chromium/chrome/test/data/webapps_integration/file_handler/foo_handler.html

<!DOCTYPE html>
<html>
<head>
  <title>File Handler - Text Handler</title>
    <script src="/webapps_integration/test_utils.js"></script>
    <script src="/webapps_integration/file_handler/app.js"></script>
</head>
<body>
  <h1>File Handler - Text Handler</h1>
  <div>
    <p>
        TODO: Add code to verify the text files loaded are correct.
    </p>
    <p>
      This site is used for dPWA integration tests, and is subject to modification to support that framework. See
      <a
        href="https://chromium.googlesource.com/chromium/src/+/main/docs/webapps/integration-testing-framework.md">https://chromium.googlesource.com/chromium/src/+/main/docs/webapps/integration-testing-framework.md</a>
    </p>
  </div>
  <br>
  <div id="viewers-container"></div>
  <div id="opened-files-container"></div>
  <template id="file-viewer-template">
    <div>
      <p>File: <span name="file-name"></span></p>
      <textarea
        name="file-contents"
        cols="80"
        rows="10"
        style="white-space: pre-wrap"
      >
      </textarea>
    </div>
  </template>
</body>
</html>