chromium/fuchsia_web/shell/data/index.html

<html><body>
    <script>
      body.onload = function() { console.log("The test page has loaded."); }
    </script>
    <style>
      body { background-color:fuchsia;}
    </style>
    <h1>It works!</h1>
    <p>This is a test of content hosted at the URL
    <a href="fuchsia-pkg://shell-data/index.html">
      fuchsia-pkg://shell-data/index.html
    </a></p>
</body></html>