static/frontend/frontend.tmpl

<!--
  Copyright 2021 The Go Authors. All rights reserved.
  Use of this source code is governed by a BSD-style
  license that can be found in the LICENSE file.
-->

<!DOCTYPE html>
<html lang="en" data-layout="{{if .UseResponsiveLayout}}responsive{{end}}" data-local="{{if .LocalMode}}true{{end}}">
  <head>
    <!-- This will capture unhandled errors during page load for reporting later. -->
    <script>
      window.addEventListener('error', window.__err=function f(e){f.p=f.p||[];f.p.push(e)});
    </script>
    <script>
      (function() {
        const theme = document.cookie.match(/prefers-color-scheme=(light|dark|auto)/)?.[1]
        if (theme) {
          document.querySelector('html').setAttribute('data-theme', theme);
        }
      }())
    </script>
    <meta charset="utf-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    {{block "description" .}}
      <meta name="description" content="Go is an open source programming language that makes it easy to build simple, reliable, and efficient software.">
    {{end}}
    {{block "robots" .}}{{end}}
    <meta class="js-gtmID" data-gtmid="{{.GoogleTagManagerID}}">
    <link rel="shortcut icon" href="/static/shared/icon/favicon.ico">
    {{block "canonical" .}}{{end}}
    <link href="/static/frontend/frontend.min.css?version={{.AppVersionLabel}}" rel="stylesheet">
    {{if not .LocalMode}}
    <link rel="search" type="application/opensearchdescription+xml" href="/opensearch.xml" title="Go Packages">
    {{end}}
    {{block "title" .}}
      <title>{{if .HTMLTitle}}{{.HTMLTitle}} - {{end}}Go Packages</title>
    {{end}}
    {{block "pre-content" .}}{{end}}
  </head>
  <body>
    <!-- loadScript appends JS sources to the document head. It loads scripts as asynchronous
        modules by default, eliminating parser-blocking JavaScript. -->
    <script>
      function loadScript(src, mod = true) {
        let s = document.createElement('script');
        s.src = src;
        if (mod) {
          s.type = 'module';
          s.async = true;
          s.defer = true
        }
        document.head.appendChild(s);
      }
      loadScript("/third_party/dialog-polyfill/dialog-polyfill.js", false)
      loadScript("/static/frontend/frontend.js");
    </script>
    {{template "header" .}}
    {{template "main" .}}
    {{template "footer" .}}
    {{template "modals" .}}
    {{if not .LocalMode}}
      <section class="Cookie-notice js-cookieNotice">
        <div>go.dev uses cookies from Google to deliver and enhance the quality of its services and to
        analyze traffic. <a target=_blank href="https://policies.google.com/technologies/cookies">Learn more.</a></div>
        <div><button class="go-Button">Okay</button></div>
      </section>
    {{end}}
    {{if .GoogleTagManagerID}}
      <script>
        // this will throw if the querySelector can’t find the element
        const gtmId = document.querySelector('.js-gtmID').dataset.gtmid;
        if (!gtmId) {
          throw new Error('Google Tag Manager ID not found');
        }
        loadScript(`https://www.googletagmanager.com/gtm.js?id=${gtmId}`);
      </script>
      <noscript>
        <iframe src="https://www.googletagmanager.com/ns.html?id={{.GoogleTagManagerID}}"
                height="0" width="0" style="display:none;visibility:hidden">
        </iframe>
      </noscript>
    {{end}}
    {{block "post-content" .}}{{end}}
  </body>
</html>