ToolTipController(t);\n  }\n\n  for (const el of document.querySelectorAll<HTMLSelectElement>('.js-selectNav')) {\n    new SelectNavController(el);\n  }\n\n  for (const el of document.querySelectorAll<HTMLSelectElement>('.js-carousel')) {\n    new CarouselController(el);\n  }\n\n  for (const el of document.querySelectorAll('.js-toggleTheme')) {\n    el.addEventListener('click', () => {\n      toggleTheme();\n    });\n  }\n\n  if (document.querySelector<HTMLElement>('.js-gtmID')?.dataset.gtmid && window.dataLayer) {\n    analytics.func(function () {\n      removeUTMSource();\n    });\n  } else {\n    removeUTMSource();\n  }\n\n  registerHeaderListeners();\n  registerSearchFormListeners();\n  initModals();\n  initJumpLinks();\n});\n\n// Pressing '/' focuses the search box\nkeyboard.on('/', 'focus search', e => {\n  const searchInput = Array.from(\n    document.querySelectorAll<HTMLInputElement>('.js-searchFocus')\n  ).pop();\n  // Favoring the Firefox quick find feature over search input\n  // focus. 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diff --git a/static/frontend/frontend.min.css b/static/frontend/frontend.min.css
index 421aa0b..5a40e77 100644
--- a/static/frontend/frontend.min.css
+++ b/static/frontend/frontend.min.css
@@ -5,23 +5,23 @@
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li:last-child>a{color:var(--color-text-subtle)}.go-Breadcrumb li>.go-Clipboard{margin:0 .5rem}.go-Carousel{align-items:center;display:flex;flex-direction:column;position:relative;text-align:center}.go-Carousel-slide{margin:.5rem 3rem}.go-Carousel-slide[aria-hidden]{display:none}.go-Carousel-prevSlide{left:0}.go-Carousel-nextSlide{right:0}.go-Carousel-prevSlide,.go-Carousel-nextSlide{background-color:transparent;border-radius:var(--border-radius);font-size:1.5rem;height:2.75rem;margin-top:-1.375rem;opacity:0;position:absolute;top:50%;width:2.75rem}.go-Carousel-prevSlide:hover,.go-Carousel-nextSlide:hover{background-color:var(--color-background-accented);cursor:pointer}.go-Carousel:hover .go-Carousel-prevSlide,.go-Carousel:hover .go-Carousel-nextSlide,.go-Carousel:focus-within .go-Carousel-prevSlide,.go-Carousel:focus-within 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var(--color-button-accented);color:var(--color-button-accented-text)}.go-Chip--inverted{background:var(--color-button-inverted);border:var(--border);color:var(--color-text)}.go-Chip--highlighted{background:var(--color-background-highlighted-link);border-color:var(--color-background-highlighted-link);color:var(--color-brand-primary)}.go-Chip--alert{background:var(--pink);border:.0625rem solid var(--pink);color:var(--color-text-inverted)}.go-Chip--vuln{background:var(--pink-light);border:.0625rem solid var(--pink-light);color:var(--color-text-inverted)}.go-Chip--subtle{background-color:var(--color-background-accented);border-color:transparent;color:var(--color-text-subtle)}.go-Clipboard{position:relative}.go-Clipboard:before{background-color:var(--color-background-inverted);border-radius:var(--border-radius);color:var(--color-text-inverted);content:attr(data-tooltip);display:block;font-size:.9em;left:calc(100% + .125rem);padding:.25rem .3rem;position:absolute;text-transform:uppercase;top:.125rem;white-space:nowrap;z-index:1000}.go-Clipboard:after{border-bottom:.25rem solid transparent;border-left:0;border-right:.25rem solid var(--color-background-inverted);border-top:.25rem solid transparent;content:"";display:block;position:absolute;right:-.125rem;top:.5625rem;z-index:1000}.go-Clipboard:not([data-tooltip]):before,.go-Clipboard:not([data-tooltip]):after,.go-Clipboard[data-tooltip=""]:before,.go-Clipboard[data-tooltip=""]:after{display:none}:root{--gray-1: #202224;--gray-2: #3e4042;--gray-3: #555759;--gray-4: #6e7072;--gray-5: #848688;--gray-6: #aaacae;--gray-7: #c6c8ca;--gray-8: #dcdee0;--gray-9: #f0f1f2;--gray-10: #f8f8f8;--turq-light: #5dc9e2;--turq-med: #50b7e0;--turq-dark: #007d9c;--blue: #bfeaf4;--blue-light: #f2fafd;--black: #000;--green: #3a6e11;--green-light: #5fda64;--pink: #c85e7a;--pink-light: #fdecf1;--purple: #542c7d;--slate: #253443;--white: #fff;--yellow: #fceea5;--yellow-light: #fff8cc;--color-brand-primary: var(--turq-dark);--color-background: var(--white);--color-background-inverted: var(--slate);--color-background-accented: var(--gray-10);--color-background-highlighted: var(--blue);--color-background-highlighted-link: var(--blue-light);--color-background-info: var(--gray-9);--color-background-warning: var(--yellow-light);--color-background-alert: var(--pink-light);--color-border: var(--gray-7);--color-text: var(--gray-1);--color-text-subtle: var(--gray-4);--color-text-link: var(--turq-dark);--color-text-inverted: var(--white);--color-code-comment: var(--green);--color-input: var(--color-background);--color-input-text: var(--color-text);--color-button: var(--turq-dark);--color-button-disabled: var(--gray-9);--color-button-text: var(--white);--color-button-text-disabled: var(--gray-3);--color-button-inverted: var(--color-background);--color-button-inverted-disabled: var(--color-background);--color-button-inverted-text: var(--color-brand-primary);--color-button-inverted-text-disabled: var(--color-text-subtle);--color-button-accented: var(--yellow);--color-button-accented-disabled: var(--gray-9);--color-button-accented-text: var(--gray-1);--color-button-accented-text-disabled: var(--gray-3)}[data-theme=dark]{--color-brand-primary: var(--turq-med);--color-background: var(--gray-1);--color-background-accented: var(--gray-2);--color-background-highlighted: var(--gray-2);--color-background-highlighted-link: var(--gray-2);--color-background-info: var(--gray-3);--color-background-warning: var(--yellow);--color-background-alert: var(--pink);--color-border: var(--gray-4);--color-text: var(--gray-9);--color-text-link: var(--turq-med);--color-text-subtle: var(--gray-7);--color-code-comment: var(--green-light)}@media (prefers-color-scheme: dark){:root:not([data-theme="light"]){--color-brand-primary: var(--turq-med);--color-background: var(--gray-1);--color-background-accented: var(--gray-2);--color-background-highlighted: var(--gray-2);--color-background-highlighted-link: var(--gray-2);--color-background-info: var(--gray-3);--color-background-warning: var(--yellow);--color-background-alert: var(--pink);--color-border: var(--gray-4);--color-text: var(--gray-9);--color-text-link: var(--turq-med);--color-text-subtle: var(--gray-7);--color-code-comment: var(--green-light)}}.go-Footer{background-color:var(--color-background-inverted);color:var(--color-text-inverted);font-size:.875rem;width:100%}.go-Footer-links{display:flex;flex-wrap:wrap;justify-content:space-between;margin:auto;max-width:75.75rem;padding:2rem 1.5rem 2.625rem}.go-Footer-linkColumn{flex:0 0 9.5rem}.go-Footer .go-Footer-link{color:var(--color-text-inverted);display:flex;flex:1;font-size:.875rem;line-height:2rem}.go-Footer .go-Footer-link--primary{font-size:1.125rem;line-height:1.75rem;margin-bottom:.5rem;margin-top:.75rem}.go-Footer-bottom{align-items:center;border-top:var(--border);display:flex;margin:0 1.5rem;min-height:4.125rem}.go-Footer-gopher{align-self:flex-end;height:3.147rem;width:5rem}.go-Footer-listRow{display:flex;flex:1;flex-wrap:wrap;list-style:none;margin:0;padding:0;text-align:center}.go-Footer-listItem{align-items:center;display:flex;flex:1 100%;justify-content:center;margin:.4rem 0;padding:0 1rem}.go-Footer-listItem a:link,.go-Footer-listItem a:visited{color:var(--color-text-inverted)}.go-Footer-listItem .go-Button--text{background-color:transparent;font-size:1rem;margin:-.5rem 0}.go-Footer-listItem [data-value]{display:none}[data-theme=auto] .go-Footer-listItem [data-value=auto],:root:not([data-theme]) .go-Footer-listItem [data-value=auto]{display:initial}[data-theme=dark] .go-Footer-listItem [data-value=dark],[data-theme=light] .go-Footer-listItem [data-value=light]{display:initial}.go-Footer-toggleTheme,.go-Footer-keyboard{margin:0 0 .5rem}.go-Footer-googleLogo{align-self:flex-end;height:1.5rem;margin-bottom:1.3rem;text-align:right}.go-Footer-googleLogoImg{height:1.5rem;width:4.529rem}@media only screen and (min-width: 52rem){.go-Footer-listItem{flex:initial}.go-Footer-listItem+.go-Footer-listItem{border-left:var(--border)}.go-Footer-toggleTheme{margin:0 0 0 -.5rem}.go-Footer-keyboard{margin:0}}select:focus:not([disabled]),input:focus:not([disabled]){border-color:var(--color-brand-primary);box-shadow:var(--focus-box-shadow);outline:transparent;z-index:2}input::placeholder{color:var(--color-text-subtle)}.go-Form{align-items:start;display:flex;flex-direction:column;gap:1rem}.go-Label{display:flex;flex-direction:column;gap:.5rem}.go-Label--inline{align-items:center;flex-direction:row}.go-Label legend{margin-bottom:.5rem}.go-Label--inline legend{float:left;margin-bottom:0}.go-Input,.go-Select{background:var(--color-input);border:var(--border);border-radius:var(--border-radius);color:var(--color-input-text)}.go-Input{padding:.4063rem .5rem}.go-Select{appearance:none;background:url(/static/shared/icon/arrow_drop_down_gm_grey_24dp.svg) right no-repeat;background-color:var(--color-background);background-position:right center;border-radius:var(--border-radius);margin:0;padding:.3438rem 1.25rem .3438rem .5rem}.go-InputGroup{display:flex}.go-InputGroup .go-Input{flex:1}.go-InputGroup>:not(:first-child,:last-child){border-radius:0;margin-left:-.0625rem}.go-InputGroup>:first-child{border-bottom-right-radius:0;border-top-right-radius:0}.go-InputGroup>:last-child{border-bottom-left-radius:0;border-top-left-radius:0;margin-left:-.0625rem}.go-InputGroup>*:hover,.go-InputGroup>*:focus{z-index:1}.go-ShortcutKey{display:flex;position:relative}.go-ShortcutKey .go-Input{flex-grow:1}.go-ShortcutKey:after{align-self:center;background-color:var(--color-background-accented);border-radius:.5rem;color:var(--gray-6);content:attr(data-shortcut);content:attr(data-shortcut) / attr(data-shortcut-alt);display:none;font-size:.75rem;padding:.0625rem 0;position:absolute;right:.75rem;text-align:center;width:1.5rem;z-index:1}@media only screen and (min-width: 52rem){.go-ShortcutKey:after{display:initial}}.go-GopherMessage img{display:block;height:15rem;margin:0 auto;padding:1.25rem 0;width:15rem}.go-GopherMessage p{font-weight:600;margin:auto;text-align:center}.go-Banner{background-color:var(--gray-1);display:none}.go-Banner-inner{align-items:center;display:flex;justify-content:space-between;margin:0 auto;min-height:2.5rem;padding:.5rem var(--gutter)}.Site--wide .go-Banner-inner{max-width:98rem}.go-Banner--full .go-Banner-inner{max-width:unset}.go-Banner-message{color:var(--white);margin-right:1.25rem}.go-Banner-action:link,.go-Banner-action:visited{color:var(--white);text-decoration:underline;white-space:nowrap}@media only screen and (min-width: 52rem){.go-Banner{display:block}}.go-Header{background:#007d9c;border-bottom:none;box-shadow:0 .0625rem .125rem #ababab4d;top:0;width:100%;z-index:20}.go-Header-inner{margin:0 auto;padding:0 var(--gutter)}.Site--wide .go-Header-inner{max-width:98rem}.go-Header--full .go-Header-inner{max-width:initial}.go-Header-nav{align-items:center;display:flex;height:3.5rem;justify-content:space-between}.go-Header-rightContent{align-items:center;display:flex;height:100%;justify-content:flex-end;width:100%}.go-Header-rightContent form{flex-grow:1}.go-Header-inner--dark{border-bottom:none;color:var(--white)}.go-Header-logo{display:block;height:2rem;margin-right:2.25rem;width:5.125rem}.go-Header-logo--hidden{display:none}.go-Header-menuItem{display:none;position:relative}.go-Header-menu{align-items:stretch;display:flex;height:100%;list-style:none;margin:0;padding:0}.go-Header-submenu{background:transparent;background-color:var(--color-background);border:.0625rem solid #007d9d;border-width:0 .0625rem .0625rem;color:var(--color-text);display:none;flex-flow:column wrap;list-style-type:none;margin-top:3.5rem;opacity:0;padding:1.5rem 1.5rem 0;position:absolute;transition:all .2s ease;visibility:hidden}.go-Header-menuItem:hover>.js-desktop-menu-hover:not(.forced-closed)~.go-Header-submenu,.go-Header-menuItem:focus-within>.js-desktop-menu-hover:not(.forced-closed)~.go-Header-submenu{display:flex;opacity:1;visibility:visible}.go-Header-menuItem .go-Header-submenuItem a:link,.go-Header-menuItem .go-Header-submenuItem a:visited{align-items:baseline;border-bottom:none;color:var(--color-text-link);display:inline-flex;font-weight:400;margin:0;margin-bottom:-.125rem;padding:0}.go-Header-menuItem .go-Icon{filter:brightness(0%) saturate(100%) invert(100%);font-size:1.25rem}.go-Header-menuItem .go-Header-submenuItem .go-Icon,.go-NavigationDrawer-listItem .go-Icon{filter:brightness(0) saturate(100%) invert(60%) sepia(97%) saturate(125%) hue-rotate(162deg) brightness(71%) contrast(177%)}.go-Header-submenu .go-Header-submenuItem i{font-size:.75rem;margin-left:.25rem;transform:translateY(.1rem)}.go-Header-menu .go-Header-submenu--why{left:-.0625rem;width:18.5rem}.go-Header-menu .go-Header-submenu--docs{height:20.78rem;left:-12rem;width:37.25rem}.go-Header-menu .go-Header-submenu--community{height:18.4rem;right:-.0625rem;width:37.25rem}.go-Header-socialIcons{display:flex;flex-wrap:wrap}.go-Header-submenu .go-Header-submenuItem a.go-Header-socialIcon{display:inline-flex;flex:0 1 auto;width:auto}.go-Header-submenu .go-Header-submenuItem a.go-Header-socialIcon:not(:last-child){margin-right:.75rem}@media only screen and (min-width: 65rem){.go-Header-menuItem{align-items:stretch;display:inline-flex;flex:none}.go-Header-menu{justify-content:flex-end}.go-Header-navOpen{display:none}}.go-Header-menuItem .js-desktop-menu-hover img{pointer-events:none}.go-Header-menuItem a:link,.go-Header-menuItem a:visited{align-items:center;border-bottom:.1875rem solid transparent;border-top:.1875rem solid transparent;color:var(--color-text);display:inline-flex;padding:0 1.5rem;text-align:center;text-decoration:none;width:100%}.go-Header-menuItem--active a:link,.go-Header-menuItem--active a:visited{border-bottom-color:var(--turq-med);font-weight:700}.go-Header-menuItem a:hover{border-bottom-color:var(--white)}.go-Header-menuItem:hover>a:not(.forced-closed).js-desktop-menu-hover,.go-Header-menuItem:focus-within>a:not(.forced-closed).js-desktop-menu-hover{background:var(--white);border-color:var(--white);color:var(--color-text-link)}@media (prefers-color-scheme: dark){:root:not([data-theme="light"]) .go-Header-menuItem:hover>a:not(.forced-closed).js-desktop-menu-hover .go-Icon,:root:not([data-theme="light"]) .go-Header-menuItem:focus-within>a:not(.forced-closed).js-desktop-menu-hover .go-Icon{filter:brightness(0) saturate(100%) invert(60%) sepia(97%) saturate(125%) hue-rotate(158deg) brightness(83%) contrast(157%)}:root:not([data-theme="light"]) .go-Header-submenuItem .go-Icon:not(.go-Icon--accented){filter:brightness(0) saturate(100%) invert(60%) sepia(97%) saturate(125%) hue-rotate(163deg) brightness(80%) contrast(157%)}}.go-NavigationDrawer-listItem>div:not(.go-NavigationDrawer),.go-NavigationDrawer-listItem a:link,.go-NavigationDrawer-listItem a:visited{display:block;margin:0 1rem;padding:.5rem}.go-NavigationDrawer-listItem>span{color:var(--gray-2)}.go-Header-inner--dark .go-Header-menuItem a:link,.go-Header-inner--dark .go-Header-menuItem a:visited{color:var(--white)}.go-NavigationDrawer-listItem.go-NavigationDrawer-hasSubnav>a i{float:right}.go-Header-inner--dark .go-Header-menuItem .go-Header-submenuItem{color:var(--color-text-link)}.go-Header-inner--dark .go-Header-menuItem .js-desktop-menu-hover.is-expanded{background-color:var(--white);color:var(--color-text-link)}.go-Header-inner--dark .go-Header-menuItem .go-Header-submenu a:link,.go-Header-inner--dark .go-Header-menuItem .go-Header-submenu a:visited{align-items:baseline;color:var(--color-text-link);display:inline-flex;margin-bottom:-.125rem;width:auto}.go-Header-submenu .go-Header-submenuItem a:link,.go-Header-submenu .go-Header-submenuItem a:visited{border-bottom:none;font-weight:400;margin:0;padding:0}.go-Header-inner--dark .go-Header-menuItem:hover>a:not(.forced-closed).js-desktop-menu-hover,.go-Header-inner--dark .go-Header-menuItem:focus-within>a:not(.forced-closed).js-desktop-menu-hover{background:var(--color-background);border-color:var(--color-background)}.go-Header-submenu p{max-width:15.5rem}.go-Header-submenu a:link:hover,.go-Header-submenu a:visited:hover{border-bottom:.125rem solid var(--turq-dark);text-decoration:none}.go-Header-submenu a:link:hover>*,.go-Header-submenu a:visited:hover>*{text-decoration:none}.go-Header-submenu .go-Header-submenuItem{line-height:1;padding-bottom:1.5rem}.go-Header-submenu .go-Header-submenuItem p{color:var(--color-text-subtle);font-size:.875rem;margin-top:.55rem}.go-Header-inner--dark .go-Header-submenu .go-Header-submenuItem p{color:var(--color-text-subtle)}.go-Header-navOpen{background:no-repeat center/2rem url(/images/menu-24px.svg);border:none;height:2.5rem;margin-left:1rem;width:2.5rem}.go-Header-navOpen--hidden{display:none}.go-Header-navOpen--white{background:no-repeat center/2rem url(/static/shared/icon/menu_gm_grey_24dp.svg);filter:brightness(0) saturate(100%) invert(100%) sepia(97%) saturate(13%) hue-rotate(245deg) brightness(103%) contrast(107%)}.go-SearchForm--expanded{flex-grow:1}.go-SearchForm-form{display:none}.go-SearchForm-form:after{right:2.75rem}.go-SearchForm--expanded .go-SearchForm-form{display:flex}.go-SearchForm-expandSearch{appearance:none;background:none;font-size:1.5rem}.go-SearchForm--expanded .go-SearchForm-expandSearch{display:none}@media only screen and (min-width: 32rem){.go-Header-rightContent{width:100%}.go-SearchForm{flex:1}.go-SearchForm-form{display:flex}.go-SearchForm-expandSearch{display:none}.go-Header-logo--hidden{display:initial}}.go-NavigationDrawer{background:var(--color-background);height:100%;left:auto;max-width:27rem;position:fixed;right:0;top:0;transform:translate(100%);transition:transform .1s ease-in-out;width:85%;z-index:30}@media only screen and (min-width: 65rem){.go-NavigationDrawer{display:none}}.go-NavigationDrawer.is-active{transform:translate(0)}.go-NavigationDrawer-header{border-bottom:.0625rem solid #eee;margin-bottom:.5rem}.go-NavigationDrawer-submenuItem{width:100%}.go-NavigationDrawer-submenuItem .go-NavigationDrawer-header{align-items:center;color:var(--color-text-link);display:flex;font-size:1.375rem;justify-content:flex-start;min-height:4.0625rem;padding:.5rem .5rem .5rem 1.5rem}.go-NavigationDrawer-submenuItem .go-NavigationDrawer-header>a{display:flex;margin-left:0}.go-NavigationDrawer-logo{display:block;height:2rem;margin:1rem;width:5.125rem}.go-NavigationDrawer-list{list-style:none;margin:0;padding:0}.go-NavigationDrawer-listItem{color:var(--color-text-subtle);font-size:1.125rem;margin:0 .5rem}.go-NavigationDrawer-listItem--active{background-color:var(--blue);border-radius:.4rem}.go-NavigationDrawer-listItem .material-icons{color:var(--color-brand-primary);display:inline-block;margin-right:.5rem;text-decoration:none;vertical-align:sub}@media only screen and (max-width: 57.7rem){.go-NavigationDrawer-listItem .go-Header-socialIcons{padding:.5rem 0}.go-NavigationDrawer-listItem a.go-Header-socialIcon{display:inline-block;margin:0;padding:0 .5rem}@media (prefers-color-scheme: dark){:root:not([data-theme="light"]) .go-NavigationDrawer-listItem .go-Icon:not(.go-Icon--accented){filter:brightness(0) saturate(100%) invert(60%) sepia(97%) saturate(125%) hue-rotate(163deg) brightness(80%) contrast(157%)}}}.go-NavigationDrawer-scrim{display:none;height:100%;left:0;position:fixed;top:0;width:100%;z-index:20}.go-NavigationDrawer.is-active+.go-NavigationDrawer-scrim{background-color:var(--gray-1);display:block;opacity:.32}.depsdev-Icon{height:1.125em;vertical-align:text-bottom;width:auto}.go-Icon{filter:none;height:1.125em;vertical-align:text-bottom;width:auto}.go-Icon--accented{filter:brightness(0) invert(45%) sepia(94%) saturate(6735%) hue-rotate(176deg) brightness(94%) contrast(101%)}.go-Icon--inverted{filter:brightness(0) saturate(100%) invert(100%) sepia(97%) saturate(13%) hue-rotate(245deg) brightness(103%) contrast(107%)}[data-theme=dark] .go-Icon:not(.go-Icon--accented){filter:brightness(0) saturate(100%) invert(100%) sepia(97%) saturate(13%) hue-rotate(245deg) brightness(103%) contrast(107%)}[data-theme=dark] .go-Icon--accented{filter:brightness(0) invert(69%) sepia(46%) saturate(466%) hue-rotate(153deg) brightness(90%) contrast(88%)}@media (prefers-color-scheme: dark){:root:not([data-theme="light"]) .go-Icon:not(.go-Icon--accented){filter:brightness(0) saturate(100%) invert(100%) sepia(97%) saturate(13%) hue-rotate(245deg) brightness(103%) contrast(107%)}:root:not([data-theme="light"]) .go-Icon--accented{filter:brightness(0) invert(57%) sepia(63%) saturate(4864%) hue-rotate(160deg) brightness(100%) contrast(101%)}}.go-Message{color:var(--color-text);font-size:.875rem;line-height:1.5rem;padding:.25rem .5rem;width:100%}.go-Message--notice{background-color:var(--color-background-info)}.go-Message--warning{background-color:var(--color-background-warning);color:var(--gray-1)}.go-Message--alert{background-color:var(--color-background-alert)}.go-Message>.go-Icon{vertical-align:text-top}[data-theme=dark] .go-Message a:not(:hover){color:var(--color-text);text-decoration:underline}[data-theme=dark] .go-Message--warning .go-Icon{filter:none}@media (prefers-color-scheme: dark){:root:not([data-theme="light"]) .go-Message--warning .go-Icon{filter:none}}dialog{position:absolute;left:0;right:0;width:-moz-fit-content;width:-webkit-fit-content;width:fit-content;height:-moz-fit-content;height:-webkit-fit-content;height:fit-content;margin:auto;border:solid;padding:1em;background:white;color:#000;display:block}dialog:not([open]){display:none}dialog+.backdrop{position:fixed;inset:0;background:rgba(0,0,0,.1)}._dialog_overlay{position:fixed;inset:0}dialog.fixed{position:fixed;top:50%;transform:translateY(-50%)}.go-Modal{background:var(--color-background);border:var(--border);border-radius:var(--border-radius);bottom:0;box-shadow:var(--box-shadow);color:var(--color-text);display:flex;flex-direction:column;gap:1rem;max-height:100%;max-width:100%;position:fixed;top:0}.go-Modal>form{display:contents}.go-Modal--small{width:20rem}.go-Modal--md{width:30rem}.go-Modal--lg{width:40rem}.go-Modal-header{display:flex;justify-content:space-between}.go-Modal-header h2{font-size:1.15rem;line-height:1.25rem}.go-Modal-body{flex-grow:1;min-height:2rem;min-width:18rem}.go-Modal-actions{text-align:right}@media not all and (min-resolution: .001dpcm){@supports (-webkit-appearance: none){.go-Modal{padding-bottom:0}}}.go-Tree{--js-tree-height: 0;display:flex;flex-direction:column}.go-Tree ul{list-style:none;padding-left:0}.go-Tree li:last-of-type{padding-bottom:.25rem}.go-Tree a+ul{display:none}.go-Tree a[aria-expanded=true]+ul[role=group]{display:block}.go-Tree a[aria-level="1"]+ul[role=group]{max-height:calc(100vh - var(--js-tree-height, 0) - var(--js-sticky-header-height, 3.5rem) - 5rem);overflow-y:auto;padding:.5rem .25rem 0}.go-Tree a{color:var(--color-text-subtle);display:block;line-height:1.5rem;overflow:hidden;padding:.125rem 0 .125rem 1.25rem;position:relative;text-overflow:ellipsis;user-select:none;white-space:nowrap}.go-Tree>li>a,.go-Tree a[aria-level="1"]{display:block;font-size:1rem;font-weight:500;line-height:2.5rem;padding:0 1rem}.go-Tree a:focus,.go-Tree a:hover{text-decoration:underline;z-index:1}.go-Tree a[aria-selected=true]{color:var(--color-text);font-weight:500}.go-Tree a[aria-level="1"][aria-selected=true],.go-Tree a[aria-level="1"][aria-expanded=true]{background-color:var(--color-background-accented)}.go-Tree a[aria-level="3"][aria-expanded=true]{margin-bottom:.375em}.go-Tree a[aria-level="2"]{margin-bottom:.25rem;position:relative}.go-Tree a[aria-level="3"]{padding-left:2.5rem}.go-Tree a[aria-level="4"]{border-left:.125rem solid var(--color-background-accented);margin-left:2.5rem;padding-left:.5rem}.go-Tree a[aria-selected=true][aria-level="2"]:not([aria-expanded]):before,.go-Tree a[aria-selected=true][aria-level="3"]:not([aria-expanded]):before{background-color:var(--color-brand-primary);border-radius:50%;content:"";display:block;height:.3125rem;left:.4688rem;position:absolute;top:.75rem;width:.3125rem}.go-Tree a[aria-expanded][aria-owns][aria-level="2"]:before,.go-Tree a[aria-expanded][aria-owns][aria-level="3"]:before{border-bottom:.25rem solid transparent;border-left:.25rem solid var(--color-border);border-right:0;border-top:.25rem solid transparent;content:"";display:block;height:0;left:.5rem;position:absolute;top:.625rem;transition:transform .1s linear;width:0}.go-Tree a[aria-expanded=true][aria-level="2"]:before,.go-Tree a[aria-expanded=true][aria-level="3"]:before{transform:rotate(90deg)}.go-Tree a[aria-expanded][aria-level="3"]:not([empty]):before,.go-Tree a[aria-selected][aria-level="3"]:not([empty]):before{left:1.5rem;top:.75rem}.go-Tree a[aria-selected=true][aria-level="4"]{border-left:.125rem solid var(--color-brand-primary)}.go-TabNav{margin:0 0 .5rem}.go-TabNav ul{display:flex;gap:2rem}.go-TabNav li{border-bottom:.25rem transparent solid;display:flex;font-size:1rem;height:2.375rem;padding:0 .25rem}.go-TabNav li[aria-current],.go-TabNav li:hover{border-color:var(--color-brand-primary)}.go-TabNav a{align-items:center;color:var(--color-text-subtle);display:inline-flex}.go-TabNav li:hover a{text-decoration:none}.go-TabNav li[aria-current] a{color:var(--color-text)}.go-Tooltip{border-radius:var(--border-radius);cursor:pointer;display:inline-block;position:relative}.go-Tooltip>summary{list-style:none}.go-Tooltip>summary::-webkit-details-marker,.go-Tooltip>summary::marker{display:none}.go-Tooltip>summary>img{vertical-align:text-bottom}.go-Tooltip p{background:var(--color-background) 80%;border:var(--border);border-radius:var(--border-radius);color:var(--color-text);font-size:.75rem;letter-spacing:.0187rem;line-height:1rem;padding:.5rem;position:absolute;top:1.5rem;white-space:normal;width:12rem;z-index:100}:root{--gutter: 1.5rem;--gap: 1rem;--scroll-margin: calc( var(--js-sticky-header-height, 3.5rem) + var(--js-sticky-nav-height, 0) + 2rem );--border: .0625rem solid var(--color-border);--border-radius: .25rem;--box-shadow: 0 0 .375rem 0 rgb(0 0 0 / 25%);--focus-box-shadow: 0 0 .0625rem .0625rem rgb(0 112 210 / 60%)}[data-theme=dark]{--box-shadow: 0 .3125rem .9375rem rgb(0 0 0 / 45%)}@media (prefers-color-scheme: dark){:root:not([data-theme="light"]){--box-shadow: 0 .3125rem .9375rem rgb(0 0 0 / 45%)}}@media (min-width: 50rem){:root{--gap: 2rem;--scroll-margin: calc( var(--js-sticky-header-height, 3.5rem) + var(--js-sticky-nav-height, 0) + 1rem )}}*:target{scroll-margin-top:var(--scroll-margin)}body{background-color:var(--color-background);display:flex;flex-direction:column;min-height:100vh;min-width:23.5rem;-webkit-overflow-scrolling:touch}.go-Container{display:flex;flex-direction:column;flex-grow:1;height:100%;margin-bottom:5rem}.go-Content{display:flex;flex-flow:column;gap:1rem;margin:0 auto;max-width:63rem;min-height:32rem;padding:2rem var(--gutter);width:100%}.go-Content--center{justify-content:center;margin:auto}.JumpDialog-body{height:12rem;overflow-y:auto}.JumpDialog-list{display:flex;flex-direction:column}.JumpDialog-input{width:100%}.JumpDialog a{padding:.25rem;text-decoration:none}.JumpDialog .JumpDialog-active{background-color:var(--color-brand-primary);color:var(--white)}.ShortcutsDialog-key{text-align:right}.ShortcutsDialog table{padding:0 1rem}.ShortcutsDialog td{padding-bottom:.5rem;padding-left:.5rem}.ShortcutsDialog-theme span{display:none}[data-theme=light] .ShortcutsDialog-themeLight,[data-theme=dark] .ShortcutsDialog-themeDark,[data-theme=""] .ShortcutsDialog-themeAuto,[data-theme=auto] .ShortcutsDialog-themeAuto{display:initial}
 /*!
- * Copyright 2020 The Go Authors. All rights reserved.
- * Use of this source code is governed by a BSD-style
- * license that can be found in the LICENSE file.
- */
-/*!
- * Copyright 2021 The Go Authors. All rights reserved.
- * Use of this source code is governed by a BSD-style
- * license that can be found in the LICENSE file.
- */
-/*!
  * http://meyerweb.com/eric/tools/css/reset/
  * v2.0 | 20110126
  * License: none (public domain)
  */
 /*!
+ * Copyright 2020 The Go Authors. All rights reserved.
+ * Use of this source code is governed by a BSD-style
+ * license that can be found in the LICENSE file.
+ */
+/*!
 * Copyright 2021 The Go Authors. All rights reserved.
 * Use of this source code is governed by a BSD-style
 * license that can be found in the LICENSE file.
 */
+/*!
+ * Copyright 2021 The Go Authors. All rights reserved.
+ * Use of this source code is governed by a BSD-style
+ * license that can be found in the LICENSE file.
+ */
 /*# sourceMappingURL=frontend.min.css.map */
diff --git a/static/frontend/styleguide/styleguide.js.map b/static/frontend/styleguide/styleguide.js.map
index 7c948ea..a933ff7 100644
--- a/static/frontend/styleguide/styleguide.js.map
+++ b/static/frontend/styleguide/styleguide.js.map
@@ -2,6 +2,6 @@
   "version": 3,
   "sources": ["../../shared/carousel/carousel.ts", "../../shared/outline/select.ts", "../../shared/outline/tree.ts", "styleguide.ts"],
   "sourcesContent": ["/**\n * @license\n * Copyright 2021 The Go Authors. All rights reserved.\n * Use of this source code is governed by a BSD-style\n * license that can be found in the LICENSE file.\n */\n\n/**\n * Carousel Controller adds event listeners, accessibility enhancements, and\n * control elements to a carousel component.\n */\nexport class CarouselController {\n  /**\n   * slides is a collection of slides in the carousel.\n   */\n  private slides: HTMLLIElement[];\n  /**\n   * dots is a collection of dot navigation controls, added to the carousel\n   * by this controller.\n   */\n  private dots: HTMLElement[];\n  /**\n   * liveRegion is a visually hidden element that notifies assitive devices\n   * of visual changes to the carousel. They are added to the carousel by\n   * this controller.\n   */\n  private liveRegion: HTMLElement;\n  /**\n   * activeIndex is the 0-index of the currently active slide.\n   */\n  private activeIndex: number;\n\n  constructor(private el: HTMLElement) {\n    this.slides = Array.from(el.querySelectorAll('.go-Carousel-slide'));\n    this.dots = [];\n    this.liveRegion = document.createElement('div');\n    this.activeIndex = Number(el.getAttribute('data-slide-index') ?? 0);\n\n    this.initSlides();\n    this.initArrows();\n    this.initDots();\n    this.initLiveRegion();\n  }\n\n  private initSlides() {\n    for (const [i, v] of this.slides.entries()) {\n      if (i === this.activeIndex) continue;\n      v.setAttribute('aria-hidden', 'true');\n    }\n  }\n\n  private initArrows() {\n    const arrows = document.createElement('ul');\n    arrows.classList.add('go-Carousel-arrows');\n    arrows.innerHTML = `\n      <li>\n        <button class=\"go-Carousel-prevSlide\" aria-label=\"Go to previous slide\">\n          <img class=\"go-Icon\" height=\"24\" width=\"24\" src=\"/static/shared/icon/arrow_left_gm_grey_24dp.svg\" alt=\"\">\n        </button>\n      </li>\n      <li>\n        <button class=\"go-Carousel-nextSlide\" aria-label=\"Go to next slide\">\n          <img class=\"go-Icon\" height=\"24\" width=\"24\" src=\"/static/shared/icon/arrow_right_gm_grey_24dp.svg\" alt=\"\">\n        </button>\n      </li>\n    `;\n    arrows\n      .querySelector('.go-Carousel-prevSlide')\n      ?.addEventListener('click', () => this.setActive(this.activeIndex - 1));\n    arrows\n      .querySelector('.go-Carousel-nextSlide')\n      ?.addEventListener('click', () => this.setActive(this.activeIndex + 1));\n    this.el.append(arrows);\n  }\n\n  private initDots() {\n    const dots = document.createElement('ul');\n    dots.classList.add('go-Carousel-dots');\n    for (let i = 0; i < this.slides.length; i++) {\n      const li = document.createElement('li');\n      const button = document.createElement('button');\n      button.classList.add('go-Carousel-dot');\n      if (i === this.activeIndex) {\n        button.classList.add('go-Carousel-dot--active');\n      }\n      button.innerHTML = `<span class=\"go-Carousel-obscured\">Slide ${i + 1}</span>`;\n      button.addEventListener('click', () => this.setActive(i));\n      li.append(button);\n      dots.append(li);\n      this.dots.push(button);\n    }\n    this.el.append(dots);\n  }\n\n  private initLiveRegion() {\n    this.liveRegion.setAttribute('aria-live', 'polite');\n    this.liveRegion.setAttribute('aria-atomic', 'true');\n    this.liveRegion.setAttribute('class', 'go-Carousel-obscured');\n    this.liveRegion.textContent = `Slide ${this.activeIndex + 1} of ${this.slides.length}`;\n    this.el.appendChild(this.liveRegion);\n  }\n\n  private setActive = (index: number) => {\n    this.activeIndex = (index + this.slides.length) % this.slides.length;\n    this.el.setAttribute('data-slide-index', String(this.activeIndex));\n    for (const d of this.dots) {\n      d.classList.remove('go-Carousel-dot--active');\n    }\n    this.dots[this.activeIndex].classList.add('go-Carousel-dot--active');\n    for (const s of this.slides) {\n      s.setAttribute('aria-hidden', 'true');\n    }\n    this.slides[this.activeIndex].removeAttribute('aria-hidden');\n    this.liveRegion.textContent = 'Slide ' + (this.activeIndex + 1) + ' of ' + this.slides.length;\n  };\n}\n", "/**\n * @license\n * Copyright 2021 The Go Authors. All rights reserved.\n * Use of this source code is governed by a BSD-style\n * license that can be found in the LICENSE file.\n */\n\nimport { TreeNavController } from './tree.js';\n\nexport class SelectNavController {\n  constructor(private el: Element) {\n    this.el.addEventListener('change', e => {\n      const target = e.target as HTMLSelectElement;\n      let href = target.value;\n      if (!target.value.startsWith('/')) {\n        href = '/' + href;\n      }\n      window.location.href = href;\n    });\n  }\n}\n\nexport function makeSelectNav(tree: TreeNavController): HTMLLabelElement {\n  const label = document.createElement('label');\n  label.classList.add('go-Label');\n  label.setAttribute('aria-label', 'Menu');\n  const select = document.createElement('select');\n  select.classList.add('go-Select', 'js-selectNav');\n  label.appendChild(select);\n  const outline = document.createElement('optgroup');\n  outline.label = 'Outline';\n  select.appendChild(outline);\n  const groupMap: Record<string, HTMLOptGroupElement> = {};\n  let group: HTMLOptGroupElement;\n  for (const t of tree.treeitems) {\n    if (Number(t.depth) > 4) continue;\n    if (t.groupTreeitem) {\n      group = groupMap[t.groupTreeitem.label];\n      if (!group) {\n        group = groupMap[t.groupTreeitem.label] = document.createElement('optgroup');\n        group.label = t.groupTreeitem.label;\n        select.appendChild(group);\n      }\n    } else {\n      group = outline;\n    }\n    const o = document.createElement('option');\n    o.label = t.label;\n    o.textContent = t.label;\n    o.value = (t.el as HTMLAnchorElement).href.replace(window.location.origin, '').replace('/', '');\n    group.appendChild(o);\n  }\n  tree.addObserver(t => {\n    const hash = (t.el as HTMLAnchorElement).hash;\n    const value = select.querySelector<HTMLOptionElement>(`[value$=\"${hash}\"]`)?.value;\n    if (value) {\n      select.value = value;\n    }\n  }, 50);\n  return label;\n}\n", "/**\n * @license\n * Copyright 2021 The Go Authors. All rights reserved.\n * Use of this source code is governed by a BSD-style\n * license that can be found in the LICENSE file.\n */\n\n/**\n * TreeNavController is the navigation tree component of the documentation page.\n * It adds accessiblity attributes to a tree, observes the heading elements\n * focus the topmost link for headings visible on the page, and implements the\n * WAI-ARIA Treeview Design Pattern with full\n * [keyboard support](https://www.w3.org/TR/wai-aria-practices/examples/treeview/treeview-2/treeview-2a.html#kbd_label).\n */\nexport class TreeNavController {\n  treeitems: TreeItem[];\n\n  /**\n   * firstChars is the first character of each treeitem in the same order\n   * as this.treeitems. We use this array to set focus by character when\n   * navigating the tree with a keyboard.\n   */\n  private firstChars: string[];\n  private firstTreeitem: TreeItem | null;\n  private lastTreeitem: TreeItem | null;\n  private observerCallbacks: ((t: TreeItem) => void)[];\n\n  constructor(private el: HTMLElement) {\n    this.treeitems = [];\n    this.firstChars = [];\n    this.firstTreeitem = null;\n    this.lastTreeitem = null;\n    this.observerCallbacks = [];\n    this.init();\n  }\n\n  private init(): void {\n    this.handleResize();\n    window.addEventListener('resize', this.handleResize);\n    this.findTreeItems();\n    this.updateVisibleTreeitems();\n    this.observeTargets();\n    if (this.firstTreeitem) {\n      this.firstTreeitem.el.tabIndex = 0;\n    }\n  }\n\n  private handleResize = (): void => {\n    this.el.style.setProperty('--js-tree-height', '100vh');\n    this.el.style.setProperty('--js-tree-height', this.el.clientHeight + 'px');\n  };\n\n  private observeTargets() {\n    this.addObserver(treeitem => {\n      this.expandTreeitem(treeitem);\n      this.setSelected(treeitem);\n      // TODO: Fix scroll issue in https://golang.org/issue/47450.\n      // treeitem.el.scrollIntoView({ block: 'nearest' });\n    });\n\n    const targets = new Map<string, boolean>();\n    const observer = new IntersectionObserver(\n      entries => {\n        for (const entry of entries) {\n          targets.set(entry.target.id, entry.isIntersecting || entry.intersectionRatio === 1);\n        }\n        for (const [id, isIntersecting] of targets) {\n          if (isIntersecting) {\n            const active = this.treeitems.find(t =>\n              (t.el as HTMLAnchorElement)?.href.endsWith(`#${id}`)\n            );\n            if (active) {\n              for (const fn of this.observerCallbacks) {\n                fn(active);\n              }\n            }\n            break;\n          }\n        }\n      },\n      {\n        threshold: 1.0,\n        rootMargin: '-60px 0px 0px 0px',\n      }\n    );\n\n    for (const href of this.treeitems.map(t => t.el.getAttribute('href'))) {\n      if (href) {\n        const id = href.replace(window.location.origin, '').replace('/', '').replace('#', '');\n        const target = document.getElementById(id);\n        if (target) {\n          observer.observe(target);\n        }\n      }\n    }\n  }\n\n  addObserver(fn: (t: TreeItem) => void, delay = 200): void {\n    this.observerCallbacks.push(debounce(fn, delay));\n  }\n\n  setFocusToNextItem(currentItem: TreeItem): void {\n    let nextItem = null;\n    for (let i = currentItem.index + 1; i < this.treeitems.length; i++) {\n      const ti = this.treeitems[i];\n      if (ti.isVisible) {\n        nextItem = ti;\n        break;\n      }\n    }\n    if (nextItem) {\n      this.setFocusToItem(nextItem);\n    }\n  }\n\n  setFocusToPreviousItem(currentItem: TreeItem): void {\n    let prevItem = null;\n    for (let i = currentItem.index - 1; i > -1; i--) {\n      const ti = this.treeitems[i];\n      if (ti.isVisible) {\n        prevItem = ti;\n        break;\n      }\n    }\n    if (prevItem) {\n      this.setFocusToItem(prevItem);\n    }\n  }\n\n  setFocusToParentItem(currentItem: TreeItem): void {\n    if (currentItem.groupTreeitem) {\n      this.setFocusToItem(currentItem.groupTreeitem);\n    }\n  }\n\n  setFocusToFirstItem(): void {\n    this.firstTreeitem && this.setFocusToItem(this.firstTreeitem);\n  }\n\n  setFocusToLastItem(): void {\n    this.lastTreeitem && this.setFocusToItem(this.lastTreeitem);\n  }\n\n  setSelected(currentItem: TreeItem): void {\n    for (const l1 of this.el.querySelectorAll('[aria-expanded=\"true\"]')) {\n      if (l1 === currentItem.el) continue;\n      if (!l1.nextElementSibling?.contains(currentItem.el)) {\n        l1.setAttribute('aria-expanded', 'false');\n      }\n    }\n    for (const l1 of this.el.querySelectorAll('[aria-selected]')) {\n      if (l1 !== currentItem.el) {\n        l1.setAttribute('aria-selected', 'false');\n      }\n    }\n    currentItem.el.setAttribute('aria-selected', 'true');\n    this.updateVisibleTreeitems();\n    this.setFocusToItem(currentItem, false);\n  }\n\n  expandTreeitem(treeitem: TreeItem): void {\n    let currentItem: TreeItem | null = treeitem;\n    while (currentItem) {\n      if (currentItem.isExpandable) {\n        currentItem.el.setAttribute('aria-expanded', 'true');\n      }\n      currentItem = currentItem.groupTreeitem;\n    }\n    this.updateVisibleTreeitems();\n  }\n\n  expandAllSiblingItems(currentItem: TreeItem): void {\n    for (const ti of this.treeitems) {\n      if (ti.groupTreeitem === currentItem.groupTreeitem && ti.isExpandable) {\n        this.expandTreeitem(ti);\n      }\n    }\n  }\n\n  collapseTreeitem(currentItem: TreeItem): void {\n    let groupTreeitem = null;\n\n    if (currentItem.isExpanded()) {\n      groupTreeitem = currentItem;\n    } else {\n      groupTreeitem = currentItem.groupTreeitem;\n    }\n\n    if (groupTreeitem) {\n      groupTreeitem.el.setAttribute('aria-expanded', 'false');\n      this.updateVisibleTreeitems();\n      this.setFocusToItem(groupTreeitem);\n    }\n  }\n\n  setFocusByFirstCharacter(currentItem: TreeItem, char: string): void {\n    let start: number, index: number;\n    char = char.toLowerCase();\n\n    // Get start index for search based on position of currentItem\n    start = currentItem.index + 1;\n    if (start === this.treeitems.length) {\n      start = 0;\n    }\n\n    // Check remaining slots in the menu\n    index = this.getIndexFirstChars(start, char);\n\n    // If not found in remaining slots, check from beginning\n    if (index === -1) {\n      index = this.getIndexFirstChars(0, char);\n    }\n\n    // If match was found...\n    if (index > -1) {\n      this.setFocusToItem(this.treeitems[index]);\n    }\n  }\n\n  private findTreeItems() {\n    const findItems = (el: HTMLElement, group: TreeItem | null) => {\n      let ti = group;\n      let curr = el.firstElementChild as HTMLElement;\n      while (curr) {\n        if (curr.tagName === 'A' || curr.tagName === 'SPAN') {\n          ti = new TreeItem(curr, this, group);\n          this.treeitems.push(ti);\n          this.firstChars.push(ti.label.substring(0, 1).toLowerCase());\n        }\n        if (curr.firstElementChild) {\n          findItems(curr, ti);\n        }\n        curr = curr.nextElementSibling as HTMLElement;\n      }\n    };\n    findItems(this.el as HTMLElement, null);\n    this.treeitems.map((ti, idx) => (ti.index = idx));\n  }\n\n  private updateVisibleTreeitems(): void {\n    this.firstTreeitem = this.treeitems[0];\n\n    for (const ti of this.treeitems) {\n      let parent = ti.groupTreeitem;\n      ti.isVisible = true;\n      while (parent && parent.el !== this.el) {\n        if (!parent.isExpanded()) {\n          ti.isVisible = false;\n        }\n        parent = parent.groupTreeitem;\n      }\n      if (ti.isVisible) {\n        this.lastTreeitem = ti;\n      }\n    }\n  }\n\n  private setFocusToItem(treeitem: TreeItem, focusEl = true) {\n    treeitem.el.tabIndex = 0;\n    if (focusEl) {\n      treeitem.el.focus();\n    }\n    for (const ti of this.treeitems) {\n      if (ti !== treeitem) {\n        ti.el.tabIndex = -1;\n      }\n    }\n  }\n\n  private getIndexFirstChars(startIndex: number, char: string): number {\n    for (let i = startIndex; i < this.firstChars.length; i++) {\n      if (this.treeitems[i].isVisible && char === this.firstChars[i]) {\n        return i;\n      }\n    }\n    return -1;\n  }\n}\n\nclass TreeItem {\n  el: HTMLElement;\n  groupTreeitem: TreeItem | null;\n  label: string;\n  isExpandable: boolean;\n  isVisible: boolean;\n  depth: number;\n  index: number;\n\n  private tree: TreeNavController;\n  private isInGroup: boolean;\n\n  constructor(el: HTMLElement, treeObj: TreeNavController, group: TreeItem | null) {\n    el.tabIndex = -1;\n    this.el = el;\n    this.groupTreeitem = group;\n    this.label = el.textContent?.trim() ?? '';\n    this.tree = treeObj;\n    this.depth = (group?.depth || 0) + 1;\n    this.index = 0;\n\n    const parent = el.parentElement;\n    if (parent?.tagName.toLowerCase() === 'li') {\n      parent?.setAttribute('role', 'none');\n    }\n    el.setAttribute('aria-level', this.depth + '');\n    if (el.getAttribute('aria-label')) {\n      this.label = el?.getAttribute('aria-label')?.trim() ?? '';\n    }\n\n    this.isExpandable = false;\n    this.isVisible = false;\n    this.isInGroup = !!group;\n\n    let curr = el.nextElementSibling;\n    while (curr) {\n      if (curr.tagName.toLowerCase() == 'ul') {\n        const groupId = `${group?.label ?? ''} nav group ${this.label}`.replace(/[\\W_]+/g, '_');\n        el.setAttribute('aria-owns', groupId);\n        el.setAttribute('aria-expanded', 'false');\n        curr.setAttribute('role', 'group');\n        curr.setAttribute('id', groupId);\n        this.isExpandable = true;\n        break;\n      }\n\n      curr = curr.nextElementSibling;\n    }\n    this.init();\n  }\n\n  private init() {\n    this.el.tabIndex = -1;\n    if (!this.el.getAttribute('role')) {\n      this.el.setAttribute('role', 'treeitem');\n    }\n    this.el.addEventListener('keydown', this.handleKeydown.bind(this));\n    this.el.addEventListener('click', this.handleClick.bind(this));\n    this.el.addEventListener('focus', this.handleFocus.bind(this));\n    this.el.addEventListener('blur', this.handleBlur.bind(this));\n  }\n\n  isExpanded() {\n    if (this.isExpandable) {\n      return this.el.getAttribute('aria-expanded') === 'true';\n    }\n\n    return false;\n  }\n\n  isSelected() {\n    return this.el.getAttribute('aria-selected') === 'true';\n  }\n\n  private handleClick(event: MouseEvent) {\n    // only process click events that directly happened on this treeitem\n    if (event.target !== this.el && event.target !== this.el.firstElementChild) {\n      return;\n    }\n    if (this.isExpandable) {\n      if (this.isExpanded() && this.isSelected()) {\n        this.tree.collapseTreeitem(this);\n      } else {\n        this.tree.expandTreeitem(this);\n      }\n      event.stopPropagation();\n    }\n    this.tree.setSelected(this);\n  }\n\n  private handleFocus() {\n    let el = this.el;\n    if (this.isExpandable) {\n      el = (el.firstElementChild as HTMLElement) ?? el;\n    }\n    el.classList.add('focus');\n  }\n\n  private handleBlur() {\n    let el = this.el;\n    if (this.isExpandable) {\n      el = (el.firstElementChild as HTMLElement) ?? el;\n    }\n    el.classList.remove('focus');\n  }\n\n  private handleKeydown(event: KeyboardEvent) {\n    if (event.altKey || event.ctrlKey || event.metaKey) {\n      return;\n    }\n\n    let captured = false;\n    switch (event.key) {\n      case ' ':\n      case 'Enter':\n        if (this.isExpandable) {\n          if (this.isExpanded() && this.isSelected()) {\n            this.tree.collapseTreeitem(this);\n          } else {\n            this.tree.expandTreeitem(this);\n          }\n          captured = true;\n        } else {\n          event.stopPropagation();\n        }\n        this.tree.setSelected(this);\n        break;\n\n      case 'ArrowUp':\n        this.tree.setFocusToPreviousItem(this);\n        captured = true;\n        break;\n\n      case 'ArrowDown':\n        this.tree.setFocusToNextItem(this);\n        captured = true;\n        break;\n\n      case 'ArrowRight':\n        if (this.isExpandable) {\n          if (this.isExpanded()) {\n            this.tree.setFocusToNextItem(this);\n          } else {\n            this.tree.expandTreeitem(this);\n          }\n        }\n        captured = true;\n        break;\n\n      case 'ArrowLeft':\n        if (this.isExpandable && this.isExpanded()) {\n          this.tree.collapseTreeitem(this);\n          captured = true;\n        } else {\n          if (this.isInGroup) {\n            this.tree.setFocusToParentItem(this);\n            captured = true;\n          }\n        }\n        break;\n\n      case 'Home':\n        this.tree.setFocusToFirstItem();\n        captured = true;\n        break;\n\n      case 'End':\n        this.tree.setFocusToLastItem();\n        captured = true;\n        break;\n\n      default:\n        if (event.key.length === 1 && event.key.match(/\\S/)) {\n          if (event.key == '*') {\n            this.tree.expandAllSiblingItems(this);\n          } else {\n            this.tree.setFocusByFirstCharacter(this, event.key);\n          }\n          captured = true;\n        }\n        break;\n    }\n\n    if (captured) {\n      event.stopPropagation();\n      event.preventDefault();\n    }\n  }\n}\n\n// eslint-disable-next-line @typescript-eslint/no-explicit-any\nfunction debounce<T extends (...args: any[]) => any>(func: T, wait: number) {\n  let timeout: ReturnType<typeof setTimeout> | null;\n  return (...args: Parameters<T>) => {\n    const later = () => {\n      timeout = null;\n      func(...args);\n    };\n    if (timeout) {\n      clearTimeout(timeout);\n    }\n    timeout = setTimeout(later, wait);\n  };\n}\n", "/**\n * @license\n * Copyright 2021 The Go Authors. All rights reserved.\n * Use of this source code is governed by a BSD-style\n * license that can be found in the LICENSE file.\n */\n\nimport { CarouselController } from '../../shared/carousel/carousel';\nimport { SelectNavController, makeSelectNav } from '../../shared/outline/select';\nimport { TreeNavController } from '../../shared/outline/tree';\n\nwindow.addEventListener('load', () => {\n  const tree = document.querySelector<HTMLElement>('.js-tree');\n  if (tree) {\n    const treeCtrl = new TreeNavController(tree);\n    const select = makeSelectNav(treeCtrl);\n    document.querySelector('.js-mainNavMobile')?.appendChild(select);\n  }\n\n  const guideTree = document.querySelector<HTMLElement>('.Outline .js-tree');\n  if (guideTree) {\n    const treeCtrl = new TreeNavController(guideTree);\n    const select = makeSelectNav(treeCtrl);\n    document.querySelector('.Outline .js-select')?.appendChild(select);\n  }\n\n  for (const el of document.querySelectorAll('.js-toggleTheme')) {\n    el.addEventListener('click', e => {\n      const value = (e.currentTarget as HTMLButtonElement).getAttribute('data-value');\n      document.documentElement.setAttribute('data-theme', String(value));\n    });\n  }\n  for (const el of document.querySelectorAll('.js-toggleLayout')) {\n    el.addEventListener('click', e => {\n      const value = (e.currentTarget as HTMLButtonElement).getAttribute('data-value');\n      document.documentElement.setAttribute('data-layout', String(value));\n    });\n  }\n\n  for (const el of document.querySelectorAll<HTMLSelectElement>('.js-selectNav')) {\n    new SelectNavController(el);\n  }\n\n  for (const el of document.querySelectorAll<HTMLSelectElement>('.js-carousel')) {\n    new CarouselController(el);\n  }\n});\n\ncustomElements.define(\n  'go-color',\n  class extends HTMLElement {\n    constructor() {\n      super();\n      this.style.setProperty('display', 'contents');\n      // The current version of TypeScript is not aware of String.replaceAll.\n      // eslint-disable-next-line @typescript-eslint/no-explicit-any\n      const name = this.id as any;\n      this.removeAttribute('id');\n      this.innerHTML = `\n        <div style=\"--color: var(${name});\" class=\"GoColor-circle\"></div>\n        <span>\n          <div id=\"${name}\" class=\"go-textLabel GoColor-title\">${name\n        .replace('--color-', '')\n        .replaceAll('-', ' ')}</div>\n          <pre class=\"StringifyElement-markup\">var(${name})</pre>\n        </span>\n      `;\n      this.querySelector('pre')?.addEventListener('click', () => {\n        navigator.clipboard.writeText(`var(${name})`);\n      });\n    }\n  }\n);\n\ncustomElements.define(\n  'go-icon',\n  class extends HTMLElement {\n    constructor() {\n      super();\n      this.style.setProperty('display', 'contents');\n      // The current version of TypeScript is not aware of String.replaceAll.\n      // eslint-disable-next-line @typescript-eslint/no-explicit-any\n      const name = this.getAttribute('name') as any;\n      this.innerHTML = `<p id=\"icon-${name}\" class=\"go-textLabel GoIcon-title\">${name.replaceAll(\n        '_',\n        ' '\n      )}</p>\n        <stringify-el>\n          <img class=\"go-Icon\" height=\"24\" width=\"24\" src=\"/static/shared/icon/${name}_gm_grey_24dp.svg\" alt=\"\">\n        </stringify-el>\n      `;\n    }\n  }\n);\n\ncustomElements.define(\n  'clone-el',\n  class extends HTMLElement {\n    constructor() {\n      super();\n      this.style.setProperty('display', 'contents');\n      const selector = this.getAttribute('selector');\n      if (!selector) return;\n      const html = '    ' + document.querySelector(selector)?.outerHTML;\n      this.innerHTML = `\n        <stringify-el collapsed>${html}</stringify-el>\n      `;\n    }\n  }\n);\n\ncustomElements.define(\n  'stringify-el',\n  class extends HTMLElement {\n    constructor() {\n      super();\n      this.style.setProperty('display', 'contents');\n      const html = this.innerHTML;\n      const idAttr = this.id ? ` id=\"${this.id}\"` : '';\n      this.removeAttribute('id');\n      let markup = `<pre class=\"StringifyElement-markup\">` + escape(trim(html)) + `</pre>`;\n      if (this.hasAttribute('collapsed')) {\n        markup = `<details class=\"StringifyElement-details\"><summary>Markup</summary>${markup}</details>`;\n      }\n      this.innerHTML = `<span${idAttr}>${html}</span>${markup}`;\n      this.querySelector('pre')?.addEventListener('click', () => {\n        navigator.clipboard.writeText(html);\n      });\n    }\n  }\n);\n\n/**\n * trim removes excess indentation from html markup by\n * measuring the number of spaces in the first line of\n * the given string and removing that number of spaces\n * from the beginning of each line.\n */\nfunction trim(html: string) {\n  return html\n    .split('\\n')\n    .reduce<{ result: string[]; start: number }>(\n      (acc, val) => {\n        if (acc.result.length === 0) {\n          const start = val.indexOf('<');\n          acc.start = start === -1 ? 0 : start;\n        }\n        val = val.slice(acc.start);\n        if (val) {\n          acc.result.push(val);\n        }\n        return acc;\n      },\n      { result: [], start: 0 }\n    )\n    .result.join('\\n');\n}\n\nfunction escape(html: string) {\n  // The current version of TypeScript is not aware of String.replaceAll.\n  // eslint-disable-next-line @typescript-eslint/no-explicit-any\n  return (html as any)?.replaceAll('<', '&lt;')?.replaceAll('>', '&gt;');\n}\n"],
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 }
diff --git a/static/frontend/styleguide/styleguide.min.css b/static/frontend/styleguide/styleguide.min.css
index 49579d1..4376c1d 100644
--- a/static/frontend/styleguide/styleguide.min.css
+++ b/static/frontend/styleguide/styleguide.min.css
@@ -5,13 +5,13 @@
  */
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 /*!
- * Copyright 2021 The Go Authors. All rights reserved.
- * Use of this source code is governed by a BSD-style
- * license that can be found in the LICENSE file.
- */
-/*!
 * Copyright 2019-2020 The Go Authors. All rights reserved.
 * Use of this source code is governed by a BSD-style
 * license that can be found in the LICENSE file.
 */
+/*!
+ * Copyright 2021 The Go Authors. All rights reserved.
+ * Use of this source code is governed by a BSD-style
+ * license that can be found in the LICENSE file.
+ */
 /*# sourceMappingURL=styleguide.min.css.map */
diff --git a/static/frontend/unit/main/main.js b/static/frontend/unit/main/main.js
index 30b6993..c28bb06 100644
--- a/static/frontend/unit/main/main.js
+++ b/static/frontend/unit/main/main.js
@@ -6,12 +6,6 @@
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p=class{constructor(e){this.el=e;this.handleResize=()=>{this.el.style.setProperty("--js-tree-height","100vh"),this.el.style.setProperty("--js-tree-height",this.el.clientHeight+"px")};this.treeitems=[],this.firstChars=[],this.firstTreeitem=null,this.lastTreeitem=null,this.observerCallbacks=[],this.init()}init(){this.handleResize(),window.addEventListener("resize",this.handleResize),this.findTreeItems(),this.updateVisibleTreeitems(),this.observeTargets(),this.firstTreeitem&&(this.firstTreeitem.el.tabIndex=0)}observeTargets(){this.addObserver(i=>{this.expandTreeitem(i),this.setSelected(i)});let e=new Map,t=new IntersectionObserver(i=>{for(let s of i)e.set(s.target.id,s.isIntersecting||s.intersectionRatio===1);for(let[s,r]of e)if(r){let l=this.treeitems.find(a=>{var h;return(h=a.el)==null?void 0:h.href.endsWith(`#${s}`)});if(l)for(let a of this.observerCallbacks)a(l);break}},{threshold:1,rootMargin:"-60px 0px 0px 0px"});for(let i of this.treeitems.map(s=>s.el.getAttribute("href")))if(i){let s=i.replace(window.location.origin,"").replace("/","").replace("#",""),r=document.getElementById(s);r&&t.observe(r)}}addObserver(e,t=200){this.observerCallbacks.push(w(e,t))}setFocusToNextItem(e){let t=null;for(let i=e.index+1;i<this.treeitems.length;i++){let s=this.treeitems[i];if(s.isVisible){t=s;break}}t&&this.setFocusToItem(t)}setFocusToPreviousItem(e){let t=null;for(let i=e.index-1;i>-1;i--){let s=this.treeitems[i];if(s.isVisible){t=s;break}}t&&this.setFocusToItem(t)}setFocusToParentItem(e){e.groupTreeitem&&this.setFocusToItem(e.groupTreeitem)}setFocusToFirstItem(){this.firstTreeitem&&this.setFocusToItem(this.firstTreeitem)}setFocusToLastItem(){this.lastTreeitem&&this.setFocusToItem(this.lastTreeitem)}setSelected(e){var t;for(let i of this.el.querySelectorAll('[aria-expanded="true"]'))i!==e.el&&((t=i.nextElementSibling)!=null&&t.contains(e.el)||i.setAttribute("aria-expanded","false"));for(let i of this.el.querySelectorAll("[aria-selected]"))i!==e.el&&i.setAttribute("aria-selected","false");e.el.setAttribute("aria-selected","true"),this.updateVisibleTreeitems(),this.setFocusToItem(e,!1)}expandTreeitem(e){let t=e;for(;t;)t.isExpandable&&t.el.setAttribute("aria-expanded","true"),t=t.groupTreeitem;this.updateVisibleTreeitems()}expandAllSiblingItems(e){for(let t of this.treeitems)t.groupTreeitem===e.groupTreeitem&&t.isExpandable&&this.expandTreeitem(t)}collapseTreeitem(e){let t=null;e.isExpanded()?t=e:t=e.groupTreeitem,t&&(t.el.setAttribute("aria-expanded","false"),this.updateVisibleTreeitems(),this.setFocusToItem(t))}setFocusByFirstCharacter(e,t){let i,s;t=t.toLowerCase(),i=e.index+1,i===this.treeitems.length&&(i=0),s=this.getIndexFirstChars(i,t),s===-1&&(s=this.getIndexFirstChars(0,t)),s>-1&&this.setFocusToItem(this.treeitems[s])}findTreeItems(){let e=(t,i)=>{let s=i,r=t.firstElementChild;for(;r;)(r.tagName==="A"||r.tagName==="SPAN")&&(s=new b(r,this,i),this.treeitems.push(s),this.firstChars.push(s.label.substring(0,1).toLowerCase())),r.firstElementChild&&e(r,s),r=r.nextElementSibling};e(this.el,null),this.treeitems.map((t,i)=>t.index=i)}updateVisibleTreeitems(){this.firstTreeitem=this.treeitems[0];for(let e of this.treeitems){let t=e.groupTreeitem;for(e.isVisible=!0;t&&t.el!==this.el;)t.isExpanded()||(e.isVisible=!1),t=t.groupTreeitem;e.isVisible&&(this.lastTreeitem=e)}}setFocusToItem(e,t=!0){e.el.tabIndex=0,t&&e.el.focus();for(let i of this.treeitems)i!==e&&(i.el.tabIndex=-1)}getIndexFirstChars(e,t){for(let i=e;i<this.firstChars.length;i++)if(this.treeitems[i].isVisible&&t===this.firstChars[i])return i;return-1}},b=class{constructor(e,t,i){var l,a,h,c,g;e.tabIndex=-1,this.el=e,this.groupTreeitem=i,this.label=(a=(l=e.textContent)==null?void 0:l.trim())!=null?a:"",this.tree=t,this.depth=((i==null?void 0:i.depth)||0)+1,this.index=0;let s=e.parentElement;(s==null?void 0:s.tagName.toLowerCase())==="li"&&(s==null||s.setAttribute("role","none")),e.setAttribute("aria-level",this.depth+""),e.getAttribute("aria-label")&&(this.label=(c=(h=e==null?void 0:e.getAttribute("aria-label"))==null?void 0:h.trim())!=null?c:""),this.isExpandable=!1,this.isVisible=!1,this.isInGroup=!!i;let r=e.nextElementSibling;for(;r;){if(r.tagName.toLowerCase()=="ul"){let y=`${(g=i==null?void 0:i.label)!=null?g:""} nav group 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e=this.el;this.isExpandable&&(e=(t=e.firstElementChild)!=null?t:e),e.classList.add("focus")}handleBlur(){var t;let e=this.el;this.isExpandable&&(e=(t=e.firstElementChild)!=null?t:e),e.classList.remove("focus")}handleKeydown(e){if(e.altKey||e.ctrlKey||e.metaKey)return;let t=!1;switch(e.key){case" ":case"Enter":this.isExpandable?(this.isExpanded()&&this.isSelected()?this.tree.collapseTreeitem(this):this.tree.expandTreeitem(this),t=!0):e.stopPropagation(),this.tree.setSelected(this);break;case"ArrowUp":this.tree.setFocusToPreviousItem(this),t=!0;break;case"ArrowDown":this.tree.setFocusToNextItem(this),t=!0;break;case"ArrowRight":this.isExpandable&&(this.isExpanded()?this.tree.setFocusToNextItem(this):this.tree.expandTreeitem(this)),t=!0;break;case"ArrowLeft":this.isExpandable&&this.isExpanded()?(this.tree.collapseTreeitem(this),t=!0):this.isInGroup&&(this.tree.setFocusToParentItem(this),t=!0);break;case"Home":this.tree.setFocusToFirstItem(),t=!0;break;case"End":this.tree.setFocusToLastItem(),t=!0;break;default:e.key.length===1&&e.key.match(/\S/)&&(e.key=="*"?this.tree.expandAllSiblingItems(this):this.tree.setFocusByFirstCharacter(this,e.key),t=!0);break}t&&(e.stopPropagation(),e.preventDefault())}};function w(n,e){let t;return(...i)=>{let 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o=document.querySelector(".js-readme"),v=document.querySelector(".js-readmeContent"),S=document.querySelector(".js-readmeOutline"),T=document.querySelectorAll(".js-readmeExpand"),k=document.querySelector(".js-readmeCollapse"),x=document.querySelector(".DocNavMobile-select");o&&v&&S&&T.length&&k&&(o.clientHeight>320&&(o==null||o.classList.remove("UnitReadme--expanded"),o==null||o.classList.add("UnitReadme--toggle")),window.location.hash.includes("readme")&&u(),x==null||x.addEventListener("change",n=>{n.target.value.startsWith("readme-")&&u()}),T.forEach(n=>n.addEventListener("click",e=>{e.preventDefault(),u(),o.scrollIntoView()})),k.addEventListener("click",n=>{n.preventDefault(),o.classList.remove("UnitReadme--expanded"),T[1]&&T[1].scrollIntoView({block:"center"})}),v.addEventListener("keyup",()=>{u()}),v.addEventListener("click",()=>{u()}),S.addEventListener("click",()=>{u()}),document.addEventListener("keydown",n=>{(n.ctrlKey||n.metaKey)&&n.key==="f"&&u()}));function u(){history.replaceState(null,"",`${location.pathname}#section-readme`),o==null||o.classList.add("UnitReadme--expanded")}function M(){var t;if(!location.hash)return;let n=document.getElementById(location.hash.slice(1)),e=(t=n==null?void 0:n.parentElement)==null?void 0:t.parentElement;(e==null?void 0:e.nodeName)==="DETAILS"&&(e.open=!0)}M();window.addEventListener("hashchange",()=>M());document.querySelectorAll(".js-buildContextSelect").forEach(n=>{n.addEventListener("change",e=>{window.location.search=`?GOOS=${e.target.value}`})});
 /*!
  * @license
- * Copyright 2020 The Go Authors. All rights reserved.
- * Use of this source code is governed by a BSD-style
- * license that can be found in the LICENSE file.
- */
-/*!
- * @license
  * Copyright 2021 The Go Authors. All rights reserved.
  * Use of this source code is governed by a BSD-style
  * license that can be found in the LICENSE file.
@@ -22,4 +16,10 @@
  * Use of this source code is governed by a BSD-style
  * license that can be found in the LICENSE file.
  */
+/*!
+ * @license
+ * Copyright 2020 The Go Authors. All rights reserved.
+ * Use of this source code is governed by a BSD-style
+ * license that can be found in the LICENSE file.
+ */
 //# sourceMappingURL=main.js.map
diff --git a/static/frontend/unit/main/main.js.map b/static/frontend/unit/main/main.js.map
index a867a36..1dc2f68 100644
--- a/static/frontend/unit/main/main.js.map
+++ b/static/frontend/unit/main/main.js.map
@@ -2,6 +2,6 @@
   "version": 3,
   "sources": ["../../../shared/playground/playground.ts", "../../../shared/outline/select.ts", "../../../shared/outline/tree.ts", "../../../shared/table/table.ts", "main.ts"],
   "sourcesContent": ["/*!\n * @license\n * Copyright 2021 The Go Authors. All rights reserved.\n * Use of this source code is governed by a BSD-style\n * license that can be found in the LICENSE file.\n */\n\n// This file implements the playground implementation of the documentation\n// page. The playground involves a \"play\" button that allows you to open up\n// a new link to play.golang.org using the example code.\n\n// The CSS is in static/frontend/unit/main/_doc.css\n\n/**\n * CSS classes used by PlaygroundExampleController\n */\nconst PlayExampleClassName = {\n  PLAY_HREF: '.js-exampleHref',\n  PLAY_CONTAINER: '.js-exampleContainer',\n  EXAMPLE_INPUT: '.Documentation-exampleCode',\n  EXAMPLE_OUTPUT: '.Documentation-exampleOutput',\n  EXAMPLE_ERROR: '.Documentation-exampleError',\n  PLAY_BUTTON: '.Documentation-examplePlayButton',\n  SHARE_BUTTON: '.Documentation-exampleShareButton',\n  FORMAT_BUTTON: '.Documentation-exampleFormatButton',\n  RUN_BUTTON: '.Documentation-exampleRunButton',\n};\n\n/**\n * This controller enables playground examples to expand their dropdown or\n * generate shareable Go Playground URLs.\n */\nexport class PlaygroundExampleController {\n  /**\n   * The anchor tag used to identify the container with an example href.\n   * There is only one in an example container div.\n   */\n  private readonly anchorEl: HTMLAnchorElement | null;\n\n  /**\n   * The error element\n   */\n  private readonly errorEl: Element | null;\n\n  /**\n   * Buttons that redirect to an example's playground, this element\n   * only exists in executable examples.\n   */\n  private readonly playButtonEl: Element | null;\n  private readonly shareButtonEl: Element | null;\n\n  /**\n   * Button that formats the code in an example's playground.\n   */\n  private readonly formatButtonEl: Element | null;\n\n  /**\n   * Button that runs the code in an example's playground, this element\n   * only exists in executable examples.\n   */\n  private readonly runButtonEl: Element | null;\n\n  /**\n   * The executable code of an example.\n   */\n  private readonly inputEl: HTMLTextAreaElement | null;\n\n  /**\n   * The output of the given example code. This only exists if the\n   * author of the package provides an output for this example.\n   */\n  private readonly outputEl: Element | null;\n\n  /**\n   * @param exampleEl The div that contains playground content for the given example.\n   */\n  constructor(private readonly exampleEl: HTMLDetailsElement) {\n    this.exampleEl = exampleEl;\n    this.anchorEl = exampleEl.querySelector('a');\n    this.errorEl = exampleEl.querySelector(PlayExampleClassName.EXAMPLE_ERROR);\n    this.playButtonEl = exampleEl.querySelector(PlayExampleClassName.PLAY_BUTTON);\n    this.shareButtonEl = exampleEl.querySelector(PlayExampleClassName.SHARE_BUTTON);\n    this.formatButtonEl = exampleEl.querySelector(PlayExampleClassName.FORMAT_BUTTON);\n    this.runButtonEl = exampleEl.querySelector(PlayExampleClassName.RUN_BUTTON);\n    this.inputEl = this.makeTextArea(exampleEl.querySelector(PlayExampleClassName.EXAMPLE_INPUT));\n    this.outputEl = exampleEl.querySelector(PlayExampleClassName.EXAMPLE_OUTPUT);\n\n    // This is legacy listener to be replaced the listener for shareButtonEl.\n    this.playButtonEl?.addEventListener('click', () => this.handleShareButtonClick());\n    this.shareButtonEl?.addEventListener('click', () => this.handleShareButtonClick());\n    this.formatButtonEl?.addEventListener('click', () => this.handleFormatButtonClick());\n    this.runButtonEl?.addEventListener('click', () => this.handleRunButtonClick());\n\n    if (!this.inputEl) return;\n\n    this.resize();\n    this.inputEl.addEventListener('keyup', () => this.resize());\n    this.inputEl.addEventListener('keydown', e => this.onKeydown(e));\n  }\n\n  /**\n   * Replace the pre element with a textarea. The examples are initially rendered\n   * as pre elements so they're fully visible when JS is disabled.\n   */\n  makeTextArea(el: Element | null): HTMLTextAreaElement {\n    const t = document.createElement('textarea');\n    t.classList.add('Documentation-exampleCode', 'code');\n    t.spellcheck = false;\n    t.value = el?.textContent ?? '';\n    el?.parentElement?.replaceChild(t, el);\n    return t;\n  }\n\n  /**\n   * Retrieve the hash value of the anchor element.\n   */\n  getAnchorHash(): string | undefined {\n    return this.anchorEl?.hash;\n  }\n\n  /**\n   * Expands the current playground example.\n   */\n  expand(): void {\n    this.exampleEl.open = true;\n  }\n\n  /**\n   * Resizes the input element to accommodate the amount of text present.\n   */\n  private resize(): void {\n    if (this.inputEl?.value) {\n      const numLineBreaks = (this.inputEl.value.match(/\\n/g) || []).length;\n      // min-height + lines x line-height + padding + border\n      this.inputEl.style.height = `${(20 + numLineBreaks * 20 + 12 + 2) / 16}rem`;\n    }\n  }\n\n  /**\n   * Handler to override keyboard behavior in the playground's\n   * textarea element.\n   *\n   * Tab key inserts tabs into the example playground instead of\n   * switching to the next interactive element.\n   * @param e input element keyboard event.\n   */\n  private onKeydown(e: KeyboardEvent) {\n    if (e.key === 'Tab') {\n      document.execCommand('insertText', false, '\\t');\n      e.preventDefault();\n    }\n  }\n\n  /**\n   * Changes the text of the example's input box.\n   */\n  private setInputText(output: string) {\n    if (this.inputEl) {\n      this.inputEl.value = output;\n    }\n  }\n\n  /**\n   * Changes the text of the example's output box.\n   */\n  private setOutputText(output: string) {\n    if (this.outputEl) {\n      this.outputEl.textContent = output;\n    }\n  }\n\n  private setOutputHTML(output: string) {\n    if (this.outputEl) {\n      this.outputEl.innerHTML = output;\n    }\n  }\n\n  /**\n   * Sets the error message text and overwrites\n   * output box to indicate a failed response.\n   */\n  private setErrorText(err: string) {\n    if (this.errorEl) {\n      this.errorEl.textContent = err;\n    }\n    this.setOutputText('An error has occurred\u2026');\n  }\n\n  private getCodeWithModFile(): string {\n    let codeWithModFile = this.inputEl?.value ?? '';\n    const moduleVars = document.querySelector<HTMLDivElement>('.js-playgroundVars')?.dataset ?? {};\n    if (moduleVars.modulepath !== 'std') {\n      codeWithModFile = codeWithModFile.concat(`\n-- go.mod --\nmodule play.ground\n\nrequire ${moduleVars.modulepath} ${moduleVars.version}\n`);\n    }\n\n    return codeWithModFile;\n  }\n\n  /**\n   * Opens a new window to play.golang.org using the\n   * example snippet's code in the playground.\n   */\n  private handleShareButtonClick() {\n    const PLAYGROUND_BASE_URL = 'https://play.golang.org/p/';\n\n    this.setOutputText('Waiting for remote server\u2026');\n\n    fetch('/play/share', {\n      method: 'POST',\n      body: this.getCodeWithModFile(),\n    })\n      .then(res => res.text())\n      .then(shareId => {\n        const href = PLAYGROUND_BASE_URL + shareId;\n        this.setOutputHTML(`<a href=\"${href}\">${href}</a>`);\n        window.open(href);\n      })\n      .catch(err => {\n        this.setErrorText(err);\n      });\n  }\n\n  /**\n   * Runs gofmt on the example snippet in the playground.\n   */\n  private handleFormatButtonClick() {\n    this.setOutputText('Waiting for remote server\u2026');\n    const body = new FormData();\n    body.append('body', this.inputEl?.value ?? '');\n\n    fetch('/play/fmt', {\n      method: 'POST',\n      body: body,\n    })\n      .then(res => res.json())\n      .then(({ Body, Error }) => {\n        this.setOutputText(Error || 'Done.');\n        if (Body) {\n          this.setInputText(Body);\n          this.resize();\n        }\n      })\n      .catch(err => {\n        this.setErrorText(err);\n      });\n  }\n\n  /**\n   * Runs the code snippet in the example playground.\n   */\n  private handleRunButtonClick() {\n    this.setOutputText('Waiting for remote server\u2026');\n\n    fetch('/play/compile', {\n      method: 'POST',\n      body: JSON.stringify({ body: this.getCodeWithModFile(), version: 2 }),\n    })\n      .then(res => res.json())\n      .then(async ({ Events, Errors }) => {\n        this.setOutputText(Errors || '');\n        for (const e of Events || []) {\n          this.setOutputText(e.Message);\n          await new Promise(resolve => setTimeout(resolve, e.Delay / 1000000));\n        }\n      })\n      .catch(err => {\n        this.setErrorText(err);\n      });\n  }\n}\n\nexport function initPlaygrounds(): void {\n  const exampleHashRegex = location.hash.match(/^#(example-.*)$/);\n  if (exampleHashRegex) {\n    const exampleHashEl = document.getElementById(exampleHashRegex[1]) as HTMLDetailsElement;\n    if (exampleHashEl) {\n      exampleHashEl.open = true;\n    }\n  }\n\n  // We use a spread operator to convert a nodelist into an array of elements.\n  const exampleHrefs = [\n    ...document.querySelectorAll<HTMLAnchorElement>(PlayExampleClassName.PLAY_HREF),\n  ];\n\n  /**\n   * Sometimes exampleHrefs and playContainers are in different order, so we\n   * find an exampleHref from a common hash.\n   * @param playContainer - playground container\n   */\n  const findExampleHash = (playContainer: PlaygroundExampleController) =>\n    exampleHrefs.find(ex => {\n      return ex.hash === playContainer.getAnchorHash();\n    });\n\n  for (const el of document.querySelectorAll(PlayExampleClassName.PLAY_CONTAINER)) {\n    // There should be the same amount of hrefs referencing examples as example containers.\n    const playContainer = new PlaygroundExampleController(el as HTMLDetailsElement);\n    const exampleHref = findExampleHash(playContainer);\n    if (exampleHref) {\n      exampleHref.addEventListener('click', () => {\n        playContainer.expand();\n      });\n    } else {\n      console.warn('example href not found');\n    }\n  }\n}\n", "/**\n * @license\n * Copyright 2021 The Go Authors. All rights reserved.\n * Use of this source code is governed by a BSD-style\n * license that can be found in the LICENSE file.\n */\n\nimport { TreeNavController } from './tree.js';\n\nexport class SelectNavController {\n  constructor(private el: Element) {\n    this.el.addEventListener('change', e => {\n      const target = e.target as HTMLSelectElement;\n      let href = target.value;\n      if (!target.value.startsWith('/')) {\n        href = '/' + href;\n      }\n      window.location.href = href;\n    });\n  }\n}\n\nexport function makeSelectNav(tree: TreeNavController): HTMLLabelElement {\n  const label = document.createElement('label');\n  label.classList.add('go-Label');\n  label.setAttribute('aria-label', 'Menu');\n  const select = document.createElement('select');\n  select.classList.add('go-Select', 'js-selectNav');\n  label.appendChild(select);\n  const outline = document.createElement('optgroup');\n  outline.label = 'Outline';\n  select.appendChild(outline);\n  const groupMap: Record<string, HTMLOptGroupElement> = {};\n  let group: HTMLOptGroupElement;\n  for (const t of tree.treeitems) {\n    if (Number(t.depth) > 4) continue;\n    if (t.groupTreeitem) {\n      group = groupMap[t.groupTreeitem.label];\n      if (!group) {\n        group = groupMap[t.groupTreeitem.label] = document.createElement('optgroup');\n        group.label = t.groupTreeitem.label;\n        select.appendChild(group);\n      }\n    } else {\n      group = outline;\n    }\n    const o = document.createElement('option');\n    o.label = t.label;\n    o.textContent = t.label;\n    o.value = (t.el as HTMLAnchorElement).href.replace(window.location.origin, '').replace('/', '');\n    group.appendChild(o);\n  }\n  tree.addObserver(t => {\n    const hash = (t.el as HTMLAnchorElement).hash;\n    const value = select.querySelector<HTMLOptionElement>(`[value$=\"${hash}\"]`)?.value;\n    if (value) {\n      select.value = value;\n    }\n  }, 50);\n  return label;\n}\n", "/**\n * @license\n * Copyright 2021 The Go Authors. All rights reserved.\n * Use of this source code is governed by a BSD-style\n * license that can be found in the LICENSE file.\n */\n\n/**\n * TreeNavController is the navigation tree component of the documentation page.\n * It adds accessiblity attributes to a tree, observes the heading elements\n * focus the topmost link for headings visible on the page, and implements the\n * WAI-ARIA Treeview Design Pattern with full\n * [keyboard support](https://www.w3.org/TR/wai-aria-practices/examples/treeview/treeview-2/treeview-2a.html#kbd_label).\n */\nexport class TreeNavController {\n  treeitems: TreeItem[];\n\n  /**\n   * firstChars is the first character of each treeitem in the same order\n   * as this.treeitems. We use this array to set focus by character when\n   * navigating the tree with a keyboard.\n   */\n  private firstChars: string[];\n  private firstTreeitem: TreeItem | null;\n  private lastTreeitem: TreeItem | null;\n  private observerCallbacks: ((t: TreeItem) => void)[];\n\n  constructor(private el: HTMLElement) {\n    this.treeitems = [];\n    this.firstChars = [];\n    this.firstTreeitem = null;\n    this.lastTreeitem = null;\n    this.observerCallbacks = [];\n    this.init();\n  }\n\n  private init(): void {\n    this.handleResize();\n    window.addEventListener('resize', this.handleResize);\n    this.findTreeItems();\n    this.updateVisibleTreeitems();\n    this.observeTargets();\n    if (this.firstTreeitem) {\n      this.firstTreeitem.el.tabIndex = 0;\n    }\n  }\n\n  private handleResize = (): void => {\n    this.el.style.setProperty('--js-tree-height', '100vh');\n    this.el.style.setProperty('--js-tree-height', this.el.clientHeight + 'px');\n  };\n\n  private observeTargets() {\n    this.addObserver(treeitem => {\n      this.expandTreeitem(treeitem);\n      this.setSelected(treeitem);\n      // TODO: Fix scroll issue in https://golang.org/issue/47450.\n      // treeitem.el.scrollIntoView({ block: 'nearest' });\n    });\n\n    const targets = new Map<string, boolean>();\n    const observer = new IntersectionObserver(\n      entries => {\n        for (const entry of entries) {\n          targets.set(entry.target.id, entry.isIntersecting || entry.intersectionRatio === 1);\n        }\n        for (const [id, isIntersecting] of targets) {\n          if (isIntersecting) {\n            const active = this.treeitems.find(t =>\n              (t.el as HTMLAnchorElement)?.href.endsWith(`#${id}`)\n            );\n            if (active) {\n              for (const fn of this.observerCallbacks) {\n                fn(active);\n              }\n            }\n            break;\n          }\n        }\n      },\n      {\n        threshold: 1.0,\n        rootMargin: '-60px 0px 0px 0px',\n      }\n    );\n\n    for (const href of this.treeitems.map(t => t.el.getAttribute('href'))) {\n      if (href) {\n        const id = href.replace(window.location.origin, '').replace('/', '').replace('#', '');\n        const target = document.getElementById(id);\n        if (target) {\n          observer.observe(target);\n        }\n      }\n    }\n  }\n\n  addObserver(fn: (t: TreeItem) => void, delay = 200): void {\n    this.observerCallbacks.push(debounce(fn, delay));\n  }\n\n  setFocusToNextItem(currentItem: TreeItem): void {\n    let nextItem = null;\n    for (let i = currentItem.index + 1; i < this.treeitems.length; i++) {\n      const ti = this.treeitems[i];\n      if (ti.isVisible) {\n        nextItem = ti;\n        break;\n      }\n    }\n    if (nextItem) {\n      this.setFocusToItem(nextItem);\n    }\n  }\n\n  setFocusToPreviousItem(currentItem: TreeItem): void {\n    let prevItem = null;\n    for (let i = currentItem.index - 1; i > -1; i--) {\n      const ti = this.treeitems[i];\n      if (ti.isVisible) {\n        prevItem = ti;\n        break;\n      }\n    }\n    if (prevItem) {\n      this.setFocusToItem(prevItem);\n    }\n  }\n\n  setFocusToParentItem(currentItem: TreeItem): void {\n    if (currentItem.groupTreeitem) {\n      this.setFocusToItem(currentItem.groupTreeitem);\n    }\n  }\n\n  setFocusToFirstItem(): void {\n    this.firstTreeitem && this.setFocusToItem(this.firstTreeitem);\n  }\n\n  setFocusToLastItem(): void {\n    this.lastTreeitem && this.setFocusToItem(this.lastTreeitem);\n  }\n\n  setSelected(currentItem: TreeItem): void {\n    for (const l1 of this.el.querySelectorAll('[aria-expanded=\"true\"]')) {\n      if (l1 === currentItem.el) continue;\n      if (!l1.nextElementSibling?.contains(currentItem.el)) {\n        l1.setAttribute('aria-expanded', 'false');\n      }\n    }\n    for (const l1 of this.el.querySelectorAll('[aria-selected]')) {\n      if (l1 !== currentItem.el) {\n        l1.setAttribute('aria-selected', 'false');\n      }\n    }\n    currentItem.el.setAttribute('aria-selected', 'true');\n    this.updateVisibleTreeitems();\n    this.setFocusToItem(currentItem, false);\n  }\n\n  expandTreeitem(treeitem: TreeItem): void {\n    let currentItem: TreeItem | null = treeitem;\n    while (currentItem) {\n      if (currentItem.isExpandable) {\n        currentItem.el.setAttribute('aria-expanded', 'true');\n      }\n      currentItem = currentItem.groupTreeitem;\n    }\n    this.updateVisibleTreeitems();\n  }\n\n  expandAllSiblingItems(currentItem: TreeItem): void {\n    for (const ti of this.treeitems) {\n      if (ti.groupTreeitem === currentItem.groupTreeitem && ti.isExpandable) {\n        this.expandTreeitem(ti);\n      }\n    }\n  }\n\n  collapseTreeitem(currentItem: TreeItem): void {\n    let groupTreeitem = null;\n\n    if (currentItem.isExpanded()) {\n      groupTreeitem = currentItem;\n    } else {\n      groupTreeitem = currentItem.groupTreeitem;\n    }\n\n    if (groupTreeitem) {\n      groupTreeitem.el.setAttribute('aria-expanded', 'false');\n      this.updateVisibleTreeitems();\n      this.setFocusToItem(groupTreeitem);\n    }\n  }\n\n  setFocusByFirstCharacter(currentItem: TreeItem, char: string): void {\n    let start: number, index: number;\n    char = char.toLowerCase();\n\n    // Get start index for search based on position of currentItem\n    start = currentItem.index + 1;\n    if (start === this.treeitems.length) {\n      start = 0;\n    }\n\n    // Check remaining slots in the menu\n    index = this.getIndexFirstChars(start, char);\n\n    // If not found in remaining slots, check from beginning\n    if (index === -1) {\n      index = this.getIndexFirstChars(0, char);\n    }\n\n    // If match was found...\n    if (index > -1) {\n      this.setFocusToItem(this.treeitems[index]);\n    }\n  }\n\n  private findTreeItems() {\n    const findItems = (el: HTMLElement, group: TreeItem | null) => {\n      let ti = group;\n      let curr = el.firstElementChild as HTMLElement;\n      while (curr) {\n        if (curr.tagName === 'A' || curr.tagName === 'SPAN') {\n          ti = new TreeItem(curr, this, group);\n          this.treeitems.push(ti);\n          this.firstChars.push(ti.label.substring(0, 1).toLowerCase());\n        }\n        if (curr.firstElementChild) {\n          findItems(curr, ti);\n        }\n        curr = curr.nextElementSibling as HTMLElement;\n      }\n    };\n    findItems(this.el as HTMLElement, null);\n    this.treeitems.map((ti, idx) => (ti.index = idx));\n  }\n\n  private updateVisibleTreeitems(): void {\n    this.firstTreeitem = this.treeitems[0];\n\n    for (const ti of this.treeitems) {\n      let parent = ti.groupTreeitem;\n      ti.isVisible = true;\n      while (parent && parent.el !== this.el) {\n        if (!parent.isExpanded()) {\n          ti.isVisible = false;\n        }\n        parent = parent.groupTreeitem;\n      }\n      if (ti.isVisible) {\n        this.lastTreeitem = ti;\n      }\n    }\n  }\n\n  private setFocusToItem(treeitem: TreeItem, focusEl = true) {\n    treeitem.el.tabIndex = 0;\n    if (focusEl) {\n      treeitem.el.focus();\n    }\n    for (const ti of this.treeitems) {\n      if (ti !== treeitem) {\n        ti.el.tabIndex = -1;\n      }\n    }\n  }\n\n  private getIndexFirstChars(startIndex: number, char: string): number {\n    for (let i = startIndex; i < this.firstChars.length; i++) {\n      if (this.treeitems[i].isVisible && char === this.firstChars[i]) {\n        return i;\n      }\n    }\n    return -1;\n  }\n}\n\nclass TreeItem {\n  el: HTMLElement;\n  groupTreeitem: TreeItem | null;\n  label: string;\n  isExpandable: boolean;\n  isVisible: boolean;\n  depth: number;\n  index: number;\n\n  private tree: TreeNavController;\n  private isInGroup: boolean;\n\n  constructor(el: HTMLElement, treeObj: TreeNavController, group: TreeItem | null) {\n    el.tabIndex = -1;\n    this.el = el;\n    this.groupTreeitem = group;\n    this.label = el.textContent?.trim() ?? '';\n    this.tree = treeObj;\n    this.depth = (group?.depth || 0) + 1;\n    this.index = 0;\n\n    const parent = el.parentElement;\n    if (parent?.tagName.toLowerCase() === 'li') {\n      parent?.setAttribute('role', 'none');\n    }\n    el.setAttribute('aria-level', this.depth + '');\n    if (el.getAttribute('aria-label')) {\n      this.label = el?.getAttribute('aria-label')?.trim() ?? '';\n    }\n\n    this.isExpandable = false;\n    this.isVisible = false;\n    this.isInGroup = !!group;\n\n    let curr = el.nextElementSibling;\n    while (curr) {\n      if (curr.tagName.toLowerCase() == 'ul') {\n        const groupId = `${group?.label ?? ''} nav group ${this.label}`.replace(/[\\W_]+/g, '_');\n        el.setAttribute('aria-owns', groupId);\n        el.setAttribute('aria-expanded', 'false');\n        curr.setAttribute('role', 'group');\n        curr.setAttribute('id', groupId);\n        this.isExpandable = true;\n        break;\n      }\n\n      curr = curr.nextElementSibling;\n    }\n    this.init();\n  }\n\n  private init() {\n    this.el.tabIndex = -1;\n    if (!this.el.getAttribute('role')) {\n      this.el.setAttribute('role', 'treeitem');\n    }\n    this.el.addEventListener('keydown', this.handleKeydown.bind(this));\n    this.el.addEventListener('click', this.handleClick.bind(this));\n    this.el.addEventListener('focus', this.handleFocus.bind(this));\n    this.el.addEventListener('blur', this.handleBlur.bind(this));\n  }\n\n  isExpanded() {\n    if (this.isExpandable) {\n      return this.el.getAttribute('aria-expanded') === 'true';\n    }\n\n    return false;\n  }\n\n  isSelected() {\n    return this.el.getAttribute('aria-selected') === 'true';\n  }\n\n  private handleClick(event: MouseEvent) {\n    // only process click events that directly happened on this treeitem\n    if (event.target !== this.el && event.target !== this.el.firstElementChild) {\n      return;\n    }\n    if (this.isExpandable) {\n      if (this.isExpanded() && this.isSelected()) {\n        this.tree.collapseTreeitem(this);\n      } else {\n        this.tree.expandTreeitem(this);\n      }\n      event.stopPropagation();\n    }\n    this.tree.setSelected(this);\n  }\n\n  private handleFocus() {\n    let el = this.el;\n    if (this.isExpandable) {\n      el = (el.firstElementChild as HTMLElement) ?? el;\n    }\n    el.classList.add('focus');\n  }\n\n  private handleBlur() {\n    let el = this.el;\n    if (this.isExpandable) {\n      el = (el.firstElementChild as HTMLElement) ?? el;\n    }\n    el.classList.remove('focus');\n  }\n\n  private handleKeydown(event: KeyboardEvent) {\n    if (event.altKey || event.ctrlKey || event.metaKey) {\n      return;\n    }\n\n    let captured = false;\n    switch (event.key) {\n      case ' ':\n      case 'Enter':\n        if (this.isExpandable) {\n          if (this.isExpanded() && this.isSelected()) {\n            this.tree.collapseTreeitem(this);\n          } else {\n            this.tree.expandTreeitem(this);\n          }\n          captured = true;\n        } else {\n          event.stopPropagation();\n        }\n        this.tree.setSelected(this);\n        break;\n\n      case 'ArrowUp':\n        this.tree.setFocusToPreviousItem(this);\n        captured = true;\n        break;\n\n      case 'ArrowDown':\n        this.tree.setFocusToNextItem(this);\n        captured = true;\n        break;\n\n      case 'ArrowRight':\n        if (this.isExpandable) {\n          if (this.isExpanded()) {\n            this.tree.setFocusToNextItem(this);\n          } else {\n            this.tree.expandTreeitem(this);\n          }\n        }\n        captured = true;\n        break;\n\n      case 'ArrowLeft':\n        if (this.isExpandable && this.isExpanded()) {\n          this.tree.collapseTreeitem(this);\n          captured = true;\n        } else {\n          if (this.isInGroup) {\n            this.tree.setFocusToParentItem(this);\n            captured = true;\n          }\n        }\n        break;\n\n      case 'Home':\n        this.tree.setFocusToFirstItem();\n        captured = true;\n        break;\n\n      case 'End':\n        this.tree.setFocusToLastItem();\n        captured = true;\n        break;\n\n      default:\n        if (event.key.length === 1 && event.key.match(/\\S/)) {\n          if (event.key == '*') {\n            this.tree.expandAllSiblingItems(this);\n          } else {\n            this.tree.setFocusByFirstCharacter(this, event.key);\n          }\n          captured = true;\n        }\n        break;\n    }\n\n    if (captured) {\n      event.stopPropagation();\n      event.preventDefault();\n    }\n  }\n}\n\n// eslint-disable-next-line @typescript-eslint/no-explicit-any\nfunction debounce<T extends (...args: any[]) => any>(func: T, wait: number) {\n  let timeout: ReturnType<typeof setTimeout> | null;\n  return (...args: Parameters<T>) => {\n    const later = () => {\n      timeout = null;\n      func(...args);\n    };\n    if (timeout) {\n      clearTimeout(timeout);\n    }\n    timeout = setTimeout(later, wait);\n  };\n}\n", "/*!\n * @license\n * Copyright 2020 The Go Authors. All rights reserved.\n * Use of this source code is governed by a BSD-style\n * license that can be found in the LICENSE file.\n */\n\n/**\n * Controller for a table element with expandable rows. Adds event listeners to\n * a toggle within a table row that controls visiblity of additional related\n * rows in the table.\n *\n * @example\n * ```typescript\n * import {ExpandableRowsTableController} from '/static/js/table';\n *\n * const el = document .querySelector<HTMLTableElement>('.js-myTableElement')\n * new ExpandableRowsTableController(el));\n * ```\n */\nexport class ExpandableRowsTableController {\n  private rows: HTMLTableRowElement[];\n  private toggles: HTMLButtonElement[];\n\n  /**\n   * Create a table controller.\n   * @param table - The table element to which the controller binds.\n   */\n  constructor(private table: HTMLTableElement, private toggleAll?: HTMLButtonElement | null) {\n    this.rows = Array.from(table.querySelectorAll<HTMLTableRowElement>('[data-aria-controls]'));\n    this.toggles = Array.from(this.table.querySelectorAll('[aria-expanded]'));\n    this.setAttributes();\n    this.attachEventListeners();\n    this.update();\n  }\n\n  /**\n   * setAttributes sets data-aria-* and data-id attributes to regular\n   * html attributes as a workaround for limitations from safehtml.\n   */\n  private setAttributes() {\n    for (const a of ['data-aria-controls', 'data-aria-labelledby', 'data-id']) {\n      this.table.querySelectorAll(`[${a}]`).forEach(t => {\n        t.setAttribute(a.replace('data-', ''), t.getAttribute(a) ?? '');\n        t.removeAttribute(a);\n      });\n    }\n  }\n\n  private attachEventListeners() {\n    this.rows.forEach(t => {\n      t.addEventListener('click', e => {\n        this.handleToggleClick(e);\n      });\n    });\n    this.toggleAll?.addEventListener('click', () => {\n      this.expandAllItems();\n    });\n\n    document.addEventListener('keydown', e => {\n      if ((e.ctrlKey || e.metaKey) && e.key === 'f') {\n        this.expandAllItems();\n      }\n    });\n  }\n\n  private handleToggleClick(e: MouseEvent) {\n    let target = e.currentTarget as HTMLTableRowElement | null;\n    if (!target?.hasAttribute('aria-expanded')) {\n      target = this.table.querySelector(\n        `button[aria-controls=\"${target?.getAttribute('aria-controls')}\"]`\n      );\n    }\n    const isExpanded = target?.getAttribute('aria-expanded') === 'true';\n    target?.setAttribute('aria-expanded', isExpanded ? 'false' : 'true');\n    e.stopPropagation();\n    this.update();\n  }\n\n  expandAllItems = (): void => {\n    this.toggles.map(t => t.setAttribute('aria-expanded', 'true'));\n    this.update();\n  };\n\n  private collapseAllItems = () => {\n    this.toggles.map(t => t.setAttribute('aria-expanded', 'false'));\n    this.update();\n  };\n\n  private update = () => {\n    this.updateVisibleItems();\n    setTimeout(() => this.updateGlobalToggle());\n  };\n\n  private updateVisibleItems() {\n    this.rows.map(t => {\n      const isExpanded = t?.getAttribute('aria-expanded') === 'true';\n      const rowIds = t?.getAttribute('aria-controls')?.trimEnd().split(' ');\n      rowIds?.map(id => {\n        const target = document.getElementById(`${id}`);\n        if (isExpanded) {\n          target?.classList.add('visible');\n          target?.classList.remove('hidden');\n        } else {\n          target?.classList.add('hidden');\n          target?.classList.remove('visible');\n        }\n      });\n    });\n  }\n\n  private updateGlobalToggle() {\n    if (!this.toggleAll) return;\n    if (this.rows.some(t => t.hasAttribute('aria-expanded'))) {\n      this.toggleAll.style.display = 'block';\n    }\n    const someCollapsed = this.toggles.some(el => el.getAttribute('aria-expanded') === 'false');\n    if (someCollapsed) {\n      this.toggleAll.innerText = 'Expand all';\n      this.toggleAll.onclick = this.expandAllItems;\n    } else {\n      this.toggleAll.innerText = 'Collapse all';\n      this.toggleAll.onclick = this.collapseAllItems;\n    }\n  }\n}\n", "import { initPlaygrounds } from 'static/shared/playground/playground';\nimport { SelectNavController, makeSelectNav } from 'static/shared/outline/select';\nimport { TreeNavController } from 'static/shared/outline/tree';\nimport { ExpandableRowsTableController } from 'static/shared/table/table';\n\ninitPlaygrounds();\n\nconst directories = document.querySelector<HTMLTableElement>('.js-expandableTable');\nif (directories) {\n  const table = new ExpandableRowsTableController(\n    directories,\n    document.querySelector<HTMLButtonElement>('.js-expandAllDirectories')\n  );\n  // Expand directories on page load with expand-directories query param.\n  if (window.location.search.includes('expand-directories')) {\n    table.expandAllItems();\n  }\n}\n\nconst treeEl = document.querySelector<HTMLElement>('.js-tree');\nif (treeEl) {\n  const treeCtrl = new TreeNavController(treeEl);\n  const select = makeSelectNav(treeCtrl);\n  const mobileNav = document.querySelector('.js-mainNavMobile');\n  if (mobileNav && mobileNav.firstElementChild) {\n    mobileNav?.replaceChild(select, mobileNav.firstElementChild);\n  }\n  if (select.firstElementChild) {\n    new SelectNavController(select.firstElementChild);\n  }\n}\n\n/**\n * Event handlers for expanding and collapsing the readme section.\n */\nconst readme = document.querySelector('.js-readme');\nconst readmeContent = document.querySelector('.js-readmeContent');\nconst readmeOutline = document.querySelector('.js-readmeOutline');\nconst readmeExpand = document.querySelectorAll('.js-readmeExpand');\nconst readmeCollapse = document.querySelector('.js-readmeCollapse');\nconst mobileNavSelect = document.querySelector<HTMLSelectElement>('.DocNavMobile-select');\nif (readme && readmeContent && readmeOutline && readmeExpand.length && readmeCollapse) {\n  if (readme.clientHeight > 320) {\n    readme?.classList.remove('UnitReadme--expanded');\n    readme?.classList.add('UnitReadme--toggle');\n  }\n  if (window.location.hash.includes('readme')) {\n    expandReadme();\n  }\n  mobileNavSelect?.addEventListener('change', e => {\n    if ((e.target as HTMLSelectElement).value.startsWith('readme-')) {\n      expandReadme();\n    }\n  });\n  readmeExpand.forEach(el =>\n    el.addEventListener('click', e => {\n      e.preventDefault();\n      expandReadme();\n      readme.scrollIntoView();\n    })\n  );\n  readmeCollapse.addEventListener('click', e => {\n    e.preventDefault();\n    readme.classList.remove('UnitReadme--expanded');\n    if (readmeExpand[1]) {\n      readmeExpand[1].scrollIntoView({ block: 'center' });\n    }\n  });\n  readmeContent.addEventListener('keyup', () => {\n    expandReadme();\n  });\n  readmeContent.addEventListener('click', () => {\n    expandReadme();\n  });\n  readmeOutline.addEventListener('click', () => {\n    expandReadme();\n  });\n  document.addEventListener('keydown', e => {\n    if ((e.ctrlKey || e.metaKey) && e.key === 'f') {\n      expandReadme();\n    }\n  });\n}\n\n/**\n * expandReadme expands the readme and adds the section-readme hash to the\n * URL so it stays expanded when navigating back from an external link.\n */\nfunction expandReadme() {\n  history.replaceState(null, '', `${location.pathname}#section-readme`);\n  readme?.classList.add('UnitReadme--expanded');\n}\n\n/**\n * Expand details items that are focused. This will expand\n * deprecated symbols when they are navigated to from the index\n * or a direct link.\n */\nfunction openDeprecatedSymbol() {\n  if (!location.hash) return;\n  const heading = document.getElementById(location.hash.slice(1));\n  const grandParent = heading?.parentElement?.parentElement as HTMLDetailsElement | null;\n  if (grandParent?.nodeName === 'DETAILS') {\n    grandParent.open = true;\n  }\n}\nopenDeprecatedSymbol();\nwindow.addEventListener('hashchange', () => openDeprecatedSymbol());\n\n/**\n * Listen for changes in the build context dropdown.\n */\ndocument.querySelectorAll('.js-buildContextSelect').forEach(el => {\n  el.addEventListener('change', e => {\n    window.location.search = `?GOOS=${(e.target as HTMLSelectElement).value}`;\n  });\n});\n"],
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   "names": ["PlayExampleClassName", "PlaygroundExampleController", "exampleEl", "_a", "_b", "_c", "_d", "e", "el", "numLineBreaks", "output", "err", "codeWithModFile", "moduleVars", "PLAYGROUND_BASE_URL", "res", "shareId", "href", "body", "Body", "Error", "Events", "Errors", "resolve", "initPlaygrounds", "exampleHashRegex", "exampleHashEl", "exampleHrefs", "findExampleHash", "playContainer", "ex", "exampleHref", "SelectNavController", "el", "e", "target", "href", "makeSelectNav", "tree", "label", "select", "outline", "groupMap", "group", "t", "o", "_a", "hash", "value", "TreeNavController", "el", "treeitem", "targets", "observer", "entries", "entry", "id", "isIntersecting", "active", "t", "_a", "fn", "href", "target", "delay", "debounce", "currentItem", "nextItem", "ti", "prevItem", "l1", "groupTreeitem", "char", "start", "index", "findItems", "group", "curr", "TreeItem", "idx", "parent", "focusEl", "startIndex", "treeObj", "_b", "_c", "_d", "_e", "groupId", "event", "captured", "func", "wait", "timeout", "args", "later", "ExpandableRowsTableController", "table", "toggleAll", "t", "a", "_a", "e", "target", "isExpanded", "rowIds", "id", "el", "initPlaygrounds", "directories", "table", "ExpandableRowsTableController", "treeEl", "treeCtrl", "TreeNavController", "select", "makeSelectNav", "mobileNav", "SelectNavController", "readme", "readmeContent", "readmeOutline", "readmeExpand", "readmeCollapse", "mobileNavSelect", "expandReadme", "e", "el", "openDeprecatedSymbol", "_a", "heading", "grandParent"]
 }
diff --git a/static/frontend/unit/main/main.min.css b/static/frontend/unit/main/main.min.css
index 9ca4fae..dbd994a 100644
--- a/static/frontend/unit/main/main.min.css
+++ b/static/frontend/unit/main/main.min.css
@@ -5,13 +5,13 @@
  */
 .UnitBuildContext-titleContext label,.UnitBuildContext-singleContext{color:var(--color-text-subtle);font-size:.875rem}.UnitBuildContext-singleContext{padding:.35rem 0}.UnitBuildContext-titleContext select{border-color:var(--color-border);color:var(--color-text-subtle);margin-left:.25rem;min-width:6rem}.UnitBuildContext-titleContext option{color:var(--color-text-subtle)}.UnitBuildContext-link{display:none}@media only screen and (min-width: 30rem){.UnitBuildContext-link{display:initial}}.UnitDoc .UnitBuildContext-titleContext{position:relative}.UnitDoc .UnitBuildContext-titleContext label,.UnitDoc .UnitBuildContext-singleContext{bottom:.875rem;position:absolute;right:0}.UnitDirectories{margin-bottom:2rem}.UnitDirectories h2 a.UnitDirectories-idLink,.UnitDirectories summary a{opacity:0}.UnitDirectories h2:hover a,.UnitDirectories summary:focus a{opacity:1}.UnitDirectories-title{border-bottom:var(--border);font-size:1.375rem;margin:.5rem 0 0;padding-bottom:1rem}.UnitDirectories-title img{margin:auto 1rem auto 0}.UnitDirectories-table{border-collapse:collapse;height:0;table-layout:auto;width:100%}.UnitDirectories-table--tree{margin-top:-2rem}.UnitDirectories-tableHeader{background-color:var(--color-background-accented)}.UnitDirectories-tableHeader--tree{visibility:hidden}.UnitDirectories td{border-bottom:var(--border);max-width:32rem;min-width:12rem;padding:.25rem 1rem;vertical-align:middle;word-break:break-word}.UnitDirectories th{padding:.5rem 1rem;text-align:left}.UnitDirectories tr.hidden{display:none}.UnitDirectories tr[aria-controls]{cursor:pointer}.UnitDirectories tr[aria-controls]:hover{background-color:var(--color-background-accented)}.UnitDirectories th.UnitDirectories-toggleHead{font-size:0;max-width:.625rem;padding:0;width:.625rem}.UnitDirectories td.UnitDirectories-toggleCell,th.UnitDirectories-toggleCell{background-color:var(--background);border:var(--white);max-width:.625rem;padding:0;width:.625rem}.UnitDirectories-toggleButton{font-size:1.25rem;left:-.75rem;margin:0 0 -1rem -.875rem;padding:0;position:absolute;vertical-align:top}.UnitDirectories-subSpacer{border-right:var(--border);display:inline;margin-right:.875rem;width:.0625rem}.UnitDirectories-toggleButton[aria-expanded=true] img{transform:rotate(90deg)}.UnitDirectories-pathCell{align-items:flex-start;display:flex;flex-direction:column;line-height:1.75rem;word-break:break-all}.UnitDirectories-pathCell>div{position:relative}.UnitDirectories-subdirectory{border-left:var(--border);display:flex;flex-direction:column;margin-left:.375rem;padding:.5rem 1rem}.UnitDirectories-mobileSynopsis{display:none;line-height:1.25rem;margin-top:.25rem;word-break:keep-all}@media only screen and (max-width: 52rem){.UnitDirectories-mobileSynopsis{display:initial}.UnitDirectories-table th.UnitDirectories-desktopSynopsis,.UnitDirectories-table td.UnitDirectories-desktopSynopsis{display:none}}.UnitDirectories-expandButton{position:relative}.UnitDirectories-expandButton button{background-color:transparent;border:none;bottom:1rem;color:var(--color-brand-primary);cursor:pointer;display:none;font-size:.875rem;position:absolute;right:0;text-decoration:none}.UnitDirectories-badge{border:.0625rem solid var(--color-text-subtle);border-radius:.125rem;font-size:.6875rem;font-weight:500;line-height:1rem;margin-left:.5rem;margin-top:.125rem;padding:0 .35rem;text-align:center}.UnitDoc{margin-bottom:2rem;word-break:break-word}.UnitDoc h2 a.UnitDoc-idLink,.UnitDoc summary a{opacity:0}.UnitDoc h2:hover a,.UnitDoc summary:focus a{opacity:1}.UnitDoc-title{border-bottom:var(--border);padding-bottom:1rem}.UnitDoc-title img{margin:auto 1rem auto 0}.UnitDoc-emptySection{background-color:var(--color-background-accented);color:var(--color-text-subtle);height:12.25rem;margin-top:1.5rem;text-align:center}.UnitDoc-emptySection img{height:7.8125rem;width:auto}.Documentation .UnitDoc-emptySection p{margin:1rem auto}.UnitDoc .Documentation h4{margin-top:1.5rem}.Documentation{display:block}.Documentation p{margin:1rem 0}.Documentation h2,.Documentation h3{margin-top:1.5rem}.Documentation a{text-decoration:none}.Documentation a:hover{text-decoration:underline}.Documentation h2 a,.Documentation h3 a,.Documentation h4 a.Documentation-idLink,.Documentation summary a{opacity:0}.Documentation a:focus{opacity:1}.Documentation h3 a.Documentation-source{opacity:1}.Documentation h2:hover a,.Documentation h3:hover a,.Documentation h4:hover a,.Documentation summary:hover a,.Documentation summary:focus a{opacity:1}.Documentation ul{line-height:1.5rem;list-style:none;padding-left:0}.Documentation ul ul{padding-left:2em}.Documentation .Documentation-bulletList{list-style:disc;margin-bottom:1rem;padding-left:2rem}.Documentation .Documentation-numberList{list-style:decimal;margin-bottom:1rem;padding-left:2rem}.Documentation pre+pre{margin-top:.625rem}.Documentation .Documentation-declarationLink+pre{border-radius:0 0 .3em .3em;border-top:var(--border);margin-top:0}.Documentation pre .comment{color:var(--color-code-comment)}.Documentation-toc,.Documentation-overview,.Documentation-index,.Documentation-examples{padding-bottom:0}.Documentation-empty{color:var(--color-text-subtle);margin-top:-.5rem}@media only screen and (min-width: 64rem){.Documentation-toc{margin-left:2rem;white-space:nowrap}.Documentation-toc-columns{columns:2}}.Documentation-toc:empty{display:none}.Documentation-tocItem{overflow:hidden;text-overflow:ellipsis}.Documentation-tocItem--constants,.Documentation-tocItem--funcsAndTypes,.Documentation-tocItem--functions,.Documentation-tocItem--types,.Documentation-tocItem--variables,.Documentation-tocItem--notes{display:none}.Documentation-overviewHeader,.Documentation-indexHeader,.Documentation-constantsHeader,.Documentation-variablesHeader,.Documentation-examplesHeader,.Documentation-filesHeader,.Documentation-functionHeader,.Documentation-typeHeader,.Documentation-typeMethodHeader,.Documentation-typeFuncHeader{margin-bottom:.5rem}.Documentation-function h4,.Documentation-type h4,.Documentation-typeFunc h4,.Documentation-typeMethod h4{align-items:baseline;display:flex;justify-content:space-between}.Documentation-sinceVersion{color:var(--color-text-subtle);font-size:.9375rem;font-weight:400}.Documentation-constants br:last-of-type,.Documentation-variables br:last-of-type{display:none}.Documentation-build{color:var(--color-text-subtle);padding-top:1.5rem;text-align:right}.Documentation-declaration pre{scroll-padding-top:calc(var(--js-sticky-header-height, 3.5rem) + 3.75rem)}@media only screen and (min-width: 64rem){.Documentation-declaration pre{scroll-padding-top:calc(var(--js-sticky-header-height, 3.5rem) + .75rem)}}.Documentation-declaration+.Documentation-declaration{margin-top:.625rem}.Documentation-declarationLink{background-color:var(--color-background-accented);border:var(--border);border-bottom:none;border-radius:.3em .3em 0 0;display:block;font-size:.75rem;line-height:.5rem;padding:.375rem;text-align:right}.Documentation-exampleButtonsContainer{align-items:center;display:flex;justify-content:flex-end;margin-top:.5rem}.Documentation-examplePlayButton{background-color:var(--white);border:.15rem solid var(--turq-med);color:var(--turq-med);cursor:pointer;flex-shrink:0;height:2.5rem;width:4.125rem}.Documentation-exampleRunButton,.Documentation-exampleShareButton,.Documentation-exampleFormatButton{border:.0625rem solid var(--turq-dark);border-radius:.25rem;cursor:pointer;height:2rem;margin-left:.5rem;padding:0 1rem}.Documentation-exampleRunButton{background-color:var(--turq-dark);color:var(--white)}.Documentation-exampleShareButton,.Documentation-exampleFormatButton{background-color:var(--white);color:var(--turq-dark)}.Documentation-exampleDetails{margin-top:1rem}.Documentation-exampleDetailsBody pre{border-radius:0 0 .3rem .3rem;margin-bottom:1rem;margin-top:-.25rem}.Documentation-exampleDetailsBody textarea{height:100%;outline:none;overflow-x:auto;resize:none;white-space:pre;width:100%}.Documentation-exampleDetailsBody .Documentation-exampleCode{border-bottom-left-radius:0;border-bottom-right-radius:0;margin:0}.Documentation-exampleDetailsBody .Documentation-exampleOutput{border-top-left-radius:0;border-top-right-radius:0;margin:0 0 .5rem}.Documentation-exampleDetailsHeader{color:var(--color-brand-primary);cursor:pointer;margin-bottom:2rem;outline:none;text-decoration:none}.Documentation-exampleOutputLabel{color:var(--color-text-subtle)}.Documentation-exampleError{color:var(--pink);margin-right:.4rem;padding-right:.5rem}.Documentation-function pre,.Documentation-typeFunc pre,.Documentation-typeMethod pre{white-space:pre-wrap;word-break:break-all;word-wrap:break-word}.Documentation-indexDeprecated{margin-left:.5rem}.Documentation-deprecatedBody{color:var(--color-text-subtle);font-size:.87rem;font-weight:400;margin-left:.25rem;margin-right:.5rem}.Documentation-deprecatedTag{background-color:var(--color-border);border-radius:.125rem;color:var(--color-text-inverted);font-size:.75rem;font-weight:400;line-height:1.375;padding:.125rem .25rem;text-transform:uppercase;vertical-align:middle}.Documentation-deprecatedTitle{align-items:center;display:flex;gap:.5rem}.Documentation-deprecatedDetails,.Documentation-deprecatedDetails a{color:var(--color-text-subtle)}.Documentation-deprecatedDetails[open]{color:var(--color-text)}.Documentation-deprecatedDetails[open] a{color:var(--color-brand-primary)}.Documentation-deprecatedDetails .Documentation-deprecatedBody:after{color:var(--color-brand-primary);content:"Show"}.Documentation-deprecatedDetails[open] .Documentation-deprecatedBody:after{color:var(--color-brand-primary);content:"Hide"}.Documentation-deprecatedDetails>summary{list-style:none;opacity:1}.Documentation-deprecatedDetails .Documentation-source{opacity:1}.Documentation-deprecatedItemBody{padding:1rem 1rem .5rem}.Documentation-deprecatedMessage{align-items:center;display:flex;gap:.5rem;margin-bottom:1rem}.UnitFiles{margin-bottom:2rem}.UnitFiles-titleLink{position:relative}.UnitFiles-titleLink a{bottom:1rem;font-size:.875rem;position:absolute;right:0}.UnitFiles-titleLink a:after{background-image:url(/static/shared/icon/launch_gm_grey_24dp.svg);background-repeat:no-repeat;background-size:.875rem 1.25rem;content:"";display:inline-block;height:1rem;left:.3125rem;position:relative;top:.125rem;width:1rem}.UnitFiles h2 a.UnitFiles-idLink,.UnitFiles summary a{opacity:0}.UnitFiles h2:hover a,.UnitFiles summary:focus a{opacity:1}.UnitFiles-title{border-bottom:var(--border);font-size:1.375rem;margin:.5rem 0 0;padding-bottom:1rem}.UnitFiles-title img{margin:auto 1rem auto 0}.UnitFiles-fileList{columns:12.5rem 5;line-height:1.5rem;list-style:none;margin-top:1rem;padding-left:0;word-break:break-all}.UnitMeta{display:grid;gap:1rem 2rem;grid-template-columns:max-content auto;white-space:nowrap}.UnitMeta-details,.UnitMeta-links{display:flex;flex-flow:wrap;flex-direction:row;gap:1rem 2rem}.UnitMeta-repo{align-items:center;display:flex;overflow:hidden}.UnitMeta-repo a{overflow:hidden;text-overflow:ellipsis}@media (min-width: 50rem){.UnitMeta{grid-template-columns:max-content auto}.UnitMeta-details,.UnitMeta-links{flex-direction:row}}@media (min-width: 112rem){:root[data-layout=responsive] .UnitMeta{grid-template-columns:100%}:root[data-layout=responsive] .UnitMeta-details,:root[data-layout=responsive] .UnitMeta-links{flex-direction:column;white-space:nowrap}}.UnitMeta-detailsLearn{width:100%}@media (min-width: 50rem){.UnitMeta-detailsLearn{width:initial}}.UnitOutline-jumpTo{display:flex;margin-bottom:1rem}.UnitOutline-jumpTo button{align-items:center;background-color:var(--color-background);border:var(--border);border-radius:.25rem;color:var(--color-text-subtle);cursor:pointer;height:2rem;padding-left:1rem;text-align:left;width:100%}.UnitOutline-jumpTo button:hover:not([disabled]){border-color:var(--color-border)}.UnitOutline-jumpToInput:disabled{background-color:var(--gray-9)}.Overview-readmeContent details{display:block}.Overview-readmeContent summary{display:list-item}.Overview-readmeContent a{background-color:initial}.Overview-readmeContent a:active,.Overview-readmeContent a:hover{outline-width:0}.Overview-readmeContent strong{font-weight:inherit;font-weight:bolder}.Overview-readmeContent h3{font-size:2em;margin:.67em 0}.Overview-readmeContent img{border-style:none}.Overview-readmeContent code,.Overview-readmeContent kbd,.Overview-readmeContent pre{font-family:monospace,monospace;font-size:1em}.Overview-readmeContent hr{box-sizing:initial;height:0;overflow:visible}.Overview-readmeContent input{font:inherit;margin:0}.Overview-readmeContent input{overflow:visible}.Overview-readmeContent [type=checkbox]{box-sizing:border-box;padding:0}.Overview-readmeContent *{box-sizing:border-box}.Overview-readmeContent input{font-family:inherit;font-size:inherit;line-height:inherit}.Overview-readmeContent a{color:var(--color-brand-primary);text-decoration:none}.Overview-readmeContent a:hover{text-decoration:underline}.Overview-readmeContent strong{font-weight:600}.Overview-readmeContent hr{height:0;margin:.9375rem 0;overflow:hidden;background:transparent;border:0;border-bottom:var(--border)}.Overview-readmeContent hr:after,.Overview-readmeContent hr:before{display:table;content:""}.Overview-readmeContent hr:after{clear:both}.Overview-readmeContent table{border-spacing:0;border-collapse:collapse}.Overview-readmeContent td,.Overview-readmeContent th{padding:0}.Overview-readmeContent details summary{cursor:pointer}.Overview-readmeContent kbd{display:inline-block;padding:.1875rem .3125rem;font:.6875rem SFMono-Regular,Consolas,Liberation Mono,Menlo,monospace;line-height:.625rem;color:#444d56;vertical-align:middle;background-color:var(--color-background-accented);border:var(--border);border-radius:.1875rem;box-shadow:inset 0 -.0625rem 0 var(--border)}.Overview-readmeContent h3,.Overview-readmeContent h4,.Overview-readmeContent h5,.Overview-readmeContent h6,.Overview-readmeContent div[aria-level="7"],.Overview-readmeContent div[aria-level="8"]{margin-top:0;margin-bottom:0}.Overview-readmeContent h3{font-size:2rem}.Overview-readmeContent h3,.Overview-readmeContent h4{font-weight:600}.Overview-readmeContent h4{font-size:1.5rem}.Overview-readmeContent h5{font-size:1.25rem}.Overview-readmeContent h5,.Overview-readmeContent h6{font-weight:600}.Overview-readmeContent h6{font-size:1rem}.Overview-readmeContent div[aria-level="7"]{font-size:.875rem}.Overview-readmeContent div[aria-level="7"],.Overview-readmeContent div[aria-level="8"]{font-weight:600}.Overview-readmeContent div[aria-level="8"]{font-size:.75rem}.Overview-readmeContent p{margin-top:0;margin-bottom:.625rem}.Overview-readmeContent blockquote{margin:0}.Overview-readmeContent ol,.Overview-readmeContent ul{padding-left:0;margin-top:0;margin-bottom:0}.Overview-readmeContent ol ol,.Overview-readmeContent ul ol{list-style-type:lower-roman}.Overview-readmeContent ol ol ol,.Overview-readmeContent ol ul ol,.Overview-readmeContent ul ol ol,.Overview-readmeContent ul ul ol{list-style-type:lower-alpha}.Overview-readmeContent dd{margin-left:0}.Overview-readmeContent code,.Overview-readmeContent pre{font-family:SFMono-Regular,Consolas,Liberation Mono,Menlo,monospace;font-size:.75rem}.Overview-readmeContent pre{margin-top:0;margin-bottom:0}.Overview-readmeContent input::-webkit-inner-spin-button,.Overview-readmeContent input::-webkit-outer-spin-button{margin:0;-webkit-appearance:none;appearance:none}.Overview-readmeContent :checked+.radio-label{position:relative;z-index:1;border-color:var(--color-brand-primary)}.Overview-readmeContent hr{border-bottom-color:var(--color-border)}.Overview-readmeContent kbd{display:inline-block;padding:.1875rem .3125rem;font:.6875rem SFMono-Regular,Consolas,Liberation Mono,Menlo,monospace;line-height:.625rem;color:#444d56;vertical-align:middle;background-color:var(--color-background-accented);border:var(--border);border-radius:.1875rem;box-shadow:inset 0 -.0625rem 0 var(--color-border)}.Overview-readmeContent a:not([href]){color:inherit;text-decoration:none}.Overview-readmeContent blockquote,.Overview-readmeContent details,.Overview-readmeContent dl,.Overview-readmeContent ol,.Overview-readmeContent p,.Overview-readmeContent pre,.Overview-readmeContent table,.Overview-readmeContent ul{margin-top:0;margin-bottom:1rem}.Overview-readmeContent hr{height:.25em;padding:0;margin:1.5rem 0;background-color:var(--color-border);border:0}.Overview-readmeContent blockquote{padding:0 1em;color:var(--color-text-subtle);border-left:.25em solid var(--color-border)}.Overview-readmeContent blockquote>:first-child{margin-top:0}.Overview-readmeContent blockquote>:last-child{margin-bottom:0}.Overview-readmeContent h3,.Overview-readmeContent h4,.Overview-readmeContent h5,.Overview-readmeContent h6,.Overview-readmeContent div[aria-level="7"],.Overview-readmeContent div[aria-level="8"]{margin-top:1.5rem;margin-bottom:1rem;font-weight:600;line-height:1.25}.Overview-readmeContent h3{font-size:2em}.Overview-readmeContent h3,.Overview-readmeContent h4{padding-bottom:.3em;border-bottom:var(--border)}.Overview-readmeContent h4{font-size:1.5em}.Overview-readmeContent h5{font-size:1.25em}.Overview-readmeContent h6{font-size:1em}.Overview-readmeContent div[aria-level="7"]{font-size:.875em}.Overview-readmeContent div[aria-level="8"]{font-size:.85em;color:var(--color-text-subtle)}.Overview-readmeContent ol,.Overview-readmeContent ul{padding-left:2em}.Overview-readmeContent ol ol,.Overview-readmeContent ol ul,.Overview-readmeContent ul ol,.Overview-readmeContent ul ul{margin-top:0;margin-bottom:0}.Overview-readmeContent li{word-wrap:break-all}.Overview-readmeContent li>p{margin-top:1rem}.Overview-readmeContent li+li{margin-top:.25em}.Overview-readmeContent dl{padding:0}.Overview-readmeContent dl dt{padding:0;margin-top:1rem;font-size:1em;font-style:italic;font-weight:600}.Overview-readmeContent dl dd{padding:0 1rem;margin-bottom:1rem}.Overview-readmeContent table{display:block;width:100%;overflow:auto}.Overview-readmeContent table th{font-weight:600}.Overview-readmeContent table td,.Overview-readmeContent table th{padding:.375rem .8125rem;border:var(--border)}.Overview-readmeContent table tr{background-color:var(--color-background);border-top:var(--border)}.Overview-readmeContent table tr:nth-child(2n){background-color:var(--color-background-accented)}.Overview-readmeContent img{max-width:100%;box-sizing:initial;background-color:var(--color-background)}.Overview-readmeContent img[align=right]{padding-left:1.25rem}.Overview-readmeContent img[align=left]{padding-right:1.25rem}.Overview-readmeContent code{padding:.2em .4em;margin:0;font-size:85%;background-color:var(--color-background-accented);border-radius:.1875rem}.Overview-readmeContent pre{word-wrap:normal}.Overview-readmeContent pre>code{padding:0;margin:0;font-size:100%;word-break:normal;white-space:pre;background:transparent;border:0}.Overview-readmeContent pre{padding:1rem;overflow:auto;font-size:85%;line-height:1.45;background-color:var(--color-background-accented);border-radius:.1875rem}.Overview-readmeContent pre code{display:inline;max-width:auto;padding:0;margin:0;overflow:visible;line-height:inherit;word-wrap:normal;background-color:initial;border:0}.UnitReadme{margin-bottom:2rem}.UnitReadme ul,.UnitReadme ol{list-style:circle}.UnitReadme h2 a.UnitReadme-idLink,.UnitReadme summary a{opacity:0}.UnitReadme h2:hover a,.UnitReadme summary:focus a{opacity:1}.UnitReadme-title{border-bottom:var(--border);font-size:1.375rem;padding-bottom:1rem}.UnitReadme-title img{margin:auto 1rem auto 0}.UnitReadme-content{-webkit-mask-image:linear-gradient(to bottom,black 75%,transparent 100%);mask-image:linear-gradient(to bottom,black 75%,transparent 100%);max-height:20rem;overflow:hidden;position:relative}.UnitReadme-content ul{line-height:1.5rem}.UnitReadme-expandLink{background:none;border:none;color:var(--color-brand-primary);cursor:pointer;padding:0}.UnitReadme-collapseLink{background:none;border:none;color:var(--color-brand-primary);cursor:pointer;display:none;padding:0}.UnitReadme--expanded .UnitReadme-content{-webkit-mask-image:none;mask-image:none;max-height:initial;overflow:initial}.UnitReadme--toggle .UnitReadme-expandLink{display:block}.UnitReadme--expanded .UnitReadme-expandLink{display:none}.UnitReadme--expanded.UnitReadme--toggle .UnitReadme-collapseLink{display:block}.Overview-readmeContent{overflow-wrap:break-word}.UnitDetails{column-gap:2rem;display:grid;grid-template-columns:minmax(0,auto);margin:auto;min-height:32rem}@media only screen and (min-width: 64rem){.UnitDetails{grid-template-columns:15.5rem minmax(30.5rem,43.125rem) minmax(10rem,15.5rem)}}@media only screen and (min-width: 80rem){.UnitDetails{grid-template-columns:15.5rem minmax(43.125rem,60rem) 15.5rem;justify-content:center}}.UnitDetails :target{scroll-margin-top:calc(var(--js-sticky-header-height, 3.5rem) * 2.15)}@media only screen and (min-width: 64rem){.UnitDetails :target{scroll-margin-top:calc(var(--js-sticky-header-height, 3.5rem) * 1.25)}}.UnitDetails :target:not(details,h2){background-color:var(--color-background-highlighted);padding:.25rem}.UnitDetails-meta{order:-1}@media only screen and (min-width: 64rem){.UnitDetails-meta{display:block;margin-top:2rem;order:initial}}.UnitDetails-contentEmpty{align-items:center;background-color:var(--color-background-accented);color:var(--color-text-subtle);display:flex;flex-direction:column;height:15rem;padding-top:1rem;text-align:center}.UnitDetails-contentEmpty img{height:7.8125rem;width:auto}
 /*!
- * Copyright 2020 The Go Authors. All rights reserved.
- * Use of this source code is governed by a BSD-style
- * license that can be found in the LICENSE file.
- */
-/*!
 * Copyright 2019-2020 The Go Authors. All rights reserved.
 * Use of this source code is governed by a BSD-style
 * license that can be found in the LICENSE file.
 */
+/*!
+ * Copyright 2020 The Go Authors. All rights reserved.
+ * Use of this source code is governed by a BSD-style
+ * license that can be found in the LICENSE file.
+ */
 /*# sourceMappingURL=main.min.css.map */
diff --git a/static/frontend/unit/unit.js b/static/frontend/unit/unit.js
index cadf24b..45021ff 100644
--- a/static/frontend/unit/unit.js
+++ b/static/frontend/unit/unit.js
@@ -1,4 +1,4 @@
-var d=class{constructor(r,s,i){this.mainHeader=r;this.mainNav=s;this.mainAside=i;this.handleDoubleClick=r=>{var i,t;r.target===((i=this.mainHeader)==null?void 0:i.lastElementChild)&&((t=window.getSelection())==null||t.removeAllRanges(),window.scrollTo({top:0,behavior:"smooth"}))};this.handleResize=()=>{let r=(s,i)=>document.documentElement.style.setProperty(s,i);r("--js-unit-header-height","0"),setTimeout(()=>{var i,t;let s=((t=(i=this.mainHeader)==null?void 0:i.getBoundingClientRect().height)!=null?t:0)/16;r("--js-unit-header-height",`${s}rem`),r("--js-sticky-header-height",`${3.5}rem`),r("--js-unit-header-top",`${(s-3.5)*-1}rem`)})};this.headerObserver=new IntersectionObserver(([t])=>{if(t.intersectionRatio<1)for(let e of document.querySelectorAll('[class^="go-Main-header"'))e.setAttribute("data-fixed","true");else{for(let e of document.querySelectorAll('[class^="go-Main-header"'))e.removeAttribute("data-fixed");this.handleResize()}},{threshold:1,rootMargin:`${3.5*16}px`}),this.navObserver=new IntersectionObserver(([t])=>{var e,n,h,l;t.intersectionRatio<1?((e=this.mainNav)==null||e.classList.add("go-Main-nav--fixed"),(n=this.mainNav)==null||n.setAttribute("data-fixed","true")):((h=this.mainNav)==null||h.classList.remove("go-Main-nav--fixed"),(l=this.mainNav)==null||l.removeAttribute("data-fixed"))},{threshold:1,rootMargin:`-${3.5*16+10}px`}),this.asideObserver=new IntersectionObserver(([t])=>{var e,n;t.intersectionRatio<1?(e=this.mainHeader)==null||e.setAttribute("data-raised","true"):(n=this.mainHeader)==null||n.removeAttribute("data-raised")},{threshold:1,rootMargin:`-${3.5*16+20}px 0px 0px 0px`}),this.init()}init(){var s,i,t;this.handleResize(),window.addEventListener("resize",this.handleResize),(s=this.mainHeader)==null||s.addEventListener("dblclick",this.handleDoubleClick);let r=document.querySelector(".js-siteHeader");if(((i=this.mainHeader)==null?void 0:i.hasChildNodes())&&r){let e=document.createElement("div");r.prepend(e),this.headerObserver.observe(e)}if((t=this.mainNav)!=null&&t.hasChildNodes()){let e=document.createElement("div");this.mainNav.prepend(e),this.navObserver.observe(e)}if(this.mainAside){let e=document.createElement("div");this.mainAside.prepend(e),this.asideObserver.observe(e)}}},a=o=>document.querySelector(o);new d(a(".js-mainHeader"),a(".js-mainNav"),a(".js-mainAside"));export{d as MainLayoutController};
+var d=class{constructor(r,s,i){this.mainHeader=r;this.mainNav=s;this.mainAside=i;this.handleDoubleClick=r=>{var i,t;r.target===((i=this.mainHeader)==null?void 0:i.lastElementChild)&&((t=window.getSelection())==null||t.removeAllRanges(),window.scrollTo({top:0,behavior:"smooth"}))};this.handleResize=()=>{let r=(s,i)=>document.documentElement.style.setProperty(s,i);r("--js-unit-header-height","0"),setTimeout(()=>{var i,t;let s=((t=(i=this.mainHeader)==null?void 0:i.getBoundingClientRect().height)!=null?t:0)/16;r("--js-unit-header-height",`${s}rem`),r("--js-sticky-header-height",`${3.5}rem`),r("--js-unit-header-top",`${(s-3.5)*-1}rem`)})};this.headerObserver=new IntersectionObserver(([t])=>{if(t.intersectionRatio<1)for(let e of document.querySelectorAll('[class^="go-Main-header"'))e.setAttribute("data-fixed","true");else{for(let e of document.querySelectorAll('[class^="go-Main-header"'))e.removeAttribute("data-fixed");this.handleResize()}},{threshold:1,rootMargin:`${3.5*16}px`}),this.navObserver=new IntersectionObserver(([t])=>{var e,n,h,l;t.intersectionRatio<1?((e=this.mainNav)==null||e.classList.add("go-Main-nav--fixed"),(n=this.mainNav)==null||n.setAttribute("data-fixed","true")):((h=this.mainNav)==null||h.classList.remove("go-Main-nav--fixed"),(l=this.mainNav)==null||l.removeAttribute("data-fixed"))},{threshold:1,rootMargin:`-${3.5*16+10}px`}),this.asideObserver=new IntersectionObserver(([t])=>{var e,n;t.intersectionRatio<1?(e=this.mainHeader)==null||e.setAttribute("data-raised","true"):(n=this.mainHeader)==null||n.removeAttribute("data-raised")},{threshold:1,rootMargin:`-${3.5*16+20}px 0px 0px 0px`}),this.init()}init(){var s,i,t;this.handleResize(),window.addEventListener("resize",this.handleResize),(s=this.mainHeader)==null||s.addEventListener("dblclick",this.handleDoubleClick);let r=document.querySelector(".js-siteHeader");if((i=this.mainHeader)!=null&&i.hasChildNodes()&&r){let e=document.createElement("div");r.prepend(e),this.headerObserver.observe(e)}if((t=this.mainNav)!=null&&t.hasChildNodes()){let e=document.createElement("div");this.mainNav.prepend(e),this.navObserver.observe(e)}if(this.mainAside){let e=document.createElement("div");this.mainAside.prepend(e),this.asideObserver.observe(e)}}},a=o=>document.querySelector(o);new d(a(".js-mainHeader"),a(".js-mainNav"),a(".js-mainAside"));export{d as MainLayoutController};
 /**
  * @license
  * Copyright 2021 The Go Authors. All rights reserved.
diff --git a/static/frontend/unit/unit.js.map b/static/frontend/unit/unit.js.map
index 9e3cfb6..a9d7c76 100644
--- a/static/frontend/unit/unit.js.map
+++ b/static/frontend/unit/unit.js.map
@@ -2,6 +2,6 @@
   "version": 3,
   "sources": ["unit.ts"],
   "sourcesContent": ["/**\n * @license\n * Copyright 2021 The Go Authors. All rights reserved.\n * Use of this source code is governed by a BSD-style\n * license that can be found in the LICENSE file.\n */\n\nconst headerHeight = 3.5;\n\n/**\n * MainLayoutController calculates dynamic height values for header elements\n * to support variable size sticky positioned elements in the header so that\n * banners and breadcumbs may overflow to multiple lines.\n */\nexport class MainLayoutController {\n  private headerObserver: IntersectionObserver;\n  private navObserver: IntersectionObserver;\n  private asideObserver: IntersectionObserver;\n\n  constructor(\n    private mainHeader?: Element | null,\n    private mainNav?: Element | null,\n    private mainAside?: Element | null\n  ) {\n    this.headerObserver = new IntersectionObserver(\n      ([e]) => {\n        if (e.intersectionRatio < 1) {\n          for (const x of document.querySelectorAll('[class^=\"go-Main-header\"')) {\n            x.setAttribute('data-fixed', 'true');\n          }\n        } else {\n          for (const x of document.querySelectorAll('[class^=\"go-Main-header\"')) {\n            x.removeAttribute('data-fixed');\n          }\n          this.handleResize();\n        }\n      },\n      { threshold: 1, rootMargin: `${headerHeight * 16}px` }\n    );\n    this.navObserver = new IntersectionObserver(\n      ([e]) => {\n        if (e.intersectionRatio < 1) {\n          this.mainNav?.classList.add('go-Main-nav--fixed');\n          this.mainNav?.setAttribute('data-fixed', 'true');\n        } else {\n          this.mainNav?.classList.remove('go-Main-nav--fixed');\n          this.mainNav?.removeAttribute('data-fixed');\n        }\n      },\n      { threshold: 1, rootMargin: `-${headerHeight * 16 + 10}px` }\n    );\n    this.asideObserver = new IntersectionObserver(\n      ([e]) => {\n        if (e.intersectionRatio < 1) {\n          this.mainHeader?.setAttribute('data-raised', 'true');\n        } else {\n          this.mainHeader?.removeAttribute('data-raised');\n        }\n      },\n      { threshold: 1, rootMargin: `-${headerHeight * 16 + 20}px 0px 0px 0px` }\n    );\n    this.init();\n  }\n\n  private init() {\n    this.handleResize();\n    window.addEventListener('resize', this.handleResize);\n    this.mainHeader?.addEventListener('dblclick', this.handleDoubleClick);\n    const siteHeader = document.querySelector('.js-siteHeader');\n    if (this.mainHeader?.hasChildNodes() && siteHeader) {\n      const headerSentinel = document.createElement('div');\n      siteHeader.prepend(headerSentinel);\n      this.headerObserver.observe(headerSentinel);\n    }\n    if (this.mainNav?.hasChildNodes()) {\n      const navSentinel = document.createElement('div');\n      this.mainNav.prepend(navSentinel);\n      this.navObserver.observe(navSentinel);\n    }\n    if (this.mainAside) {\n      const asideSentinel = document.createElement('div');\n      this.mainAside.prepend(asideSentinel);\n      this.asideObserver.observe(asideSentinel);\n    }\n  }\n\n  private handleDoubleClick: EventListener = e => {\n    const target = e.target;\n    if (target === this.mainHeader?.lastElementChild) {\n      window.getSelection()?.removeAllRanges();\n      window.scrollTo({ top: 0, behavior: 'smooth' });\n    }\n  };\n\n  private handleResize = () => {\n    const setProp = (name: string, value: string) =>\n      document.documentElement.style.setProperty(name, value);\n    setProp('--js-unit-header-height', '0');\n    setTimeout(() => {\n      const mainHeaderHeight = (this.mainHeader?.getBoundingClientRect().height ?? 0) / 16;\n      setProp('--js-unit-header-height', `${mainHeaderHeight}rem`);\n      setProp('--js-sticky-header-height', `${headerHeight}rem`);\n      setProp('--js-unit-header-top', `${(mainHeaderHeight - headerHeight) * -1}rem`);\n    });\n  };\n}\n\nconst el = <T extends HTMLElement>(selector: string) => document.querySelector<T>(selector);\nnew MainLayoutController(el('.js-mainHeader'), el('.js-mainNav'), el('.js-mainAside'));\n"],
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   "names": ["MainLayoutController", "mainHeader", "mainNav", "mainAside", "e", "_a", "_b", "setProp", "name", "value", "mainHeaderHeight", "x", "_c", "_d", "siteHeader", "headerSentinel", "navSentinel", "asideSentinel", "el", "selector"]
 }
diff --git a/static/frontend/unit/versions/versions.js b/static/frontend/unit/versions/versions.js
index a057521..cf06f98 100644
--- a/static/frontend/unit/versions/versions.js
+++ b/static/frontend/unit/versions/versions.js
@@ -1,4 +1,4 @@
-var i=class{constructor(){this.expand=document.querySelector(".js-versionsExpand");this.collapse=document.querySelector(".js-versionsCollapse");this.details=[...document.querySelectorAll(".js-versionDetails")];var n,e,s;if(!!((n=this.expand)!=null&&n.parentElement)){this.details.some(t=>t.tagName==="DETAILS")&&(this.expand.parentElement.style.display="block");for(let t of this.details)t.addEventListener("click",()=>{this.updateButtons()});(e=this.expand)==null||e.addEventListener("click",()=>{this.details.map(t=>t.open=!0),this.updateButtons()}),(s=this.collapse)==null||s.addEventListener("click",()=>{this.details.map(t=>t.open=!1),this.updateButtons()}),this.updateButtons(),this.setCurrent()}}setCurrent(){var s,t;let n=(t=(s=document.querySelector(".js-canonicalURLPath"))==null?void 0:s.dataset)==null?void 0:t.canonicalUrlPath,e=document.querySelector(`.js-versionLink[href="${n}"]`);e&&(e.style.fontWeight="bold")}updateButtons(){setTimeout(()=>{if(!this.expand||!this.collapse)return;let n,e;for(let s of this.details)n=n||s.open,e=e||!s.open;this.expand.style.display=e?"inline-block":"none",this.collapse.style.display=e?"none":"inline-block"})}};new i;export{i as VersionsController};
+var i=class{constructor(){this.expand=document.querySelector(".js-versionsExpand");this.collapse=document.querySelector(".js-versionsCollapse");this.details=[...document.querySelectorAll(".js-versionDetails")];var n,e,s;if((n=this.expand)!=null&&n.parentElement){this.details.some(t=>t.tagName==="DETAILS")&&(this.expand.parentElement.style.display="block");for(let t of this.details)t.addEventListener("click",()=>{this.updateButtons()});(e=this.expand)==null||e.addEventListener("click",()=>{this.details.map(t=>t.open=!0),this.updateButtons()}),(s=this.collapse)==null||s.addEventListener("click",()=>{this.details.map(t=>t.open=!1),this.updateButtons()}),this.updateButtons(),this.setCurrent()}}setCurrent(){var s,t;let n=(t=(s=document.querySelector(".js-canonicalURLPath"))==null?void 0:s.dataset)==null?void 0:t.canonicalUrlPath,e=document.querySelector(`.js-versionLink[href="${n}"]`);e&&(e.style.fontWeight="bold")}updateButtons(){setTimeout(()=>{if(!this.expand||!this.collapse)return;let n,e;for(let s of this.details)n=n||s.open,e=e||!s.open;this.expand.style.display=e?"inline-block":"none",this.collapse.style.display=e?"none":"inline-block"})}};new i;export{i as VersionsController};
 /*!
  * @license
  * Copyright 2021 The Go Authors. All rights reserved.
diff --git a/static/frontend/unit/versions/versions.js.map b/static/frontend/unit/versions/versions.js.map
index 38c4bb4..57da086 100644
--- a/static/frontend/unit/versions/versions.js.map
+++ b/static/frontend/unit/versions/versions.js.map
@@ -2,6 +2,6 @@
   "version": 3,
   "sources": ["versions.ts"],
   "sourcesContent": ["/*!\n * @license\n * Copyright 2021 The Go Authors. All rights reserved.\n * Use of this source code is governed by a BSD-style\n * license that can be found in the LICENSE file.\n */\n\n/**\n * VersionsController encapsulates event listeners and UI updates\n * for the versions page. As the the expandable sections containing\n * the symbol history for a package are opened and closed it toggles\n * visiblity of the buttons to expand or collapse them. On page load\n * it adds an indicator to the version that matches the version request\n * by the user for the page or the canonical url path.\n */\nexport class VersionsController {\n  private expand = document.querySelector<HTMLButtonElement>('.js-versionsExpand');\n  private collapse = document.querySelector<HTMLButtonElement>('.js-versionsCollapse');\n  private details = [...document.querySelectorAll<HTMLDetailsElement>('.js-versionDetails')];\n\n  constructor() {\n    if (!this.expand?.parentElement) return;\n    if (this.details.some(d => d.tagName === 'DETAILS')) {\n      this.expand.parentElement.style.display = 'block';\n    }\n\n    for (const d of this.details) {\n      d.addEventListener('click', () => {\n        this.updateButtons();\n      });\n    }\n\n    this.expand?.addEventListener('click', () => {\n      this.details.map(d => (d.open = true));\n      this.updateButtons();\n    });\n\n    this.collapse?.addEventListener('click', () => {\n      this.details.map(d => (d.open = false));\n      this.updateButtons();\n    });\n\n    this.updateButtons();\n    this.setCurrent();\n  }\n\n  /**\n   * setCurrent applies the active style to the version dot\n   * for the version that matches the canonical URL path.\n   */\n  private setCurrent() {\n    const canonicalPath = document.querySelector<HTMLElement>('.js-canonicalURLPath')?.dataset\n      ?.canonicalUrlPath;\n    const versionLink = document.querySelector<HTMLElement>(\n      `.js-versionLink[href=\"${canonicalPath}\"]`\n    );\n    if (versionLink) {\n      versionLink.style.fontWeight = 'bold';\n    }\n  }\n\n  private updateButtons() {\n    setTimeout(() => {\n      if (!this.expand || !this.collapse) return;\n      let someOpen, someClosed;\n      for (const d of this.details) {\n        someOpen = someOpen || d.open;\n        someClosed = someClosed || !d.open;\n      }\n      this.expand.style.display = someClosed ? 'inline-block' : 'none';\n      this.collapse.style.display = someClosed ? 'none' : 'inline-block';\n    });\n  }\n}\n\nnew VersionsController();\n"],
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   "names": ["VersionsController", "_a", "_b", "_c", "d", "canonicalPath", "versionLink", "someOpen", "someClosed"]
 }