<!doctype html>
<title>Test load of media document in sandboxed iframe</title>
<link rel="motivation" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1783601">
<script src=/resources/testharness.js></script>
<script src=/resources/testharnessreport.js></script>
<body></body>
<script>
promise_test(async () => {
  const frame = document.createElement('iframe');
  frame.sandbox = '';
  frame.src =
    // 'PartialContent' ensures that the entire video resource does not load
    // in one fetch.
    '/service-workers/service-worker/resources/fetch-access-control.py?'
    + 'VIDEO&PartialContent';

  document.body.appendChild(frame);
  await new Promise(resolve => frame.onload = resolve);

  const video = SpecialPowers.wrap(frame).contentDocument.body.childNodes[0];
  video.muted = true;  // to allow playback
  return video.play();
});
</script>
