diff --git a/static/frontend/unit/main/main.js b/static/frontend/unit/main/main.js
index 115f1fa..d0e6fc8 100644
--- a/static/frontend/unit/main/main.js
+++ b/static/frontend/unit/main/main.js
@@ -1,4 +1,4 @@
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i=document.getElementById(r[1]);i&&(i.open=!0)}let e=[...document.querySelectorAll(p.PLAY_HREF)],t=i=>e.find(s=>s.hash===i.getAnchorHash());for(let i of document.querySelectorAll(p.PLAY_CONTAINER)){let s=new I(i),l=t(s);l?l.addEventListener("click",()=>{s.expand()}):console.warn("example href not found")}}var c=document.querySelector(".JumpDialog"),f=c==null?void 0:c.querySelector(".JumpDialog-body"),o=c==null?void 0:c.querySelector(".JumpDialog-list"),u=c==null?void 0:c.querySelector(".JumpDialog-input"),S=document.querySelector(".js-documentation"),h;function _(){let r=[];if(!!S){for(let e of S.querySelectorAll("[data-kind]"))r.push(V(e));for(let e of r)e.link.addEventListener("click",function(){c==null||c.close()});return r.sort(function(e,t){return e.lower.localeCompare(t.lower)}),r}}function V(r){var s;let e=document.createElement("a"),t=r.getAttribute("id");e.setAttribute("href","#"+t),e.setAttribute("tabindex","-1"),e.setAttribute("data-gtmc","jump to link");let 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0:h.length)&&o&&o.children.length>0&&x(0)}function x(r){let e=o==null?void 0:o.children;if(!(!e||!f)){if(T>=0&&e[T].classList.remove("JumpDialog-active"),r>=e.length&&(r=e.length-1),r>=0){e[r].classList.add("JumpDialog-active");let t=e[r].offsetTop-e[0].offsetTop,i=t+e[r].clientHeight;t<f.scrollTop?f.scrollTop=t:i>f.scrollTop+f.clientHeight&&(f.scrollTop=i-f.clientHeight)}T=r}}function O(r){if(T<0)return;let e=T+r;e<0&&(e=0),x(e)}function B(){u==null||u.addEventListener("keyup",function(){u.value.toUpperCase()!=H.toUpperCase()&&v(u.value)}),u==null||u.addEventListener("keydown",function(t){let i=38,s=40,l=13;switch(t.which){case i:O(-1),t.preventDefault();break;case s:O(1),t.preventDefault();break;case l:T>=0&&o&&(o.children[T].click(),t.preventDefault());break}});let r=document.querySelector(".ShortcutsDialog");document.addEventListener("keypress",function(t){if((c==null?void 0:c.open)||(r==null?void 0:r.open))return;let i=t.target,s=i==null?void 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L=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,l]of e)if(l){let n=this.treeitems.find(a=>{var d;return(d=a.el)==null?void 0:d.href.endsWith(`#${s}`)});if(n)for(let a of this.observerCallbacks)a(n);break}},{threshold:1,rootMargin:"-60px 0px 0px 0px"});for(let i of 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0:s.tagName.toLowerCase())==="li"&&(s==null||s.setAttribute("role","none")),e.setAttribute("aria-level",this.depth+""),e.getAttribute("aria-label")&&(this.label=(E=(d=e==null?void 0:e.getAttribute("aria-label"))==null?void 0:d.trim())!=null?E:""),this.isExpandable=!1,this.isVisible=!1,this.isInGroup=!!i;let l=e.nextElementSibling;for(;l;){if(l.tagName.toLowerCase()=="ul"){let w=`${(k=i==null?void 0:i.label)!=null?k:""} 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" 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 /*!
  * @license
  * Copyright 2019-2020 The Go Authors. All rights reserved.
diff --git a/static/frontend/unit/main/main.js.map b/static/frontend/unit/main/main.js.map
index 8c6b73c..ba96971 100644
--- a/static/frontend/unit/main/main.js.map
+++ b/static/frontend/unit/main/main.js.map
@@ -1,7 +1,7 @@
 {
   "version": 3,
-  "sources": ["../../../shared/jump/jump.ts", "../../../shared/playground/playground.ts", "../../../shared/outline/select.ts", "../../../shared/outline/tree.ts", "../../../shared/table/table.ts", "main.ts"],
-  "sourcesContent": ["/*!\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\nconst jumpDialog = document.querySelector<HTMLDialogElement>('.JumpDialog');\nconst jumpBody = jumpDialog?.querySelector<HTMLDivElement>('.JumpDialog-body');\nconst jumpList = jumpDialog?.querySelector<HTMLDivElement>('.JumpDialog-list');\nconst jumpFilter = jumpDialog?.querySelector<HTMLInputElement>('.JumpDialog-input');\nconst doc = document.querySelector<HTMLDivElement>('.js-documentation');\n\ninterface JumpListItem {\n  link: HTMLAnchorElement;\n  name: string;\n  kind: string;\n  lower: string;\n}\n\nlet 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.\nfunction 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\nfunction 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\nlet lastFilterValue: string; // The last contents of the filter text box.\nlet 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.\nfunction 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.\nfunction 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.\nfunction 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).\njumpFilter?.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.\njumpFilter?.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\nconst shortcutsDialog = document.querySelector<HTMLDialogElement>('.ShortcutsDialog');\n\n// Keyboard shortcuts:\n// - Pressing '/' focuses the search box\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.\ndocument.addEventListener('keypress', function (e) {\n  if (jumpDialog?.open || shortcutsDialog?.open) {\n    return;\n  }\n  const target = e.target as HTMLElement | null;\n  const t = target?.tagName;\n  if (t == 'INPUT' || t == 'SELECT' || t == 'TEXTAREA') {\n    return;\n  }\n  if (target?.contentEditable == 'true') {\n    return;\n  }\n  if (e.metaKey || e.ctrlKey) {\n    return;\n  }\n  const ch = String.fromCharCode(e.which);\n  switch (ch) {\n    case 'f':\n    case 'F':\n      e.preventDefault();\n      if (jumpFilter) {\n        jumpFilter.value = '';\n      }\n      jumpDialog?.showModal();\n      jumpFilter?.focus();\n      updateJumpList('');\n      break;\n    case '?':\n      shortcutsDialog?.showModal();\n      break;\n  }\n});\n\nconst jumpOutlineInput = document.querySelector('.js-jumpToInput');\nif (jumpOutlineInput) {\n  jumpOutlineInput.addEventListener('click', () => {\n    if (jumpFilter) {\n      jumpFilter.value = '';\n    }\n    updateJumpList('');\n  });\n}\n\nexport {};\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// 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 accomodate 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 = `${(20 + numLineBreaks * 20 + 12 + 2) / 16}rem`;\n    }\n  }\n\n  /**\n   * Handler to override keyboard behavior in the playground's\n   * textarea element.\n   *\n   * Tab key inserts tabs into the example playground instead of\n   * switching to the next interactive element.\n   * @param e input element keyboard event.\n   */\n  private onKeydown(e: KeyboardEvent) {\n    if (e.key === 'Tab') {\n      document.execCommand('insertText', false, '\\t');\n      e.preventDefault();\n    }\n  }\n\n  /**\n   * Changes the text of the example's input box.\n   */\n  private setInputText(output: string) {\n    if (this.inputEl) {\n      this.inputEl.value = output;\n    }\n  }\n\n  /**\n   * Changes the text of the example's output box.\n   */\n  private setOutputText(output: string) {\n    if (this.outputEl) {\n      this.outputEl.textContent = output;\n    }\n  }\n\n  /**\n   * Sets the error message text and overwrites\n   * output box to indicate a failed response.\n   */\n  private setErrorText(err: string) {\n    if (this.errorEl) {\n      this.errorEl.textContent = err;\n    }\n    this.setOutputText('An error has occurred\u2026');\n  }\n\n  /**\n   * Opens a new window to play.golang.org using the\n   * example snippet's code in the playground.\n   */\n  private handleShareButtonClick() {\n    const PLAYGROUND_BASE_URL = 'https://play.golang.org/p/';\n\n    this.setOutputText('Waiting for remote server\u2026');\n\n    fetch('/play/share', {\n      method: 'POST',\n      body: this.inputEl?.value,\n    })\n      .then(res => res.text())\n      .then(shareId => {\n        const href = PLAYGROUND_BASE_URL + shareId;\n        this.setOutputText(`<a href=\"${href}\">${href}</a>`);\n        window.open(href);\n      })\n      .catch(err => {\n        this.setErrorText(err);\n      });\n  }\n\n  /**\n   * Runs gofmt on the example snippet in the playground.\n   */\n  private handleFormatButtonClick() {\n    this.setOutputText('Waiting for remote server\u2026');\n    const body = new FormData();\n    body.append('body', this.inputEl?.value ?? '');\n\n    fetch('/play/fmt', {\n      method: 'POST',\n      body: body,\n    })\n      .then(res => res.json())\n      .then(({ Body, Error }) => {\n        this.setOutputText(Error || 'Done.');\n        if (Body) {\n          this.setInputText(Body);\n          this.resize();\n        }\n      })\n      .catch(err => {\n        this.setErrorText(err);\n      });\n  }\n\n  /**\n   * Runs the code snippet in the example playground.\n   */\n  private handleRunButtonClick() {\n    this.setOutputText('Waiting for remote server\u2026');\n\n    fetch('/play/compile', {\n      method: 'POST',\n      body: JSON.stringify({ body: this.inputEl?.value, version: 2 }),\n    })\n      .then(res => res.json())\n      .then(async ({ Events, Errors }) => {\n        this.setOutputText(Errors || '');\n        for (const e of Events || []) {\n          this.setOutputText(e.Message);\n          await new Promise(resolve => setTimeout(resolve, e.Delay / 1000000));\n        }\n      })\n      .catch(err => {\n        this.setErrorText(err);\n      });\n  }\n}\n\nconst exampleHashRegex = location.hash.match(/^#(example-.*)$/);\nif (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.\nconst 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 */\nconst findExampleHash = (playContainer: PlaygroundExampleController) =>\n  exampleHrefs.find(ex => {\n    return ex.hash === playContainer.getAnchorHash();\n  });\n\nfor (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 * @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 '../../../shared/jump/jump';\nimport '../../../shared/playground/playground';\n\nimport { SelectNavController, makeSelectNav } from '../../../shared/outline/select';\nimport { TreeNavController } from '../../../shared/outline/tree';\nimport { ExpandableRowsTableController } from '../../../shared/table/table';\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 (window.location.hash.includes('readme')) {\n    readme.classList.add('UnitReadme--expanded');\n  }\n  mobileNavSelect?.addEventListener('change', e => {\n    if ((e.target as HTMLSelectElement).value.startsWith('readme-')) {\n      readme.classList.add('UnitReadme--expanded');\n    }\n  });\n  readmeExpand.forEach(el =>\n    el.addEventListener('click', e => {\n      e.preventDefault();\n      readme.classList.add('UnitReadme--expanded');\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    readme.classList.add('UnitReadme--expanded');\n  });\n  readmeContent.addEventListener('click', () => {\n    readme.classList.add('UnitReadme--expanded');\n  });\n  readmeOutline.addEventListener('click', () => {\n    readme.classList.add('UnitReadme--expanded');\n  });\n  document.addEventListener('keydown', e => {\n    if ((e.ctrlKey || e.metaKey) && e.key === 'f') {\n      readme.classList.add('UnitReadme--expanded');\n    }\n  });\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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+  "sources": ["../../../shared/playground/playground.ts", "../../../shared/jump/jump.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 accomodate 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  /**\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  /**\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.inputEl?.value,\n    })\n      .then(res => res.text())\n      .then(shareId => {\n        const href = PLAYGROUND_BASE_URL + shareId;\n        this.setOutputText(`<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.inputEl?.value, 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 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\nconst jumpDialog = document.querySelector<HTMLDialogElement>('.JumpDialog');\nconst jumpBody = jumpDialog?.querySelector<HTMLDivElement>('.JumpDialog-body');\nconst jumpList = jumpDialog?.querySelector<HTMLDivElement>('.JumpDialog-list');\nconst jumpFilter = jumpDialog?.querySelector<HTMLInputElement>('.JumpDialog-input');\nconst doc = document.querySelector<HTMLDivElement>('.js-documentation');\n\ninterface JumpListItem {\n  link: HTMLAnchorElement;\n  name: string;\n  kind: string;\n  lower: string;\n}\n\nlet 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.\nfunction 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\nfunction 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\nlet lastFilterValue: string; // The last contents of the filter text box.\nlet 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.\nfunction 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.\nfunction 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.\nfunction 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\nexport function initModals(): void {\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  // Keyboard shortcuts:\n  // - Pressing '/' focuses the search box\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  document.addEventListener('keypress', function (e) {\n    if (jumpDialog?.open || shortcutsDialog?.open) {\n      return;\n    }\n    const target = e.target as HTMLElement | null;\n    const t = target?.tagName;\n    if (t == 'INPUT' || t == 'SELECT' || t == 'TEXTAREA') {\n      return;\n    }\n    if (target?.contentEditable == 'true') {\n      return;\n    }\n    if (e.metaKey || e.ctrlKey) {\n      return;\n    }\n    const ch = String.fromCharCode(e.which);\n    switch (ch) {\n      case 'f':\n      case 'F':\n        e.preventDefault();\n        if (jumpFilter) {\n          jumpFilter.value = '';\n        }\n        jumpDialog?.showModal();\n        jumpFilter?.focus();\n        updateJumpList('');\n        break;\n      case '?':\n        shortcutsDialog?.showModal();\n        break;\n    }\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    });\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 { initModals } from 'static/shared/jump/jump';\nimport { SelectNavController, makeSelectNav } from 'static/shared/outline/select';\nimport { TreeNavController } from 'static/shared/outline/tree';\nimport { ExpandableRowsTableController } from 'static/shared/table/table';\n\ninitModals();\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 (window.location.hash.includes('readme')) {\n    readme.classList.add('UnitReadme--expanded');\n  }\n  mobileNavSelect?.addEventListener('change', e => {\n    if ((e.target as HTMLSelectElement).value.startsWith('readme-')) {\n      readme.classList.add('UnitReadme--expanded');\n    }\n  });\n  readmeExpand.forEach(el =>\n    el.addEventListener('click', e => {\n      e.preventDefault();\n      readme.classList.add('UnitReadme--expanded');\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    readme.classList.add('UnitReadme--expanded');\n  });\n  readmeContent.addEventListener('click', () => {\n    readme.classList.add('UnitReadme--expanded');\n  });\n  readmeOutline.addEventListener('click', () => {\n    readme.classList.add('UnitReadme--expanded');\n  });\n  document.addEventListener('keydown', e => {\n    if ((e.ctrlKey || e.metaKey) && e.key === 'f') {\n      readme.classList.add('UnitReadme--expanded');\n    }\n  });\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": []
 }
diff --git a/static/frontend/unit/main/main.ts b/static/frontend/unit/main/main.ts
index 4421862..a37443d 100644
--- a/static/frontend/unit/main/main.ts
+++ b/static/frontend/unit/main/main.ts
@@ -1,9 +1,11 @@
-import '../../../shared/jump/jump';
-import '../../../shared/playground/playground';
+import { initPlaygrounds } from 'static/shared/playground/playground';
+import { initModals } from 'static/shared/jump/jump';
+import { SelectNavController, makeSelectNav } from 'static/shared/outline/select';
+import { TreeNavController } from 'static/shared/outline/tree';
+import { ExpandableRowsTableController } from 'static/shared/table/table';
 
-import { SelectNavController, makeSelectNav } from '../../../shared/outline/select';
-import { TreeNavController } from '../../../shared/outline/tree';
-import { ExpandableRowsTableController } from '../../../shared/table/table';
+initModals();
+initPlaygrounds();
 
 const directories = document.querySelector<HTMLTableElement>('.js-expandableTable');
 if (directories) {
diff --git a/static/shared/jump/jump.js b/static/shared/jump/jump.js
index 9a09340..04d9ed7 100644
--- a/static/shared/jump/jump.js
+++ b/static/shared/jump/jump.js
@@ -3,5 +3,5 @@
  * 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.
- */const c=document.querySelector(".JumpDialog"),a=c==null?void 0:c.querySelector(".JumpDialog-body"),o=c==null?void 0:c.querySelector(".JumpDialog-list"),r=c==null?void 0:c.querySelector(".JumpDialog-input"),L=document.querySelector(".js-documentation");let s;function w(){const t=[];if(!!L){for(const e of L.querySelectorAll("[data-kind]"))t.push(M(e));for(const e of t)e.link.addEventListener("click",function(){c==null||c.close()});return t.sort(function(e,n){return e.lower.localeCompare(n.lower)}),t}}function M(t){var m;const e=document.createElement("a"),n=t.getAttribute("id");e.setAttribute("href","#"+n),e.setAttribute("tabindex","-1"),e.setAttribute("data-gtmc","jump to link");const l=t.getAttribute("data-kind");return{link:e,name:n!=null?n:"",kind:l!=null?l:"",lower:(m=n==null?void 0:n.toLowerCase())!=null?m:""}}let v,f=-1;function T(t){for(v=t,s||(s=w()),k(-1);o==null?void 0:o.firstChild;)o.firstChild.remove();if(t){const e=t.toLowerCase(),n=[],l=[],m=[],p=(i,u,d)=>i.name.substring(0,u)+"<b>"+i.name.substring(u,d)+"</b>"+i.name.substring(d);for(const i of s!=null?s:[]){const u=i.name.toLowerCase();if(u===e)i.link.innerHTML=p(i,0,i.name.length),n.push(i);else if(u.startsWith(e))i.link.innerHTML=p(i,0,t.length),l.push(i);else{const d=u.indexOf(e);d>-1&&(i.link.innerHTML=p(i,d,d+t.length),m.push(i))}}for(const i of n.concat(l).concat(m))o==null||o.appendChild(i.link)}else{if(!s||s.length===0){const e=document.createElement("i");e.innerHTML="There are no symbols on this page.",o==null||o.appendChild(e)}for(const e of s!=null?s:[])e.link.innerHTML=e.name+" <i>"+e.kind+"</i>",o==null||o.appendChild(e.link)}a&&(a.scrollTop=0),(s==null?void 0:s.length)&&o&&o.children.length>0&&k(0)}function k(t){const e=o==null?void 0:o.children;if(!(!e||!a)){if(f>=0&&e[f].classList.remove("JumpDialog-active"),t>=e.length&&(t=e.length-1),t>=0){e[t].classList.add("JumpDialog-active");const n=e[t].offsetTop-e[0].offsetTop,l=n+e[t].clientHeight;n<a.scrollTop?a.scrollTop=n:l>a.scrollTop+a.clientHeight&&(a.scrollTop=l-a.clientHeight)}f=t}}function E(t){if(f<0)return;let e=f+t;e<0&&(e=0),k(e)}r==null||r.addEventListener("keyup",function(){r.value.toUpperCase()!=v.toUpperCase()&&T(r.value)}),r==null||r.addEventListener("keydown",function(t){const e=38,n=40,l=13;switch(t.which){case e:E(-1),t.preventDefault();break;case n:E(1),t.preventDefault();break;case l:f>=0&&o&&(o.children[f].click(),t.preventDefault());break}});const h=document.querySelector(".ShortcutsDialog");document.addEventListener("keypress",function(t){if((c==null?void 0:c.open)||(h==null?void 0:h.open))return;const e=t.target,n=e==null?void 0:e.tagName;if(n=="INPUT"||n=="SELECT"||n=="TEXTAREA"||(e==null?void 0:e.contentEditable)=="true"||t.metaKey||t.ctrlKey)return;switch(String.fromCharCode(t.which)){case"f":case"F":t.preventDefault(),r&&(r.value=""),c==null||c.showModal(),r==null||r.focus(),T("");break;case"?":h==null||h.showModal();break}});const b=document.querySelector(".js-jumpToInput");b&&b.addEventListener("click",()=>{r&&(r.value=""),T("")});
+ */const c=document.querySelector(".JumpDialog"),f=c==null?void 0:c.querySelector(".JumpDialog-body"),o=c==null?void 0:c.querySelector(".JumpDialog-list"),s=c==null?void 0:c.querySelector(".JumpDialog-input"),k=document.querySelector(".js-documentation");let l;function E(){const t=[];if(!!k){for(const e of k.querySelectorAll("[data-kind]"))t.push(M(e));for(const e of t)e.link.addEventListener("click",function(){c==null||c.close()});return t.sort(function(e,n){return e.lower.localeCompare(n.lower)}),t}}function M(t){var a;const e=document.createElement("a"),n=t.getAttribute("id");e.setAttribute("href","#"+n),e.setAttribute("tabindex","-1"),e.setAttribute("data-gtmc","jump to link");const i=t.getAttribute("data-kind");return{link:e,name:n!=null?n:"",kind:i!=null?i:"",lower:(a=n==null?void 0:n.toLowerCase())!=null?a:""}}let v,u=-1;function p(t){for(v=t,l||(l=E()),T(-1);o==null?void 0:o.firstChild;)o.firstChild.remove();if(t){const e=t.toLowerCase(),n=[],i=[],a=[],d=(r,h,m)=>r.name.substring(0,h)+"<b>"+r.name.substring(h,m)+"</b>"+r.name.substring(m);for(const r of l!=null?l:[]){const h=r.name.toLowerCase();if(h===e)r.link.innerHTML=d(r,0,r.name.length),n.push(r);else if(h.startsWith(e))r.link.innerHTML=d(r,0,t.length),i.push(r);else{const m=h.indexOf(e);m>-1&&(r.link.innerHTML=d(r,m,m+t.length),a.push(r))}}for(const r of n.concat(i).concat(a))o==null||o.appendChild(r.link)}else{if(!l||l.length===0){const e=document.createElement("i");e.innerHTML="There are no symbols on this page.",o==null||o.appendChild(e)}for(const e of l!=null?l:[])e.link.innerHTML=e.name+" <i>"+e.kind+"</i>",o==null||o.appendChild(e.link)}f&&(f.scrollTop=0),(l==null?void 0:l.length)&&o&&o.children.length>0&&T(0)}function T(t){const e=o==null?void 0:o.children;if(!(!e||!f)){if(u>=0&&e[u].classList.remove("JumpDialog-active"),t>=e.length&&(t=e.length-1),t>=0){e[t].classList.add("JumpDialog-active");const n=e[t].offsetTop-e[0].offsetTop,i=n+e[t].clientHeight;n<f.scrollTop?f.scrollTop=n:i>f.scrollTop+f.clientHeight&&(f.scrollTop=i-f.clientHeight)}u=t}}function L(t){if(u<0)return;let e=u+t;e<0&&(e=0),T(e)}function b(){s==null||s.addEventListener("keyup",function(){s.value.toUpperCase()!=v.toUpperCase()&&p(s.value)}),s==null||s.addEventListener("keydown",function(n){const i=38,a=40,d=13;switch(n.which){case i:L(-1),n.preventDefault();break;case a:L(1),n.preventDefault();break;case d:u>=0&&o&&(o.children[u].click(),n.preventDefault());break}});const t=document.querySelector(".ShortcutsDialog");document.addEventListener("keypress",function(n){if((c==null?void 0:c.open)||(t==null?void 0:t.open))return;const i=n.target,a=i==null?void 0:i.tagName;if(a=="INPUT"||a=="SELECT"||a=="TEXTAREA"||(i==null?void 0:i.contentEditable)=="true"||n.metaKey||n.ctrlKey)return;switch(String.fromCharCode(n.which)){case"f":case"F":n.preventDefault(),s&&(s.value=""),c==null||c.showModal(),s==null||s.focus(),p("");break;case"?":t==null||t.showModal();break}});const e=document.querySelector(".js-jumpToInput");e&&e.addEventListener("click",()=>{s&&(s.value=""),p("")})}export{b as initModals};
 //# sourceMappingURL=jump.js.map
diff --git a/static/shared/jump/jump.js.map b/static/shared/jump/jump.js.map
index 4ff645d..d39336b 100644
--- a/static/shared/jump/jump.js.map
+++ b/static/shared/jump/jump.js.map
@@ -1,7 +1,7 @@
 {
   "version": 3,
   "sources": ["jump.ts"],
-  "sourcesContent": ["/*!\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\nconst jumpDialog = document.querySelector<HTMLDialogElement>('.JumpDialog');\nconst jumpBody = jumpDialog?.querySelector<HTMLDivElement>('.JumpDialog-body');\nconst jumpList = jumpDialog?.querySelector<HTMLDivElement>('.JumpDialog-list');\nconst jumpFilter = jumpDialog?.querySelector<HTMLInputElement>('.JumpDialog-input');\nconst doc = document.querySelector<HTMLDivElement>('.js-documentation');\n\ninterface JumpListItem {\n  link: HTMLAnchorElement;\n  name: string;\n  kind: string;\n  lower: string;\n}\n\nlet 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.\nfunction 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\nfunction 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\nlet lastFilterValue: string; // The last contents of the filter text box.\nlet 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.\nfunction 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.\nfunction 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.\nfunction 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).\njumpFilter?.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.\njumpFilter?.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\nconst shortcutsDialog = document.querySelector<HTMLDialogElement>('.ShortcutsDialog');\n\n// Keyboard shortcuts:\n// - Pressing '/' focuses the search box\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.\ndocument.addEventListener('keypress', function (e) {\n  if (jumpDialog?.open || shortcutsDialog?.open) {\n    return;\n  }\n  const target = e.target as HTMLElement | null;\n  const t = target?.tagName;\n  if (t == 'INPUT' || t == 'SELECT' || t == 'TEXTAREA') {\n    return;\n  }\n  if (target?.contentEditable == 'true') {\n    return;\n  }\n  if (e.metaKey || e.ctrlKey) {\n    return;\n  }\n  const ch = String.fromCharCode(e.which);\n  switch (ch) {\n    case 'f':\n    case 'F':\n      e.preventDefault();\n      if (jumpFilter) {\n        jumpFilter.value = '';\n      }\n      jumpDialog?.showModal();\n      jumpFilter?.focus();\n      updateJumpList('');\n      break;\n    case '?':\n      shortcutsDialog?.showModal();\n      break;\n  }\n});\n\nconst jumpOutlineInput = document.querySelector('.js-jumpToInput');\nif (jumpOutlineInput) {\n  jumpOutlineInput.addEventListener('click', () => {\n    if (jumpFilter) {\n      jumpFilter.value = '';\n    }\n    updateJumpList('');\n  });\n}\n\nexport {};\n"],
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+  "sourcesContent": ["/*!\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\nconst jumpDialog = document.querySelector<HTMLDialogElement>('.JumpDialog');\nconst jumpBody = jumpDialog?.querySelector<HTMLDivElement>('.JumpDialog-body');\nconst jumpList = jumpDialog?.querySelector<HTMLDivElement>('.JumpDialog-list');\nconst jumpFilter = jumpDialog?.querySelector<HTMLInputElement>('.JumpDialog-input');\nconst doc = document.querySelector<HTMLDivElement>('.js-documentation');\n\ninterface JumpListItem {\n  link: HTMLAnchorElement;\n  name: string;\n  kind: string;\n  lower: string;\n}\n\nlet 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.\nfunction 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\nfunction 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\nlet lastFilterValue: string; // The last contents of the filter text box.\nlet 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.\nfunction 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.\nfunction 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.\nfunction 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\nexport function initModals(): void {\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  // Keyboard shortcuts:\n  // - Pressing '/' focuses the search box\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  document.addEventListener('keypress', function (e) {\n    if (jumpDialog?.open || shortcutsDialog?.open) {\n      return;\n    }\n    const target = e.target as HTMLElement | null;\n    const t = target?.tagName;\n    if (t == 'INPUT' || t == 'SELECT' || t == 'TEXTAREA') {\n      return;\n    }\n    if (target?.contentEditable == 'true') {\n      return;\n    }\n    if (e.metaKey || e.ctrlKey) {\n      return;\n    }\n    const ch = String.fromCharCode(e.which);\n    switch (ch) {\n      case 'f':\n      case 'F':\n        e.preventDefault();\n        if (jumpFilter) {\n          jumpFilter.value = '';\n        }\n        jumpDialog?.showModal();\n        jumpFilter?.focus();\n        updateJumpList('');\n        break;\n      case '?':\n        shortcutsDialog?.showModal();\n        break;\n    }\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    });\n  }\n}\n"],
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   "names": []
 }
diff --git a/static/shared/jump/jump.ts b/static/shared/jump/jump.ts
index 03db6ee..fe4965a 100644
--- a/static/shared/jump/jump.ts
+++ b/static/shared/jump/jump.ts
@@ -216,87 +216,87 @@
   setActiveJumpItem(n);
 }
 
-// Pressing a key in the filter updates the list (if the filter actually changed).
-jumpFilter?.addEventListener('keyup', function () {
-  if (jumpFilter.value.toUpperCase() != lastFilterValue.toUpperCase()) {
-    updateJumpList(jumpFilter.value);
-  }
-});
+export function initModals(): void {
+  // Pressing a key in the filter updates the list (if the filter actually changed).
+  jumpFilter?.addEventListener('keyup', function () {
+    if (jumpFilter.value.toUpperCase() != lastFilterValue.toUpperCase()) {
+      updateJumpList(jumpFilter.value);
+    }
+  });
 
-// Pressing enter in the filter selects the first element in the list.
-jumpFilter?.addEventListener('keydown', function (event) {
-  const upArrow = 38;
-  const downArrow = 40;
-  const enterKey = 13;
-  switch (event.which) {
-    case upArrow:
-      incActiveJumpItem(-1);
-      event.preventDefault();
-      break;
-    case downArrow:
-      incActiveJumpItem(1);
-      event.preventDefault();
-      break;
-    case enterKey:
-      if (activeJumpItem >= 0) {
-        if (jumpList) {
-          (jumpList.children[activeJumpItem] as HTMLElement).click();
-          event.preventDefault();
+  // Pressing enter in the filter selects the first element in the list.
+  jumpFilter?.addEventListener('keydown', function (event) {
+    const upArrow = 38;
+    const downArrow = 40;
+    const enterKey = 13;
+    switch (event.which) {
+      case upArrow:
+        incActiveJumpItem(-1);
+        event.preventDefault();
+        break;
+      case downArrow:
+        incActiveJumpItem(1);
+        event.preventDefault();
+        break;
+      case enterKey:
+        if (activeJumpItem >= 0) {
+          if (jumpList) {
+            (jumpList.children[activeJumpItem] as HTMLElement).click();
+            event.preventDefault();
+          }
         }
-      }
-      break;
-  }
-});
+        break;
+    }
+  });
 
-const shortcutsDialog = document.querySelector<HTMLDialogElement>('.ShortcutsDialog');
+  const shortcutsDialog = document.querySelector<HTMLDialogElement>('.ShortcutsDialog');
 
-// Keyboard shortcuts:
-// - Pressing '/' focuses the search box
-// - Pressing 'f' or 'F' opens the jump-to-symbol dialog.
-// - Pressing '?' opens up the shortcut dialog.
-// Ignore a keypress if a dialog is already open, or if it is pressed on a
-// component that wants to consume it.
-document.addEventListener('keypress', function (e) {
-  if (jumpDialog?.open || shortcutsDialog?.open) {
-    return;
-  }
-  const target = e.target as HTMLElement | null;
-  const t = target?.tagName;
-  if (t == 'INPUT' || t == 'SELECT' || t == 'TEXTAREA') {
-    return;
-  }
-  if (target?.contentEditable == 'true') {
-    return;
-  }
-  if (e.metaKey || e.ctrlKey) {
-    return;
-  }
-  const ch = String.fromCharCode(e.which);
-  switch (ch) {
-    case 'f':
-    case 'F':
-      e.preventDefault();
+  // Keyboard shortcuts:
+  // - Pressing '/' focuses the search box
+  // - Pressing 'f' or 'F' opens the jump-to-symbol dialog.
+  // - Pressing '?' opens up the shortcut dialog.
+  // Ignore a keypress if a dialog is already open, or if it is pressed on a
+  // component that wants to consume it.
+  document.addEventListener('keypress', function (e) {
+    if (jumpDialog?.open || shortcutsDialog?.open) {
+      return;
+    }
+    const target = e.target as HTMLElement | null;
+    const t = target?.tagName;
+    if (t == 'INPUT' || t == 'SELECT' || t == 'TEXTAREA') {
+      return;
+    }
+    if (target?.contentEditable == 'true') {
+      return;
+    }
+    if (e.metaKey || e.ctrlKey) {
+      return;
+    }
+    const ch = String.fromCharCode(e.which);
+    switch (ch) {
+      case 'f':
+      case 'F':
+        e.preventDefault();
+        if (jumpFilter) {
+          jumpFilter.value = '';
+        }
+        jumpDialog?.showModal();
+        jumpFilter?.focus();
+        updateJumpList('');
+        break;
+      case '?':
+        shortcutsDialog?.showModal();
+        break;
+    }
+  });
+
+  const jumpOutlineInput = document.querySelector('.js-jumpToInput');
+  if (jumpOutlineInput) {
+    jumpOutlineInput.addEventListener('click', () => {
       if (jumpFilter) {
         jumpFilter.value = '';
       }
-      jumpDialog?.showModal();
-      jumpFilter?.focus();
       updateJumpList('');
-      break;
-    case '?':
-      shortcutsDialog?.showModal();
-      break;
+    });
   }
-});
-
-const jumpOutlineInput = document.querySelector('.js-jumpToInput');
-if (jumpOutlineInput) {
-  jumpOutlineInput.addEventListener('click', () => {
-    if (jumpFilter) {
-      jumpFilter.value = '';
-    }
-    updateJumpList('');
-  });
 }
-
-export {};
diff --git a/static/shared/playground/playground.js b/static/shared/playground/playground.js
index 5f85361..3c28bfe 100644
--- a/static/shared/playground/playground.js
+++ b/static/shared/playground/playground.js
@@ -3,5 +3,5 @@
  * 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.
- */const o={PLAY_HREF:".js-exampleHref",PLAY_CONTAINER:".js-exampleContainer",EXAMPLE_INPUT:".Documentation-exampleCode",EXAMPLE_OUTPUT:".Documentation-exampleOutput",EXAMPLE_ERROR:".Documentation-exampleError",PLAY_BUTTON:".Documentation-examplePlayButton",SHARE_BUTTON:".Documentation-exampleShareButton",FORMAT_BUTTON:".Documentation-exampleFormatButton",RUN_BUTTON:".Documentation-exampleRunButton"};class u{constructor(t){this.exampleEl=t;var e,r,n,l;this.exampleEl=t,this.anchorEl=t.querySelector("a"),this.errorEl=t.querySelector(o.EXAMPLE_ERROR),this.playButtonEl=t.querySelector(o.PLAY_BUTTON),this.shareButtonEl=t.querySelector(o.SHARE_BUTTON),this.formatButtonEl=t.querySelector(o.FORMAT_BUTTON),this.runButtonEl=t.querySelector(o.RUN_BUTTON),this.inputEl=this.makeTextArea(t.querySelector(o.EXAMPLE_INPUT)),this.outputEl=t.querySelector(o.EXAMPLE_OUTPUT),(e=this.playButtonEl)==null||e.addEventListener("click",()=>this.handleShareButtonClick()),(r=this.shareButtonEl)==null||r.addEventListener("click",()=>this.handleShareButtonClick()),(n=this.formatButtonEl)==null||n.addEventListener("click",()=>this.handleFormatButtonClick()),(l=this.runButtonEl)==null||l.addEventListener("click",()=>this.handleRunButtonClick()),!!this.inputEl&&(this.resize(),this.inputEl.addEventListener("keyup",()=>this.resize()),this.inputEl.addEventListener("keydown",s=>this.onKeydown(s)))}makeTextArea(t){var r,n;const e=document.createElement("textarea");return e.classList.add("Documentation-exampleCode","code"),e.spellcheck=!1,e.value=(r=t==null?void 0:t.textContent)!=null?r:"",(n=t==null?void 0:t.parentElement)==null||n.replaceChild(e,t),e}getAnchorHash(){var t;return(t=this.anchorEl)==null?void 0:t.hash}expand(){this.exampleEl.open=!0}resize(){var t;if((t=this.inputEl)==null?void 0:t.value){const e=(this.inputEl.value.match(/\n/g)||[]).length;this.inputEl.style.height=`${(20+e*20+12+2)/16}rem`}}onKeydown(t){t.key==="Tab"&&(document.execCommand("insertText",!1,"	"),t.preventDefault())}setInputText(t){this.inputEl&&(this.inputEl.value=t)}setOutputText(t){this.outputEl&&(this.outputEl.textContent=t)}setErrorText(t){this.errorEl&&(this.errorEl.textContent=t),this.setOutputText("An error has occurred\u2026")}handleShareButtonClick(){var e;const t="https://play.golang.org/p/";this.setOutputText("Waiting for remote server\u2026"),fetch("/play/share",{method:"POST",body:(e=this.inputEl)==null?void 0:e.value}).then(r=>r.text()).then(r=>{const n=t+r;this.setOutputText(`<a href="${n}">${n}</a>`),window.open(n)}).catch(r=>{this.setErrorText(r)})}handleFormatButtonClick(){var e,r;this.setOutputText("Waiting for remote server\u2026");const t=new FormData;t.append("body",(r=(e=this.inputEl)==null?void 0:e.value)!=null?r:""),fetch("/play/fmt",{method:"POST",body:t}).then(n=>n.json()).then(({Body:n,Error:l})=>{this.setOutputText(l||"Done."),n&&(this.setInputText(n),this.resize())}).catch(n=>{this.setErrorText(n)})}handleRunButtonClick(){var t;this.setOutputText("Waiting for remote server\u2026"),fetch("/play/compile",{method:"POST",body:JSON.stringify({body:(t=this.inputEl)==null?void 0:t.value,version:2})}).then(e=>e.json()).then(async({Events:e,Errors:r})=>{this.setOutputText(r||"");for(const n of e||[])this.setOutputText(n.Message),await new Promise(l=>setTimeout(l,n.Delay/1e6))}).catch(e=>{this.setErrorText(e)})}}const i=location.hash.match(/^#(example-.*)$/);if(i){const a=document.getElementById(i[1]);a&&(a.open=!0)}const h=[...document.querySelectorAll(o.PLAY_HREF)],c=a=>h.find(t=>t.hash===a.getAnchorHash());for(const a of document.querySelectorAll(o.PLAY_CONTAINER)){const t=new u(a),e=c(t);e?e.addEventListener("click",()=>{t.expand()}):console.warn("example href not found")}export{u as PlaygroundExampleController};
+ */const a={PLAY_HREF:".js-exampleHref",PLAY_CONTAINER:".js-exampleContainer",EXAMPLE_INPUT:".Documentation-exampleCode",EXAMPLE_OUTPUT:".Documentation-exampleOutput",EXAMPLE_ERROR:".Documentation-exampleError",PLAY_BUTTON:".Documentation-examplePlayButton",SHARE_BUTTON:".Documentation-exampleShareButton",FORMAT_BUTTON:".Documentation-exampleFormatButton",RUN_BUTTON:".Documentation-exampleRunButton"};class s{constructor(t){this.exampleEl=t;var e,r,n,o;this.exampleEl=t,this.anchorEl=t.querySelector("a"),this.errorEl=t.querySelector(a.EXAMPLE_ERROR),this.playButtonEl=t.querySelector(a.PLAY_BUTTON),this.shareButtonEl=t.querySelector(a.SHARE_BUTTON),this.formatButtonEl=t.querySelector(a.FORMAT_BUTTON),this.runButtonEl=t.querySelector(a.RUN_BUTTON),this.inputEl=this.makeTextArea(t.querySelector(a.EXAMPLE_INPUT)),this.outputEl=t.querySelector(a.EXAMPLE_OUTPUT),(e=this.playButtonEl)==null||e.addEventListener("click",()=>this.handleShareButtonClick()),(r=this.shareButtonEl)==null||r.addEventListener("click",()=>this.handleShareButtonClick()),(n=this.formatButtonEl)==null||n.addEventListener("click",()=>this.handleFormatButtonClick()),(o=this.runButtonEl)==null||o.addEventListener("click",()=>this.handleRunButtonClick()),!!this.inputEl&&(this.resize(),this.inputEl.addEventListener("keyup",()=>this.resize()),this.inputEl.addEventListener("keydown",l=>this.onKeydown(l)))}makeTextArea(t){var r,n;const e=document.createElement("textarea");return e.classList.add("Documentation-exampleCode","code"),e.spellcheck=!1,e.value=(r=t==null?void 0:t.textContent)!=null?r:"",(n=t==null?void 0:t.parentElement)==null||n.replaceChild(e,t),e}getAnchorHash(){var t;return(t=this.anchorEl)==null?void 0:t.hash}expand(){this.exampleEl.open=!0}resize(){var t;if((t=this.inputEl)==null?void 0:t.value){const e=(this.inputEl.value.match(/\n/g)||[]).length;this.inputEl.style.height=`${(20+e*20+12+2)/16}rem`}}onKeydown(t){t.key==="Tab"&&(document.execCommand("insertText",!1,"	"),t.preventDefault())}setInputText(t){this.inputEl&&(this.inputEl.value=t)}setOutputText(t){this.outputEl&&(this.outputEl.textContent=t)}setErrorText(t){this.errorEl&&(this.errorEl.textContent=t),this.setOutputText("An error has occurred\u2026")}handleShareButtonClick(){var e;const t="https://play.golang.org/p/";this.setOutputText("Waiting for remote server\u2026"),fetch("/play/share",{method:"POST",body:(e=this.inputEl)==null?void 0:e.value}).then(r=>r.text()).then(r=>{const n=t+r;this.setOutputText(`<a href="${n}">${n}</a>`),window.open(n)}).catch(r=>{this.setErrorText(r)})}handleFormatButtonClick(){var e,r;this.setOutputText("Waiting for remote server\u2026");const t=new FormData;t.append("body",(r=(e=this.inputEl)==null?void 0:e.value)!=null?r:""),fetch("/play/fmt",{method:"POST",body:t}).then(n=>n.json()).then(({Body:n,Error:o})=>{this.setOutputText(o||"Done."),n&&(this.setInputText(n),this.resize())}).catch(n=>{this.setErrorText(n)})}handleRunButtonClick(){var t;this.setOutputText("Waiting for remote server\u2026"),fetch("/play/compile",{method:"POST",body:JSON.stringify({body:(t=this.inputEl)==null?void 0:t.value,version:2})}).then(e=>e.json()).then(async({Events:e,Errors:r})=>{this.setOutputText(r||"");for(const n of e||[])this.setOutputText(n.Message),await new Promise(o=>setTimeout(o,n.Delay/1e6))}).catch(e=>{this.setErrorText(e)})}}function u(){const i=location.hash.match(/^#(example-.*)$/);if(i){const r=document.getElementById(i[1]);r&&(r.open=!0)}const t=[...document.querySelectorAll(a.PLAY_HREF)],e=r=>t.find(n=>n.hash===r.getAnchorHash());for(const r of document.querySelectorAll(a.PLAY_CONTAINER)){const n=new s(r),o=e(n);o?o.addEventListener("click",()=>{n.expand()}):console.warn("example href not found")}}export{s as PlaygroundExampleController,u as initPlaygrounds};
 //# sourceMappingURL=playground.js.map
diff --git a/static/shared/playground/playground.js.map b/static/shared/playground/playground.js.map
index 35ddf5b..d858f6e 100644
--- a/static/shared/playground/playground.js.map
+++ b/static/shared/playground/playground.js.map
@@ -1,7 +1,7 @@
 {
   "version": 3,
   "sources": ["playground.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 accomodate 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 = `${(20 + numLineBreaks * 20 + 12 + 2) / 16}rem`;\n    }\n  }\n\n  /**\n   * Handler to override keyboard behavior in the playground's\n   * textarea element.\n   *\n   * Tab key inserts tabs into the example playground instead of\n   * switching to the next interactive element.\n   * @param e input element keyboard event.\n   */\n  private onKeydown(e: KeyboardEvent) {\n    if (e.key === 'Tab') {\n      document.execCommand('insertText', false, '\\t');\n      e.preventDefault();\n    }\n  }\n\n  /**\n   * Changes the text of the example's input box.\n   */\n  private setInputText(output: string) {\n    if (this.inputEl) {\n      this.inputEl.value = output;\n    }\n  }\n\n  /**\n   * Changes the text of the example's output box.\n   */\n  private setOutputText(output: string) {\n    if (this.outputEl) {\n      this.outputEl.textContent = output;\n    }\n  }\n\n  /**\n   * Sets the error message text and overwrites\n   * output box to indicate a failed response.\n   */\n  private setErrorText(err: string) {\n    if (this.errorEl) {\n      this.errorEl.textContent = err;\n    }\n    this.setOutputText('An error has occurred\u2026');\n  }\n\n  /**\n   * Opens a new window to play.golang.org using the\n   * example snippet's code in the playground.\n   */\n  private handleShareButtonClick() {\n    const PLAYGROUND_BASE_URL = 'https://play.golang.org/p/';\n\n    this.setOutputText('Waiting for remote server\u2026');\n\n    fetch('/play/share', {\n      method: 'POST',\n      body: this.inputEl?.value,\n    })\n      .then(res => res.text())\n      .then(shareId => {\n        const href = PLAYGROUND_BASE_URL + shareId;\n        this.setOutputText(`<a href=\"${href}\">${href}</a>`);\n        window.open(href);\n      })\n      .catch(err => {\n        this.setErrorText(err);\n      });\n  }\n\n  /**\n   * Runs gofmt on the example snippet in the playground.\n   */\n  private handleFormatButtonClick() {\n    this.setOutputText('Waiting for remote server\u2026');\n    const body = new FormData();\n    body.append('body', this.inputEl?.value ?? '');\n\n    fetch('/play/fmt', {\n      method: 'POST',\n      body: body,\n    })\n      .then(res => res.json())\n      .then(({ Body, Error }) => {\n        this.setOutputText(Error || 'Done.');\n        if (Body) {\n          this.setInputText(Body);\n          this.resize();\n        }\n      })\n      .catch(err => {\n        this.setErrorText(err);\n      });\n  }\n\n  /**\n   * Runs the code snippet in the example playground.\n   */\n  private handleRunButtonClick() {\n    this.setOutputText('Waiting for remote server\u2026');\n\n    fetch('/play/compile', {\n      method: 'POST',\n      body: JSON.stringify({ body: this.inputEl?.value, version: 2 }),\n    })\n      .then(res => res.json())\n      .then(async ({ Events, Errors }) => {\n        this.setOutputText(Errors || '');\n        for (const e of Events || []) {\n          this.setOutputText(e.Message);\n          await new Promise(resolve => setTimeout(resolve, e.Delay / 1000000));\n        }\n      })\n      .catch(err => {\n        this.setErrorText(err);\n      });\n  }\n}\n\nconst exampleHashRegex = location.hash.match(/^#(example-.*)$/);\nif (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.\nconst 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 */\nconst findExampleHash = (playContainer: PlaygroundExampleController) =>\n  exampleHrefs.find(ex => {\n    return ex.hash === playContainer.getAnchorHash();\n  });\n\nfor (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"],
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+  "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 accomodate 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 = `${(20 + numLineBreaks * 20 + 12 + 2) / 16}rem`;\n    }\n  }\n\n  /**\n   * Handler to override keyboard behavior in the playground's\n   * textarea element.\n   *\n   * Tab key inserts tabs into the example playground instead of\n   * switching to the next interactive element.\n   * @param e input element keyboard event.\n   */\n  private onKeydown(e: KeyboardEvent) {\n    if (e.key === 'Tab') {\n      document.execCommand('insertText', false, '\\t');\n      e.preventDefault();\n    }\n  }\n\n  /**\n   * Changes the text of the example's input box.\n   */\n  private setInputText(output: string) {\n    if (this.inputEl) {\n      this.inputEl.value = output;\n    }\n  }\n\n  /**\n   * Changes the text of the example's output box.\n   */\n  private setOutputText(output: string) {\n    if (this.outputEl) {\n      this.outputEl.textContent = output;\n    }\n  }\n\n  /**\n   * Sets the error message text and overwrites\n   * output box to indicate a failed response.\n   */\n  private setErrorText(err: string) {\n    if (this.errorEl) {\n      this.errorEl.textContent = err;\n    }\n    this.setOutputText('An error has occurred\u2026');\n  }\n\n  /**\n   * Opens a new window to play.golang.org using the\n   * example snippet's code in the playground.\n   */\n  private handleShareButtonClick() {\n    const PLAYGROUND_BASE_URL = 'https://play.golang.org/p/';\n\n    this.setOutputText('Waiting for remote server\u2026');\n\n    fetch('/play/share', {\n      method: 'POST',\n      body: this.inputEl?.value,\n    })\n      .then(res => res.text())\n      .then(shareId => {\n        const href = PLAYGROUND_BASE_URL + shareId;\n        this.setOutputText(`<a href=\"${href}\">${href}</a>`);\n        window.open(href);\n      })\n      .catch(err => {\n        this.setErrorText(err);\n      });\n  }\n\n  /**\n   * Runs gofmt on the example snippet in the playground.\n   */\n  private handleFormatButtonClick() {\n    this.setOutputText('Waiting for remote server\u2026');\n    const body = new FormData();\n    body.append('body', this.inputEl?.value ?? '');\n\n    fetch('/play/fmt', {\n      method: 'POST',\n      body: body,\n    })\n      .then(res => res.json())\n      .then(({ Body, Error }) => {\n        this.setOutputText(Error || 'Done.');\n        if (Body) {\n          this.setInputText(Body);\n          this.resize();\n        }\n      })\n      .catch(err => {\n        this.setErrorText(err);\n      });\n  }\n\n  /**\n   * Runs the code snippet in the example playground.\n   */\n  private handleRunButtonClick() {\n    this.setOutputText('Waiting for remote server\u2026');\n\n    fetch('/play/compile', {\n      method: 'POST',\n      body: JSON.stringify({ body: this.inputEl?.value, version: 2 }),\n    })\n      .then(res => res.json())\n      .then(async ({ Events, Errors }) => {\n        this.setOutputText(Errors || '');\n        for (const e of Events || []) {\n          this.setOutputText(e.Message);\n          await new Promise(resolve => setTimeout(resolve, e.Delay / 1000000));\n        }\n      })\n      .catch(err => {\n        this.setErrorText(err);\n      });\n  }\n}\n\nexport function initPlaygrounds(): void {\n  const exampleHashRegex = location.hash.match(/^#(example-.*)$/);\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"],
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   "names": []
 }
diff --git a/static/shared/playground/playground.ts b/static/shared/playground/playground.ts
index dea7794..d0b5261 100644
--- a/static/shared/playground/playground.ts
+++ b/static/shared/playground/playground.ts
@@ -253,38 +253,40 @@
   }
 }
 
-const exampleHashRegex = location.hash.match(/^#(example-.*)$/);
-if (exampleHashRegex) {
-  const exampleHashEl = document.getElementById(exampleHashRegex[1]) as HTMLDetailsElement;
-  if (exampleHashEl) {
-    exampleHashEl.open = true;
+export function initPlaygrounds(): void {
+  const exampleHashRegex = location.hash.match(/^#(example-.*)$/);
+  if (exampleHashRegex) {
+    const exampleHashEl = document.getElementById(exampleHashRegex[1]) as HTMLDetailsElement;
+    if (exampleHashEl) {
+      exampleHashEl.open = true;
+    }
   }
-}
 
-// We use a spread operator to convert a nodelist into an array of elements.
-const exampleHrefs = [
-  ...document.querySelectorAll<HTMLAnchorElement>(PlayExampleClassName.PLAY_HREF),
-];
+  // We use a spread operator to convert a nodelist into an array of elements.
+  const exampleHrefs = [
+    ...document.querySelectorAll<HTMLAnchorElement>(PlayExampleClassName.PLAY_HREF),
+  ];
 
-/**
- * Sometimes exampleHrefs and playContainers are in different order, so we
- * find an exampleHref from a common hash.
- * @param playContainer - playground container
- */
-const findExampleHash = (playContainer: PlaygroundExampleController) =>
-  exampleHrefs.find(ex => {
-    return ex.hash === playContainer.getAnchorHash();
-  });
-
-for (const el of document.querySelectorAll(PlayExampleClassName.PLAY_CONTAINER)) {
-  // There should be the same amount of hrefs referencing examples as example containers.
-  const playContainer = new PlaygroundExampleController(el as HTMLDetailsElement);
-  const exampleHref = findExampleHash(playContainer);
-  if (exampleHref) {
-    exampleHref.addEventListener('click', () => {
-      playContainer.expand();
+  /**
+   * Sometimes exampleHrefs and playContainers are in different order, so we
+   * find an exampleHref from a common hash.
+   * @param playContainer - playground container
+   */
+  const findExampleHash = (playContainer: PlaygroundExampleController) =>
+    exampleHrefs.find(ex => {
+      return ex.hash === playContainer.getAnchorHash();
     });
-  } else {
-    console.warn('example href not found');
+
+  for (const el of document.querySelectorAll(PlayExampleClassName.PLAY_CONTAINER)) {
+    // There should be the same amount of hrefs referencing examples as example containers.
+    const playContainer = new PlaygroundExampleController(el as HTMLDetailsElement);
+    const exampleHref = findExampleHash(playContainer);
+    if (exampleHref) {
+      exampleHref.addEventListener('click', () => {
+        playContainer.expand();
+      });
+    } else {
+      console.warn('example href not found');
+    }
   }
 }