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chromium/third_party/blink/web_tests/external/wpt/html/semantics/embedded-content/media-elements/src_object_blob.html 

<!doctype html>
<meta charset="utf-8">
<title>HTMLMediaElement.srcObject blob</title>
<script src='/common/media.js'></script>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src=/resources/testdriver.js></script>
<script src=/resources/testdriver-vendor.js></script>
<video></video>
<script>
  const video = document.querySelector("video");
  promise_test(async () => {
    const blob = await fetch(getVideoURI('/media/movie_5'))
          .then(r => r.blob());
    try {
      video.srcObject = blob;
    } catch (error) {
      assert_unreached(error);
    }
    const done = new Promise(res => video.addEventListener('ended', res));
    test_driver.bless('initiate media playback', function () {
      video.play();
    });
    return done;
  });
</script>