Codebase Browser
chromium
Go to App

chromium/third_party/blink/web_tests/external/wpt/html/semantics/embedded-content/media-elements/track/track-element/track-insert-after-load.html 

<!DOCTYPE  html>
<title>Inserting a track element immediately after video load</title>
<script src="/common/media.js"></script>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script>
async_test(function(t) {
    var video = document.createElement('video');
    video.src = getVideoURI('/media/test');
    video.load();
    video.appendChild(document.createElement('track'));
    video.onloadedmetadata = t.step_func_done();
});
</script>