test-repo/website/pages/playground/index.html

<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="utf-8" />
    <meta
      name="viewport"
      content="width=device-width, initial-scale=1, user-scalable=no"
    />
    <title>Prettier</title>

    <link rel="manifest" href="/manifest.json" />

    <meta name="mobile-web-app-capable" content="yes" />
    <meta name="apple-mobile-web-app-capable" content="yes" />
    <meta name="application-name" content="Prettier" />
    <meta name="apple-mobile-web-app-title" content="Prettier" />
    <meta name="theme-color" content="#1a2b34" />
    <meta name="msapplication-navbutton-color" content="#1a2b34" />
    <meta
      name="apple-mobile-web-app-status-bar-style"
      content="black-translucent"
    />
    <meta name="msapplication-starturl" content="/" />
    <meta
      name="viewport"
      content="width=device-width, initial-scale=1, shrink-to-fit=no"
    />

    <link rel="icon" href="/icon.png" />
    <link rel="apple-touch-icon" href="/icon.png" />

    <link
      rel="stylesheet"
      crossorigin
      href="https://cdnjs.cloudflare.com/ajax/libs/codemirror/5.52.2/codemirror.min.css"
    />

    <link
      rel="stylesheet"
      crossorigin
      href="https://cdnjs.cloudflare.com/ajax/libs/codemirror/5.52.2/addon/fold/foldgutter.min.css"
    />

    <script src="https://cdnjs.cloudflare.com/ajax/libs/codemirror/5.52.2/codemirror.min.js"></script>
    <script src="https://cdnjs.cloudflare.com/ajax/libs/codemirror/5.52.2/mode/javascript/javascript.min.js"></script>
    <script src="https://cdnjs.cloudflare.com/ajax/libs/codemirror/5.52.2/mode/xml/xml.min.js"></script>
    <script src="https://cdnjs.cloudflare.com/ajax/libs/codemirror/5.52.2/mode/jsx/jsx.min.js"></script>
    <script src="https://cdnjs.cloudflare.com/ajax/libs/codemirror/5.52.2/mode/css/css.min.js"></script>
    <script src="https://cdnjs.cloudflare.com/ajax/libs/codemirror/5.52.2/mode/markdown/markdown.min.js"></script>
    <script src="https://cdnjs.cloudflare.com/ajax/libs/codemirror/5.52.2/addon/display/placeholder.min.js"></script>
    <script src="https://cdnjs.cloudflare.com/ajax/libs/codemirror/5.52.2/addon/display/rulers.min.js"></script>
    <script src="https://cdnjs.cloudflare.com/ajax/libs/codemirror/5.52.2/addon/search/searchcursor.min.js"></script>
    <script src="https://cdnjs.cloudflare.com/ajax/libs/codemirror/5.52.2/addon/edit/matchbrackets.min.js"></script>
    <script src="https://cdnjs.cloudflare.com/ajax/libs/codemirror/5.52.2/addon/edit/closebrackets.min.js"></script>
    <script src="https://cdnjs.cloudflare.com/ajax/libs/codemirror/5.52.2/addon/comment/comment.min.js"></script>
    <script src="https://cdnjs.cloudflare.com/ajax/libs/codemirror/5.52.2/addon/wrap/hardwrap.min.js"></script>
    <script src="https://cdnjs.cloudflare.com/ajax/libs/codemirror/5.52.2/addon/fold/foldcode.min.js"></script>
    <script src="https://cdnjs.cloudflare.com/ajax/libs/codemirror/5.52.2/addon/fold/foldgutter.min.js"></script>
    <script src="https://cdnjs.cloudflare.com/ajax/libs/codemirror/5.52.2/addon/fold/brace-fold.min.js"></script>
    <script src="https://cdnjs.cloudflare.com/ajax/libs/codemirror/5.52.2/keymap/sublime.min.js"></script>

    <script src="https://cdnjs.cloudflare.com/ajax/libs/clipboard.js/2.0.4/clipboard.min.js"></script>
    <script src="https://cdnjs.cloudflare.com/ajax/libs/lz-string/1.4.4/lz-string.min.js"></script>
    <script src="https://cdnjs.cloudflare.com/ajax/libs/react/16.13.1/umd/react.production.min.js"></script>
    <script src="https://cdnjs.cloudflare.com/ajax/libs/react-dom/16.13.1/umd/react-dom.production.min.js"></script>

    <link rel="stylesheet" href="/separate-css/playground.css" />

    <!-- Global site tag (gtag.js) - Google Analytics -->
    <script
      async
      src="https://www.googletagmanager.com/gtag/js?id=UA-111350464-1"
    ></script>
    <script>
      window.dataLayer = window.dataLayer || [];
      function gtag() {
        dataLayer.push(arguments);
      }
      gtag("js", new Date());
      gtag("config", "UA-111350464-1");
    </script>
  </head>

  <body>
    <header>
      <a href="/" class="logo-wrapper">
        <img class="logo" src="/icon.png" alt="" />
        <h1>Prettier <span id="version"></span></h1>
      </a>

      <span class="links">
        <a
          class="github-button"
          href="https://github.com/prettier/prettier"
          data-show-count="true"
          aria-label="Star prettier on GitHub"
        >
          GitHub
        </a>
      </span>
    </header>

    <div id="root" class="playground-container"></div>

    <script src="/playground.js"></script>

    <script src="/install-service-worker.js"></script>

    <script async defer src="https://buttons.github.io/buttons.js"></script>
  </body>
</html>