diff --git a/static/frontend/unit/main/main.js b/static/frontend/unit/main/main.js
index 4affcb6..525c597 100644
--- a/static/frontend/unit/main/main.js
+++ b/static/frontend/unit/main/main.js
@@ -1,4 +1,9 @@
-var d={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"},g=class{constructor(e){this.exampleEl=e;var t,i,s,r;this.exampleEl=e,this.anchorEl=e.querySelector("a"),this.errorEl=e.querySelector(d.EXAMPLE_ERROR),this.playButtonEl=e.querySelector(d.PLAY_BUTTON),this.shareButtonEl=e.querySelector(d.SHARE_BUTTON),this.formatButtonEl=e.querySelector(d.FORMAT_BUTTON),this.runButtonEl=e.querySelector(d.RUN_BUTTON),this.inputEl=this.makeTextArea(e.querySelector(d.EXAMPLE_INPUT)),this.outputEl=e.querySelector(d.EXAMPLE_OUTPUT),(t=this.playButtonEl)==null||t.addEventListener("click",()=>this.handleShareButtonClick()),(i=this.shareButtonEl)==null||i.addEventListener("click",()=>this.handleShareButtonClick()),(s=this.formatButtonEl)==null||s.addEventListener("click",()=>this.handleFormatButtonClick()),(r=this.runButtonEl)==null||r.addEventListener("click",()=>this.handleRunButtonClick()),!!this.inputEl&&(this.resize(),this.inputEl.addEventListener("keyup",()=>this.resize()),this.inputEl.addEventListener("keydown",n=>this.onKeydown(n)))}makeTextArea(e){var i,s;let 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+var h={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"},g=class{constructor(e){this.exampleEl=e;var t,i,s,r;this.exampleEl=e,this.anchorEl=e.querySelector("a"),this.errorEl=e.querySelector(h.EXAMPLE_ERROR),this.playButtonEl=e.querySelector(h.PLAY_BUTTON),this.shareButtonEl=e.querySelector(h.SHARE_BUTTON),this.formatButtonEl=e.querySelector(h.FORMAT_BUTTON),this.runButtonEl=e.querySelector(h.RUN_BUTTON),this.inputEl=this.makeTextArea(e.querySelector(h.EXAMPLE_INPUT)),this.outputEl=e.querySelector(h.EXAMPLE_OUTPUT),(t=this.playButtonEl)==null||t.addEventListener("click",()=>this.handleShareButtonClick()),(i=this.shareButtonEl)==null||i.addEventListener("click",()=>this.handleShareButtonClick()),(s=this.formatButtonEl)==null||s.addEventListener("click",()=>this.handleFormatButtonClick()),(r=this.runButtonEl)==null||r.addEventListener("click",()=>this.handleRunButtonClick()),!!this.inputEl&&(this.resize(),this.inputEl.addEventListener("keyup",()=>this.resize()),this.inputEl.addEventListener("keydown",l=>this.onKeydown(l)))}makeTextArea(e){var i,s;let t=document.createElement("textarea");return t.classList.add("Documentation-exampleCode","code"),t.spellcheck=!1,t.value=(i=e==null?void 0:e.textContent)!=null?i:"",(s=e==null?void 0:e.parentElement)==null||s.replaceChild(t,e),t}getAnchorHash(){var e;return(e=this.anchorEl)==null?void 0:e.hash}expand(){this.exampleEl.open=!0}resize(){var e;if((e=this.inputEl)==null?void 0:e.value){let t=(this.inputEl.value.match(/\n/g)||[]).length;this.inputEl.style.height=`${(20+t*20+12+2)/16}rem`}}onKeydown(e){e.key==="Tab"&&(document.execCommand("insertText",!1,"	"),e.preventDefault())}setInputText(e){this.inputEl&&(this.inputEl.value=e)}setOutputText(e){this.outputEl&&(this.outputEl.textContent=e)}setOutputHTML(e){this.outputEl&&(this.outputEl.innerHTML=e)}setErrorText(e){this.errorEl&&(this.errorEl.textContent=e),this.setOutputText("An error has occurred\u2026")}handleShareButtonClick(){var t;let e="https://play.golang.org/p/";this.setOutputText("Waiting for remote server\u2026"),fetch("/play/share",{method:"POST",body:(t=this.inputEl)==null?void 0:t.value}).then(i=>i.text()).then(i=>{let s=e+i;this.setOutputHTML(`<a href="${s}">${s}</a>`),window.open(s)}).catch(i=>{this.setErrorText(i)})}handleFormatButtonClick(){var t,i;this.setOutputText("Waiting for remote server\u2026");let e=new FormData;e.append("body",(i=(t=this.inputEl)==null?void 0:t.value)!=null?i:""),fetch("/play/fmt",{method:"POST",body:e}).then(s=>s.json()).then(({Body:s,Error:r})=>{this.setOutputText(r||"Done."),s&&(this.setInputText(s),this.resize())}).catch(s=>{this.setErrorText(s)})}handleRunButtonClick(){var i,s,r,l;this.setOutputText("Waiting for remote server\u2026");let e=(s=(i=this.inputEl)==null?void 0:i.value)!=null?s:"",t=(l=(r=document.querySelector(".js-playgroundVars"))==null?void 0:r.dataset)!=null?l:{};console.log(t.unitpath),t.pagetype!=="std"&&(e=e.concat(`
+-- go.mod --
+module play.ground
+
+require ${t.unitpath} ${t.version}
+`)),fetch("/play/compile",{method:"POST",body:JSON.stringify({body:e,version:2})}).then(a=>a.json()).then(async({Events:a,Errors:d})=>{this.setOutputText(d||"");for(let u of a||[])this.setOutputText(u.Message),await new Promise(m=>setTimeout(m,u.Delay/1e6))}).catch(a=>{this.setErrorText(a)})}};function y(){let n=location.hash.match(/^#(example-.*)$/);if(n){let i=document.getElementById(n[1]);i&&(i.open=!0)}let e=[...document.querySelectorAll(h.PLAY_HREF)],t=i=>e.find(s=>s.hash===i.getAnchorHash());for(let i of document.querySelectorAll(h.PLAY_CONTAINER)){let s=new g(i),r=t(s);r?r.addEventListener("click",()=>{s.expand()}):console.warn("example href not found")}}var f=class{constructor(e){this.el=e;this.el.addEventListener("change",t=>{let i=t.target,s=i.value;i.value.startsWith("/")||(s="/"+s),window.location.href=s})}};function L(n){let e=document.createElement("label");e.classList.add("go-Label"),e.setAttribute("aria-label","Menu");let t=document.createElement("select");t.classList.add("go-Select","js-selectNav"),e.appendChild(t);let i=document.createElement("optgroup");i.label="Outline",t.appendChild(i);let s={},r;for(let l of n.treeitems){if(Number(l.depth)>4)continue;l.groupTreeitem?(r=s[l.groupTreeitem.label],r||(r=s[l.groupTreeitem.label]=document.createElement("optgroup"),r.label=l.groupTreeitem.label,t.appendChild(r))):r=i;let a=document.createElement("option");a.label=l.label,a.textContent=l.label,a.value=l.el.href.replace(window.location.origin,"").replace("/",""),r.appendChild(a)}return n.addObserver(l=>{var u;let a=l.el.hash,d=(u=t.querySelector(`[value$="${a}"]`))==null?void 0:u.value;d&&(t.value=d)},50),e}var T=class{constructor(e){this.el=e;this.handleResize=()=>{this.el.style.setProperty("--js-tree-height","100vh"),this.el.style.setProperty("--js-tree-height",this.el.clientHeight+"px")};this.treeitems=[],this.firstChars=[],this.firstTreeitem=null,this.lastTreeitem=null,this.observerCallbacks=[],this.init()}init(){this.handleResize(),window.addEventListener("resize",this.handleResize),this.findTreeItems(),this.updateVisibleTreeitems(),this.observeTargets(),this.firstTreeitem&&(this.firstTreeitem.el.tabIndex=0)}observeTargets(){this.addObserver(i=>{this.expandTreeitem(i),this.setSelected(i)});let e=new Map,t=new IntersectionObserver(i=>{for(let s of i)e.set(s.target.id,s.isIntersecting||s.intersectionRatio===1);for(let[s,r]of e)if(r){let l=this.treeitems.find(a=>{var d;return(d=a.el)==null?void 0:d.href.endsWith(`#${s}`)});if(l)for(let a of this.observerCallbacks)a(l);break}},{threshold:1,rootMargin:"-60px 0px 0px 0px"});for(let i of this.treeitems.map(s=>s.el.getAttribute("href")))if(i){let s=i.replace(window.location.origin,"").replace("/","").replace("#",""),r=document.getElementById(s);r&&t.observe(r)}}addObserver(e,t=200){this.observerCallbacks.push(M(e,t))}setFocusToNextItem(e){let t=null;for(let i=e.index+1;i<this.treeitems.length;i++){let s=this.treeitems[i];if(s.isVisible){t=s;break}}t&&this.setFocusToItem(t)}setFocusToPreviousItem(e){let t=null;for(let i=e.index-1;i>-1;i--){let s=this.treeitems[i];if(s.isVisible){t=s;break}}t&&this.setFocusToItem(t)}setFocusToParentItem(e){e.groupTreeitem&&this.setFocusToItem(e.groupTreeitem)}setFocusToFirstItem(){this.firstTreeitem&&this.setFocusToItem(this.firstTreeitem)}setFocusToLastItem(){this.lastTreeitem&&this.setFocusToItem(this.lastTreeitem)}setSelected(e){var t;for(let i of this.el.querySelectorAll('[aria-expanded="true"]'))i!==e.el&&(((t=i.nextElementSibling)==null?void 0:t.contains(e.el))||i.setAttribute("aria-expanded","false"));for(let i of this.el.querySelectorAll("[aria-selected]"))i!==e.el&&i.setAttribute("aria-selected","false");e.el.setAttribute("aria-selected","true"),this.updateVisibleTreeitems(),this.setFocusToItem(e,!1)}expandTreeitem(e){let t=e;for(;t;)t.isExpandable&&t.el.setAttribute("aria-expanded","true"),t=t.groupTreeitem;this.updateVisibleTreeitems()}expandAllSiblingItems(e){for(let t of this.treeitems)t.groupTreeitem===e.groupTreeitem&&t.isExpandable&&this.expandTreeitem(t)}collapseTreeitem(e){let t=null;e.isExpanded()?t=e:t=e.groupTreeitem,t&&(t.el.setAttribute("aria-expanded","false"),this.updateVisibleTreeitems(),this.setFocusToItem(t))}setFocusByFirstCharacter(e,t){let i,s;t=t.toLowerCase(),i=e.index+1,i===this.treeitems.length&&(i=0),s=this.getIndexFirstChars(i,t),s===-1&&(s=this.getIndexFirstChars(0,t)),s>-1&&this.setFocusToItem(this.treeitems[s])}findTreeItems(){let e=(t,i)=>{let s=i,r=t.firstElementChild;for(;r;)(r.tagName==="A"||r.tagName==="SPAN")&&(s=new A(r,this,i),this.treeitems.push(s),this.firstChars.push(s.label.substring(0,1).toLowerCase())),r.firstElementChild&&e(r,s),r=r.nextElementSibling};e(this.el,null),this.treeitems.map((t,i)=>t.index=i)}updateVisibleTreeitems(){this.firstTreeitem=this.treeitems[0];for(let e of this.treeitems){let t=e.groupTreeitem;for(e.isVisible=!0;t&&t.el!==this.el;)t.isExpanded()||(e.isVisible=!1),t=t.groupTreeitem;e.isVisible&&(this.lastTreeitem=e)}}setFocusToItem(e,t=!0){e.el.tabIndex=0,t&&e.el.focus();for(let i of this.treeitems)i!==e&&(i.el.tabIndex=-1)}getIndexFirstChars(e,t){for(let i=e;i<this.firstChars.length;i++)if(this.treeitems[i].isVisible&&t===this.firstChars[i])return i;return-1}},A=class{constructor(e,t,i){var l,a,d,u,m;e.tabIndex=-1,this.el=e,this.groupTreeitem=i,this.label=(a=(l=e.textContent)==null?void 0:l.trim())!=null?a:"",this.tree=t,this.depth=((i==null?void 0:i.depth)||0)+1,this.index=0;let s=e.parentElement;(s==null?void 0:s.tagName.toLowerCase())==="li"&&(s==null||s.setAttribute("role","none")),e.setAttribute("aria-level",this.depth+""),e.getAttribute("aria-label")&&(this.label=(u=(d=e==null?void 0:e.getAttribute("aria-label"))==null?void 0:d.trim())!=null?u:""),this.isExpandable=!1,this.isVisible=!1,this.isInGroup=!!i;let r=e.nextElementSibling;for(;r;){if(r.tagName.toLowerCase()=="ul"){let x=`${(m=i==null?void 0:i.label)!=null?m:""} nav group ${this.label}`.replace(/[\W_]+/g,"_");e.setAttribute("aria-owns",x),e.setAttribute("aria-expanded","false"),r.setAttribute("role","group"),r.setAttribute("id",x),this.isExpandable=!0;break}r=r.nextElementSibling}this.init()}init(){this.el.tabIndex=-1,this.el.getAttribute("role")||this.el.setAttribute("role","treeitem"),this.el.addEventListener("keydown",this.handleKeydown.bind(this)),this.el.addEventListener("click",this.handleClick.bind(this)),this.el.addEventListener("focus",this.handleFocus.bind(this)),this.el.addEventListener("blur",this.handleBlur.bind(this))}isExpanded(){return this.isExpandable?this.el.getAttribute("aria-expanded")==="true":!1}isSelected(){return this.el.getAttribute("aria-selected")==="true"}handleClick(e){e.target!==this.el&&e.target!==this.el.firstElementChild||(this.isExpandable&&(this.isExpanded()&&this.isSelected()?this.tree.collapseTreeitem(this):this.tree.expandTreeitem(this),e.stopPropagation()),this.tree.setSelected(this))}handleFocus(){var t;let e=this.el;this.isExpandable&&(e=(t=e.firstElementChild)!=null?t:e),e.classList.add("focus")}handleBlur(){var t;let e=this.el;this.isExpandable&&(e=(t=e.firstElementChild)!=null?t:e),e.classList.remove("focus")}handleKeydown(e){if(e.altKey||e.ctrlKey||e.metaKey)return;let t=!1;switch(e.key){case" ":case"Enter":this.isExpandable?(this.isExpanded()&&this.isSelected()?this.tree.collapseTreeitem(this):this.tree.expandTreeitem(this),t=!0):e.stopPropagation(),this.tree.setSelected(this);break;case"ArrowUp":this.tree.setFocusToPreviousItem(this),t=!0;break;case"ArrowDown":this.tree.setFocusToNextItem(this),t=!0;break;case"ArrowRight":this.isExpandable&&(this.isExpanded()?this.tree.setFocusToNextItem(this):this.tree.expandTreeitem(this)),t=!0;break;case"ArrowLeft":this.isExpandable&&this.isExpanded()?(this.tree.collapseTreeitem(this),t=!0):this.isInGroup&&(this.tree.setFocusToParentItem(this),t=!0);break;case"Home":this.tree.setFocusToFirstItem(),t=!0;break;case"End":this.tree.setFocusToLastItem(),t=!0;break;default:e.key.length===1&&e.key.match(/\S/)&&(e.key=="*"?this.tree.expandAllSiblingItems(this):this.tree.setFocusByFirstCharacter(this,e.key),t=!0);break}t&&(e.stopPropagation(),e.preventDefault())}};function M(n,e){let t;return(...i)=>{let 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f(e.firstElementChild)}var 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c(){history.replaceState(null,"",`${location.pathname}#section-readme`),o==null||o.classList.add("UnitReadme--expanded")}function w(){var t;if(!location.hash)return;let n=document.getElementById(location.hash.slice(1)),e=(t=n==null?void 0:n.parentElement)==null?void 0:t.parentElement;(e==null?void 0:e.nodeName)==="DETAILS"&&(e.open=!0)}w();window.addEventListener("hashchange",()=>w());document.querySelectorAll(".js-buildContextSelect").forEach(n=>{n.addEventListener("change",e=>{window.location.search=`?GOOS=${e.target.value}`})});
 /*!
  * @license
  * Copyright 2020 The Go Authors. All rights reserved.
diff --git a/static/frontend/unit/main/main.js.map b/static/frontend/unit/main/main.js.map
index 4ddd214..540f8ab 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/playground/playground.ts", "../../../shared/outline/select.ts", "../../../shared/outline/tree.ts", "../../../shared/table/table.ts", "main.ts"],
-  "sourcesContent": ["/*!\n * @license\n * Copyright 2021 The Go Authors. All rights reserved.\n * Use of this source code is governed by a BSD-style\n * license that can be found in the LICENSE file.\n */\n\n// This file implements the playground implementation of the documentation\n// page. The playground involves a \"play\" button that allows you to open up\n// a new link to play.golang.org using the example code.\n\n// The CSS is in static/frontend/unit/main/_doc.css\n\n/**\n * CSS classes used by PlaygroundExampleController\n */\nconst PlayExampleClassName = {\n  PLAY_HREF: '.js-exampleHref',\n  PLAY_CONTAINER: '.js-exampleContainer',\n  EXAMPLE_INPUT: '.Documentation-exampleCode',\n  EXAMPLE_OUTPUT: '.Documentation-exampleOutput',\n  EXAMPLE_ERROR: '.Documentation-exampleError',\n  PLAY_BUTTON: '.Documentation-examplePlayButton',\n  SHARE_BUTTON: '.Documentation-exampleShareButton',\n  FORMAT_BUTTON: '.Documentation-exampleFormatButton',\n  RUN_BUTTON: '.Documentation-exampleRunButton',\n};\n\n/**\n * This controller enables playground examples to expand their dropdown or\n * generate shareable Go Playground URLs.\n */\nexport class PlaygroundExampleController {\n  /**\n   * The anchor tag used to identify the container with an example href.\n   * There is only one in an example container div.\n   */\n  private readonly anchorEl: HTMLAnchorElement | null;\n\n  /**\n   * The error element\n   */\n  private readonly errorEl: Element | null;\n\n  /**\n   * Buttons that redirect to an example's playground, this element\n   * only exists in executable examples.\n   */\n  private readonly playButtonEl: Element | null;\n  private readonly shareButtonEl: Element | null;\n\n  /**\n   * Button that formats the code in an example's playground.\n   */\n  private readonly formatButtonEl: Element | null;\n\n  /**\n   * Button that runs the code in an example's playground, this element\n   * only exists in executable examples.\n   */\n  private readonly runButtonEl: Element | null;\n\n  /**\n   * The executable code of an example.\n   */\n  private readonly inputEl: HTMLTextAreaElement | null;\n\n  /**\n   * The output of the given example code. This only exists if the\n   * author of the package provides an output for this example.\n   */\n  private readonly outputEl: Element | null;\n\n  /**\n   * @param exampleEl The div that contains playground content for the given example.\n   */\n  constructor(private readonly exampleEl: HTMLDetailsElement) {\n    this.exampleEl = exampleEl;\n    this.anchorEl = exampleEl.querySelector('a');\n    this.errorEl = exampleEl.querySelector(PlayExampleClassName.EXAMPLE_ERROR);\n    this.playButtonEl = exampleEl.querySelector(PlayExampleClassName.PLAY_BUTTON);\n    this.shareButtonEl = exampleEl.querySelector(PlayExampleClassName.SHARE_BUTTON);\n    this.formatButtonEl = exampleEl.querySelector(PlayExampleClassName.FORMAT_BUTTON);\n    this.runButtonEl = exampleEl.querySelector(PlayExampleClassName.RUN_BUTTON);\n    this.inputEl = this.makeTextArea(exampleEl.querySelector(PlayExampleClassName.EXAMPLE_INPUT));\n    this.outputEl = exampleEl.querySelector(PlayExampleClassName.EXAMPLE_OUTPUT);\n\n    // This is legacy listener to be replaced the listener for shareButtonEl.\n    this.playButtonEl?.addEventListener('click', () => this.handleShareButtonClick());\n    this.shareButtonEl?.addEventListener('click', () => this.handleShareButtonClick());\n    this.formatButtonEl?.addEventListener('click', () => this.handleFormatButtonClick());\n    this.runButtonEl?.addEventListener('click', () => this.handleRunButtonClick());\n\n    if (!this.inputEl) return;\n\n    this.resize();\n    this.inputEl.addEventListener('keyup', () => this.resize());\n    this.inputEl.addEventListener('keydown', e => this.onKeydown(e));\n  }\n\n  /**\n   * Replace the pre element with a textarea. The examples are initially rendered\n   * as pre elements so they're fully visible when JS is disabled.\n   */\n  makeTextArea(el: Element | null): HTMLTextAreaElement {\n    const t = document.createElement('textarea');\n    t.classList.add('Documentation-exampleCode', 'code');\n    t.spellcheck = false;\n    t.value = el?.textContent ?? '';\n    el?.parentElement?.replaceChild(t, el);\n    return t;\n  }\n\n  /**\n   * Retrieve the hash value of the anchor element.\n   */\n  getAnchorHash(): string | undefined {\n    return this.anchorEl?.hash;\n  }\n\n  /**\n   * Expands the current playground example.\n   */\n  expand(): void {\n    this.exampleEl.open = true;\n  }\n\n  /**\n   * Resizes the input element to accommodate the amount of text present.\n   */\n  private resize(): void {\n    if (this.inputEl?.value) {\n      const numLineBreaks = (this.inputEl.value.match(/\\n/g) || []).length;\n      // min-height + lines x line-height + padding + border\n      this.inputEl.style.height = `${(20 + numLineBreaks * 20 + 12 + 2) / 16}rem`;\n    }\n  }\n\n  /**\n   * Handler to override keyboard behavior in the playground's\n   * textarea element.\n   *\n   * Tab key inserts tabs into the example playground instead of\n   * switching to the next interactive element.\n   * @param e input element keyboard event.\n   */\n  private onKeydown(e: KeyboardEvent) {\n    if (e.key === 'Tab') {\n      document.execCommand('insertText', false, '\\t');\n      e.preventDefault();\n    }\n  }\n\n  /**\n   * Changes the text of the example's input box.\n   */\n  private setInputText(output: string) {\n    if (this.inputEl) {\n      this.inputEl.value = output;\n    }\n  }\n\n  /**\n   * Changes the text of the example's output box.\n   */\n  private setOutputText(output: string) {\n    if (this.outputEl) {\n      this.outputEl.textContent = output;\n    }\n  }\n\n  private setOutputHTML(output: string) {\n    if (this.outputEl) {\n      this.outputEl.innerHTML = output;\n    }\n  }\n\n  /**\n   * Sets the error message text and overwrites\n   * output box to indicate a failed response.\n   */\n  private setErrorText(err: string) {\n    if (this.errorEl) {\n      this.errorEl.textContent = err;\n    }\n    this.setOutputText('An error has occurred\u2026');\n  }\n\n  /**\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.setOutputHTML(`<a href=\"${href}\">${href}</a>`);\n        window.open(href);\n      })\n      .catch(err => {\n        this.setErrorText(err);\n      });\n  }\n\n  /**\n   * Runs gofmt on the example snippet in the playground.\n   */\n  private handleFormatButtonClick() {\n    this.setOutputText('Waiting for remote server\u2026');\n    const body = new FormData();\n    body.append('body', this.inputEl?.value ?? '');\n\n    fetch('/play/fmt', {\n      method: 'POST',\n      body: body,\n    })\n      .then(res => res.json())\n      .then(({ Body, Error }) => {\n        this.setOutputText(Error || 'Done.');\n        if (Body) {\n          this.setInputText(Body);\n          this.resize();\n        }\n      })\n      .catch(err => {\n        this.setErrorText(err);\n      });\n  }\n\n  /**\n   * Runs the code snippet in the example playground.\n   */\n  private handleRunButtonClick() {\n    this.setOutputText('Waiting for remote server\u2026');\n\n    fetch('/play/compile', {\n      method: 'POST',\n      body: JSON.stringify({ body: this.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 2021 The Go Authors. All rights reserved.\n * Use of this source code is governed by a BSD-style\n * license that can be found in the LICENSE file.\n */\n\nimport { TreeNavController } from './tree.js';\n\nexport class SelectNavController {\n  constructor(private el: Element) {\n    this.el.addEventListener('change', e => {\n      const target = e.target as HTMLSelectElement;\n      let href = target.value;\n      if (!target.value.startsWith('/')) {\n        href = '/' + href;\n      }\n      window.location.href = href;\n    });\n  }\n}\n\nexport function makeSelectNav(tree: TreeNavController): HTMLLabelElement {\n  const label = document.createElement('label');\n  label.classList.add('go-Label');\n  label.setAttribute('aria-label', 'Menu');\n  const select = document.createElement('select');\n  select.classList.add('go-Select', 'js-selectNav');\n  label.appendChild(select);\n  const outline = document.createElement('optgroup');\n  outline.label = 'Outline';\n  select.appendChild(outline);\n  const groupMap: Record<string, HTMLOptGroupElement> = {};\n  let group: HTMLOptGroupElement;\n  for (const t of tree.treeitems) {\n    if (Number(t.depth) > 4) continue;\n    if (t.groupTreeitem) {\n      group = groupMap[t.groupTreeitem.label];\n      if (!group) {\n        group = groupMap[t.groupTreeitem.label] = document.createElement('optgroup');\n        group.label = t.groupTreeitem.label;\n        select.appendChild(group);\n      }\n    } else {\n      group = outline;\n    }\n    const o = document.createElement('option');\n    o.label = t.label;\n    o.textContent = t.label;\n    o.value = (t.el as HTMLAnchorElement).href.replace(window.location.origin, '').replace('/', '');\n    group.appendChild(o);\n  }\n  tree.addObserver(t => {\n    const hash = (t.el as HTMLAnchorElement).hash;\n    const value = select.querySelector<HTMLOptionElement>(`[value$=\"${hash}\"]`)?.value;\n    if (value) {\n      select.value = value;\n    }\n  }, 50);\n  return label;\n}\n", "/**\n * @license\n * Copyright 2021 The Go Authors. All rights reserved.\n * Use of this source code is governed by a BSD-style\n * license that can be found in the LICENSE file.\n */\n\n/**\n * TreeNavController is the navigation tree component of the documentation page.\n * It adds accessiblity attributes to a tree, observes the heading elements\n * focus the topmost link for headings visible on the page, and implements the\n * WAI-ARIA Treeview Design Pattern with full\n * [keyboard support](https://www.w3.org/TR/wai-aria-practices/examples/treeview/treeview-2/treeview-2a.html#kbd_label).\n */\nexport class TreeNavController {\n  treeitems: TreeItem[];\n\n  /**\n   * firstChars is the first character of each treeitem in the same order\n   * as this.treeitems. We use this array to set focus by character when\n   * navigating the tree with a keyboard.\n   */\n  private firstChars: string[];\n  private firstTreeitem: TreeItem | null;\n  private lastTreeitem: TreeItem | null;\n  private observerCallbacks: ((t: TreeItem) => void)[];\n\n  constructor(private el: HTMLElement) {\n    this.treeitems = [];\n    this.firstChars = [];\n    this.firstTreeitem = null;\n    this.lastTreeitem = null;\n    this.observerCallbacks = [];\n    this.init();\n  }\n\n  private init(): void {\n    this.handleResize();\n    window.addEventListener('resize', this.handleResize);\n    this.findTreeItems();\n    this.updateVisibleTreeitems();\n    this.observeTargets();\n    if (this.firstTreeitem) {\n      this.firstTreeitem.el.tabIndex = 0;\n    }\n  }\n\n  private handleResize = (): void => {\n    this.el.style.setProperty('--js-tree-height', '100vh');\n    this.el.style.setProperty('--js-tree-height', this.el.clientHeight + 'px');\n  };\n\n  private observeTargets() {\n    this.addObserver(treeitem => {\n      this.expandTreeitem(treeitem);\n      this.setSelected(treeitem);\n      // TODO: Fix scroll issue in https://golang.org/issue/47450.\n      // treeitem.el.scrollIntoView({ block: 'nearest' });\n    });\n\n    const targets = new Map<string, boolean>();\n    const observer = new IntersectionObserver(\n      entries => {\n        for (const entry of entries) {\n          targets.set(entry.target.id, entry.isIntersecting || entry.intersectionRatio === 1);\n        }\n        for (const [id, isIntersecting] of targets) {\n          if (isIntersecting) {\n            const active = this.treeitems.find(t =>\n              (t.el as HTMLAnchorElement)?.href.endsWith(`#${id}`)\n            );\n            if (active) {\n              for (const fn of this.observerCallbacks) {\n                fn(active);\n              }\n            }\n            break;\n          }\n        }\n      },\n      {\n        threshold: 1.0,\n        rootMargin: '-60px 0px 0px 0px',\n      }\n    );\n\n    for (const href of this.treeitems.map(t => t.el.getAttribute('href'))) {\n      if (href) {\n        const id = href.replace(window.location.origin, '').replace('/', '').replace('#', '');\n        const target = document.getElementById(id);\n        if (target) {\n          observer.observe(target);\n        }\n      }\n    }\n  }\n\n  addObserver(fn: (t: TreeItem) => void, delay = 200): void {\n    this.observerCallbacks.push(debounce(fn, delay));\n  }\n\n  setFocusToNextItem(currentItem: TreeItem): void {\n    let nextItem = null;\n    for (let i = currentItem.index + 1; i < this.treeitems.length; i++) {\n      const ti = this.treeitems[i];\n      if (ti.isVisible) {\n        nextItem = ti;\n        break;\n      }\n    }\n    if (nextItem) {\n      this.setFocusToItem(nextItem);\n    }\n  }\n\n  setFocusToPreviousItem(currentItem: TreeItem): void {\n    let prevItem = null;\n    for (let i = currentItem.index - 1; i > -1; i--) {\n      const ti = this.treeitems[i];\n      if (ti.isVisible) {\n        prevItem = ti;\n        break;\n      }\n    }\n    if (prevItem) {\n      this.setFocusToItem(prevItem);\n    }\n  }\n\n  setFocusToParentItem(currentItem: TreeItem): void {\n    if (currentItem.groupTreeitem) {\n      this.setFocusToItem(currentItem.groupTreeitem);\n    }\n  }\n\n  setFocusToFirstItem(): void {\n    this.firstTreeitem && this.setFocusToItem(this.firstTreeitem);\n  }\n\n  setFocusToLastItem(): void {\n    this.lastTreeitem && this.setFocusToItem(this.lastTreeitem);\n  }\n\n  setSelected(currentItem: TreeItem): void {\n    for (const l1 of this.el.querySelectorAll('[aria-expanded=\"true\"]')) {\n      if (l1 === currentItem.el) continue;\n      if (!l1.nextElementSibling?.contains(currentItem.el)) {\n        l1.setAttribute('aria-expanded', 'false');\n      }\n    }\n    for (const l1 of this.el.querySelectorAll('[aria-selected]')) {\n      if (l1 !== currentItem.el) {\n        l1.setAttribute('aria-selected', 'false');\n      }\n    }\n    currentItem.el.setAttribute('aria-selected', 'true');\n    this.updateVisibleTreeitems();\n    this.setFocusToItem(currentItem, false);\n  }\n\n  expandTreeitem(treeitem: TreeItem): void {\n    let currentItem: TreeItem | null = treeitem;\n    while (currentItem) {\n      if (currentItem.isExpandable) {\n        currentItem.el.setAttribute('aria-expanded', 'true');\n      }\n      currentItem = currentItem.groupTreeitem;\n    }\n    this.updateVisibleTreeitems();\n  }\n\n  expandAllSiblingItems(currentItem: TreeItem): void {\n    for (const ti of this.treeitems) {\n      if (ti.groupTreeitem === currentItem.groupTreeitem && ti.isExpandable) {\n        this.expandTreeitem(ti);\n      }\n    }\n  }\n\n  collapseTreeitem(currentItem: TreeItem): void {\n    let groupTreeitem = null;\n\n    if (currentItem.isExpanded()) {\n      groupTreeitem = currentItem;\n    } else {\n      groupTreeitem = currentItem.groupTreeitem;\n    }\n\n    if (groupTreeitem) {\n      groupTreeitem.el.setAttribute('aria-expanded', 'false');\n      this.updateVisibleTreeitems();\n      this.setFocusToItem(groupTreeitem);\n    }\n  }\n\n  setFocusByFirstCharacter(currentItem: TreeItem, char: string): void {\n    let start: number, index: number;\n    char = char.toLowerCase();\n\n    // Get start index for search based on position of currentItem\n    start = currentItem.index + 1;\n    if (start === this.treeitems.length) {\n      start = 0;\n    }\n\n    // Check remaining slots in the menu\n    index = this.getIndexFirstChars(start, char);\n\n    // If not found in remaining slots, check from beginning\n    if (index === -1) {\n      index = this.getIndexFirstChars(0, char);\n    }\n\n    // If match was found...\n    if (index > -1) {\n      this.setFocusToItem(this.treeitems[index]);\n    }\n  }\n\n  private findTreeItems() {\n    const findItems = (el: HTMLElement, group: TreeItem | null) => {\n      let ti = group;\n      let curr = el.firstElementChild as HTMLElement;\n      while (curr) {\n        if (curr.tagName === 'A' || curr.tagName === 'SPAN') {\n          ti = new TreeItem(curr, this, group);\n          this.treeitems.push(ti);\n          this.firstChars.push(ti.label.substring(0, 1).toLowerCase());\n        }\n        if (curr.firstElementChild) {\n          findItems(curr, ti);\n        }\n        curr = curr.nextElementSibling as HTMLElement;\n      }\n    };\n    findItems(this.el as HTMLElement, null);\n    this.treeitems.map((ti, idx) => (ti.index = idx));\n  }\n\n  private updateVisibleTreeitems(): void {\n    this.firstTreeitem = this.treeitems[0];\n\n    for (const ti of this.treeitems) {\n      let parent = ti.groupTreeitem;\n      ti.isVisible = true;\n      while (parent && parent.el !== this.el) {\n        if (!parent.isExpanded()) {\n          ti.isVisible = false;\n        }\n        parent = parent.groupTreeitem;\n      }\n      if (ti.isVisible) {\n        this.lastTreeitem = ti;\n      }\n    }\n  }\n\n  private setFocusToItem(treeitem: TreeItem, focusEl = true) {\n    treeitem.el.tabIndex = 0;\n    if (focusEl) {\n      treeitem.el.focus();\n    }\n    for (const ti of this.treeitems) {\n      if (ti !== treeitem) {\n        ti.el.tabIndex = -1;\n      }\n    }\n  }\n\n  private getIndexFirstChars(startIndex: number, char: string): number {\n    for (let i = startIndex; i < this.firstChars.length; i++) {\n      if (this.treeitems[i].isVisible && char === this.firstChars[i]) {\n        return i;\n      }\n    }\n    return -1;\n  }\n}\n\nclass TreeItem {\n  el: HTMLElement;\n  groupTreeitem: TreeItem | null;\n  label: string;\n  isExpandable: boolean;\n  isVisible: boolean;\n  depth: number;\n  index: number;\n\n  private tree: TreeNavController;\n  private isInGroup: boolean;\n\n  constructor(el: HTMLElement, treeObj: TreeNavController, group: TreeItem | null) {\n    el.tabIndex = -1;\n    this.el = el;\n    this.groupTreeitem = group;\n    this.label = el.textContent?.trim() ?? '';\n    this.tree = treeObj;\n    this.depth = (group?.depth || 0) + 1;\n    this.index = 0;\n\n    const parent = el.parentElement;\n    if (parent?.tagName.toLowerCase() === 'li') {\n      parent?.setAttribute('role', 'none');\n    }\n    el.setAttribute('aria-level', this.depth + '');\n    if (el.getAttribute('aria-label')) {\n      this.label = el?.getAttribute('aria-label')?.trim() ?? '';\n    }\n\n    this.isExpandable = false;\n    this.isVisible = false;\n    this.isInGroup = !!group;\n\n    let curr = el.nextElementSibling;\n    while (curr) {\n      if (curr.tagName.toLowerCase() == 'ul') {\n        const groupId = `${group?.label ?? ''} nav group ${this.label}`.replace(/[\\W_]+/g, '_');\n        el.setAttribute('aria-owns', groupId);\n        el.setAttribute('aria-expanded', 'false');\n        curr.setAttribute('role', 'group');\n        curr.setAttribute('id', groupId);\n        this.isExpandable = true;\n        break;\n      }\n\n      curr = curr.nextElementSibling;\n    }\n    this.init();\n  }\n\n  private init() {\n    this.el.tabIndex = -1;\n    if (!this.el.getAttribute('role')) {\n      this.el.setAttribute('role', 'treeitem');\n    }\n    this.el.addEventListener('keydown', this.handleKeydown.bind(this));\n    this.el.addEventListener('click', this.handleClick.bind(this));\n    this.el.addEventListener('focus', this.handleFocus.bind(this));\n    this.el.addEventListener('blur', this.handleBlur.bind(this));\n  }\n\n  isExpanded() {\n    if (this.isExpandable) {\n      return this.el.getAttribute('aria-expanded') === 'true';\n    }\n\n    return false;\n  }\n\n  isSelected() {\n    return this.el.getAttribute('aria-selected') === 'true';\n  }\n\n  private handleClick(event: MouseEvent) {\n    // only process click events that directly happened on this treeitem\n    if (event.target !== this.el && event.target !== this.el.firstElementChild) {\n      return;\n    }\n    if (this.isExpandable) {\n      if (this.isExpanded() && this.isSelected()) {\n        this.tree.collapseTreeitem(this);\n      } else {\n        this.tree.expandTreeitem(this);\n      }\n      event.stopPropagation();\n    }\n    this.tree.setSelected(this);\n  }\n\n  private handleFocus() {\n    let el = this.el;\n    if (this.isExpandable) {\n      el = (el.firstElementChild as HTMLElement) ?? el;\n    }\n    el.classList.add('focus');\n  }\n\n  private handleBlur() {\n    let el = this.el;\n    if (this.isExpandable) {\n      el = (el.firstElementChild as HTMLElement) ?? el;\n    }\n    el.classList.remove('focus');\n  }\n\n  private handleKeydown(event: KeyboardEvent) {\n    if (event.altKey || event.ctrlKey || event.metaKey) {\n      return;\n    }\n\n    let captured = false;\n    switch (event.key) {\n      case ' ':\n      case 'Enter':\n        if (this.isExpandable) {\n          if (this.isExpanded() && this.isSelected()) {\n            this.tree.collapseTreeitem(this);\n          } else {\n            this.tree.expandTreeitem(this);\n          }\n          captured = true;\n        } else {\n          event.stopPropagation();\n        }\n        this.tree.setSelected(this);\n        break;\n\n      case 'ArrowUp':\n        this.tree.setFocusToPreviousItem(this);\n        captured = true;\n        break;\n\n      case 'ArrowDown':\n        this.tree.setFocusToNextItem(this);\n        captured = true;\n        break;\n\n      case 'ArrowRight':\n        if (this.isExpandable) {\n          if (this.isExpanded()) {\n            this.tree.setFocusToNextItem(this);\n          } else {\n            this.tree.expandTreeitem(this);\n          }\n        }\n        captured = true;\n        break;\n\n      case 'ArrowLeft':\n        if (this.isExpandable && this.isExpanded()) {\n          this.tree.collapseTreeitem(this);\n          captured = true;\n        } else {\n          if (this.isInGroup) {\n            this.tree.setFocusToParentItem(this);\n            captured = true;\n          }\n        }\n        break;\n\n      case 'Home':\n        this.tree.setFocusToFirstItem();\n        captured = true;\n        break;\n\n      case 'End':\n        this.tree.setFocusToLastItem();\n        captured = true;\n        break;\n\n      default:\n        if (event.key.length === 1 && event.key.match(/\\S/)) {\n          if (event.key == '*') {\n            this.tree.expandAllSiblingItems(this);\n          } else {\n            this.tree.setFocusByFirstCharacter(this, event.key);\n          }\n          captured = true;\n        }\n        break;\n    }\n\n    if (captured) {\n      event.stopPropagation();\n      event.preventDefault();\n    }\n  }\n}\n\n// eslint-disable-next-line @typescript-eslint/no-explicit-any\nfunction debounce<T extends (...args: any[]) => any>(func: T, wait: number) {\n  let timeout: ReturnType<typeof setTimeout> | null;\n  return (...args: Parameters<T>) => {\n    const later = () => {\n      timeout = null;\n      func(...args);\n    };\n    if (timeout) {\n      clearTimeout(timeout);\n    }\n    timeout = setTimeout(later, wait);\n  };\n}\n", "/*!\n * @license\n * Copyright 2020 The Go Authors. All rights reserved.\n * Use of this source code is governed by a BSD-style\n * license that can be found in the LICENSE file.\n */\n\n/**\n * Controller for a table element with expandable rows. Adds event listeners to\n * a toggle within a table row that controls visiblity of additional related\n * rows in the table.\n *\n * @example\n * ```typescript\n * import {ExpandableRowsTableController} from '/static/js/table';\n *\n * const el = document .querySelector<HTMLTableElement>('.js-myTableElement')\n * new ExpandableRowsTableController(el));\n * ```\n */\nexport class ExpandableRowsTableController {\n  private rows: HTMLTableRowElement[];\n  private toggles: HTMLButtonElement[];\n\n  /**\n   * Create a table controller.\n   * @param table - The table element to which the controller binds.\n   */\n  constructor(private table: HTMLTableElement, private toggleAll?: HTMLButtonElement | null) {\n    this.rows = Array.from(table.querySelectorAll<HTMLTableRowElement>('[data-aria-controls]'));\n    this.toggles = Array.from(this.table.querySelectorAll('[aria-expanded]'));\n    this.setAttributes();\n    this.attachEventListeners();\n    this.update();\n  }\n\n  /**\n   * setAttributes sets data-aria-* and data-id attributes to regular\n   * html attributes as a workaround for limitations from safehtml.\n   */\n  private setAttributes() {\n    for (const a of ['data-aria-controls', 'data-aria-labelledby', 'data-id']) {\n      this.table.querySelectorAll(`[${a}]`).forEach(t => {\n        t.setAttribute(a.replace('data-', ''), t.getAttribute(a) ?? '');\n        t.removeAttribute(a);\n      });\n    }\n  }\n\n  private attachEventListeners() {\n    this.rows.forEach(t => {\n      t.addEventListener('click', e => {\n        this.handleToggleClick(e);\n      });\n    });\n    this.toggleAll?.addEventListener('click', () => {\n      this.expandAllItems();\n    });\n\n    document.addEventListener('keydown', e => {\n      if ((e.ctrlKey || e.metaKey) && e.key === 'f') {\n        this.expandAllItems();\n      }\n    });\n  }\n\n  private handleToggleClick(e: MouseEvent) {\n    let target = e.currentTarget as HTMLTableRowElement | null;\n    if (!target?.hasAttribute('aria-expanded')) {\n      target = this.table.querySelector(\n        `button[aria-controls=\"${target?.getAttribute('aria-controls')}\"]`\n      );\n    }\n    const isExpanded = target?.getAttribute('aria-expanded') === 'true';\n    target?.setAttribute('aria-expanded', isExpanded ? 'false' : 'true');\n    e.stopPropagation();\n    this.update();\n  }\n\n  expandAllItems = (): void => {\n    this.toggles.map(t => t.setAttribute('aria-expanded', 'true'));\n    this.update();\n  };\n\n  private collapseAllItems = () => {\n    this.toggles.map(t => t.setAttribute('aria-expanded', 'false'));\n    this.update();\n  };\n\n  private update = () => {\n    this.updateVisibleItems();\n    setTimeout(() => this.updateGlobalToggle());\n  };\n\n  private updateVisibleItems() {\n    this.rows.map(t => {\n      const isExpanded = t?.getAttribute('aria-expanded') === 'true';\n      const rowIds = t?.getAttribute('aria-controls')?.trimEnd().split(' ');\n      rowIds?.map(id => {\n        const target = document.getElementById(`${id}`);\n        if (isExpanded) {\n          target?.classList.add('visible');\n          target?.classList.remove('hidden');\n        } else {\n          target?.classList.add('hidden');\n          target?.classList.remove('visible');\n        }\n      });\n    });\n  }\n\n  private updateGlobalToggle() {\n    if (!this.toggleAll) return;\n    if (this.rows.some(t => t.hasAttribute('aria-expanded'))) {\n      this.toggleAll.style.display = 'block';\n    }\n    const someCollapsed = this.toggles.some(el => el.getAttribute('aria-expanded') === 'false');\n    if (someCollapsed) {\n      this.toggleAll.innerText = 'Expand all';\n      this.toggleAll.onclick = this.expandAllItems;\n    } else {\n      this.toggleAll.innerText = 'Collapse all';\n      this.toggleAll.onclick = this.collapseAllItems;\n    }\n  }\n}\n", "import { initPlaygrounds } from 'static/shared/playground/playground';\nimport { SelectNavController, makeSelectNav } from 'static/shared/outline/select';\nimport { TreeNavController } from 'static/shared/outline/tree';\nimport { ExpandableRowsTableController } from 'static/shared/table/table';\n\ninitPlaygrounds();\n\nconst directories = document.querySelector<HTMLTableElement>('.js-expandableTable');\nif (directories) {\n  const table = new ExpandableRowsTableController(\n    directories,\n    document.querySelector<HTMLButtonElement>('.js-expandAllDirectories')\n  );\n  // Expand directories on page load with expand-directories query param.\n  if (window.location.search.includes('expand-directories')) {\n    table.expandAllItems();\n  }\n}\n\nconst treeEl = document.querySelector<HTMLElement>('.js-tree');\nif (treeEl) {\n  const treeCtrl = new TreeNavController(treeEl);\n  const select = makeSelectNav(treeCtrl);\n  const mobileNav = document.querySelector('.js-mainNavMobile');\n  if (mobileNav && mobileNav.firstElementChild) {\n    mobileNav?.replaceChild(select, mobileNav.firstElementChild);\n  }\n  if (select.firstElementChild) {\n    new SelectNavController(select.firstElementChild);\n  }\n}\n\n/**\n * Event handlers for expanding and collapsing the readme section.\n */\nconst readme = document.querySelector('.js-readme');\nconst readmeContent = document.querySelector('.js-readmeContent');\nconst readmeOutline = document.querySelector('.js-readmeOutline');\nconst readmeExpand = document.querySelectorAll('.js-readmeExpand');\nconst readmeCollapse = document.querySelector('.js-readmeCollapse');\nconst mobileNavSelect = document.querySelector<HTMLSelectElement>('.DocNavMobile-select');\nif (readme && readmeContent && readmeOutline && readmeExpand.length && readmeCollapse) {\n  if (readme.clientHeight > 320) {\n    readme?.classList.remove('UnitReadme--expanded');\n    readme?.classList.add('UnitReadme--toggle');\n  }\n  if (window.location.hash.includes('readme')) {\n    expandReadme();\n  }\n  mobileNavSelect?.addEventListener('change', e => {\n    if ((e.target as HTMLSelectElement).value.startsWith('readme-')) {\n      expandReadme();\n    }\n  });\n  readmeExpand.forEach(el =>\n    el.addEventListener('click', e => {\n      e.preventDefault();\n      expandReadme();\n      readme.scrollIntoView();\n    })\n  );\n  readmeCollapse.addEventListener('click', e => {\n    e.preventDefault();\n    readme.classList.remove('UnitReadme--expanded');\n    if (readmeExpand[1]) {\n      readmeExpand[1].scrollIntoView({ block: 'center' });\n    }\n  });\n  readmeContent.addEventListener('keyup', () => {\n    expandReadme();\n  });\n  readmeContent.addEventListener('click', () => {\n    expandReadme();\n  });\n  readmeOutline.addEventListener('click', () => {\n    expandReadme();\n  });\n  document.addEventListener('keydown', e => {\n    if ((e.ctrlKey || e.metaKey) && e.key === 'f') {\n      expandReadme();\n    }\n  });\n}\n\n/**\n * expandReadme expands the readme and adds the section-readme hash to the\n * URL so it stays expanded when navigating back from an external link.\n */\nfunction expandReadme() {\n  history.replaceState(null, '', `${location.pathname}#section-readme`);\n  readme?.classList.add('UnitReadme--expanded');\n}\n\n/**\n * Expand details items that are focused. This will expand\n * deprecated symbols when they are navigated to from the index\n * or a direct link.\n */\nfunction openDeprecatedSymbol() {\n  if (!location.hash) return;\n  const heading = document.getElementById(location.hash.slice(1));\n  const grandParent = heading?.parentElement?.parentElement as HTMLDetailsElement | null;\n  if (grandParent?.nodeName === 'DETAILS') {\n    grandParent.open = true;\n  }\n}\nopenDeprecatedSymbol();\nwindow.addEventListener('hashchange', () => openDeprecatedSymbol());\n\n/**\n * Listen for changes in the build context dropdown.\n */\ndocument.querySelectorAll('.js-buildContextSelect').forEach(el => {\n  el.addEventListener('change', e => {\n    window.location.search = `?GOOS=${(e.target as HTMLSelectElement).value}`;\n  });\n});\n"],
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+  "sourcesContent": ["/*!\n * @license\n * Copyright 2021 The Go Authors. All rights reserved.\n * Use of this source code is governed by a BSD-style\n * license that can be found in the LICENSE file.\n */\n\n// This file implements the playground implementation of the documentation\n// page. The playground involves a \"play\" button that allows you to open up\n// a new link to play.golang.org using the example code.\n\n// The CSS is in static/frontend/unit/main/_doc.css\n\n/**\n * CSS classes used by PlaygroundExampleController\n */\nconst PlayExampleClassName = {\n  PLAY_HREF: '.js-exampleHref',\n  PLAY_CONTAINER: '.js-exampleContainer',\n  EXAMPLE_INPUT: '.Documentation-exampleCode',\n  EXAMPLE_OUTPUT: '.Documentation-exampleOutput',\n  EXAMPLE_ERROR: '.Documentation-exampleError',\n  PLAY_BUTTON: '.Documentation-examplePlayButton',\n  SHARE_BUTTON: '.Documentation-exampleShareButton',\n  FORMAT_BUTTON: '.Documentation-exampleFormatButton',\n  RUN_BUTTON: '.Documentation-exampleRunButton',\n};\n\n/**\n * This controller enables playground examples to expand their dropdown or\n * generate shareable Go Playground URLs.\n */\nexport class PlaygroundExampleController {\n  /**\n   * The anchor tag used to identify the container with an example href.\n   * There is only one in an example container div.\n   */\n  private readonly anchorEl: HTMLAnchorElement | null;\n\n  /**\n   * The error element\n   */\n  private readonly errorEl: Element | null;\n\n  /**\n   * Buttons that redirect to an example's playground, this element\n   * only exists in executable examples.\n   */\n  private readonly playButtonEl: Element | null;\n  private readonly shareButtonEl: Element | null;\n\n  /**\n   * Button that formats the code in an example's playground.\n   */\n  private readonly formatButtonEl: Element | null;\n\n  /**\n   * Button that runs the code in an example's playground, this element\n   * only exists in executable examples.\n   */\n  private readonly runButtonEl: Element | null;\n\n  /**\n   * The executable code of an example.\n   */\n  private readonly inputEl: HTMLTextAreaElement | null;\n\n  /**\n   * The output of the given example code. This only exists if the\n   * author of the package provides an output for this example.\n   */\n  private readonly outputEl: Element | null;\n\n  /**\n   * @param exampleEl The div that contains playground content for the given example.\n   */\n  constructor(private readonly exampleEl: HTMLDetailsElement) {\n    this.exampleEl = exampleEl;\n    this.anchorEl = exampleEl.querySelector('a');\n    this.errorEl = exampleEl.querySelector(PlayExampleClassName.EXAMPLE_ERROR);\n    this.playButtonEl = exampleEl.querySelector(PlayExampleClassName.PLAY_BUTTON);\n    this.shareButtonEl = exampleEl.querySelector(PlayExampleClassName.SHARE_BUTTON);\n    this.formatButtonEl = exampleEl.querySelector(PlayExampleClassName.FORMAT_BUTTON);\n    this.runButtonEl = exampleEl.querySelector(PlayExampleClassName.RUN_BUTTON);\n    this.inputEl = this.makeTextArea(exampleEl.querySelector(PlayExampleClassName.EXAMPLE_INPUT));\n    this.outputEl = exampleEl.querySelector(PlayExampleClassName.EXAMPLE_OUTPUT);\n\n    // This is legacy listener to be replaced the listener for shareButtonEl.\n    this.playButtonEl?.addEventListener('click', () => this.handleShareButtonClick());\n    this.shareButtonEl?.addEventListener('click', () => this.handleShareButtonClick());\n    this.formatButtonEl?.addEventListener('click', () => this.handleFormatButtonClick());\n    this.runButtonEl?.addEventListener('click', () => this.handleRunButtonClick());\n\n    if (!this.inputEl) return;\n\n    this.resize();\n    this.inputEl.addEventListener('keyup', () => this.resize());\n    this.inputEl.addEventListener('keydown', e => this.onKeydown(e));\n  }\n\n  /**\n   * Replace the pre element with a textarea. The examples are initially rendered\n   * as pre elements so they're fully visible when JS is disabled.\n   */\n  makeTextArea(el: Element | null): HTMLTextAreaElement {\n    const t = document.createElement('textarea');\n    t.classList.add('Documentation-exampleCode', 'code');\n    t.spellcheck = false;\n    t.value = el?.textContent ?? '';\n    el?.parentElement?.replaceChild(t, el);\n    return t;\n  }\n\n  /**\n   * Retrieve the hash value of the anchor element.\n   */\n  getAnchorHash(): string | undefined {\n    return this.anchorEl?.hash;\n  }\n\n  /**\n   * Expands the current playground example.\n   */\n  expand(): void {\n    this.exampleEl.open = true;\n  }\n\n  /**\n   * Resizes the input element to accommodate the amount of text present.\n   */\n  private resize(): void {\n    if (this.inputEl?.value) {\n      const numLineBreaks = (this.inputEl.value.match(/\\n/g) || []).length;\n      // min-height + lines x line-height + padding + border\n      this.inputEl.style.height = `${(20 + numLineBreaks * 20 + 12 + 2) / 16}rem`;\n    }\n  }\n\n  /**\n   * Handler to override keyboard behavior in the playground's\n   * textarea element.\n   *\n   * Tab key inserts tabs into the example playground instead of\n   * switching to the next interactive element.\n   * @param e input element keyboard event.\n   */\n  private onKeydown(e: KeyboardEvent) {\n    if (e.key === 'Tab') {\n      document.execCommand('insertText', false, '\\t');\n      e.preventDefault();\n    }\n  }\n\n  /**\n   * Changes the text of the example's input box.\n   */\n  private setInputText(output: string) {\n    if (this.inputEl) {\n      this.inputEl.value = output;\n    }\n  }\n\n  /**\n   * Changes the text of the example's output box.\n   */\n  private setOutputText(output: string) {\n    if (this.outputEl) {\n      this.outputEl.textContent = output;\n    }\n  }\n\n  private setOutputHTML(output: string) {\n    if (this.outputEl) {\n      this.outputEl.innerHTML = output;\n    }\n  }\n\n  /**\n   * Sets the error message text and overwrites\n   * output box to indicate a failed response.\n   */\n  private setErrorText(err: string) {\n    if (this.errorEl) {\n      this.errorEl.textContent = err;\n    }\n    this.setOutputText('An error has occurred\u2026');\n  }\n\n  /**\n   * Opens a new window to play.golang.org using the\n   * example snippet's code in the playground.\n   */\n  private handleShareButtonClick() {\n    const PLAYGROUND_BASE_URL = 'https://play.golang.org/p/';\n\n    this.setOutputText('Waiting for remote server\u2026');\n\n    fetch('/play/share', {\n      method: 'POST',\n      body: this.inputEl?.value,\n    })\n      .then(res => res.text())\n      .then(shareId => {\n        const href = PLAYGROUND_BASE_URL + shareId;\n        this.setOutputHTML(`<a href=\"${href}\">${href}</a>`);\n        window.open(href);\n      })\n      .catch(err => {\n        this.setErrorText(err);\n      });\n  }\n\n  /**\n   * Runs gofmt on the example snippet in the playground.\n   */\n  private handleFormatButtonClick() {\n    this.setOutputText('Waiting for remote server\u2026');\n    const body = new FormData();\n    body.append('body', this.inputEl?.value ?? '');\n\n    fetch('/play/fmt', {\n      method: 'POST',\n      body: body,\n    })\n      .then(res => res.json())\n      .then(({ Body, Error }) => {\n        this.setOutputText(Error || 'Done.');\n        if (Body) {\n          this.setInputText(Body);\n          this.resize();\n        }\n      })\n      .catch(err => {\n        this.setErrorText(err);\n      });\n  }\n\n  /**\n   * Runs the code snippet in the example playground.\n   */\n  private handleRunButtonClick() {\n    this.setOutputText('Waiting for remote server\u2026');\n\n    let codeWithModFile = this.inputEl?.value ?? '';\n    const moduleVars = document.querySelector<HTMLDivElement>('.js-playgroundVars')?.dataset ?? {};\n    console.log(moduleVars.unitpath);\n    if (moduleVars.pagetype !== 'std') {\n      codeWithModFile = codeWithModFile.concat(`\n-- go.mod --\nmodule play.ground\n\nrequire ${moduleVars.unitpath} ${moduleVars.version}\n`);\n    }\n    fetch('/play/compile', {\n      method: 'POST',\n      body: JSON.stringify({ body: codeWithModFile, version: 2 }),\n    })\n      .then(res => res.json())\n      .then(async ({ Events, Errors }) => {\n        this.setOutputText(Errors || '');\n        for (const e of Events || []) {\n          this.setOutputText(e.Message);\n          await new Promise(resolve => setTimeout(resolve, e.Delay / 1000000));\n        }\n      })\n      .catch(err => {\n        this.setErrorText(err);\n      });\n  }\n}\n\nexport function initPlaygrounds(): void {\n  const exampleHashRegex = location.hash.match(/^#(example-.*)$/);\n  if (exampleHashRegex) {\n    const exampleHashEl = document.getElementById(exampleHashRegex[1]) as HTMLDetailsElement;\n    if (exampleHashEl) {\n      exampleHashEl.open = true;\n    }\n  }\n\n  // We use a spread operator to convert a nodelist into an array of elements.\n  const exampleHrefs = [\n    ...document.querySelectorAll<HTMLAnchorElement>(PlayExampleClassName.PLAY_HREF),\n  ];\n\n  /**\n   * Sometimes exampleHrefs and playContainers are in different order, so we\n   * find an exampleHref from a common hash.\n   * @param playContainer - playground container\n   */\n  const findExampleHash = (playContainer: PlaygroundExampleController) =>\n    exampleHrefs.find(ex => {\n      return ex.hash === playContainer.getAnchorHash();\n    });\n\n  for (const el of document.querySelectorAll(PlayExampleClassName.PLAY_CONTAINER)) {\n    // There should be the same amount of hrefs referencing examples as example containers.\n    const playContainer = new PlaygroundExampleController(el as HTMLDetailsElement);\n    const exampleHref = findExampleHash(playContainer);\n    if (exampleHref) {\n      exampleHref.addEventListener('click', () => {\n        playContainer.expand();\n      });\n    } else {\n      console.warn('example href not found');\n    }\n  }\n}\n", "/**\n * @license\n * Copyright 2021 The Go Authors. All rights reserved.\n * Use of this source code is governed by a BSD-style\n * license that can be found in the LICENSE file.\n */\n\nimport { TreeNavController } from './tree.js';\n\nexport class SelectNavController {\n  constructor(private el: Element) {\n    this.el.addEventListener('change', e => {\n      const target = e.target as HTMLSelectElement;\n      let href = target.value;\n      if (!target.value.startsWith('/')) {\n        href = '/' + href;\n      }\n      window.location.href = href;\n    });\n  }\n}\n\nexport function makeSelectNav(tree: TreeNavController): HTMLLabelElement {\n  const label = document.createElement('label');\n  label.classList.add('go-Label');\n  label.setAttribute('aria-label', 'Menu');\n  const select = document.createElement('select');\n  select.classList.add('go-Select', 'js-selectNav');\n  label.appendChild(select);\n  const outline = document.createElement('optgroup');\n  outline.label = 'Outline';\n  select.appendChild(outline);\n  const groupMap: Record<string, HTMLOptGroupElement> = {};\n  let group: HTMLOptGroupElement;\n  for (const t of tree.treeitems) {\n    if (Number(t.depth) > 4) continue;\n    if (t.groupTreeitem) {\n      group = groupMap[t.groupTreeitem.label];\n      if (!group) {\n        group = groupMap[t.groupTreeitem.label] = document.createElement('optgroup');\n        group.label = t.groupTreeitem.label;\n        select.appendChild(group);\n      }\n    } else {\n      group = outline;\n    }\n    const o = document.createElement('option');\n    o.label = t.label;\n    o.textContent = t.label;\n    o.value = (t.el as HTMLAnchorElement).href.replace(window.location.origin, '').replace('/', '');\n    group.appendChild(o);\n  }\n  tree.addObserver(t => {\n    const hash = (t.el as HTMLAnchorElement).hash;\n    const value = select.querySelector<HTMLOptionElement>(`[value$=\"${hash}\"]`)?.value;\n    if (value) {\n      select.value = value;\n    }\n  }, 50);\n  return label;\n}\n", "/**\n * @license\n * Copyright 2021 The Go Authors. All rights reserved.\n * Use of this source code is governed by a BSD-style\n * license that can be found in the LICENSE file.\n */\n\n/**\n * TreeNavController is the navigation tree component of the documentation page.\n * It adds accessiblity attributes to a tree, observes the heading elements\n * focus the topmost link for headings visible on the page, and implements the\n * WAI-ARIA Treeview Design Pattern with full\n * [keyboard support](https://www.w3.org/TR/wai-aria-practices/examples/treeview/treeview-2/treeview-2a.html#kbd_label).\n */\nexport class TreeNavController {\n  treeitems: TreeItem[];\n\n  /**\n   * firstChars is the first character of each treeitem in the same order\n   * as this.treeitems. We use this array to set focus by character when\n   * navigating the tree with a keyboard.\n   */\n  private firstChars: string[];\n  private firstTreeitem: TreeItem | null;\n  private lastTreeitem: TreeItem | null;\n  private observerCallbacks: ((t: TreeItem) => void)[];\n\n  constructor(private el: HTMLElement) {\n    this.treeitems = [];\n    this.firstChars = [];\n    this.firstTreeitem = null;\n    this.lastTreeitem = null;\n    this.observerCallbacks = [];\n    this.init();\n  }\n\n  private init(): void {\n    this.handleResize();\n    window.addEventListener('resize', this.handleResize);\n    this.findTreeItems();\n    this.updateVisibleTreeitems();\n    this.observeTargets();\n    if (this.firstTreeitem) {\n      this.firstTreeitem.el.tabIndex = 0;\n    }\n  }\n\n  private handleResize = (): void => {\n    this.el.style.setProperty('--js-tree-height', '100vh');\n    this.el.style.setProperty('--js-tree-height', this.el.clientHeight + 'px');\n  };\n\n  private observeTargets() {\n    this.addObserver(treeitem => {\n      this.expandTreeitem(treeitem);\n      this.setSelected(treeitem);\n      // TODO: Fix scroll issue in https://golang.org/issue/47450.\n      // treeitem.el.scrollIntoView({ block: 'nearest' });\n    });\n\n    const targets = new Map<string, boolean>();\n    const observer = new IntersectionObserver(\n      entries => {\n        for (const entry of entries) {\n          targets.set(entry.target.id, entry.isIntersecting || entry.intersectionRatio === 1);\n        }\n        for (const [id, isIntersecting] of targets) {\n          if (isIntersecting) {\n            const active = this.treeitems.find(t =>\n              (t.el as HTMLAnchorElement)?.href.endsWith(`#${id}`)\n            );\n            if (active) {\n              for (const fn of this.observerCallbacks) {\n                fn(active);\n              }\n            }\n            break;\n          }\n        }\n      },\n      {\n        threshold: 1.0,\n        rootMargin: '-60px 0px 0px 0px',\n      }\n    );\n\n    for (const href of this.treeitems.map(t => t.el.getAttribute('href'))) {\n      if (href) {\n        const id = href.replace(window.location.origin, '').replace('/', '').replace('#', '');\n        const target = document.getElementById(id);\n        if (target) {\n          observer.observe(target);\n        }\n      }\n    }\n  }\n\n  addObserver(fn: (t: TreeItem) => void, delay = 200): void {\n    this.observerCallbacks.push(debounce(fn, delay));\n  }\n\n  setFocusToNextItem(currentItem: TreeItem): void {\n    let nextItem = null;\n    for (let i = currentItem.index + 1; i < this.treeitems.length; i++) {\n      const ti = this.treeitems[i];\n      if (ti.isVisible) {\n        nextItem = ti;\n        break;\n      }\n    }\n    if (nextItem) {\n      this.setFocusToItem(nextItem);\n    }\n  }\n\n  setFocusToPreviousItem(currentItem: TreeItem): void {\n    let prevItem = null;\n    for (let i = currentItem.index - 1; i > -1; i--) {\n      const ti = this.treeitems[i];\n      if (ti.isVisible) {\n        prevItem = ti;\n        break;\n      }\n    }\n    if (prevItem) {\n      this.setFocusToItem(prevItem);\n    }\n  }\n\n  setFocusToParentItem(currentItem: TreeItem): void {\n    if (currentItem.groupTreeitem) {\n      this.setFocusToItem(currentItem.groupTreeitem);\n    }\n  }\n\n  setFocusToFirstItem(): void {\n    this.firstTreeitem && this.setFocusToItem(this.firstTreeitem);\n  }\n\n  setFocusToLastItem(): void {\n    this.lastTreeitem && this.setFocusToItem(this.lastTreeitem);\n  }\n\n  setSelected(currentItem: TreeItem): void {\n    for (const l1 of this.el.querySelectorAll('[aria-expanded=\"true\"]')) {\n      if (l1 === currentItem.el) continue;\n      if (!l1.nextElementSibling?.contains(currentItem.el)) {\n        l1.setAttribute('aria-expanded', 'false');\n      }\n    }\n    for (const l1 of this.el.querySelectorAll('[aria-selected]')) {\n      if (l1 !== currentItem.el) {\n        l1.setAttribute('aria-selected', 'false');\n      }\n    }\n    currentItem.el.setAttribute('aria-selected', 'true');\n    this.updateVisibleTreeitems();\n    this.setFocusToItem(currentItem, false);\n  }\n\n  expandTreeitem(treeitem: TreeItem): void {\n    let currentItem: TreeItem | null = treeitem;\n    while (currentItem) {\n      if (currentItem.isExpandable) {\n        currentItem.el.setAttribute('aria-expanded', 'true');\n      }\n      currentItem = currentItem.groupTreeitem;\n    }\n    this.updateVisibleTreeitems();\n  }\n\n  expandAllSiblingItems(currentItem: TreeItem): void {\n    for (const ti of this.treeitems) {\n      if (ti.groupTreeitem === currentItem.groupTreeitem && ti.isExpandable) {\n        this.expandTreeitem(ti);\n      }\n    }\n  }\n\n  collapseTreeitem(currentItem: TreeItem): void {\n    let groupTreeitem = null;\n\n    if (currentItem.isExpanded()) {\n      groupTreeitem = currentItem;\n    } else {\n      groupTreeitem = currentItem.groupTreeitem;\n    }\n\n    if (groupTreeitem) {\n      groupTreeitem.el.setAttribute('aria-expanded', 'false');\n      this.updateVisibleTreeitems();\n      this.setFocusToItem(groupTreeitem);\n    }\n  }\n\n  setFocusByFirstCharacter(currentItem: TreeItem, char: string): void {\n    let start: number, index: number;\n    char = char.toLowerCase();\n\n    // Get start index for search based on position of currentItem\n    start = currentItem.index + 1;\n    if (start === this.treeitems.length) {\n      start = 0;\n    }\n\n    // Check remaining slots in the menu\n    index = this.getIndexFirstChars(start, char);\n\n    // If not found in remaining slots, check from beginning\n    if (index === -1) {\n      index = this.getIndexFirstChars(0, char);\n    }\n\n    // If match was found...\n    if (index > -1) {\n      this.setFocusToItem(this.treeitems[index]);\n    }\n  }\n\n  private findTreeItems() {\n    const findItems = (el: HTMLElement, group: TreeItem | null) => {\n      let ti = group;\n      let curr = el.firstElementChild as HTMLElement;\n      while (curr) {\n        if (curr.tagName === 'A' || curr.tagName === 'SPAN') {\n          ti = new TreeItem(curr, this, group);\n          this.treeitems.push(ti);\n          this.firstChars.push(ti.label.substring(0, 1).toLowerCase());\n        }\n        if (curr.firstElementChild) {\n          findItems(curr, ti);\n        }\n        curr = curr.nextElementSibling as HTMLElement;\n      }\n    };\n    findItems(this.el as HTMLElement, null);\n    this.treeitems.map((ti, idx) => (ti.index = idx));\n  }\n\n  private updateVisibleTreeitems(): void {\n    this.firstTreeitem = this.treeitems[0];\n\n    for (const ti of this.treeitems) {\n      let parent = ti.groupTreeitem;\n      ti.isVisible = true;\n      while (parent && parent.el !== this.el) {\n        if (!parent.isExpanded()) {\n          ti.isVisible = false;\n        }\n        parent = parent.groupTreeitem;\n      }\n      if (ti.isVisible) {\n        this.lastTreeitem = ti;\n      }\n    }\n  }\n\n  private setFocusToItem(treeitem: TreeItem, focusEl = true) {\n    treeitem.el.tabIndex = 0;\n    if (focusEl) {\n      treeitem.el.focus();\n    }\n    for (const ti of this.treeitems) {\n      if (ti !== treeitem) {\n        ti.el.tabIndex = -1;\n      }\n    }\n  }\n\n  private getIndexFirstChars(startIndex: number, char: string): number {\n    for (let i = startIndex; i < this.firstChars.length; i++) {\n      if (this.treeitems[i].isVisible && char === this.firstChars[i]) {\n        return i;\n      }\n    }\n    return -1;\n  }\n}\n\nclass TreeItem {\n  el: HTMLElement;\n  groupTreeitem: TreeItem | null;\n  label: string;\n  isExpandable: boolean;\n  isVisible: boolean;\n  depth: number;\n  index: number;\n\n  private tree: TreeNavController;\n  private isInGroup: boolean;\n\n  constructor(el: HTMLElement, treeObj: TreeNavController, group: TreeItem | null) {\n    el.tabIndex = -1;\n    this.el = el;\n    this.groupTreeitem = group;\n    this.label = el.textContent?.trim() ?? '';\n    this.tree = treeObj;\n    this.depth = (group?.depth || 0) + 1;\n    this.index = 0;\n\n    const parent = el.parentElement;\n    if (parent?.tagName.toLowerCase() === 'li') {\n      parent?.setAttribute('role', 'none');\n    }\n    el.setAttribute('aria-level', this.depth + '');\n    if (el.getAttribute('aria-label')) {\n      this.label = el?.getAttribute('aria-label')?.trim() ?? '';\n    }\n\n    this.isExpandable = false;\n    this.isVisible = false;\n    this.isInGroup = !!group;\n\n    let curr = el.nextElementSibling;\n    while (curr) {\n      if (curr.tagName.toLowerCase() == 'ul') {\n        const groupId = `${group?.label ?? ''} nav group ${this.label}`.replace(/[\\W_]+/g, '_');\n        el.setAttribute('aria-owns', groupId);\n        el.setAttribute('aria-expanded', 'false');\n        curr.setAttribute('role', 'group');\n        curr.setAttribute('id', groupId);\n        this.isExpandable = true;\n        break;\n      }\n\n      curr = curr.nextElementSibling;\n    }\n    this.init();\n  }\n\n  private init() {\n    this.el.tabIndex = -1;\n    if (!this.el.getAttribute('role')) {\n      this.el.setAttribute('role', 'treeitem');\n    }\n    this.el.addEventListener('keydown', this.handleKeydown.bind(this));\n    this.el.addEventListener('click', this.handleClick.bind(this));\n    this.el.addEventListener('focus', this.handleFocus.bind(this));\n    this.el.addEventListener('blur', this.handleBlur.bind(this));\n  }\n\n  isExpanded() {\n    if (this.isExpandable) {\n      return this.el.getAttribute('aria-expanded') === 'true';\n    }\n\n    return false;\n  }\n\n  isSelected() {\n    return this.el.getAttribute('aria-selected') === 'true';\n  }\n\n  private handleClick(event: MouseEvent) {\n    // only process click events that directly happened on this treeitem\n    if (event.target !== this.el && event.target !== this.el.firstElementChild) {\n      return;\n    }\n    if (this.isExpandable) {\n      if (this.isExpanded() && this.isSelected()) {\n        this.tree.collapseTreeitem(this);\n      } else {\n        this.tree.expandTreeitem(this);\n      }\n      event.stopPropagation();\n    }\n    this.tree.setSelected(this);\n  }\n\n  private handleFocus() {\n    let el = this.el;\n    if (this.isExpandable) {\n      el = (el.firstElementChild as HTMLElement) ?? el;\n    }\n    el.classList.add('focus');\n  }\n\n  private handleBlur() {\n    let el = this.el;\n    if (this.isExpandable) {\n      el = (el.firstElementChild as HTMLElement) ?? el;\n    }\n    el.classList.remove('focus');\n  }\n\n  private handleKeydown(event: KeyboardEvent) {\n    if (event.altKey || event.ctrlKey || event.metaKey) {\n      return;\n    }\n\n    let captured = false;\n    switch (event.key) {\n      case ' ':\n      case 'Enter':\n        if (this.isExpandable) {\n          if (this.isExpanded() && this.isSelected()) {\n            this.tree.collapseTreeitem(this);\n          } else {\n            this.tree.expandTreeitem(this);\n          }\n          captured = true;\n        } else {\n          event.stopPropagation();\n        }\n        this.tree.setSelected(this);\n        break;\n\n      case 'ArrowUp':\n        this.tree.setFocusToPreviousItem(this);\n        captured = true;\n        break;\n\n      case 'ArrowDown':\n        this.tree.setFocusToNextItem(this);\n        captured = true;\n        break;\n\n      case 'ArrowRight':\n        if (this.isExpandable) {\n          if (this.isExpanded()) {\n            this.tree.setFocusToNextItem(this);\n          } else {\n            this.tree.expandTreeitem(this);\n          }\n        }\n        captured = true;\n        break;\n\n      case 'ArrowLeft':\n        if (this.isExpandable && this.isExpanded()) {\n          this.tree.collapseTreeitem(this);\n          captured = true;\n        } else {\n          if (this.isInGroup) {\n            this.tree.setFocusToParentItem(this);\n            captured = true;\n          }\n        }\n        break;\n\n      case 'Home':\n        this.tree.setFocusToFirstItem();\n        captured = true;\n        break;\n\n      case 'End':\n        this.tree.setFocusToLastItem();\n        captured = true;\n        break;\n\n      default:\n        if (event.key.length === 1 && event.key.match(/\\S/)) {\n          if (event.key == '*') {\n            this.tree.expandAllSiblingItems(this);\n          } else {\n            this.tree.setFocusByFirstCharacter(this, event.key);\n          }\n          captured = true;\n        }\n        break;\n    }\n\n    if (captured) {\n      event.stopPropagation();\n      event.preventDefault();\n    }\n  }\n}\n\n// eslint-disable-next-line @typescript-eslint/no-explicit-any\nfunction debounce<T extends (...args: any[]) => any>(func: T, wait: number) {\n  let timeout: ReturnType<typeof setTimeout> | null;\n  return (...args: Parameters<T>) => {\n    const later = () => {\n      timeout = null;\n      func(...args);\n    };\n    if (timeout) {\n      clearTimeout(timeout);\n    }\n    timeout = setTimeout(later, wait);\n  };\n}\n", "/*!\n * @license\n * Copyright 2020 The Go Authors. All rights reserved.\n * Use of this source code is governed by a BSD-style\n * license that can be found in the LICENSE file.\n */\n\n/**\n * Controller for a table element with expandable rows. Adds event listeners to\n * a toggle within a table row that controls visiblity of additional related\n * rows in the table.\n *\n * @example\n * ```typescript\n * import {ExpandableRowsTableController} from '/static/js/table';\n *\n * const el = document .querySelector<HTMLTableElement>('.js-myTableElement')\n * new ExpandableRowsTableController(el));\n * ```\n */\nexport class ExpandableRowsTableController {\n  private rows: HTMLTableRowElement[];\n  private toggles: HTMLButtonElement[];\n\n  /**\n   * Create a table controller.\n   * @param table - The table element to which the controller binds.\n   */\n  constructor(private table: HTMLTableElement, private toggleAll?: HTMLButtonElement | null) {\n    this.rows = Array.from(table.querySelectorAll<HTMLTableRowElement>('[data-aria-controls]'));\n    this.toggles = Array.from(this.table.querySelectorAll('[aria-expanded]'));\n    this.setAttributes();\n    this.attachEventListeners();\n    this.update();\n  }\n\n  /**\n   * setAttributes sets data-aria-* and data-id attributes to regular\n   * html attributes as a workaround for limitations from safehtml.\n   */\n  private setAttributes() {\n    for (const a of ['data-aria-controls', 'data-aria-labelledby', 'data-id']) {\n      this.table.querySelectorAll(`[${a}]`).forEach(t => {\n        t.setAttribute(a.replace('data-', ''), t.getAttribute(a) ?? '');\n        t.removeAttribute(a);\n      });\n    }\n  }\n\n  private attachEventListeners() {\n    this.rows.forEach(t => {\n      t.addEventListener('click', e => {\n        this.handleToggleClick(e);\n      });\n    });\n    this.toggleAll?.addEventListener('click', () => {\n      this.expandAllItems();\n    });\n\n    document.addEventListener('keydown', e => {\n      if ((e.ctrlKey || e.metaKey) && e.key === 'f') {\n        this.expandAllItems();\n      }\n    });\n  }\n\n  private handleToggleClick(e: MouseEvent) {\n    let target = e.currentTarget as HTMLTableRowElement | null;\n    if (!target?.hasAttribute('aria-expanded')) {\n      target = this.table.querySelector(\n        `button[aria-controls=\"${target?.getAttribute('aria-controls')}\"]`\n      );\n    }\n    const isExpanded = target?.getAttribute('aria-expanded') === 'true';\n    target?.setAttribute('aria-expanded', isExpanded ? 'false' : 'true');\n    e.stopPropagation();\n    this.update();\n  }\n\n  expandAllItems = (): void => {\n    this.toggles.map(t => t.setAttribute('aria-expanded', 'true'));\n    this.update();\n  };\n\n  private collapseAllItems = () => {\n    this.toggles.map(t => t.setAttribute('aria-expanded', 'false'));\n    this.update();\n  };\n\n  private update = () => {\n    this.updateVisibleItems();\n    setTimeout(() => this.updateGlobalToggle());\n  };\n\n  private updateVisibleItems() {\n    this.rows.map(t => {\n      const isExpanded = t?.getAttribute('aria-expanded') === 'true';\n      const rowIds = t?.getAttribute('aria-controls')?.trimEnd().split(' ');\n      rowIds?.map(id => {\n        const target = document.getElementById(`${id}`);\n        if (isExpanded) {\n          target?.classList.add('visible');\n          target?.classList.remove('hidden');\n        } else {\n          target?.classList.add('hidden');\n          target?.classList.remove('visible');\n        }\n      });\n    });\n  }\n\n  private updateGlobalToggle() {\n    if (!this.toggleAll) return;\n    if (this.rows.some(t => t.hasAttribute('aria-expanded'))) {\n      this.toggleAll.style.display = 'block';\n    }\n    const someCollapsed = this.toggles.some(el => el.getAttribute('aria-expanded') === 'false');\n    if (someCollapsed) {\n      this.toggleAll.innerText = 'Expand all';\n      this.toggleAll.onclick = this.expandAllItems;\n    } else {\n      this.toggleAll.innerText = 'Collapse all';\n      this.toggleAll.onclick = this.collapseAllItems;\n    }\n  }\n}\n", "import { initPlaygrounds } from 'static/shared/playground/playground';\nimport { SelectNavController, makeSelectNav } from 'static/shared/outline/select';\nimport { TreeNavController } from 'static/shared/outline/tree';\nimport { ExpandableRowsTableController } from 'static/shared/table/table';\n\ninitPlaygrounds();\n\nconst directories = document.querySelector<HTMLTableElement>('.js-expandableTable');\nif (directories) {\n  const table = new ExpandableRowsTableController(\n    directories,\n    document.querySelector<HTMLButtonElement>('.js-expandAllDirectories')\n  );\n  // Expand directories on page load with expand-directories query param.\n  if (window.location.search.includes('expand-directories')) {\n    table.expandAllItems();\n  }\n}\n\nconst treeEl = document.querySelector<HTMLElement>('.js-tree');\nif (treeEl) {\n  const treeCtrl = new TreeNavController(treeEl);\n  const select = makeSelectNav(treeCtrl);\n  const mobileNav = document.querySelector('.js-mainNavMobile');\n  if (mobileNav && mobileNav.firstElementChild) {\n    mobileNav?.replaceChild(select, mobileNav.firstElementChild);\n  }\n  if (select.firstElementChild) {\n    new SelectNavController(select.firstElementChild);\n  }\n}\n\n/**\n * Event handlers for expanding and collapsing the readme section.\n */\nconst readme = document.querySelector('.js-readme');\nconst readmeContent = document.querySelector('.js-readmeContent');\nconst readmeOutline = document.querySelector('.js-readmeOutline');\nconst readmeExpand = document.querySelectorAll('.js-readmeExpand');\nconst readmeCollapse = document.querySelector('.js-readmeCollapse');\nconst mobileNavSelect = document.querySelector<HTMLSelectElement>('.DocNavMobile-select');\nif (readme && readmeContent && readmeOutline && readmeExpand.length && readmeCollapse) {\n  if (readme.clientHeight > 320) {\n    readme?.classList.remove('UnitReadme--expanded');\n    readme?.classList.add('UnitReadme--toggle');\n  }\n  if (window.location.hash.includes('readme')) {\n    expandReadme();\n  }\n  mobileNavSelect?.addEventListener('change', e => {\n    if ((e.target as HTMLSelectElement).value.startsWith('readme-')) {\n      expandReadme();\n    }\n  });\n  readmeExpand.forEach(el =>\n    el.addEventListener('click', e => {\n      e.preventDefault();\n      expandReadme();\n      readme.scrollIntoView();\n    })\n  );\n  readmeCollapse.addEventListener('click', e => {\n    e.preventDefault();\n    readme.classList.remove('UnitReadme--expanded');\n    if (readmeExpand[1]) {\n      readmeExpand[1].scrollIntoView({ block: 'center' });\n    }\n  });\n  readmeContent.addEventListener('keyup', () => {\n    expandReadme();\n  });\n  readmeContent.addEventListener('click', () => {\n    expandReadme();\n  });\n  readmeOutline.addEventListener('click', () => {\n    expandReadme();\n  });\n  document.addEventListener('keydown', e => {\n    if ((e.ctrlKey || e.metaKey) && e.key === 'f') {\n      expandReadme();\n    }\n  });\n}\n\n/**\n * expandReadme expands the readme and adds the section-readme hash to the\n * URL so it stays expanded when navigating back from an external link.\n */\nfunction expandReadme() {\n  history.replaceState(null, '', `${location.pathname}#section-readme`);\n  readme?.classList.add('UnitReadme--expanded');\n}\n\n/**\n * Expand details items that are focused. 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   "names": []
 }
diff --git a/static/frontend/unit/main/main.tmpl b/static/frontend/unit/main/main.tmpl
index 6493905..dbf87a2 100644
--- a/static/frontend/unit/main/main.tmpl
+++ b/static/frontend/unit/main/main.tmpl
@@ -78,6 +78,7 @@
 
 {{define "main-scripts"}}
   <div class="js-canonicalURLPath" data-canonical-url-path="{{.CanonicalURLPath}}" hidden></div>
+  <div class="js-playgroundVars" data-modulepath="{{.Unit.ModulePath}}" data-version="{{.Unit.Version}}" hidden></div>
   <script>
     loadScript('/static/frontend/unit/main/main.js')
   </script>
diff --git a/static/shared/playground/playground.test.ts b/static/shared/playground/playground.test.ts
index 02a468b..60ca821 100644
--- a/static/shared/playground/playground.test.ts
+++ b/static/shared/playground/playground.test.ts
@@ -39,30 +39,39 @@
 
 describe('PlaygroundExampleController', () => {
   let example: HTMLDetailsElement;
+  const snippetWithModeFile = codeSnippet.concat(`
+-- go.mod --
+module play.ground
+
+require example v1
+`);
+  const htmlEl = `
+  <details tabindex="-1" id="example-Sprintln" class="Documentation-exampleDetails js-exampleContainer">
+  <summary class="Documentation-exampleDetailsHeader">Example <a href="#example-Sprintln">¶</a></summary>
+  <div class="Documentation-exampleDetailsBody">
+  <p>Code:</p>
+
+  <pre class="Documentation-exampleCode">${escapeHTML(codeSnippet)}</pre>
+
+  <pre>
+    <span class="Documentation-exampleOutputLabel">Output:</span>
+    <span class="Documentation-exampleOutput">Kim is 22 years old.</span>
+  </pre>
+  </div>
+  <div class="Documentation-exampleButtonsContainer">
+    <p class="Documentation-exampleError" role="alert" aria-atomic="true"></p>
+    <button class="Documentation-exampleShareButton" aria-label="Share Code">Share</button>
+    <button class="Documentation-exampleFormatButton" aria-label="Format Code">Format</button>
+    <button class="Documentation-exampleRunButton" aria-label="Run Code">Run</button>
+  </div></details>
+`;
   window.fetch = jest.fn();
   window.open = jest.fn();
 
   beforeEach(() => {
-    document.body.innerHTML = `
-      <details tabindex="-1" id="example-Sprintln" class="Documentation-exampleDetails js-exampleContainer">
-      <summary class="Documentation-exampleDetailsHeader">Example <a href="#example-Sprintln">¶</a></summary>
-      <div class="Documentation-exampleDetailsBody">
-      <p>Code:</p>
-
-      <pre class="Documentation-exampleCode">${escapeHTML(codeSnippet)}</pre>
-
-      <pre>
-        <span class="Documentation-exampleOutputLabel">Output:</span>
-        <span class="Documentation-exampleOutput">Kim is 22 years old.</span>
-      </pre>
-      </div>
-      <div class="Documentation-exampleButtonsContainer">
-        <p class="Documentation-exampleError" role="alert" aria-atomic="true"></p>
-        <button class="Documentation-exampleShareButton" aria-label="Share Code">Share</button>
-        <button class="Documentation-exampleFormatButton" aria-label="Format Code">Format</button>
-        <button class="Documentation-exampleRunButton" aria-label="Run Code">Run</button>
-      </div></details>
-    `;
+    document.body.innerHTML = htmlEl.concat(`
+    <div class="js-playgroundVars" data-modulepath="example" data-version="v1" hidden></div>
+`);
     example = el('.js-exampleContainer') as HTMLDetailsElement;
     new PlaygroundExampleController(example);
   });
@@ -153,7 +162,7 @@
     await flushPromises();
 
     expect(window.fetch).toHaveBeenCalledWith('/play/compile', {
-      body: JSON.stringify({ body: codeSnippet, version: 2 }),
+      body: JSON.stringify({ body: snippetWithModeFile, version: 2 }),
       method: 'POST',
     });
     expect(el('.Documentation-exampleOutput').textContent).toContain('// mocked response');
@@ -171,7 +180,7 @@
     await flushPromises();
 
     expect(window.fetch).toHaveBeenCalledWith('/play/compile', {
-      body: JSON.stringify({ body: codeSnippet, version: 2 }),
+      body: JSON.stringify({ body: snippetWithModeFile, version: 2 }),
       method: 'POST',
     });
     expect(el('.Documentation-exampleOutput').textContent).toContain('// mocked error');
@@ -189,6 +198,30 @@
     await flushPromises();
 
     expect(window.fetch).toHaveBeenCalledWith('/play/compile', {
+      body: JSON.stringify({ body: snippetWithModeFile, version: 2 }),
+      method: 'POST',
+    });
+    expect(el('.Documentation-exampleOutput').innerHTML).toBe('&lt;input required&gt;');
+  });
+
+  it('snippet without mod file for standard package', async () => {
+    document.body.innerHTML = htmlEl.concat(`
+    <div class="js-playgroundVars" data-modulepath="std" data-version="v1" hidden></div>
+`);
+    example = el('.js-exampleContainer') as HTMLDetailsElement;
+    new PlaygroundExampleController(example);
+
+    mocked(window.fetch).mockResolvedValue({
+      json: () =>
+        Promise.resolve({
+          Events: [{ Message: '\u003cinput required\u003e', Kind: 'stdout', Delay: 0 }],
+          Errors: null,
+        }),
+    } as Response);
+    el('[aria-label="Run Code"]').click();
+    await flushPromises();
+
+    expect(window.fetch).toHaveBeenCalledWith('/play/compile', {
       body: JSON.stringify({ body: codeSnippet, version: 2 }),
       method: 'POST',
     });
diff --git a/static/shared/playground/playground.ts b/static/shared/playground/playground.ts
index a24a27f..ad3156d 100644
--- a/static/shared/playground/playground.ts
+++ b/static/shared/playground/playground.ts
@@ -241,9 +241,19 @@
   private handleRunButtonClick() {
     this.setOutputText('Waiting for remote server…');
 
+    let codeWithModFile = this.inputEl?.value ?? '';
+    const moduleVars = document.querySelector<HTMLDivElement>('.js-playgroundVars')?.dataset ?? {};
+    if (moduleVars.modulepath !== 'std') {
+      codeWithModFile = codeWithModFile.concat(`
+-- go.mod --
+module play.ground
+
+require ${moduleVars.modulepath} ${moduleVars.version}
+`);
+    }
     fetch('/play/compile', {
       method: 'POST',
-      body: JSON.stringify({ body: this.inputEl?.value, version: 2 }),
+      body: JSON.stringify({ body: codeWithModFile, version: 2 }),
     })
       .then(res => res.json())
       .then(async ({ Events, Errors }) => {