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chromium/third_party/blink/web_tests/external/wpt/fetch/security/dangling-markup/media.html 

<!DOCTYPE html>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<body>
<script>
  var resources = {"audio": "/media/sound_5.mp3", "video":"/media/test.mp4"};

  for (const key in resources){
    async_test(t => {
      let elem = document.body.appendChild(document.createElement(key));
      elem.onerror = t.unreached_func(`${key} should load`);
      elem.oncanplay = t.step_func(() => {
        t.done();
      });
      elem.src = resources[key];
    }, `Should load ${key}`);

    async_test(t => {
      let elem = document.body.appendChild(document.createElement(key));
      elem.onerror = t.step_func(() => {
        t.done();
      });
      elem.oncanplay = t.unreached_func(`${key} should not load`);
      elem.src = resources[key] + "?\n<";
    }, `Should not load ${key} with dangling markup in URL`);
  }
</script>