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" />
    <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" />

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    <script
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      referrerpolicy="no-referrer"
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    <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"
      crossorigin="anonymous"
      referrerpolicy="no-referrer"
    ></script>
  </body>
</html>