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chromium/third_party/blink/web_tests/external/wpt/html/semantics/embedded-content/media-elements/loading-the-media-resource/resource-selection-invoke-insert-source-not-in-document.html 

<!doctype html>
<title>invoking resource selection by inserting &lt;source> in video not in a document</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<div id=log></div>
<script>
async_test(function(t) {
  var v = document.createElement('video');
  v.onloadstart = t.step_func(function() { t.done(); });
  v.appendChild(document.createElement('source'));
  window.onload = t.step_func(function() { assert_unreached(); });
});
</script>