diff --git a/static/frontend/frontend.js b/static/frontend/frontend.js
index 5619c0e..fad4e7f 100644
--- a/static/frontend/frontend.js
+++ b/static/frontend/frontend.js
@@ -1,4 +1,4 @@
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o=document.styleSheets[t],n=null;try{n=o.cssRules}catch(O){}if(!!n)for(var i=0;i<n.length;++i){var r=n[i],l=null;try{l=document.querySelectorAll(r.selectorText)}catch(O){}if(!(!l||!F(l,e))){var c=r.style.getPropertyValue("top"),E=r.style.getPropertyValue("bottom");if(c&&c!=="auto"||E&&E!=="auto")return!0}}}return!1};a.needsCentering=function(e){var t=window.getComputedStyle(e);return t.position!=="absolute"||e.style.top!=="auto"&&e.style.top!==""||e.style.bottom!=="auto"&&e.style.bottom!==""?!1:!a.isInlinePositionSetByStylesheet(e)};a.forceRegisterDialog=function(e){if((window.HTMLDialogElement||e.showModal)&&console.warn("This browser already supports <dialog>, the polyfill may not work correctly",e),e.localName!=="dialog")throw new Error("Failed to register dialog: The element is not a dialog.");new L(e)};a.registerDialog=function(e){e.showModal||a.forceRegisterDialog(e)};a.DialogManager=function(){this.pendingDialogStack=[];var e=this.checkDOM_.bind(this);this.overlay=document.createElement("div"),this.overlay.className="_dialog_overlay",this.overlay.addEventListener("click",function(t){this.forwardTab_=void 0,t.stopPropagation(),e([])}.bind(this)),this.handleKey_=this.handleKey_.bind(this),this.handleFocus_=this.handleFocus_.bind(this),this.zIndexLow_=1e5,this.zIndexHigh_=1e5+150,this.forwardTab_=void 0,"MutationObserver"in window&&(this.mo_=new MutationObserver(function(t){var o=[];t.forEach(function(n){for(var i=0,r;r=n.removedNodes[i];++i){if(r instanceof Element)r.localName==="dialog"&&o.push(r);else continue;o=o.concat(r.querySelectorAll("dialog"))}}),o.length&&e(o)}))};a.DialogManager.prototype.blockDocument=function(){document.documentElement.addEventListener("focus",this.handleFocus_,!0),document.addEventListener("keydown",this.handleKey_),this.mo_&&this.mo_.observe(document,{childList:!0,subtree:!0})};a.DialogManager.prototype.unblockDocument=function(){document.documentElement.removeEventListener("focus",this.handleFocus_,!0),document.removeEventListener("keydown",this.handleKey_),this.mo_&&this.mo_.disconnect()};a.DialogManager.prototype.updateStacking=function(){for(var e=this.zIndexHigh_,t=0,o;o=this.pendingDialogStack[t];++t)o.updateZIndex(--e,--e),t===0&&(this.overlay.style.zIndex=--e);var n=this.pendingDialogStack[0];if(n){var i=n.dialog.parentNode||document.body;i.appendChild(this.overlay)}else this.overlay.parentNode&&this.overlay.parentNode.removeChild(this.overlay)};a.DialogManager.prototype.containedByTopDialog_=function(e){for(;e=f(e);){for(var t=0,o;o=this.pendingDialogStack[t];++t)if(o.dialog===e)return t===0;e=e.parentElement}return!1};a.DialogManager.prototype.handleFocus_=function(e){if(!this.containedByTopDialog_(e.target)&&document.activeElement!==document.documentElement&&(e.preventDefault(),e.stopPropagation(),T(e.target),this.forwardTab_!==void 0)){var t=this.pendingDialogStack[0],o=t.dialog,n=o.compareDocumentPosition(e.target);return n&Node.DOCUMENT_POSITION_PRECEDING&&(this.forwardTab_?t.focus_():e.target!==document.documentElement&&document.documentElement.focus()),!1}};a.DialogManager.prototype.handleKey_=function(e){if(this.forwardTab_=void 0,e.keyCode===27){e.preventDefault(),e.stopPropagation();var t=new d("cancel",{bubbles:!1,cancelable:!0}),o=this.pendingDialogStack[0];o&&o.dialog.dispatchEvent(t)&&o.dialog.close()}else e.keyCode===9&&(this.forwardTab_=!e.shiftKey)};a.DialogManager.prototype.checkDOM_=function(e){var t=this.pendingDialogStack.slice();t.forEach(function(o){e.indexOf(o.dialog)!==-1?o.downgradeModal():o.maybeHideModal()})};a.DialogManager.prototype.pushDialog=function(e){var t=(this.zIndexHigh_-this.zIndexLow_)/2-1;return this.pendingDialogStack.length>=t?!1:(this.pendingDialogStack.unshift(e)===1&&this.blockDocument(),this.updateStacking(),!0)};a.DialogManager.prototype.removeDialog=function(e){var t=this.pendingDialogStack.indexOf(e);t!==-1&&(this.pendingDialogStack.splice(t,1),this.pendingDialogStack.length===0&&this.unblockDocument(),this.updateStacking())};a.dm=new a.DialogManager;a.formSubmitter=null;a.useValue=null;window.HTMLDialogElement===void 0&&(v=document.createElement("form"),v.setAttribute("method","dialog"),v.method!=="dialog"&&(s=Object.getOwnPropertyDescriptor(HTMLFormElement.prototype,"method"),s&&(S=s.get,s.get=function(){return p(this)?"dialog":S.call(this)},k=s.set,s.set=function(e){return typeof e=="string"&&e.toLowerCase()==="dialog"?this.setAttribute("method",e):k.call(this,e)},Object.defineProperty(HTMLFormElement.prototype,"method",s))),document.addEventListener("click",function(e){if(a.formSubmitter=null,a.useValue=null,!e.defaultPrevented){var t=e.target;if(!(!t||!p(t.form))){var o=t.type==="submit"&&["button","input"].indexOf(t.localName)>-1;if(!o){if(!(t.localName==="input"&&t.type==="image"))return;a.useValue=e.offsetX+","+e.offsetY}var n=f(t);!n||(a.formSubmitter=t)}}},!1),D=HTMLFormElement.prototype.submit,x=function(){if(!p(this))return D.call(this);var e=f(this);e&&e.close()},HTMLFormElement.prototype.submit=x,document.addEventListener("submit",function(e){if(!e.defaultPrevented){var t=e.target;if(!!p(t)){e.preventDefault();var o=f(t);if(!!o){var n=a.formSubmitter;n&&n.form===t?o.close(a.useValue||n.value):o.close(),a.formSubmitter=null}}}},!1));var v,s,S,k,D,x,B=a});function I(){let e=document.querySelector(".js-header"),t=document.querySelectorAll(".js-headerMenuButton");t.forEach(n=>{n.addEventListener("click",i=>{i.preventDefault(),e?.classList.toggle("is-active"),n.setAttribute("aria-expanded",String(e?.classList.contains("is-active")))})}),document.querySelector(".js-scrim")?.addEventListener("click",n=>{n.preventDefault(),e?.classList.remove("is-active"),t.forEach(i=>{i.setAttribute("aria-expanded",String(e?.classList.contains("is-active")))})})}function q(){let e=document.querySelector(".js-searchForm"),t=document.querySelector(".js-expandSearch"),o=e?.querySelector("input"),n=document.querySelector(".js-headerLogo"),i=document.querySelector(".js-headerMenuButton");t?.addEventListener("click",()=>{e?.classList.add("go-SearchForm--expanded"),n?.classList.add("go-Header-logo--hidden"),i?.classList.add("go-Header-navOpen--hidden"),o?.focus()}),document?.addEventListener("click",r=>{e?.contains(r.target)||(e?.classList.remove("go-SearchForm--expanded"),n?.classList.remove("go-Header-logo--hidden"),i?.classList.remove("go-Header-navOpen--hidden"))})}document.querySelectorAll(".js-searchModeSelect").forEach(e=>{e.addEventListener("change",t=>{let o=new URLSearchParams(window.location.search),i=Object.fromEntries(o.entries()).q;i&&(window.location.search=`q=${i}&m=${t.target.value}`)})});I();q();var m=class{constructor(t){this.el=t;this.data=t.dataset.toCopy??t.innerText,!this.data&&t.parentElement?.classList.contains("go-InputGroup")&&(this.data=(this.data||t.parentElement?.querySelector("input")?.value)??""),t.addEventListener("click",o=>this.handleCopyClick(o))}handleCopyClick(t){t.preventDefault();let o=1e3;if(!navigator.clipboard){this.showTooltipText("Unable to copy",o);return}navigator.clipboard.writeText(this.data).then(()=>{this.showTooltipText("Copied!",o)}).catch(()=>{this.showTooltipText("Unable to copy",o)})}showTooltipText(t,o){this.el.setAttribute("data-tooltip",t),setTimeout(()=>this.el.setAttribute("data-tooltip",""),o)}};var g=class{constructor(t){this.el=t;document.addEventListener("click",o=>{this.el.contains(o.target)||this.el.removeAttribute("open")})}};var y=class{constructor(t){this.el=t;this.el.addEventListener("change",o=>{let n=o.target,i=n.value;n.value.startsWith("/")||(i="/"+i),window.location.href=i})}};var b=class{constructor(t){this.el=t;!window.HTMLDialogElement&&!t.showModal&&Promise.resolve().then(()=>H()).then(({default:i})=>{i.registerDialog(t)});let o=t.id,n=document.querySelector(`[aria-controls="${o}"]`);n&&n.addEventListener("click",()=>{this.el.showModal?this.el.showModal():this.el.open=!0,t.querySelector("input")?.focus()});for(let i of this.el.querySelectorAll("[data-modal-close]"))i.addEventListener("click",()=>{this.el.close?this.el.close():this.el.open=!1})}};var u={};M(u,{func:()=>R,track:()=>w});function w(e,t,o,n){window.dataLayer??=[],typeof e=="string"?window.dataLayer.push({event:e,event_category:t,event_action:o,event_label:n}):window.dataLayer.push(e)}function R(e){window.dataLayer??=[],window.dataLayer.push(e)}var A=class{constructor(){this.handlers={},document.addEventListener("keydown",t=>this.handleKeyPress(t))}on(t,o,n,i){return this.handlers[t]??=new Set,this.handlers[t].add({description:o,callback:n,...i}),this}handleKeyPress(t){for(let o of this.handlers[t.key]??new Set){if(o.target&&o.target!==t.target)return;let n=t.target;if(!o.target&&(n?.tagName==="INPUT"||n?.tagName==="SELECT"||n?.tagName==="TEXTAREA")||n?.isContentEditable||o.withMeta&&!(t.ctrlKey||t.metaKey)||!o.withMeta&&(t.ctrlKey||t.metaKey))return;w("keypress","hotkeys",`${t.key} pressed`,o.description),o.callback(t)}}},h=new A;for(let e of document.querySelectorAll(".js-clipboard"))new m(e);for(let e of document.querySelectorAll(".js-modal"))new b(e);for(let e of document.querySelectorAll(".js-tooltip"))new g(e);for(let e of document.querySelectorAll(".js-selectNav"))new y(e);h.on("t","toggle theme",()=>{let e="dark";document.documentElement.getAttribute("data-theme")==="dark"&&(e="light"),document.documentElement.setAttribute("data-theme",e),document.cookie=`prefers-color-scheme=${e};path=/;max-age=31536000;`});h.on("/","focus search",e=>{let t=Array.from(document.querySelectorAll(".js-searchFocus")).pop();t&&!window.navigator.userAgent.includes("Firefox")&&(e.preventDefault(),t.focus())});h.on("y","set canonical url",()=>{let e=document.querySelector(".js-canonicalURLPath")?.dataset.canonicalUrlPath;e&&e!==""&&window.history.replaceState(null,"",e)});(function(){u.track({"gtm.start":new Date().getTime(),event:"gtm.js"})})();function C(){let e=new URLSearchParams(window.location.search),t=e.get("utm_source");if(t!=="gopls"&&t!=="godoc"&&t!=="pkggodev")return;let o=new URL(window.location.href);e.delete("utm_source"),o.search=e.toString(),window.history.replaceState(null,"",o.toString())}document.querySelector(".js-gtmID")?.dataset.gtmid&&window.dataLayer?u.func(function(){C()}):C();})();
 /*!
  * @license
  * Copyright 2019-2020 The Go Authors. All rights reserved.
diff --git a/static/frontend/frontend.js.map b/static/frontend/frontend.js.map
index 65d6161..4a17255 100644
--- a/static/frontend/frontend.js.map
+++ b/static/frontend/frontend.js.map
@@ -1,7 +1,7 @@
 {
   "version": 3,
   "sources": ["../../third_party/dialog-polyfill/dialog-polyfill.esm.js", "../shared/header/header.ts", "../shared/clipboard/clipboard.ts", "../shared/tooltip/tooltip.ts", "../shared/outline/select.ts", "../shared/modal/modal.ts", "../shared/analytics/analytics.ts", "../shared/keyboard/keyboard.ts", "../shared/shared.ts", "frontend.ts"],
-  "sourcesContent": ["// nb. This is for IE10 and lower _only_.\nvar supportCustomEvent = window.CustomEvent;\nif (!supportCustomEvent || typeof supportCustomEvent === 'object') {\n  supportCustomEvent = function CustomEvent(event, x) {\n    x = x || {};\n    var ev = document.createEvent('CustomEvent');\n    ev.initCustomEvent(event, !!x.bubbles, !!x.cancelable, x.detail || null);\n    return ev;\n  };\n  supportCustomEvent.prototype = window.Event.prototype;\n}\n\n/**\n * @param {Element} el to check for stacking context\n * @return {boolean} whether this el or its parents creates a stacking context\n */\nfunction createsStackingContext(el) {\n  while (el && el !== document.body) {\n    var s = window.getComputedStyle(el);\n    var invalid = function(k, ok) {\n      return !(s[k] === undefined || s[k] === ok);\n    };\n\n    if (s.opacity < 1 ||\n        invalid('zIndex', 'auto') ||\n        invalid('transform', 'none') ||\n        invalid('mixBlendMode', 'normal') ||\n        invalid('filter', 'none') ||\n        invalid('perspective', 'none') ||\n        s['isolation'] === 'isolate' ||\n        s.position === 'fixed' ||\n        s.webkitOverflowScrolling === 'touch') {\n      return true;\n    }\n    el = el.parentElement;\n  }\n  return false;\n}\n\n/**\n * Finds the nearest <dialog> from the passed element.\n *\n * @param {Element} el to search from\n * @return {HTMLDialogElement} dialog found\n */\nfunction findNearestDialog(el) {\n  while (el) {\n    if (el.localName === 'dialog') {\n      return /** @type {HTMLDialogElement} */ (el);\n    }\n    el = el.parentElement;\n  }\n  return null;\n}\n\n/**\n * Blur the specified element, as long as it's not the HTML body element.\n * This works around an IE9/10 bug - blurring the body causes Windows to\n * blur the whole application.\n *\n * @param {Element} el to blur\n */\nfunction safeBlur(el) {\n  if (el && el.blur && el !== document.body) {\n    el.blur();\n  }\n}\n\n/**\n * @param {!NodeList} nodeList to search\n * @param {Node} node to find\n * @return {boolean} whether node is inside nodeList\n */\nfunction inNodeList(nodeList, node) {\n  for (var i = 0; i < nodeList.length; ++i) {\n    if (nodeList[i] === node) {\n      return true;\n    }\n  }\n  return false;\n}\n\n/**\n * @param {HTMLFormElement} el to check\n * @return {boolean} whether this form has method=\"dialog\"\n */\nfunction isFormMethodDialog(el) {\n  if (!el || !el.hasAttribute('method')) {\n    return false;\n  }\n  return el.getAttribute('method').toLowerCase() === 'dialog';\n}\n\n/**\n * @param {!HTMLDialogElement} dialog to upgrade\n * @constructor\n */\nfunction dialogPolyfillInfo(dialog) {\n  this.dialog_ = dialog;\n  this.replacedStyleTop_ = false;\n  this.openAsModal_ = false;\n\n  // Set a11y role. Browsers that support dialog implicitly know this already.\n  if (!dialog.hasAttribute('role')) {\n    dialog.setAttribute('role', 'dialog');\n  }\n\n  dialog.show = this.show.bind(this);\n  dialog.showModal = this.showModal.bind(this);\n  dialog.close = this.close.bind(this);\n\n  if (!('returnValue' in dialog)) {\n    dialog.returnValue = '';\n  }\n\n  if ('MutationObserver' in window) {\n    var mo = new MutationObserver(this.maybeHideModal.bind(this));\n    mo.observe(dialog, {attributes: true, attributeFilter: ['open']});\n  } else {\n    // IE10 and below support. Note that DOMNodeRemoved etc fire _before_ removal. They also\n    // seem to fire even if the element was removed as part of a parent removal. Use the removed\n    // events to force downgrade (useful if removed/immediately added).\n    var removed = false;\n    var cb = function() {\n      removed ? this.downgradeModal() : this.maybeHideModal();\n      removed = false;\n    }.bind(this);\n    var timeout;\n    var delayModel = function(ev) {\n      if (ev.target !== dialog) { return; }  // not for a child element\n      var cand = 'DOMNodeRemoved';\n      removed |= (ev.type.substr(0, cand.length) === cand);\n      window.clearTimeout(timeout);\n      timeout = window.setTimeout(cb, 0);\n    };\n    ['DOMAttrModified', 'DOMNodeRemoved', 'DOMNodeRemovedFromDocument'].forEach(function(name) {\n      dialog.addEventListener(name, delayModel);\n    });\n  }\n  // Note that the DOM is observed inside DialogManager while any dialog\n  // is being displayed as a modal, to catch modal removal from the DOM.\n\n  Object.defineProperty(dialog, 'open', {\n    set: this.setOpen.bind(this),\n    get: dialog.hasAttribute.bind(dialog, 'open')\n  });\n\n  this.backdrop_ = document.createElement('div');\n  this.backdrop_.className = 'backdrop';\n  this.backdrop_.addEventListener('click', this.backdropClick_.bind(this));\n}\n\ndialogPolyfillInfo.prototype = {\n\n  get dialog() {\n    return this.dialog_;\n  },\n\n  /**\n   * Maybe remove this dialog from the modal top layer. This is called when\n   * a modal dialog may no longer be tenable, e.g., when the dialog is no\n   * longer open or is no longer part of the DOM.\n   */\n  maybeHideModal: function() {\n    if (this.dialog_.hasAttribute('open') && document.body.contains(this.dialog_)) { return; }\n    this.downgradeModal();\n  },\n\n  /**\n   * Remove this dialog from the modal top layer, leaving it as a non-modal.\n   */\n  downgradeModal: function() {\n    if (!this.openAsModal_) { return; }\n    this.openAsModal_ = false;\n    this.dialog_.style.zIndex = '';\n\n    // This won't match the native <dialog> exactly because if the user set top on a centered\n    // polyfill dialog, that top gets thrown away when the dialog is closed. Not sure it's\n    // possible to polyfill this perfectly.\n    if (this.replacedStyleTop_) {\n      this.dialog_.style.top = '';\n      this.replacedStyleTop_ = false;\n    }\n\n    // Clear the backdrop and remove from the manager.\n    this.backdrop_.parentNode && this.backdrop_.parentNode.removeChild(this.backdrop_);\n    dialogPolyfill.dm.removeDialog(this);\n  },\n\n  /**\n   * @param {boolean} value whether to open or close this dialog\n   */\n  setOpen: function(value) {\n    if (value) {\n      this.dialog_.hasAttribute('open') || this.dialog_.setAttribute('open', '');\n    } else {\n      this.dialog_.removeAttribute('open');\n      this.maybeHideModal();  // nb. redundant with MutationObserver\n    }\n  },\n\n  /**\n   * Handles clicks on the fake .backdrop element, redirecting them as if\n   * they were on the dialog itself.\n   *\n   * @param {!Event} e to redirect\n   */\n  backdropClick_: function(e) {\n    if (!this.dialog_.hasAttribute('tabindex')) {\n      // Clicking on the backdrop should move the implicit cursor, even if dialog cannot be\n      // focused. Create a fake thing to focus on. If the backdrop was _before_ the dialog, this\n      // would not be needed - clicks would move the implicit cursor there.\n      var fake = document.createElement('div');\n      this.dialog_.insertBefore(fake, this.dialog_.firstChild);\n      fake.tabIndex = -1;\n      fake.focus();\n      this.dialog_.removeChild(fake);\n    } else {\n      this.dialog_.focus();\n    }\n\n    var redirectedEvent = document.createEvent('MouseEvents');\n    redirectedEvent.initMouseEvent(e.type, e.bubbles, e.cancelable, window,\n        e.detail, e.screenX, e.screenY, e.clientX, e.clientY, e.ctrlKey,\n        e.altKey, e.shiftKey, e.metaKey, e.button, e.relatedTarget);\n    this.dialog_.dispatchEvent(redirectedEvent);\n    e.stopPropagation();\n  },\n\n  /**\n   * Focuses on the first focusable element within the dialog. This will always blur the current\n   * focus, even if nothing within the dialog is found.\n   */\n  focus_: function() {\n    // Find element with `autofocus` attribute, or fall back to the first form/tabindex control.\n    var target = this.dialog_.querySelector('[autofocus]:not([disabled])');\n    if (!target && this.dialog_.tabIndex >= 0) {\n      target = this.dialog_;\n    }\n    if (!target) {\n      // Note that this is 'any focusable area'. This list is probably not exhaustive, but the\n      // alternative involves stepping through and trying to focus everything.\n      var opts = ['button', 'input', 'keygen', 'select', 'textarea'];\n      var query = opts.map(function(el) {\n        return el + ':not([disabled])';\n      });\n      // TODO(samthor): tabindex values that are not numeric are not focusable.\n      query.push('[tabindex]:not([disabled]):not([tabindex=\"\"])');  // tabindex != \"\", not disabled\n      target = this.dialog_.querySelector(query.join(', '));\n    }\n    safeBlur(document.activeElement);\n    target && target.focus();\n  },\n\n  /**\n   * Sets the zIndex for the backdrop and dialog.\n   *\n   * @param {number} dialogZ\n   * @param {number} backdropZ\n   */\n  updateZIndex: function(dialogZ, backdropZ) {\n    if (dialogZ < backdropZ) {\n      throw new Error('dialogZ should never be < backdropZ');\n    }\n    this.dialog_.style.zIndex = dialogZ;\n    this.backdrop_.style.zIndex = backdropZ;\n  },\n\n  /**\n   * Shows the dialog. If the dialog is already open, this does nothing.\n   */\n  show: function() {\n    if (!this.dialog_.open) {\n      this.setOpen(true);\n      this.focus_();\n    }\n  },\n\n  /**\n   * Show this dialog modally.\n   */\n  showModal: function() {\n    if (this.dialog_.hasAttribute('open')) {\n      throw new Error('Failed to execute \\'showModal\\' on dialog: The element is already open, and therefore cannot be opened modally.');\n    }\n    if (!document.body.contains(this.dialog_)) {\n      throw new Error('Failed to execute \\'showModal\\' on dialog: The element is not in a Document.');\n    }\n    if (!dialogPolyfill.dm.pushDialog(this)) {\n      throw new Error('Failed to execute \\'showModal\\' on dialog: There are too many open modal dialogs.');\n    }\n\n    if (createsStackingContext(this.dialog_.parentElement)) {\n      console.warn('A dialog is being shown inside a stacking context. ' +\n          'This may cause it to be unusable. For more information, see this link: ' +\n          'https://github.com/GoogleChrome/dialog-polyfill/#stacking-context');\n    }\n\n    this.setOpen(true);\n    this.openAsModal_ = true;\n\n    // Optionally center vertically, relative to the current viewport.\n    if (dialogPolyfill.needsCentering(this.dialog_)) {\n      dialogPolyfill.reposition(this.dialog_);\n      this.replacedStyleTop_ = true;\n    } else {\n      this.replacedStyleTop_ = false;\n    }\n\n    // Insert backdrop.\n    this.dialog_.parentNode.insertBefore(this.backdrop_, this.dialog_.nextSibling);\n\n    // Focus on whatever inside the dialog.\n    this.focus_();\n  },\n\n  /**\n   * Closes this HTMLDialogElement. This is optional vs clearing the open\n   * attribute, however this fires a 'close' event.\n   *\n   * @param {string=} opt_returnValue to use as the returnValue\n   */\n  close: function(opt_returnValue) {\n    if (!this.dialog_.hasAttribute('open')) {\n      throw new Error('Failed to execute \\'close\\' on dialog: The element does not have an \\'open\\' attribute, and therefore cannot be closed.');\n    }\n    this.setOpen(false);\n\n    // Leave returnValue untouched in case it was set directly on the element\n    if (opt_returnValue !== undefined) {\n      this.dialog_.returnValue = opt_returnValue;\n    }\n\n    // Triggering \"close\" event for any attached listeners on the <dialog>.\n    var closeEvent = new supportCustomEvent('close', {\n      bubbles: false,\n      cancelable: false\n    });\n    this.dialog_.dispatchEvent(closeEvent);\n  }\n\n};\n\nvar dialogPolyfill = {};\n\ndialogPolyfill.reposition = function(element) {\n  var scrollTop = document.body.scrollTop || document.documentElement.scrollTop;\n  var topValue = scrollTop + (window.innerHeight - element.offsetHeight) / 2;\n  element.style.top = Math.max(scrollTop, topValue) + 'px';\n};\n\ndialogPolyfill.isInlinePositionSetByStylesheet = function(element) {\n  for (var i = 0; i < document.styleSheets.length; ++i) {\n    var styleSheet = document.styleSheets[i];\n    var cssRules = null;\n    // Some browsers throw on cssRules.\n    try {\n      cssRules = styleSheet.cssRules;\n    } catch (e) {}\n    if (!cssRules) { continue; }\n    for (var j = 0; j < cssRules.length; ++j) {\n      var rule = cssRules[j];\n      var selectedNodes = null;\n      // Ignore errors on invalid selector texts.\n      try {\n        selectedNodes = document.querySelectorAll(rule.selectorText);\n      } catch(e) {}\n      if (!selectedNodes || !inNodeList(selectedNodes, element)) {\n        continue;\n      }\n      var cssTop = rule.style.getPropertyValue('top');\n      var cssBottom = rule.style.getPropertyValue('bottom');\n      if ((cssTop && cssTop !== 'auto') || (cssBottom && cssBottom !== 'auto')) {\n        return true;\n      }\n    }\n  }\n  return false;\n};\n\ndialogPolyfill.needsCentering = function(dialog) {\n  var computedStyle = window.getComputedStyle(dialog);\n  if (computedStyle.position !== 'absolute') {\n    return false;\n  }\n\n  // We must determine whether the top/bottom specified value is non-auto.  In\n  // WebKit/Blink, checking computedStyle.top == 'auto' is sufficient, but\n  // Firefox returns the used value. So we do this crazy thing instead: check\n  // the inline style and then go through CSS rules.\n  if ((dialog.style.top !== 'auto' && dialog.style.top !== '') ||\n      (dialog.style.bottom !== 'auto' && dialog.style.bottom !== '')) {\n    return false;\n  }\n  return !dialogPolyfill.isInlinePositionSetByStylesheet(dialog);\n};\n\n/**\n * @param {!Element} element to force upgrade\n */\ndialogPolyfill.forceRegisterDialog = function(element) {\n  if (window.HTMLDialogElement || element.showModal) {\n    console.warn('This browser already supports <dialog>, the polyfill ' +\n        'may not work correctly', element);\n  }\n  if (element.localName !== 'dialog') {\n    throw new Error('Failed to register dialog: The element is not a dialog.');\n  }\n  new dialogPolyfillInfo(/** @type {!HTMLDialogElement} */ (element));\n};\n\n/**\n * @param {!Element} element to upgrade, if necessary\n */\ndialogPolyfill.registerDialog = function(element) {\n  if (!element.showModal) {\n    dialogPolyfill.forceRegisterDialog(element);\n  }\n};\n\n/**\n * @constructor\n */\ndialogPolyfill.DialogManager = function() {\n  /** @type {!Array<!dialogPolyfillInfo>} */\n  this.pendingDialogStack = [];\n\n  var checkDOM = this.checkDOM_.bind(this);\n\n  // The overlay is used to simulate how a modal dialog blocks the document.\n  // The blocking dialog is positioned on top of the overlay, and the rest of\n  // the dialogs on the pending dialog stack are positioned below it. In the\n  // actual implementation, the modal dialog stacking is controlled by the\n  // top layer, where z-index has no effect.\n  this.overlay = document.createElement('div');\n  this.overlay.className = '_dialog_overlay';\n  this.overlay.addEventListener('click', function(e) {\n    this.forwardTab_ = undefined;\n    e.stopPropagation();\n    checkDOM([]);  // sanity-check DOM\n  }.bind(this));\n\n  this.handleKey_ = this.handleKey_.bind(this);\n  this.handleFocus_ = this.handleFocus_.bind(this);\n\n  this.zIndexLow_ = 100000;\n  this.zIndexHigh_ = 100000 + 150;\n\n  this.forwardTab_ = undefined;\n\n  if ('MutationObserver' in window) {\n    this.mo_ = new MutationObserver(function(records) {\n      var removed = [];\n      records.forEach(function(rec) {\n        for (var i = 0, c; c = rec.removedNodes[i]; ++i) {\n          if (!(c instanceof Element)) {\n            continue;\n          } else if (c.localName === 'dialog') {\n            removed.push(c);\n          }\n          removed = removed.concat(c.querySelectorAll('dialog'));\n        }\n      });\n      removed.length && checkDOM(removed);\n    });\n  }\n};\n\n/**\n * Called on the first modal dialog being shown. Adds the overlay and related\n * handlers.\n */\ndialogPolyfill.DialogManager.prototype.blockDocument = function() {\n  document.documentElement.addEventListener('focus', this.handleFocus_, true);\n  document.addEventListener('keydown', this.handleKey_);\n  this.mo_ && this.mo_.observe(document, {childList: true, subtree: true});\n};\n\n/**\n * Called on the first modal dialog being removed, i.e., when no more modal\n * dialogs are visible.\n */\ndialogPolyfill.DialogManager.prototype.unblockDocument = function() {\n  document.documentElement.removeEventListener('focus', this.handleFocus_, true);\n  document.removeEventListener('keydown', this.handleKey_);\n  this.mo_ && this.mo_.disconnect();\n};\n\n/**\n * Updates the stacking of all known dialogs.\n */\ndialogPolyfill.DialogManager.prototype.updateStacking = function() {\n  var zIndex = this.zIndexHigh_;\n\n  for (var i = 0, dpi; dpi = this.pendingDialogStack[i]; ++i) {\n    dpi.updateZIndex(--zIndex, --zIndex);\n    if (i === 0) {\n      this.overlay.style.zIndex = --zIndex;\n    }\n  }\n\n  // Make the overlay a sibling of the dialog itself.\n  var last = this.pendingDialogStack[0];\n  if (last) {\n    var p = last.dialog.parentNode || document.body;\n    p.appendChild(this.overlay);\n  } else if (this.overlay.parentNode) {\n    this.overlay.parentNode.removeChild(this.overlay);\n  }\n};\n\n/**\n * @param {Element} candidate to check if contained or is the top-most modal dialog\n * @return {boolean} whether candidate is contained in top dialog\n */\ndialogPolyfill.DialogManager.prototype.containedByTopDialog_ = function(candidate) {\n  while (candidate = findNearestDialog(candidate)) {\n    for (var i = 0, dpi; dpi = this.pendingDialogStack[i]; ++i) {\n      if (dpi.dialog === candidate) {\n        return i === 0;  // only valid if top-most\n      }\n    }\n    candidate = candidate.parentElement;\n  }\n  return false;\n};\n\ndialogPolyfill.DialogManager.prototype.handleFocus_ = function(event) {\n  if (this.containedByTopDialog_(event.target)) { return; }\n\n  if (document.activeElement === document.documentElement) { return; }\n\n  event.preventDefault();\n  event.stopPropagation();\n  safeBlur(/** @type {Element} */ (event.target));\n\n  if (this.forwardTab_ === undefined) { return; }  // move focus only from a tab key\n\n  var dpi = this.pendingDialogStack[0];\n  var dialog = dpi.dialog;\n  var position = dialog.compareDocumentPosition(event.target);\n  if (position & Node.DOCUMENT_POSITION_PRECEDING) {\n    if (this.forwardTab_) {\n      // forward\n      dpi.focus_();\n    } else if (event.target !== document.documentElement) {\n      // backwards if we're not already focused on <html>\n      document.documentElement.focus();\n    }\n  }\n\n  return false;\n};\n\ndialogPolyfill.DialogManager.prototype.handleKey_ = function(event) {\n  this.forwardTab_ = undefined;\n  if (event.keyCode === 27) {\n    event.preventDefault();\n    event.stopPropagation();\n    var cancelEvent = new supportCustomEvent('cancel', {\n      bubbles: false,\n      cancelable: true\n    });\n    var dpi = this.pendingDialogStack[0];\n    if (dpi && dpi.dialog.dispatchEvent(cancelEvent)) {\n      dpi.dialog.close();\n    }\n  } else if (event.keyCode === 9) {\n    this.forwardTab_ = !event.shiftKey;\n  }\n};\n\n/**\n * Finds and downgrades any known modal dialogs that are no longer displayed. Dialogs that are\n * removed and immediately readded don't stay modal, they become normal.\n *\n * @param {!Array<!HTMLDialogElement>} removed that have definitely been removed\n */\ndialogPolyfill.DialogManager.prototype.checkDOM_ = function(removed) {\n  // This operates on a clone because it may cause it to change. Each change also calls\n  // updateStacking, which only actually needs to happen once. But who removes many modal dialogs\n  // at a time?!\n  var clone = this.pendingDialogStack.slice();\n  clone.forEach(function(dpi) {\n    if (removed.indexOf(dpi.dialog) !== -1) {\n      dpi.downgradeModal();\n    } else {\n      dpi.maybeHideModal();\n    }\n  });\n};\n\n/**\n * @param {!dialogPolyfillInfo} dpi\n * @return {boolean} whether the dialog was allowed\n */\ndialogPolyfill.DialogManager.prototype.pushDialog = function(dpi) {\n  var allowed = (this.zIndexHigh_ - this.zIndexLow_) / 2 - 1;\n  if (this.pendingDialogStack.length >= allowed) {\n    return false;\n  }\n  if (this.pendingDialogStack.unshift(dpi) === 1) {\n    this.blockDocument();\n  }\n  this.updateStacking();\n  return true;\n};\n\n/**\n * @param {!dialogPolyfillInfo} dpi\n */\ndialogPolyfill.DialogManager.prototype.removeDialog = function(dpi) {\n  var index = this.pendingDialogStack.indexOf(dpi);\n  if (index === -1) { return; }\n\n  this.pendingDialogStack.splice(index, 1);\n  if (this.pendingDialogStack.length === 0) {\n    this.unblockDocument();\n  }\n  this.updateStacking();\n};\n\ndialogPolyfill.dm = new dialogPolyfill.DialogManager();\ndialogPolyfill.formSubmitter = null;\ndialogPolyfill.useValue = null;\n\n/**\n * Installs global handlers, such as click listers and native method overrides. These are needed\n * even if a no dialog is registered, as they deal with <form method=\"dialog\">.\n */\nif (window.HTMLDialogElement === undefined) {\n\n  /**\n   * If HTMLFormElement translates method=\"DIALOG\" into 'get', then replace the descriptor with\n   * one that returns the correct value.\n   */\n  var testForm = document.createElement('form');\n  testForm.setAttribute('method', 'dialog');\n  if (testForm.method !== 'dialog') {\n    var methodDescriptor = Object.getOwnPropertyDescriptor(HTMLFormElement.prototype, 'method');\n    if (methodDescriptor) {\n      // nb. Some older iOS and older PhantomJS fail to return the descriptor. Don't do anything\n      // and don't bother to update the element.\n      var realGet = methodDescriptor.get;\n      methodDescriptor.get = function() {\n        if (isFormMethodDialog(this)) {\n          return 'dialog';\n        }\n        return realGet.call(this);\n      };\n      var realSet = methodDescriptor.set;\n      methodDescriptor.set = function(v) {\n        if (typeof v === 'string' && v.toLowerCase() === 'dialog') {\n          return this.setAttribute('method', v);\n        }\n        return realSet.call(this, v);\n      };\n      Object.defineProperty(HTMLFormElement.prototype, 'method', methodDescriptor);\n    }\n  }\n\n  /**\n   * Global 'click' handler, to capture the <input type=\"submit\"> or <button> element which has\n   * submitted a <form method=\"dialog\">. Needed as Safari and others don't report this inside\n   * document.activeElement.\n   */\n  document.addEventListener('click', function(ev) {\n    dialogPolyfill.formSubmitter = null;\n    dialogPolyfill.useValue = null;\n    if (ev.defaultPrevented) { return; }  // e.g. a submit which prevents default submission\n\n    var target = /** @type {Element} */ (ev.target);\n    if (!target || !isFormMethodDialog(target.form)) { return; }\n\n    var valid = (target.type === 'submit' && ['button', 'input'].indexOf(target.localName) > -1);\n    if (!valid) {\n      if (!(target.localName === 'input' && target.type === 'image')) { return; }\n      // this is a <input type=\"image\">, which can submit forms\n      dialogPolyfill.useValue = ev.offsetX + ',' + ev.offsetY;\n    }\n\n    var dialog = findNearestDialog(target);\n    if (!dialog) { return; }\n\n    dialogPolyfill.formSubmitter = target;\n\n  }, false);\n\n  /**\n   * Replace the native HTMLFormElement.submit() method, as it won't fire the\n   * submit event and give us a chance to respond.\n   */\n  var nativeFormSubmit = HTMLFormElement.prototype.submit;\n  var replacementFormSubmit = function () {\n    if (!isFormMethodDialog(this)) {\n      return nativeFormSubmit.call(this);\n    }\n    var dialog = findNearestDialog(this);\n    dialog && dialog.close();\n  };\n  HTMLFormElement.prototype.submit = replacementFormSubmit;\n\n  /**\n   * Global form 'dialog' method handler. Closes a dialog correctly on submit\n   * and possibly sets its return value.\n   */\n  document.addEventListener('submit', function(ev) {\n    if (ev.defaultPrevented) { return; }  // e.g. a submit which prevents default submission\n\n    var form = /** @type {HTMLFormElement} */ (ev.target);\n    if (!isFormMethodDialog(form)) { return; }\n    ev.preventDefault();\n\n    var dialog = findNearestDialog(form);\n    if (!dialog) { return; }\n\n    // Forms can only be submitted via .submit() or a click (?), but anyway: sanity-check that\n    // the submitter is correct before using its value as .returnValue.\n    var s = dialogPolyfill.formSubmitter;\n    if (s && s.form === form) {\n      dialog.close(dialogPolyfill.useValue || s.value);\n    } else {\n      dialog.close();\n    }\n    dialogPolyfill.formSubmitter = null;\n\n  }, false);\n}\n\nexport default dialogPolyfill;\n", "function registerHeaderListeners() {\n  const header = document.querySelector('.js-header');\n  const menuButtons = document.querySelectorAll('.js-headerMenuButton');\n  menuButtons.forEach(button => {\n    button.addEventListener('click', e => {\n      e.preventDefault();\n      header?.classList.toggle('is-active');\n      button.setAttribute('aria-expanded', String(header?.classList.contains('is-active')));\n    });\n  });\n\n  const scrim = document.querySelector('.js-scrim');\n  scrim?.addEventListener('click', e => {\n    e.preventDefault();\n    header?.classList.remove('is-active');\n    menuButtons.forEach(button => {\n      button.setAttribute('aria-expanded', String(header?.classList.contains('is-active')));\n    });\n  });\n}\n\nfunction registerSearchFormListeners() {\n  const BREAKPOINT = 512;\n  const logo = document.querySelector('.js-headerLogo');\n  const form = document.querySelector<HTMLFormElement>('.js-searchForm');\n  const button = document.querySelector('.js-searchFormSubmit');\n  const input = form?.querySelector('input');\n\n  renderForm();\n\n  window.addEventListener('resize', renderForm);\n\n  function renderForm() {\n    if (window.innerWidth > BREAKPOINT) {\n      logo?.classList.remove('go-Header-logo--hidden');\n      form?.classList.remove('go-SearchForm--open');\n      input?.removeEventListener('focus', showSearchBox);\n      input?.removeEventListener('keypress', handleKeypress);\n      input?.removeEventListener('focusout', hideSearchBox);\n    } else {\n      button?.addEventListener('click', handleSearchClick);\n      input?.addEventListener('focus', showSearchBox);\n      input?.addEventListener('keypress', handleKeypress);\n      input?.addEventListener('focusout', hideSearchBox);\n    }\n  }\n\n  /**\n   * Submits form if Enter key is pressed\n   */\n  function handleKeypress(e: KeyboardEvent) {\n    if (e.key === 'Enter') form?.submit();\n  }\n\n  /**\n   * Shows the search box when it receives focus (expands it from\n   * just the spyglass if we're on mobile).\n   */\n  function showSearchBox() {\n    logo?.classList.add('go-Header-logo--hidden');\n    form?.classList.add('go-SearchForm--open');\n  }\n\n  /**\n   * Hides the search box (shrinks to just the spyglass icon).\n   */\n  function hideSearchBox() {\n    logo?.classList.remove('go-Header-logo--hidden');\n    form?.classList.remove('go-SearchForm--open');\n  }\n\n  /**\n   * Expands the searchbox so input is visible and gives\n   * the input focus.\n   */\n  function handleSearchClick(e: Event) {\n    e.preventDefault();\n\n    showSearchBox();\n    input?.focus();\n  }\n}\n\n/**\n * Listen for changes in the search dropdown.\n *\n * TODO(https://golang.org/issue/44142): Fix this flow:\n * A user will likely expect to submit the search again after selecting the\n * type of search. The change event should trigger a form submission, so that the\n * search event is still captured in analytics without a manual instrumentation.\n */\ndocument.querySelectorAll('.js-searchModeSelect').forEach(el => {\n  el.addEventListener('change', e => {\n    const urlSearchParams = new URLSearchParams(window.location.search);\n    const params = Object.fromEntries(urlSearchParams.entries());\n    const query = params['q'];\n    if (query) {\n      window.location.search = `q=${query}&m=${(e.target as HTMLSelectElement).value}`;\n    }\n  });\n});\n\nregisterHeaderListeners();\nregisterSearchFormListeners();\n", "/**\n * @license\n * Copyright 2021 The Go Authors. All rights reserved.\n * Use of this source code is governed by a BSD-style\n * license that can be found in the LICENSE file.\n */\n\n/**\n * This class decorates an element to copy arbitrary data attached via a data-\n * attribute to the clipboard.\n */\nexport class ClipboardController {\n  /**\n   * The data to be copied to the clipboard.\n   */\n  private data: string;\n\n  /**\n   * @param el The element that will trigger copying text to the clipboard. The text is\n   * expected to be within its data-to-copy attribute.\n   */\n  constructor(private el: HTMLButtonElement) {\n    this.data = el.dataset['toCopy'] ?? el.innerText;\n    // if data-to-copy is empty and the button is part of an input group\n    // capture the value of the input.\n    if (!this.data && el.parentElement?.classList.contains('go-InputGroup')) {\n      this.data = (this.data || el.parentElement?.querySelector('input')?.value) ?? '';\n    }\n    el.addEventListener('click', e => this.handleCopyClick(e));\n  }\n\n  /**\n   * Handles when the primary element is clicked.\n   */\n  handleCopyClick(e: MouseEvent): void {\n    e.preventDefault();\n    const TOOLTIP_SHOW_DURATION_MS = 1000;\n\n    // This API is not available on iOS.\n    if (!navigator.clipboard) {\n      this.showTooltipText('Unable to copy', TOOLTIP_SHOW_DURATION_MS);\n      return;\n    }\n    navigator.clipboard\n      .writeText(this.data)\n      .then(() => {\n        this.showTooltipText('Copied!', TOOLTIP_SHOW_DURATION_MS);\n      })\n      .catch(() => {\n        this.showTooltipText('Unable to copy', TOOLTIP_SHOW_DURATION_MS);\n      });\n  }\n\n  /**\n   * Shows the given text in a tooltip for a specified amount of time, in milliseconds.\n   */\n  showTooltipText(text: string, durationMs: number): void {\n    this.el.setAttribute('data-tooltip', text);\n    setTimeout(() => this.el.setAttribute('data-tooltip', ''), durationMs);\n  }\n}\n", "/**\n * @license\n * Copyright 2021 The Go Authors. All rights reserved.\n * Use of this source code is governed by a BSD-style\n * license that can be found in the LICENSE file.\n */\n\n/**\n * ToolTipController handles closing tooltips on external clicks.\n */\nexport class ToolTipController {\n  constructor(private el: HTMLDetailsElement) {\n    document.addEventListener('click', e => {\n      const insideTooltip = this.el.contains(e.target as Element);\n      if (!insideTooltip) {\n        this.el.removeAttribute('open');\n      }\n    });\n  }\n}\n", "/**\n * @license\n * Copyright 2021 The Go Authors. All rights reserved.\n * Use of this source code is governed by a BSD-style\n * license that can be found in the LICENSE file.\n */\n\nimport { TreeNavController } from './tree.js';\n\nexport class SelectNavController {\n  constructor(private el: Element) {\n    this.el.addEventListener('change', e => {\n      const target = e.target as HTMLSelectElement;\n      let href = target.value;\n      if (!target.value.startsWith('/')) {\n        href = '/' + href;\n      }\n      window.location.href = href;\n    });\n  }\n}\n\nexport function makeSelectNav(tree: TreeNavController): HTMLLabelElement {\n  const label = document.createElement('label');\n  label.classList.add('go-Label');\n  label.setAttribute('aria-label', 'Menu');\n  const select = document.createElement('select');\n  select.classList.add('go-Select', 'js-selectNav');\n  label.appendChild(select);\n  const outline = document.createElement('optgroup');\n  outline.label = 'Outline';\n  select.appendChild(outline);\n  const groupMap: Record<string, HTMLOptGroupElement> = {};\n  let group: HTMLOptGroupElement;\n  for (const t of tree.treeitems) {\n    if (Number(t.depth) > 4) continue;\n    if (t.groupTreeitem) {\n      group = groupMap[t.groupTreeitem.label];\n      if (!group) {\n        group = groupMap[t.groupTreeitem.label] = document.createElement('optgroup');\n        group.label = t.groupTreeitem.label;\n        select.appendChild(group);\n      }\n    } else {\n      group = outline;\n    }\n    const o = document.createElement('option');\n    o.label = t.label;\n    o.textContent = t.label;\n    o.value = (t.el as HTMLAnchorElement).href.replace(window.location.origin, '').replace('/', '');\n    group.appendChild(o);\n  }\n  tree.addObserver(t => {\n    const value = select.querySelector<HTMLOptionElement>(`[label=\"${t.label}\"]`)?.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 * ModalController registers a dialog element with the polyfill if\n * necessary for the current browser, add adds event listeners to\n * close and open modals.\n */\nexport class ModalController {\n  constructor(private el: HTMLDialogElement) {\n    // Only load the dialog polyfill if necessary for the environment.\n    if (!window.HTMLDialogElement && !el.showModal) {\n      import('../../../third_party/dialog-polyfill/dialog-polyfill.esm.js').then(\n        ({ default: polyfill }) => {\n          polyfill.registerDialog(el);\n        }\n      );\n    }\n    const id = el.id;\n    const button = document.querySelector<HTMLButtonElement>(`[aria-controls=\"${id}\"]`);\n    if (button) {\n      button.addEventListener('click', () => {\n        if (this.el.showModal) {\n          this.el.showModal();\n        } else {\n          this.el.open = true;\n        }\n        el.querySelector('input')?.focus();\n      });\n    }\n    for (const close of this.el.querySelectorAll<HTMLButtonElement>('[data-modal-close]')) {\n      close.addEventListener('click', () => {\n        if (this.el.close) {\n          this.el.close();\n        } else {\n          this.el.open = false;\n        }\n      });\n    }\n  }\n}\n", "interface TagManagerEvent {\n  /**\n   * event is the name of the event, used to filter events in\n   * Google Analytics.\n   */\n  event: string;\n\n  /**\n   * event_category is a name that you supply as a way to group objects\n   * that to analyze. Typically, you will use the same category name\n   * multiple times over related UI elements (buttons, links, etc).\n   */\n  event_category?: string;\n\n  /**\n   * event_action is used to name the type of event or interaction you\n   * want to measure for a particular web object. For example, with a\n   * single \"form\" category, you can analyze a number of specific events\n   * with this parameter, such as: form entered, form submitted.\n   */\n  event_action?: string;\n\n  /**\n   * event_label provide additional information for events that you want\n   * to analyze, such as the text label of a link.\n   */\n  event_label?: string;\n\n  /**\n   * gtm.start is used to initialize Google Tag Manager.\n   */\n  'gtm.start'?: number;\n}\n\n// eslint-disable-next-line @typescript-eslint/no-unused-vars\ndeclare global {\n  interface Window {\n    dataLayer?: (TagManagerEvent | VoidFunction)[];\n    ga?: unknown;\n  }\n}\n\n/**\n * track sends events to Google Tag Manager.\n */\nexport function track(\n  event: string | TagManagerEvent,\n  category?: string,\n  action?: string,\n  label?: string\n): void {\n  window.dataLayer ??= [];\n  if (typeof event === 'string') {\n    window.dataLayer.push({\n      event,\n      event_category: category,\n      event_action: action,\n      event_label: label,\n    });\n  } else {\n    window.dataLayer.push(event);\n  }\n}\n\n/**\n * func adds functions to run sequentionally after\n * Google Tag Manager is ready.\n */\nexport function func(fn: () => void): void {\n  window.dataLayer ??= [];\n  window.dataLayer.push(fn);\n}\n", "/*!\n * @license\n * Copyright 2019-2020 The Go Authors. All rights reserved.\n * Use of this source code is governed by a BSD-style\n * license that can be found in the LICENSE file.\n */\n\nimport { track } from '../analytics/analytics';\n\n/**\n * Options are keyhandler callback options.\n */\ninterface Options {\n  /**\n   * target is the element the key event should filter on. The\n   * default target is the document.\n   */\n  target?: Element;\n\n  /**\n   * withMeta specifies if the event callback should fire when\n   * the key is pressed with a meta key (ctrl, alt, etc). By\n   * default meta keypresses are ignored.\n   */\n  withMeta?: boolean;\n}\n\n/**\n * KeyHandler is the config for a keyboard event callback.\n */\ninterface KeyHandler extends Options {\n  description: string;\n  callback: (e: KeyboardEvent) => void;\n}\n\n/**\n * KeyboardController controls event callbacks for sitewide\n * keyboard events. Multiple callbacks can be registered for\n * a single key and by default the controller ignores events\n * for text input targets.\n */\nclass KeyboardController {\n  handlers: Record<string, Set<KeyHandler>>;\n\n  constructor() {\n    this.handlers = {};\n    document.addEventListener('keydown', e => this.handleKeyPress(e));\n  }\n\n  /**\n   * on registers keyboard event callbacks.\n   * @param key the key to register.\n   * @param description name of the event.\n   * @param callback event callback.\n   * @param options set target and withMeta options to override the default behaviors.\n   */\n  on(key: string, description: string, callback: (e: KeyboardEvent) => void, options?: Options) {\n    this.handlers[key] ??= new Set();\n    this.handlers[key].add({ description, callback, ...options });\n    return this;\n  }\n\n  private handleKeyPress(e: KeyboardEvent) {\n    for (const handler of this.handlers[e.key] ?? new Set()) {\n      if (handler.target && handler.target !== e.target) {\n        return;\n      }\n      const t = e.target as HTMLElement | null;\n      if (\n        !handler.target &&\n        (t?.tagName === 'INPUT' || t?.tagName === 'SELECT' || t?.tagName === 'TEXTAREA')\n      ) {\n        return;\n      }\n      if (t?.isContentEditable) {\n        return;\n      }\n      if (\n        (handler.withMeta && !(e.ctrlKey || e.metaKey)) ||\n        (!handler.withMeta && (e.ctrlKey || e.metaKey))\n      ) {\n        return;\n      }\n      track('keypress', 'hotkeys', `${e.key} pressed`, handler.description);\n      handler.callback(e);\n    }\n  }\n}\n\nexport const keyboard = new KeyboardController();\n", "/**\n * @license\n * Copyright 2020 The Go Authors. All rights reserved.\n * Use of this source code is governed by a BSD-style\n * license that can be found in the LICENSE file.\n */\n\nimport './header/header';\nimport { ClipboardController } from './clipboard/clipboard';\nimport { ToolTipController } from './tooltip/tooltip';\nimport { SelectNavController } from './outline/select';\nimport { ModalController } from './modal/modal';\n\nexport { keyboard } from './keyboard/keyboard';\nexport * as analytics from './analytics/analytics';\n\nfor (const el of document.querySelectorAll<HTMLButtonElement>('.js-clipboard')) {\n  new ClipboardController(el);\n}\n\nfor (const el of document.querySelectorAll<HTMLDialogElement>('.js-modal')) {\n  new ModalController(el);\n}\n\nfor (const t of document.querySelectorAll<HTMLDetailsElement>('.js-tooltip')) {\n  new ToolTipController(t);\n}\n\nfor (const el of document.querySelectorAll<HTMLSelectElement>('.js-selectNav')) {\n  new SelectNavController(el);\n}\n", "/**\n * @license\n * Copyright 2020 The Go Authors. All rights reserved.\n * Use of this source code is governed by a BSD-style\n * license that can be found in the LICENSE file.\n */\n\nimport { analytics, keyboard } from '../shared/shared';\n\n// Temporary shortcut for testing out the dark theme.\nkeyboard.on('t', 'toggle theme', () => {\n  let nextTheme = 'dark';\n  const theme = document.documentElement.getAttribute('data-theme');\n  if (theme === 'dark') {\n    nextTheme = 'light';\n  }\n  document.documentElement.setAttribute('data-theme', nextTheme);\n  document.cookie = `prefers-color-scheme=${nextTheme};path=/;max-age=31536000;`;\n});\n\n// Pressing '/' focuses the search box\nkeyboard.on('/', 'focus search', e => {\n  const searchInput = Array.from(\n    document.querySelectorAll<HTMLInputElement>('.js-searchFocus')\n  ).pop();\n  // Favoring the Firefox quick find feature over search input\n  // focus. See: https://github.com/golang/go/issues/41093.\n  if (searchInput && !window.navigator.userAgent.includes('Firefox')) {\n    e.preventDefault();\n    searchInput.focus();\n  }\n});\n\n// Pressing 'y' changes the browser URL to the canonical URL\n// without triggering a reload.\nkeyboard.on('y', 'set canonical url', () => {\n  const canonicalURLPath = document.querySelector<HTMLDivElement>('.js-canonicalURLPath')?.dataset[\n    'canonicalUrlPath'\n  ];\n  if (canonicalURLPath && canonicalURLPath !== '') {\n    window.history.replaceState(null, '', canonicalURLPath);\n  }\n});\n\n/**\n * setupGoogleTagManager intializes Google Tag Manager.\n */\n(function setupGoogleTagManager() {\n  analytics.track({\n    'gtm.start': new Date().getTime(),\n    event: 'gtm.js',\n  });\n})();\n\n/**\n * removeUTMSource removes the utm_source GET parameter if present.\n * This is done using JavaScript, so that the utm_source is still\n * captured by Google Analytics.\n */\nfunction removeUTMSource() {\n  const urlParams = new URLSearchParams(window.location.search);\n  const utmSource = urlParams.get('utm_source');\n  if (utmSource !== 'gopls' && utmSource !== 'godoc' && utmSource !== 'pkggodev') {\n    return;\n  }\n\n  /** Strip the utm_source query parameter and replace the URL. **/\n  const newURL = new URL(window.location.href);\n  urlParams.delete('utm_source');\n  newURL.search = urlParams.toString();\n  window.history.replaceState(null, '', newURL.toString());\n}\n\nif (document.querySelector<HTMLElement>('.js-gtmID')?.dataset.gtmid && window.dataLayer) {\n  analytics.func(function () {\n    removeUTMSource();\n  });\n} else {\n  removeUTMSource();\n}\n"],
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+  "sourcesContent": ["// nb. This is for IE10 and lower _only_.\nvar supportCustomEvent = window.CustomEvent;\nif (!supportCustomEvent || typeof supportCustomEvent === 'object') {\n  supportCustomEvent = function CustomEvent(event, x) {\n    x = x || {};\n    var ev = document.createEvent('CustomEvent');\n    ev.initCustomEvent(event, !!x.bubbles, !!x.cancelable, x.detail || null);\n    return ev;\n  };\n  supportCustomEvent.prototype = window.Event.prototype;\n}\n\n/**\n * @param {Element} el to check for stacking context\n * @return {boolean} whether this el or its parents creates a stacking context\n */\nfunction createsStackingContext(el) {\n  while (el && el !== document.body) {\n    var s = window.getComputedStyle(el);\n    var invalid = function(k, ok) {\n      return !(s[k] === undefined || s[k] === ok);\n    };\n\n    if (s.opacity < 1 ||\n        invalid('zIndex', 'auto') ||\n        invalid('transform', 'none') ||\n        invalid('mixBlendMode', 'normal') ||\n        invalid('filter', 'none') ||\n        invalid('perspective', 'none') ||\n        s['isolation'] === 'isolate' ||\n        s.position === 'fixed' ||\n        s.webkitOverflowScrolling === 'touch') {\n      return true;\n    }\n    el = el.parentElement;\n  }\n  return false;\n}\n\n/**\n * Finds the nearest <dialog> from the passed element.\n *\n * @param {Element} el to search from\n * @return {HTMLDialogElement} dialog found\n */\nfunction findNearestDialog(el) {\n  while (el) {\n    if (el.localName === 'dialog') {\n      return /** @type {HTMLDialogElement} */ (el);\n    }\n    el = el.parentElement;\n  }\n  return null;\n}\n\n/**\n * Blur the specified element, as long as it's not the HTML body element.\n * This works around an IE9/10 bug - blurring the body causes Windows to\n * blur the whole application.\n *\n * @param {Element} el to blur\n */\nfunction safeBlur(el) {\n  if (el && el.blur && el !== document.body) {\n    el.blur();\n  }\n}\n\n/**\n * @param {!NodeList} nodeList to search\n * @param {Node} node to find\n * @return {boolean} whether node is inside nodeList\n */\nfunction inNodeList(nodeList, node) {\n  for (var i = 0; i < nodeList.length; ++i) {\n    if (nodeList[i] === node) {\n      return true;\n    }\n  }\n  return false;\n}\n\n/**\n * @param {HTMLFormElement} el to check\n * @return {boolean} whether this form has method=\"dialog\"\n */\nfunction isFormMethodDialog(el) {\n  if (!el || !el.hasAttribute('method')) {\n    return false;\n  }\n  return el.getAttribute('method').toLowerCase() === 'dialog';\n}\n\n/**\n * @param {!HTMLDialogElement} dialog to upgrade\n * @constructor\n */\nfunction dialogPolyfillInfo(dialog) {\n  this.dialog_ = dialog;\n  this.replacedStyleTop_ = false;\n  this.openAsModal_ = false;\n\n  // Set a11y role. Browsers that support dialog implicitly know this already.\n  if (!dialog.hasAttribute('role')) {\n    dialog.setAttribute('role', 'dialog');\n  }\n\n  dialog.show = this.show.bind(this);\n  dialog.showModal = this.showModal.bind(this);\n  dialog.close = this.close.bind(this);\n\n  if (!('returnValue' in dialog)) {\n    dialog.returnValue = '';\n  }\n\n  if ('MutationObserver' in window) {\n    var mo = new MutationObserver(this.maybeHideModal.bind(this));\n    mo.observe(dialog, {attributes: true, attributeFilter: ['open']});\n  } else {\n    // IE10 and below support. Note that DOMNodeRemoved etc fire _before_ removal. They also\n    // seem to fire even if the element was removed as part of a parent removal. Use the removed\n    // events to force downgrade (useful if removed/immediately added).\n    var removed = false;\n    var cb = function() {\n      removed ? this.downgradeModal() : this.maybeHideModal();\n      removed = false;\n    }.bind(this);\n    var timeout;\n    var delayModel = function(ev) {\n      if (ev.target !== dialog) { return; }  // not for a child element\n      var cand = 'DOMNodeRemoved';\n      removed |= (ev.type.substr(0, cand.length) === cand);\n      window.clearTimeout(timeout);\n      timeout = window.setTimeout(cb, 0);\n    };\n    ['DOMAttrModified', 'DOMNodeRemoved', 'DOMNodeRemovedFromDocument'].forEach(function(name) {\n      dialog.addEventListener(name, delayModel);\n    });\n  }\n  // Note that the DOM is observed inside DialogManager while any dialog\n  // is being displayed as a modal, to catch modal removal from the DOM.\n\n  Object.defineProperty(dialog, 'open', {\n    set: this.setOpen.bind(this),\n    get: dialog.hasAttribute.bind(dialog, 'open')\n  });\n\n  this.backdrop_ = document.createElement('div');\n  this.backdrop_.className = 'backdrop';\n  this.backdrop_.addEventListener('click', this.backdropClick_.bind(this));\n}\n\ndialogPolyfillInfo.prototype = {\n\n  get dialog() {\n    return this.dialog_;\n  },\n\n  /**\n   * Maybe remove this dialog from the modal top layer. This is called when\n   * a modal dialog may no longer be tenable, e.g., when the dialog is no\n   * longer open or is no longer part of the DOM.\n   */\n  maybeHideModal: function() {\n    if (this.dialog_.hasAttribute('open') && document.body.contains(this.dialog_)) { return; }\n    this.downgradeModal();\n  },\n\n  /**\n   * Remove this dialog from the modal top layer, leaving it as a non-modal.\n   */\n  downgradeModal: function() {\n    if (!this.openAsModal_) { return; }\n    this.openAsModal_ = false;\n    this.dialog_.style.zIndex = '';\n\n    // This won't match the native <dialog> exactly because if the user set top on a centered\n    // polyfill dialog, that top gets thrown away when the dialog is closed. Not sure it's\n    // possible to polyfill this perfectly.\n    if (this.replacedStyleTop_) {\n      this.dialog_.style.top = '';\n      this.replacedStyleTop_ = false;\n    }\n\n    // Clear the backdrop and remove from the manager.\n    this.backdrop_.parentNode && this.backdrop_.parentNode.removeChild(this.backdrop_);\n    dialogPolyfill.dm.removeDialog(this);\n  },\n\n  /**\n   * @param {boolean} value whether to open or close this dialog\n   */\n  setOpen: function(value) {\n    if (value) {\n      this.dialog_.hasAttribute('open') || this.dialog_.setAttribute('open', '');\n    } else {\n      this.dialog_.removeAttribute('open');\n      this.maybeHideModal();  // nb. redundant with MutationObserver\n    }\n  },\n\n  /**\n   * Handles clicks on the fake .backdrop element, redirecting them as if\n   * they were on the dialog itself.\n   *\n   * @param {!Event} e to redirect\n   */\n  backdropClick_: function(e) {\n    if (!this.dialog_.hasAttribute('tabindex')) {\n      // Clicking on the backdrop should move the implicit cursor, even if dialog cannot be\n      // focused. Create a fake thing to focus on. If the backdrop was _before_ the dialog, this\n      // would not be needed - clicks would move the implicit cursor there.\n      var fake = document.createElement('div');\n      this.dialog_.insertBefore(fake, this.dialog_.firstChild);\n      fake.tabIndex = -1;\n      fake.focus();\n      this.dialog_.removeChild(fake);\n    } else {\n      this.dialog_.focus();\n    }\n\n    var redirectedEvent = document.createEvent('MouseEvents');\n    redirectedEvent.initMouseEvent(e.type, e.bubbles, e.cancelable, window,\n        e.detail, e.screenX, e.screenY, e.clientX, e.clientY, e.ctrlKey,\n        e.altKey, e.shiftKey, e.metaKey, e.button, e.relatedTarget);\n    this.dialog_.dispatchEvent(redirectedEvent);\n    e.stopPropagation();\n  },\n\n  /**\n   * Focuses on the first focusable element within the dialog. This will always blur the current\n   * focus, even if nothing within the dialog is found.\n   */\n  focus_: function() {\n    // Find element with `autofocus` attribute, or fall back to the first form/tabindex control.\n    var target = this.dialog_.querySelector('[autofocus]:not([disabled])');\n    if (!target && this.dialog_.tabIndex >= 0) {\n      target = this.dialog_;\n    }\n    if (!target) {\n      // Note that this is 'any focusable area'. This list is probably not exhaustive, but the\n      // alternative involves stepping through and trying to focus everything.\n      var opts = ['button', 'input', 'keygen', 'select', 'textarea'];\n      var query = opts.map(function(el) {\n        return el + ':not([disabled])';\n      });\n      // TODO(samthor): tabindex values that are not numeric are not focusable.\n      query.push('[tabindex]:not([disabled]):not([tabindex=\"\"])');  // tabindex != \"\", not disabled\n      target = this.dialog_.querySelector(query.join(', '));\n    }\n    safeBlur(document.activeElement);\n    target && target.focus();\n  },\n\n  /**\n   * Sets the zIndex for the backdrop and dialog.\n   *\n   * @param {number} dialogZ\n   * @param {number} backdropZ\n   */\n  updateZIndex: function(dialogZ, backdropZ) {\n    if (dialogZ < backdropZ) {\n      throw new Error('dialogZ should never be < backdropZ');\n    }\n    this.dialog_.style.zIndex = dialogZ;\n    this.backdrop_.style.zIndex = backdropZ;\n  },\n\n  /**\n   * Shows the dialog. If the dialog is already open, this does nothing.\n   */\n  show: function() {\n    if (!this.dialog_.open) {\n      this.setOpen(true);\n      this.focus_();\n    }\n  },\n\n  /**\n   * Show this dialog modally.\n   */\n  showModal: function() {\n    if (this.dialog_.hasAttribute('open')) {\n      throw new Error('Failed to execute \\'showModal\\' on dialog: The element is already open, and therefore cannot be opened modally.');\n    }\n    if (!document.body.contains(this.dialog_)) {\n      throw new Error('Failed to execute \\'showModal\\' on dialog: The element is not in a Document.');\n    }\n    if (!dialogPolyfill.dm.pushDialog(this)) {\n      throw new Error('Failed to execute \\'showModal\\' on dialog: There are too many open modal dialogs.');\n    }\n\n    if (createsStackingContext(this.dialog_.parentElement)) {\n      console.warn('A dialog is being shown inside a stacking context. ' +\n          'This may cause it to be unusable. For more information, see this link: ' +\n          'https://github.com/GoogleChrome/dialog-polyfill/#stacking-context');\n    }\n\n    this.setOpen(true);\n    this.openAsModal_ = true;\n\n    // Optionally center vertically, relative to the current viewport.\n    if (dialogPolyfill.needsCentering(this.dialog_)) {\n      dialogPolyfill.reposition(this.dialog_);\n      this.replacedStyleTop_ = true;\n    } else {\n      this.replacedStyleTop_ = false;\n    }\n\n    // Insert backdrop.\n    this.dialog_.parentNode.insertBefore(this.backdrop_, this.dialog_.nextSibling);\n\n    // Focus on whatever inside the dialog.\n    this.focus_();\n  },\n\n  /**\n   * Closes this HTMLDialogElement. This is optional vs clearing the open\n   * attribute, however this fires a 'close' event.\n   *\n   * @param {string=} opt_returnValue to use as the returnValue\n   */\n  close: function(opt_returnValue) {\n    if (!this.dialog_.hasAttribute('open')) {\n      throw new Error('Failed to execute \\'close\\' on dialog: The element does not have an \\'open\\' attribute, and therefore cannot be closed.');\n    }\n    this.setOpen(false);\n\n    // Leave returnValue untouched in case it was set directly on the element\n    if (opt_returnValue !== undefined) {\n      this.dialog_.returnValue = opt_returnValue;\n    }\n\n    // Triggering \"close\" event for any attached listeners on the <dialog>.\n    var closeEvent = new supportCustomEvent('close', {\n      bubbles: false,\n      cancelable: false\n    });\n    this.dialog_.dispatchEvent(closeEvent);\n  }\n\n};\n\nvar dialogPolyfill = {};\n\ndialogPolyfill.reposition = function(element) {\n  var scrollTop = document.body.scrollTop || document.documentElement.scrollTop;\n  var topValue = scrollTop + (window.innerHeight - element.offsetHeight) / 2;\n  element.style.top = Math.max(scrollTop, topValue) + 'px';\n};\n\ndialogPolyfill.isInlinePositionSetByStylesheet = function(element) {\n  for (var i = 0; i < document.styleSheets.length; ++i) {\n    var styleSheet = document.styleSheets[i];\n    var cssRules = null;\n    // Some browsers throw on cssRules.\n    try {\n      cssRules = styleSheet.cssRules;\n    } catch (e) {}\n    if (!cssRules) { continue; }\n    for (var j = 0; j < cssRules.length; ++j) {\n      var rule = cssRules[j];\n      var selectedNodes = null;\n      // Ignore errors on invalid selector texts.\n      try {\n        selectedNodes = document.querySelectorAll(rule.selectorText);\n      } catch(e) {}\n      if (!selectedNodes || !inNodeList(selectedNodes, element)) {\n        continue;\n      }\n      var cssTop = rule.style.getPropertyValue('top');\n      var cssBottom = rule.style.getPropertyValue('bottom');\n      if ((cssTop && cssTop !== 'auto') || (cssBottom && cssBottom !== 'auto')) {\n        return true;\n      }\n    }\n  }\n  return false;\n};\n\ndialogPolyfill.needsCentering = function(dialog) {\n  var computedStyle = window.getComputedStyle(dialog);\n  if (computedStyle.position !== 'absolute') {\n    return false;\n  }\n\n  // We must determine whether the top/bottom specified value is non-auto.  In\n  // WebKit/Blink, checking computedStyle.top == 'auto' is sufficient, but\n  // Firefox returns the used value. So we do this crazy thing instead: check\n  // the inline style and then go through CSS rules.\n  if ((dialog.style.top !== 'auto' && dialog.style.top !== '') ||\n      (dialog.style.bottom !== 'auto' && dialog.style.bottom !== '')) {\n    return false;\n  }\n  return !dialogPolyfill.isInlinePositionSetByStylesheet(dialog);\n};\n\n/**\n * @param {!Element} element to force upgrade\n */\ndialogPolyfill.forceRegisterDialog = function(element) {\n  if (window.HTMLDialogElement || element.showModal) {\n    console.warn('This browser already supports <dialog>, the polyfill ' +\n        'may not work correctly', element);\n  }\n  if (element.localName !== 'dialog') {\n    throw new Error('Failed to register dialog: The element is not a dialog.');\n  }\n  new dialogPolyfillInfo(/** @type {!HTMLDialogElement} */ (element));\n};\n\n/**\n * @param {!Element} element to upgrade, if necessary\n */\ndialogPolyfill.registerDialog = function(element) {\n  if (!element.showModal) {\n    dialogPolyfill.forceRegisterDialog(element);\n  }\n};\n\n/**\n * @constructor\n */\ndialogPolyfill.DialogManager = function() {\n  /** @type {!Array<!dialogPolyfillInfo>} */\n  this.pendingDialogStack = [];\n\n  var checkDOM = this.checkDOM_.bind(this);\n\n  // The overlay is used to simulate how a modal dialog blocks the document.\n  // The blocking dialog is positioned on top of the overlay, and the rest of\n  // the dialogs on the pending dialog stack are positioned below it. In the\n  // actual implementation, the modal dialog stacking is controlled by the\n  // top layer, where z-index has no effect.\n  this.overlay = document.createElement('div');\n  this.overlay.className = '_dialog_overlay';\n  this.overlay.addEventListener('click', function(e) {\n    this.forwardTab_ = undefined;\n    e.stopPropagation();\n    checkDOM([]);  // sanity-check DOM\n  }.bind(this));\n\n  this.handleKey_ = this.handleKey_.bind(this);\n  this.handleFocus_ = this.handleFocus_.bind(this);\n\n  this.zIndexLow_ = 100000;\n  this.zIndexHigh_ = 100000 + 150;\n\n  this.forwardTab_ = undefined;\n\n  if ('MutationObserver' in window) {\n    this.mo_ = new MutationObserver(function(records) {\n      var removed = [];\n      records.forEach(function(rec) {\n        for (var i = 0, c; c = rec.removedNodes[i]; ++i) {\n          if (!(c instanceof Element)) {\n            continue;\n          } else if (c.localName === 'dialog') {\n            removed.push(c);\n          }\n          removed = removed.concat(c.querySelectorAll('dialog'));\n        }\n      });\n      removed.length && checkDOM(removed);\n    });\n  }\n};\n\n/**\n * Called on the first modal dialog being shown. Adds the overlay and related\n * handlers.\n */\ndialogPolyfill.DialogManager.prototype.blockDocument = function() {\n  document.documentElement.addEventListener('focus', this.handleFocus_, true);\n  document.addEventListener('keydown', this.handleKey_);\n  this.mo_ && this.mo_.observe(document, {childList: true, subtree: true});\n};\n\n/**\n * Called on the first modal dialog being removed, i.e., when no more modal\n * dialogs are visible.\n */\ndialogPolyfill.DialogManager.prototype.unblockDocument = function() {\n  document.documentElement.removeEventListener('focus', this.handleFocus_, true);\n  document.removeEventListener('keydown', this.handleKey_);\n  this.mo_ && this.mo_.disconnect();\n};\n\n/**\n * Updates the stacking of all known dialogs.\n */\ndialogPolyfill.DialogManager.prototype.updateStacking = function() {\n  var zIndex = this.zIndexHigh_;\n\n  for (var i = 0, dpi; dpi = this.pendingDialogStack[i]; ++i) {\n    dpi.updateZIndex(--zIndex, --zIndex);\n    if (i === 0) {\n      this.overlay.style.zIndex = --zIndex;\n    }\n  }\n\n  // Make the overlay a sibling of the dialog itself.\n  var last = this.pendingDialogStack[0];\n  if (last) {\n    var p = last.dialog.parentNode || document.body;\n    p.appendChild(this.overlay);\n  } else if (this.overlay.parentNode) {\n    this.overlay.parentNode.removeChild(this.overlay);\n  }\n};\n\n/**\n * @param {Element} candidate to check if contained or is the top-most modal dialog\n * @return {boolean} whether candidate is contained in top dialog\n */\ndialogPolyfill.DialogManager.prototype.containedByTopDialog_ = function(candidate) {\n  while (candidate = findNearestDialog(candidate)) {\n    for (var i = 0, dpi; dpi = this.pendingDialogStack[i]; ++i) {\n      if (dpi.dialog === candidate) {\n        return i === 0;  // only valid if top-most\n      }\n    }\n    candidate = candidate.parentElement;\n  }\n  return false;\n};\n\ndialogPolyfill.DialogManager.prototype.handleFocus_ = function(event) {\n  if (this.containedByTopDialog_(event.target)) { return; }\n\n  if (document.activeElement === document.documentElement) { return; }\n\n  event.preventDefault();\n  event.stopPropagation();\n  safeBlur(/** @type {Element} */ (event.target));\n\n  if (this.forwardTab_ === undefined) { return; }  // move focus only from a tab key\n\n  var dpi = this.pendingDialogStack[0];\n  var dialog = dpi.dialog;\n  var position = dialog.compareDocumentPosition(event.target);\n  if (position & Node.DOCUMENT_POSITION_PRECEDING) {\n    if (this.forwardTab_) {\n      // forward\n      dpi.focus_();\n    } else if (event.target !== document.documentElement) {\n      // backwards if we're not already focused on <html>\n      document.documentElement.focus();\n    }\n  }\n\n  return false;\n};\n\ndialogPolyfill.DialogManager.prototype.handleKey_ = function(event) {\n  this.forwardTab_ = undefined;\n  if (event.keyCode === 27) {\n    event.preventDefault();\n    event.stopPropagation();\n    var cancelEvent = new supportCustomEvent('cancel', {\n      bubbles: false,\n      cancelable: true\n    });\n    var dpi = this.pendingDialogStack[0];\n    if (dpi && dpi.dialog.dispatchEvent(cancelEvent)) {\n      dpi.dialog.close();\n    }\n  } else if (event.keyCode === 9) {\n    this.forwardTab_ = !event.shiftKey;\n  }\n};\n\n/**\n * Finds and downgrades any known modal dialogs that are no longer displayed. Dialogs that are\n * removed and immediately readded don't stay modal, they become normal.\n *\n * @param {!Array<!HTMLDialogElement>} removed that have definitely been removed\n */\ndialogPolyfill.DialogManager.prototype.checkDOM_ = function(removed) {\n  // This operates on a clone because it may cause it to change. Each change also calls\n  // updateStacking, which only actually needs to happen once. But who removes many modal dialogs\n  // at a time?!\n  var clone = this.pendingDialogStack.slice();\n  clone.forEach(function(dpi) {\n    if (removed.indexOf(dpi.dialog) !== -1) {\n      dpi.downgradeModal();\n    } else {\n      dpi.maybeHideModal();\n    }\n  });\n};\n\n/**\n * @param {!dialogPolyfillInfo} dpi\n * @return {boolean} whether the dialog was allowed\n */\ndialogPolyfill.DialogManager.prototype.pushDialog = function(dpi) {\n  var allowed = (this.zIndexHigh_ - this.zIndexLow_) / 2 - 1;\n  if (this.pendingDialogStack.length >= allowed) {\n    return false;\n  }\n  if (this.pendingDialogStack.unshift(dpi) === 1) {\n    this.blockDocument();\n  }\n  this.updateStacking();\n  return true;\n};\n\n/**\n * @param {!dialogPolyfillInfo} dpi\n */\ndialogPolyfill.DialogManager.prototype.removeDialog = function(dpi) {\n  var index = this.pendingDialogStack.indexOf(dpi);\n  if (index === -1) { return; }\n\n  this.pendingDialogStack.splice(index, 1);\n  if (this.pendingDialogStack.length === 0) {\n    this.unblockDocument();\n  }\n  this.updateStacking();\n};\n\ndialogPolyfill.dm = new dialogPolyfill.DialogManager();\ndialogPolyfill.formSubmitter = null;\ndialogPolyfill.useValue = null;\n\n/**\n * Installs global handlers, such as click listers and native method overrides. These are needed\n * even if a no dialog is registered, as they deal with <form method=\"dialog\">.\n */\nif (window.HTMLDialogElement === undefined) {\n\n  /**\n   * If HTMLFormElement translates method=\"DIALOG\" into 'get', then replace the descriptor with\n   * one that returns the correct value.\n   */\n  var testForm = document.createElement('form');\n  testForm.setAttribute('method', 'dialog');\n  if (testForm.method !== 'dialog') {\n    var methodDescriptor = Object.getOwnPropertyDescriptor(HTMLFormElement.prototype, 'method');\n    if (methodDescriptor) {\n      // nb. Some older iOS and older PhantomJS fail to return the descriptor. Don't do anything\n      // and don't bother to update the element.\n      var realGet = methodDescriptor.get;\n      methodDescriptor.get = function() {\n        if (isFormMethodDialog(this)) {\n          return 'dialog';\n        }\n        return realGet.call(this);\n      };\n      var realSet = methodDescriptor.set;\n      methodDescriptor.set = function(v) {\n        if (typeof v === 'string' && v.toLowerCase() === 'dialog') {\n          return this.setAttribute('method', v);\n        }\n        return realSet.call(this, v);\n      };\n      Object.defineProperty(HTMLFormElement.prototype, 'method', methodDescriptor);\n    }\n  }\n\n  /**\n   * Global 'click' handler, to capture the <input type=\"submit\"> or <button> element which has\n   * submitted a <form method=\"dialog\">. Needed as Safari and others don't report this inside\n   * document.activeElement.\n   */\n  document.addEventListener('click', function(ev) {\n    dialogPolyfill.formSubmitter = null;\n    dialogPolyfill.useValue = null;\n    if (ev.defaultPrevented) { return; }  // e.g. a submit which prevents default submission\n\n    var target = /** @type {Element} */ (ev.target);\n    if (!target || !isFormMethodDialog(target.form)) { return; }\n\n    var valid = (target.type === 'submit' && ['button', 'input'].indexOf(target.localName) > -1);\n    if (!valid) {\n      if (!(target.localName === 'input' && target.type === 'image')) { return; }\n      // this is a <input type=\"image\">, which can submit forms\n      dialogPolyfill.useValue = ev.offsetX + ',' + ev.offsetY;\n    }\n\n    var dialog = findNearestDialog(target);\n    if (!dialog) { return; }\n\n    dialogPolyfill.formSubmitter = target;\n\n  }, false);\n\n  /**\n   * Replace the native HTMLFormElement.submit() method, as it won't fire the\n   * submit event and give us a chance to respond.\n   */\n  var nativeFormSubmit = HTMLFormElement.prototype.submit;\n  var replacementFormSubmit = function () {\n    if (!isFormMethodDialog(this)) {\n      return nativeFormSubmit.call(this);\n    }\n    var dialog = findNearestDialog(this);\n    dialog && dialog.close();\n  };\n  HTMLFormElement.prototype.submit = replacementFormSubmit;\n\n  /**\n   * Global form 'dialog' method handler. Closes a dialog correctly on submit\n   * and possibly sets its return value.\n   */\n  document.addEventListener('submit', function(ev) {\n    if (ev.defaultPrevented) { return; }  // e.g. a submit which prevents default submission\n\n    var form = /** @type {HTMLFormElement} */ (ev.target);\n    if (!isFormMethodDialog(form)) { return; }\n    ev.preventDefault();\n\n    var dialog = findNearestDialog(form);\n    if (!dialog) { return; }\n\n    // Forms can only be submitted via .submit() or a click (?), but anyway: sanity-check that\n    // the submitter is correct before using its value as .returnValue.\n    var s = dialogPolyfill.formSubmitter;\n    if (s && s.form === form) {\n      dialog.close(dialogPolyfill.useValue || s.value);\n    } else {\n      dialog.close();\n    }\n    dialogPolyfill.formSubmitter = null;\n\n  }, false);\n}\n\nexport default dialogPolyfill;\n", "function registerHeaderListeners() {\n  const header = document.querySelector('.js-header');\n  const menuButtons = document.querySelectorAll('.js-headerMenuButton');\n  menuButtons.forEach(button => {\n    button.addEventListener('click', e => {\n      e.preventDefault();\n      header?.classList.toggle('is-active');\n      button.setAttribute('aria-expanded', String(header?.classList.contains('is-active')));\n    });\n  });\n\n  const scrim = document.querySelector('.js-scrim');\n  scrim?.addEventListener('click', e => {\n    e.preventDefault();\n    header?.classList.remove('is-active');\n    menuButtons.forEach(button => {\n      button.setAttribute('aria-expanded', String(header?.classList.contains('is-active')));\n    });\n  });\n}\n\nfunction registerSearchFormListeners() {\n  const searchForm = document.querySelector('.js-searchForm');\n  const expandSearch = document.querySelector('.js-expandSearch');\n  const input = searchForm?.querySelector('input');\n  const headerLogo = document.querySelector('.js-headerLogo');\n  const menuButton = document.querySelector('.js-headerMenuButton');\n  expandSearch?.addEventListener('click', () => {\n    searchForm?.classList.add('go-SearchForm--expanded');\n    headerLogo?.classList.add('go-Header-logo--hidden');\n    menuButton?.classList.add('go-Header-navOpen--hidden');\n    input?.focus();\n  });\n  document?.addEventListener('click', e => {\n    if (!searchForm?.contains(e.target as Node)) {\n      searchForm?.classList.remove('go-SearchForm--expanded');\n      headerLogo?.classList.remove('go-Header-logo--hidden');\n      menuButton?.classList.remove('go-Header-navOpen--hidden');\n    }\n  });\n}\n\n/**\n * Listen for changes in the search dropdown.\n *\n * TODO(https://golang.org/issue/44142): Fix this flow:\n * A user will likely expect to submit the search again after selecting the\n * type of search. The change event should trigger a form submission, so that the\n * search event is still captured in analytics without a manual instrumentation.\n */\ndocument.querySelectorAll('.js-searchModeSelect').forEach(el => {\n  el.addEventListener('change', e => {\n    const urlSearchParams = new URLSearchParams(window.location.search);\n    const params = Object.fromEntries(urlSearchParams.entries());\n    const query = params['q'];\n    if (query) {\n      window.location.search = `q=${query}&m=${(e.target as HTMLSelectElement).value}`;\n    }\n  });\n});\n\nregisterHeaderListeners();\nregisterSearchFormListeners();\n", "/**\n * @license\n * Copyright 2021 The Go Authors. All rights reserved.\n * Use of this source code is governed by a BSD-style\n * license that can be found in the LICENSE file.\n */\n\n/**\n * This class decorates an element to copy arbitrary data attached via a data-\n * attribute to the clipboard.\n */\nexport class ClipboardController {\n  /**\n   * The data to be copied to the clipboard.\n   */\n  private data: string;\n\n  /**\n   * @param el The element that will trigger copying text to the clipboard. The text is\n   * expected to be within its data-to-copy attribute.\n   */\n  constructor(private el: HTMLButtonElement) {\n    this.data = el.dataset['toCopy'] ?? el.innerText;\n    // if data-to-copy is empty and the button is part of an input group\n    // capture the value of the input.\n    if (!this.data && el.parentElement?.classList.contains('go-InputGroup')) {\n      this.data = (this.data || el.parentElement?.querySelector('input')?.value) ?? '';\n    }\n    el.addEventListener('click', e => this.handleCopyClick(e));\n  }\n\n  /**\n   * Handles when the primary element is clicked.\n   */\n  handleCopyClick(e: MouseEvent): void {\n    e.preventDefault();\n    const TOOLTIP_SHOW_DURATION_MS = 1000;\n\n    // This API is not available on iOS.\n    if (!navigator.clipboard) {\n      this.showTooltipText('Unable to copy', TOOLTIP_SHOW_DURATION_MS);\n      return;\n    }\n    navigator.clipboard\n      .writeText(this.data)\n      .then(() => {\n        this.showTooltipText('Copied!', TOOLTIP_SHOW_DURATION_MS);\n      })\n      .catch(() => {\n        this.showTooltipText('Unable to copy', TOOLTIP_SHOW_DURATION_MS);\n      });\n  }\n\n  /**\n   * Shows the given text in a tooltip for a specified amount of time, in milliseconds.\n   */\n  showTooltipText(text: string, durationMs: number): void {\n    this.el.setAttribute('data-tooltip', text);\n    setTimeout(() => this.el.setAttribute('data-tooltip', ''), durationMs);\n  }\n}\n", "/**\n * @license\n * Copyright 2021 The Go Authors. All rights reserved.\n * Use of this source code is governed by a BSD-style\n * license that can be found in the LICENSE file.\n */\n\n/**\n * ToolTipController handles closing tooltips on external clicks.\n */\nexport class ToolTipController {\n  constructor(private el: HTMLDetailsElement) {\n    document.addEventListener('click', e => {\n      const insideTooltip = this.el.contains(e.target as Element);\n      if (!insideTooltip) {\n        this.el.removeAttribute('open');\n      }\n    });\n  }\n}\n", "/**\n * @license\n * Copyright 2021 The Go Authors. All rights reserved.\n * Use of this source code is governed by a BSD-style\n * license that can be found in the LICENSE file.\n */\n\nimport { TreeNavController } from './tree.js';\n\nexport class SelectNavController {\n  constructor(private el: Element) {\n    this.el.addEventListener('change', e => {\n      const target = e.target as HTMLSelectElement;\n      let href = target.value;\n      if (!target.value.startsWith('/')) {\n        href = '/' + href;\n      }\n      window.location.href = href;\n    });\n  }\n}\n\nexport function makeSelectNav(tree: TreeNavController): HTMLLabelElement {\n  const label = document.createElement('label');\n  label.classList.add('go-Label');\n  label.setAttribute('aria-label', 'Menu');\n  const select = document.createElement('select');\n  select.classList.add('go-Select', 'js-selectNav');\n  label.appendChild(select);\n  const outline = document.createElement('optgroup');\n  outline.label = 'Outline';\n  select.appendChild(outline);\n  const groupMap: Record<string, HTMLOptGroupElement> = {};\n  let group: HTMLOptGroupElement;\n  for (const t of tree.treeitems) {\n    if (Number(t.depth) > 4) continue;\n    if (t.groupTreeitem) {\n      group = groupMap[t.groupTreeitem.label];\n      if (!group) {\n        group = groupMap[t.groupTreeitem.label] = document.createElement('optgroup');\n        group.label = t.groupTreeitem.label;\n        select.appendChild(group);\n      }\n    } else {\n      group = outline;\n    }\n    const o = document.createElement('option');\n    o.label = t.label;\n    o.textContent = t.label;\n    o.value = (t.el as HTMLAnchorElement).href.replace(window.location.origin, '').replace('/', '');\n    group.appendChild(o);\n  }\n  tree.addObserver(t => {\n    const value = select.querySelector<HTMLOptionElement>(`[label=\"${t.label}\"]`)?.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 * ModalController registers a dialog element with the polyfill if\n * necessary for the current browser, add adds event listeners to\n * close and open modals.\n */\nexport class ModalController {\n  constructor(private el: HTMLDialogElement) {\n    // Only load the dialog polyfill if necessary for the environment.\n    if (!window.HTMLDialogElement && !el.showModal) {\n      import('../../../third_party/dialog-polyfill/dialog-polyfill.esm.js').then(\n        ({ default: polyfill }) => {\n          polyfill.registerDialog(el);\n        }\n      );\n    }\n    const id = el.id;\n    const button = document.querySelector<HTMLButtonElement>(`[aria-controls=\"${id}\"]`);\n    if (button) {\n      button.addEventListener('click', () => {\n        if (this.el.showModal) {\n          this.el.showModal();\n        } else {\n          this.el.open = true;\n        }\n        el.querySelector('input')?.focus();\n      });\n    }\n    for (const close of this.el.querySelectorAll<HTMLButtonElement>('[data-modal-close]')) {\n      close.addEventListener('click', () => {\n        if (this.el.close) {\n          this.el.close();\n        } else {\n          this.el.open = false;\n        }\n      });\n    }\n  }\n}\n", "interface TagManagerEvent {\n  /**\n   * event is the name of the event, used to filter events in\n   * Google Analytics.\n   */\n  event: string;\n\n  /**\n   * event_category is a name that you supply as a way to group objects\n   * that to analyze. Typically, you will use the same category name\n   * multiple times over related UI elements (buttons, links, etc).\n   */\n  event_category?: string;\n\n  /**\n   * event_action is used to name the type of event or interaction you\n   * want to measure for a particular web object. For example, with a\n   * single \"form\" category, you can analyze a number of specific events\n   * with this parameter, such as: form entered, form submitted.\n   */\n  event_action?: string;\n\n  /**\n   * event_label provide additional information for events that you want\n   * to analyze, such as the text label of a link.\n   */\n  event_label?: string;\n\n  /**\n   * gtm.start is used to initialize Google Tag Manager.\n   */\n  'gtm.start'?: number;\n}\n\n// eslint-disable-next-line @typescript-eslint/no-unused-vars\ndeclare global {\n  interface Window {\n    dataLayer?: (TagManagerEvent | VoidFunction)[];\n    ga?: unknown;\n  }\n}\n\n/**\n * track sends events to Google Tag Manager.\n */\nexport function track(\n  event: string | TagManagerEvent,\n  category?: string,\n  action?: string,\n  label?: string\n): void {\n  window.dataLayer ??= [];\n  if (typeof event === 'string') {\n    window.dataLayer.push({\n      event,\n      event_category: category,\n      event_action: action,\n      event_label: label,\n    });\n  } else {\n    window.dataLayer.push(event);\n  }\n}\n\n/**\n * func adds functions to run sequentionally after\n * Google Tag Manager is ready.\n */\nexport function func(fn: () => void): void {\n  window.dataLayer ??= [];\n  window.dataLayer.push(fn);\n}\n", "/*!\n * @license\n * Copyright 2019-2020 The Go Authors. All rights reserved.\n * Use of this source code is governed by a BSD-style\n * license that can be found in the LICENSE file.\n */\n\nimport { track } from '../analytics/analytics';\n\n/**\n * Options are keyhandler callback options.\n */\ninterface Options {\n  /**\n   * target is the element the key event should filter on. The\n   * default target is the document.\n   */\n  target?: Element;\n\n  /**\n   * withMeta specifies if the event callback should fire when\n   * the key is pressed with a meta key (ctrl, alt, etc). By\n   * default meta keypresses are ignored.\n   */\n  withMeta?: boolean;\n}\n\n/**\n * KeyHandler is the config for a keyboard event callback.\n */\ninterface KeyHandler extends Options {\n  description: string;\n  callback: (e: KeyboardEvent) => void;\n}\n\n/**\n * KeyboardController controls event callbacks for sitewide\n * keyboard events. Multiple callbacks can be registered for\n * a single key and by default the controller ignores events\n * for text input targets.\n */\nclass KeyboardController {\n  handlers: Record<string, Set<KeyHandler>>;\n\n  constructor() {\n    this.handlers = {};\n    document.addEventListener('keydown', e => this.handleKeyPress(e));\n  }\n\n  /**\n   * on registers keyboard event callbacks.\n   * @param key the key to register.\n   * @param description name of the event.\n   * @param callback event callback.\n   * @param options set target and withMeta options to override the default behaviors.\n   */\n  on(key: string, description: string, callback: (e: KeyboardEvent) => void, options?: Options) {\n    this.handlers[key] ??= new Set();\n    this.handlers[key].add({ description, callback, ...options });\n    return this;\n  }\n\n  private handleKeyPress(e: KeyboardEvent) {\n    for (const handler of this.handlers[e.key] ?? new Set()) {\n      if (handler.target && handler.target !== e.target) {\n        return;\n      }\n      const t = e.target as HTMLElement | null;\n      if (\n        !handler.target &&\n        (t?.tagName === 'INPUT' || t?.tagName === 'SELECT' || t?.tagName === 'TEXTAREA')\n      ) {\n        return;\n      }\n      if (t?.isContentEditable) {\n        return;\n      }\n      if (\n        (handler.withMeta && !(e.ctrlKey || e.metaKey)) ||\n        (!handler.withMeta && (e.ctrlKey || e.metaKey))\n      ) {\n        return;\n      }\n      track('keypress', 'hotkeys', `${e.key} pressed`, handler.description);\n      handler.callback(e);\n    }\n  }\n}\n\nexport const keyboard = new KeyboardController();\n", "/**\n * @license\n * Copyright 2020 The Go Authors. All rights reserved.\n * Use of this source code is governed by a BSD-style\n * license that can be found in the LICENSE file.\n */\n\nimport './header/header';\nimport { ClipboardController } from './clipboard/clipboard';\nimport { ToolTipController } from './tooltip/tooltip';\nimport { SelectNavController } from './outline/select';\nimport { ModalController } from './modal/modal';\n\nexport { keyboard } from './keyboard/keyboard';\nexport * as analytics from './analytics/analytics';\n\nfor (const el of document.querySelectorAll<HTMLButtonElement>('.js-clipboard')) {\n  new ClipboardController(el);\n}\n\nfor (const el of document.querySelectorAll<HTMLDialogElement>('.js-modal')) {\n  new ModalController(el);\n}\n\nfor (const t of document.querySelectorAll<HTMLDetailsElement>('.js-tooltip')) {\n  new ToolTipController(t);\n}\n\nfor (const el of document.querySelectorAll<HTMLSelectElement>('.js-selectNav')) {\n  new SelectNavController(el);\n}\n", "/**\n * @license\n * Copyright 2020 The Go Authors. All rights reserved.\n * Use of this source code is governed by a BSD-style\n * license that can be found in the LICENSE file.\n */\n\nimport { analytics, keyboard } from '../shared/shared';\n\n// Temporary shortcut for testing out the dark theme.\nkeyboard.on('t', 'toggle theme', () => {\n  let nextTheme = 'dark';\n  const theme = document.documentElement.getAttribute('data-theme');\n  if (theme === 'dark') {\n    nextTheme = 'light';\n  }\n  document.documentElement.setAttribute('data-theme', nextTheme);\n  document.cookie = `prefers-color-scheme=${nextTheme};path=/;max-age=31536000;`;\n});\n\n// Pressing '/' focuses the search box\nkeyboard.on('/', 'focus search', e => {\n  const searchInput = Array.from(\n    document.querySelectorAll<HTMLInputElement>('.js-searchFocus')\n  ).pop();\n  // Favoring the Firefox quick find feature over search input\n  // focus. See: https://github.com/golang/go/issues/41093.\n  if (searchInput && !window.navigator.userAgent.includes('Firefox')) {\n    e.preventDefault();\n    searchInput.focus();\n  }\n});\n\n// Pressing 'y' changes the browser URL to the canonical URL\n// without triggering a reload.\nkeyboard.on('y', 'set canonical url', () => {\n  const canonicalURLPath = document.querySelector<HTMLDivElement>('.js-canonicalURLPath')?.dataset[\n    'canonicalUrlPath'\n  ];\n  if (canonicalURLPath && canonicalURLPath !== '') {\n    window.history.replaceState(null, '', canonicalURLPath);\n  }\n});\n\n/**\n * setupGoogleTagManager intializes Google Tag Manager.\n */\n(function setupGoogleTagManager() {\n  analytics.track({\n    'gtm.start': new Date().getTime(),\n    event: 'gtm.js',\n  });\n})();\n\n/**\n * removeUTMSource removes the utm_source GET parameter if present.\n * This is done using JavaScript, so that the utm_source is still\n * captured by Google Analytics.\n */\nfunction removeUTMSource() {\n  const urlParams = new URLSearchParams(window.location.search);\n  const utmSource = urlParams.get('utm_source');\n  if (utmSource !== 'gopls' && utmSource !== 'godoc' && utmSource !== 'pkggodev') {\n    return;\n  }\n\n  /** Strip the utm_source query parameter and replace the URL. **/\n  const newURL = new URL(window.location.href);\n  urlParams.delete('utm_source');\n  newURL.search = urlParams.toString();\n  window.history.replaceState(null, '', newURL.toString());\n}\n\nif (document.querySelector<HTMLElement>('.js-gtmID')?.dataset.gtmid && window.dataLayer) {\n  analytics.func(function () {\n    removeUTMSource();\n  });\n} else {\n  removeUTMSource();\n}\n"],
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   "names": []
 }
diff --git a/static/shared/header/header.css b/static/shared/header/header.css
index 5bd5b71..58d0da0 100644
--- a/static/shared/header/header.css
+++ b/static/shared/header/header.css
@@ -156,70 +156,31 @@
   margin-left: 1rem;
   width: 2.5rem;
 }
+.go-Header-navOpen--hidden {
+  display: none;
+}
 .go-Header-navOpen--white {
   background: no-repeat center/2rem url('/static/shared/icon/menu_gm_grey_24dp.svg');
   filter: brightness(0) saturate(100%) invert(100%) sepia(97%) saturate(13%) hue-rotate(245deg)
     brightness(103%) contrast(107%);
 }
 
-.go-SearchForm {
-  align-items: center;
-  background-color: transparent;
-  border-radius: 0.25rem;
+.go-SearchForm--expanded {
+  flex-grow: 1;
+}
+.go-SearchForm-form {
+  display: none;
+}
+.go-SearchForm--expanded .go-SearchForm-form {
   display: flex;
-  flex: 1;
-  font-size: 1rem;
-  height: 2rem;
-  margin: 0.6875rem 0;
-  max-width: 2rem;
-  transition: max-width 200ms;
 }
-.go-SearchForm--open {
-  background-color: var(--color-background);
-  margin-left: 1.5rem;
-  max-width: min(100%, 30rem);
+.go-SearchForm-expandSearch {
+  appearance: none;
+  background: none;
+  font-size: 1.5rem;
 }
-.go-SearchForm svg {
-  box-sizing: border-box;
-  cursor: pointer;
-  fill: var(--white);
-  margin-left: 0.5rem;
-  width: 1.4375rem;
-}
-.go-SearchForm--open svg {
-  fill: var(--color-text-subtle);
-  margin-right: 0.5rem;
-}
-.go-SearchForm-input {
-  background-color: transparent;
-  border: none;
-  box-sizing: border-box;
-  font: inherit;
-  height: 100%;
-  opacity: 0;
-  outline: none;
-  padding: 0;
-  transition: width 200ms, padding 200ms, opacity 200ms;
-  width: 0;
-}
-.go-SearchForm--open .go-SearchForm-input {
-  flex: 1;
-  opacity: 1;
-  padding: 0.5rem;
-  transition: width 200ms, padding 200ms;
-  width: 100%;
-}
-.go-SearchForm-input::placeholder {
-  color: var(--color-text-subtle);
-}
-.go-SearchForm-submit {
-  background-color: transparent;
-  border: none;
-  box-sizing: border-box;
-  cursor: pointer;
-  display: flex;
-  outline: 0;
-  padding: 0;
+.go-SearchForm--expanded .go-SearchForm-expandSearch {
+  display: none;
 }
 
 @media only screen and (min-width: 32rem) {
@@ -227,18 +188,16 @@
     width: 100%;
   }
   .go-SearchForm {
-    background-color: var(--color-background);
-    margin: 0.6rem 1.4rem 0.6rem 0;
-    max-width: none;
+    flex: 1;
   }
-  .go-SearchForm-input {
-    opacity: 1;
-    padding: initial;
-    width: 100%;
+  .go-SearchForm-form {
+    display: flex;
   }
-  .go-SearchForm svg {
-    fill: var(--color-text-subtle);
-    margin-right: 0.5rem;
+  .go-SearchForm-expandSearch {
+    display: none;
+  }
+  .go-Header-logo--hidden {
+    display: initial;
   }
 }
 
diff --git a/static/shared/header/header.js b/static/shared/header/header.js
index 305439a..9700d28 100644
--- a/static/shared/header/header.js
+++ b/static/shared/header/header.js
@@ -1,2 +1,2 @@
-function registerHeaderListeners(){const t=document.querySelector(".js-header"),r=document.querySelectorAll(".js-headerMenuButton");r.forEach(n=>{n.addEventListener("click",e=>{e.preventDefault(),t?.classList.toggle("is-active"),n.setAttribute("aria-expanded",String(t?.classList.contains("is-active")))})}),document.querySelector(".js-scrim")?.addEventListener("click",n=>{n.preventDefault(),t?.classList.remove("is-active"),r.forEach(e=>{e.setAttribute("aria-expanded",String(t?.classList.contains("is-active")))})})}function registerSearchFormListeners(){const t=512,r=document.querySelector(".js-headerLogo"),s=document.querySelector(".js-searchForm"),n=document.querySelector(".js-searchFormSubmit"),e=s?.querySelector("input");a(),window.addEventListener("resize",a);function a(){window.innerWidth>t?(r?.classList.remove("go-Header-logo--hidden"),s?.classList.remove("go-SearchForm--open"),e?.removeEventListener("focus",o),e?.removeEventListener("keypress",i),e?.removeEventListener("focusout",d)):(n?.addEventListener("click",l),e?.addEventListener("focus",o),e?.addEventListener("keypress",i),e?.addEventListener("focusout",d))}function i(c){c.key==="Enter"&&s?.submit()}function o(){r?.classList.add("go-Header-logo--hidden"),s?.classList.add("go-SearchForm--open")}function d(){r?.classList.remove("go-Header-logo--hidden"),s?.classList.remove("go-SearchForm--open")}function l(c){c.preventDefault(),o(),e?.focus()}}document.querySelectorAll(".js-searchModeSelect").forEach(t=>{t.addEventListener("change",r=>{const s=new URLSearchParams(window.location.search),e=Object.fromEntries(s.entries()).q;e&&(window.location.search=`q=${e}&m=${r.target.value}`)})}),registerHeaderListeners(),registerSearchFormListeners();
+function registerHeaderListeners(){const e=document.querySelector(".js-header"),r=document.querySelectorAll(".js-headerMenuButton");r.forEach(s=>{s.addEventListener("click",t=>{t.preventDefault(),e?.classList.toggle("is-active"),s.setAttribute("aria-expanded",String(e?.classList.contains("is-active")))})}),document.querySelector(".js-scrim")?.addEventListener("click",s=>{s.preventDefault(),e?.classList.remove("is-active"),r.forEach(t=>{t.setAttribute("aria-expanded",String(e?.classList.contains("is-active")))})})}function registerSearchFormListeners(){const e=document.querySelector(".js-searchForm"),r=document.querySelector(".js-expandSearch"),a=e?.querySelector("input"),s=document.querySelector(".js-headerLogo"),t=document.querySelector(".js-headerMenuButton");r?.addEventListener("click",()=>{e?.classList.add("go-SearchForm--expanded"),s?.classList.add("go-Header-logo--hidden"),t?.classList.add("go-Header-navOpen--hidden"),a?.focus()}),document?.addEventListener("click",c=>{e?.contains(c.target)||(e?.classList.remove("go-SearchForm--expanded"),s?.classList.remove("go-Header-logo--hidden"),t?.classList.remove("go-Header-navOpen--hidden"))})}document.querySelectorAll(".js-searchModeSelect").forEach(e=>{e.addEventListener("change",r=>{const a=new URLSearchParams(window.location.search),t=Object.fromEntries(a.entries()).q;t&&(window.location.search=`q=${t}&m=${r.target.value}`)})}),registerHeaderListeners(),registerSearchFormListeners();
 //# sourceMappingURL=header.js.map
diff --git a/static/shared/header/header.js.map b/static/shared/header/header.js.map
index 7c3e2ae..98b04e9 100644
--- a/static/shared/header/header.js.map
+++ b/static/shared/header/header.js.map
@@ -1,7 +1,7 @@
 {
   "version": 3,
   "sources": ["header.ts"],
-  "sourcesContent": ["function registerHeaderListeners() {\n  const header = document.querySelector('.js-header');\n  const menuButtons = document.querySelectorAll('.js-headerMenuButton');\n  menuButtons.forEach(button => {\n    button.addEventListener('click', e => {\n      e.preventDefault();\n      header?.classList.toggle('is-active');\n      button.setAttribute('aria-expanded', String(header?.classList.contains('is-active')));\n    });\n  });\n\n  const scrim = document.querySelector('.js-scrim');\n  scrim?.addEventListener('click', e => {\n    e.preventDefault();\n    header?.classList.remove('is-active');\n    menuButtons.forEach(button => {\n      button.setAttribute('aria-expanded', String(header?.classList.contains('is-active')));\n    });\n  });\n}\n\nfunction registerSearchFormListeners() {\n  const BREAKPOINT = 512;\n  const logo = document.querySelector('.js-headerLogo');\n  const form = document.querySelector<HTMLFormElement>('.js-searchForm');\n  const button = document.querySelector('.js-searchFormSubmit');\n  const input = form?.querySelector('input');\n\n  renderForm();\n\n  window.addEventListener('resize', renderForm);\n\n  function renderForm() {\n    if (window.innerWidth > BREAKPOINT) {\n      logo?.classList.remove('go-Header-logo--hidden');\n      form?.classList.remove('go-SearchForm--open');\n      input?.removeEventListener('focus', showSearchBox);\n      input?.removeEventListener('keypress', handleKeypress);\n      input?.removeEventListener('focusout', hideSearchBox);\n    } else {\n      button?.addEventListener('click', handleSearchClick);\n      input?.addEventListener('focus', showSearchBox);\n      input?.addEventListener('keypress', handleKeypress);\n      input?.addEventListener('focusout', hideSearchBox);\n    }\n  }\n\n  /**\n   * Submits form if Enter key is pressed\n   */\n  function handleKeypress(e: KeyboardEvent) {\n    if (e.key === 'Enter') form?.submit();\n  }\n\n  /**\n   * Shows the search box when it receives focus (expands it from\n   * just the spyglass if we're on mobile).\n   */\n  function showSearchBox() {\n    logo?.classList.add('go-Header-logo--hidden');\n    form?.classList.add('go-SearchForm--open');\n  }\n\n  /**\n   * Hides the search box (shrinks to just the spyglass icon).\n   */\n  function hideSearchBox() {\n    logo?.classList.remove('go-Header-logo--hidden');\n    form?.classList.remove('go-SearchForm--open');\n  }\n\n  /**\n   * Expands the searchbox so input is visible and gives\n   * the input focus.\n   */\n  function handleSearchClick(e: Event) {\n    e.preventDefault();\n\n    showSearchBox();\n    input?.focus();\n  }\n}\n\n/**\n * Listen for changes in the search dropdown.\n *\n * TODO(https://golang.org/issue/44142): Fix this flow:\n * A user will likely expect to submit the search again after selecting the\n * type of search. The change event should trigger a form submission, so that the\n * search event is still captured in analytics without a manual instrumentation.\n */\ndocument.querySelectorAll('.js-searchModeSelect').forEach(el => {\n  el.addEventListener('change', e => {\n    const urlSearchParams = new URLSearchParams(window.location.search);\n    const params = Object.fromEntries(urlSearchParams.entries());\n    const query = params['q'];\n    if (query) {\n      window.location.search = `q=${query}&m=${(e.target as HTMLSelectElement).value}`;\n    }\n  });\n});\n\nregisterHeaderListeners();\nregisterSearchFormListeners();\n"],
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+  "sourcesContent": ["function registerHeaderListeners() {\n  const header = document.querySelector('.js-header');\n  const menuButtons = document.querySelectorAll('.js-headerMenuButton');\n  menuButtons.forEach(button => {\n    button.addEventListener('click', e => {\n      e.preventDefault();\n      header?.classList.toggle('is-active');\n      button.setAttribute('aria-expanded', String(header?.classList.contains('is-active')));\n    });\n  });\n\n  const scrim = document.querySelector('.js-scrim');\n  scrim?.addEventListener('click', e => {\n    e.preventDefault();\n    header?.classList.remove('is-active');\n    menuButtons.forEach(button => {\n      button.setAttribute('aria-expanded', String(header?.classList.contains('is-active')));\n    });\n  });\n}\n\nfunction registerSearchFormListeners() {\n  const searchForm = document.querySelector('.js-searchForm');\n  const expandSearch = document.querySelector('.js-expandSearch');\n  const input = searchForm?.querySelector('input');\n  const headerLogo = document.querySelector('.js-headerLogo');\n  const menuButton = document.querySelector('.js-headerMenuButton');\n  expandSearch?.addEventListener('click', () => {\n    searchForm?.classList.add('go-SearchForm--expanded');\n    headerLogo?.classList.add('go-Header-logo--hidden');\n    menuButton?.classList.add('go-Header-navOpen--hidden');\n    input?.focus();\n  });\n  document?.addEventListener('click', e => {\n    if (!searchForm?.contains(e.target as Node)) {\n      searchForm?.classList.remove('go-SearchForm--expanded');\n      headerLogo?.classList.remove('go-Header-logo--hidden');\n      menuButton?.classList.remove('go-Header-navOpen--hidden');\n    }\n  });\n}\n\n/**\n * Listen for changes in the search dropdown.\n *\n * TODO(https://golang.org/issue/44142): Fix this flow:\n * A user will likely expect to submit the search again after selecting the\n * type of search. The change event should trigger a form submission, so that the\n * search event is still captured in analytics without a manual instrumentation.\n */\ndocument.querySelectorAll('.js-searchModeSelect').forEach(el => {\n  el.addEventListener('change', e => {\n    const urlSearchParams = new URLSearchParams(window.location.search);\n    const params = Object.fromEntries(urlSearchParams.entries());\n    const query = params['q'];\n    if (query) {\n      window.location.search = `q=${query}&m=${(e.target as HTMLSelectElement).value}`;\n    }\n  });\n});\n\nregisterHeaderListeners();\nregisterSearchFormListeners();\n"],
+  "mappings": "AAAA,kCAAmC,CACjC,KAAM,GAAS,SAAS,cAAc,cAChC,EAAc,SAAS,iBAAiB,wBAC9C,EAAY,QAAQ,GAAU,CAC5B,EAAO,iBAAiB,QAAS,GAAK,CACpC,EAAE,iBACF,GAAQ,UAAU,OAAO,aACzB,EAAO,aAAa,gBAAiB,OAAO,GAAQ,UAAU,SAAS,mBAK3E,AADc,SAAS,cAAc,cAC9B,iBAAiB,QAAS,GAAK,CACpC,EAAE,iBACF,GAAQ,UAAU,OAAO,aACzB,EAAY,QAAQ,GAAU,CAC5B,EAAO,aAAa,gBAAiB,OAAO,GAAQ,UAAU,SAAS,mBAK7E,sCAAuC,CACrC,KAAM,GAAa,SAAS,cAAc,kBACpC,EAAe,SAAS,cAAc,oBACtC,EAAQ,GAAY,cAAc,SAClC,EAAa,SAAS,cAAc,kBACpC,EAAa,SAAS,cAAc,wBAC1C,GAAc,iBAAiB,QAAS,IAAM,CAC5C,GAAY,UAAU,IAAI,2BAC1B,GAAY,UAAU,IAAI,0BAC1B,GAAY,UAAU,IAAI,6BAC1B,GAAO,UAET,UAAU,iBAAiB,QAAS,GAAK,CACvC,AAAK,GAAY,SAAS,EAAE,SAC1B,IAAY,UAAU,OAAO,2BAC7B,GAAY,UAAU,OAAO,0BAC7B,GAAY,UAAU,OAAO,gCAanC,SAAS,iBAAiB,wBAAwB,QAAQ,GAAM,CAC9D,EAAG,iBAAiB,SAAU,GAAK,CACjC,KAAM,GAAkB,GAAI,iBAAgB,OAAO,SAAS,QAEtD,EAAQ,AADC,OAAO,YAAY,EAAgB,WAC7B,EACrB,AAAI,GACF,QAAO,SAAS,OAAS,KAAK,OAAY,EAAE,OAA6B,aAK/E,0BACA",
   "names": []
 }
diff --git a/static/shared/header/header.tmpl b/static/shared/header/header.tmpl
index 4e5d2a9..4fd677b 100644
--- a/static/shared/header/header.tmpl
+++ b/static/shared/header/header.tmpl
@@ -17,8 +17,9 @@
     </div>
     <div class="go-Header-inner go-Header-inner--dark">
       <nav class="go-Header-nav">
-        <a href="https://go.dev/" data-gtmc="nav link" data-test-id="go-header-logo-link">
-          <img class="js-headerLogo go-Header-logo" src="/static/shared/logo/go-white.svg" alt="Go">
+        <a href="https://go.dev/" class="js-headerLogo" data-gtmc="nav link"
+            data-test-id="go-header-logo-link">
+          <img class="go-Header-logo" src="/static/shared/logo/go-white.svg" alt="Go">
         </a>
         <div class="go-Header-rightContent">
           {{if .Experiments.IsActive "symbol-search"}}
@@ -83,26 +84,33 @@
 {{end}}
 
 {{define "symbol_search_bar"}}
-<form
-  class="go-InputGroup"
-  action="/search"
-  data-gtmc="search form"
-  aria-label="Search for a package"
-  role="search"
->
-  <select name="m" class="go-Select js-searchModeSelect">
-    <option value="packages">Packages</option>
-    <option {{if eq .SearchMode "identifiers"}}selected{{end}} value="identifiers">Identifiers</option>
-  </select>
-  <input name="q" class="go-Input" placeholder="Search for a package" />
-  <button class="go-Button go-Button--inverted" aria-label="Submit search">
-    <img
-      class="go-Icon"
-      height="24"
-      width="24"
-      src="/static/shared/icon/search_gm_grey_24dp.svg"
-      alt=""
-    />
+<div class="go-SearchForm js-searchForm">
+  <form
+    class="go-InputGroup go-SearchForm-form"
+    action="/search"
+    data-gtmc="search form"
+    aria-label="Search for a package"
+    role="search"
+  >
+    <select name="m" class="go-Select js-searchModeSelect">
+      <option value="packages">Packages</option>
+      <option {{if eq .SearchMode "identifiers"}}selected{{end}} value="identifiers">Identifiers</option>
+    </select>
+    <input name="q" class="go-Input" placeholder="Search for a package" />
+    <button class="go-Button go-Button--inverted" aria-label="Submit search">
+      <img
+        class="go-Icon"
+        height="24"
+        width="24"
+        src="/static/shared/icon/search_gm_grey_24dp.svg"
+        alt=""
+      />
+    </button>
+  </form>
+  <button class="go-SearchForm-expandSearch js-expandSearch" data-gtmc="nav button"
+      aria-label="Open search" data-test-id="expand-search">
+    <img class="go-Icon go-Icon--inverted" height="24" width="24"
+        src="/static/shared/icon/search_gm_grey_24dp.svg" alt="">
   </button>
-</form>
+</div>
 {{end}}
diff --git a/static/shared/header/header.ts b/static/shared/header/header.ts
index 8e0d848..bc3379e 100644
--- a/static/shared/header/header.ts
+++ b/static/shared/header/header.ts
@@ -20,65 +20,24 @@
 }
 
 function registerSearchFormListeners() {
-  const BREAKPOINT = 512;
-  const logo = document.querySelector('.js-headerLogo');
-  const form = document.querySelector<HTMLFormElement>('.js-searchForm');
-  const button = document.querySelector('.js-searchFormSubmit');
-  const input = form?.querySelector('input');
-
-  renderForm();
-
-  window.addEventListener('resize', renderForm);
-
-  function renderForm() {
-    if (window.innerWidth > BREAKPOINT) {
-      logo?.classList.remove('go-Header-logo--hidden');
-      form?.classList.remove('go-SearchForm--open');
-      input?.removeEventListener('focus', showSearchBox);
-      input?.removeEventListener('keypress', handleKeypress);
-      input?.removeEventListener('focusout', hideSearchBox);
-    } else {
-      button?.addEventListener('click', handleSearchClick);
-      input?.addEventListener('focus', showSearchBox);
-      input?.addEventListener('keypress', handleKeypress);
-      input?.addEventListener('focusout', hideSearchBox);
-    }
-  }
-
-  /**
-   * Submits form if Enter key is pressed
-   */
-  function handleKeypress(e: KeyboardEvent) {
-    if (e.key === 'Enter') form?.submit();
-  }
-
-  /**
-   * Shows the search box when it receives focus (expands it from
-   * just the spyglass if we're on mobile).
-   */
-  function showSearchBox() {
-    logo?.classList.add('go-Header-logo--hidden');
-    form?.classList.add('go-SearchForm--open');
-  }
-
-  /**
-   * Hides the search box (shrinks to just the spyglass icon).
-   */
-  function hideSearchBox() {
-    logo?.classList.remove('go-Header-logo--hidden');
-    form?.classList.remove('go-SearchForm--open');
-  }
-
-  /**
-   * Expands the searchbox so input is visible and gives
-   * the input focus.
-   */
-  function handleSearchClick(e: Event) {
-    e.preventDefault();
-
-    showSearchBox();
+  const searchForm = document.querySelector('.js-searchForm');
+  const expandSearch = document.querySelector('.js-expandSearch');
+  const input = searchForm?.querySelector('input');
+  const headerLogo = document.querySelector('.js-headerLogo');
+  const menuButton = document.querySelector('.js-headerMenuButton');
+  expandSearch?.addEventListener('click', () => {
+    searchForm?.classList.add('go-SearchForm--expanded');
+    headerLogo?.classList.add('go-Header-logo--hidden');
+    menuButton?.classList.add('go-Header-navOpen--hidden');
     input?.focus();
-  }
+  });
+  document?.addEventListener('click', e => {
+    if (!searchForm?.contains(e.target as Node)) {
+      searchForm?.classList.remove('go-SearchForm--expanded');
+      headerLogo?.classList.remove('go-Header-logo--hidden');
+      menuButton?.classList.remove('go-Header-navOpen--hidden');
+    }
+  });
 }
 
 /**