mediasource-garbage-collection-before-sourceopen.html

<!DOCTYPE html>
<title>Tests that "sourceopen" event fires even if garbage collection happens between setting "video.src" and the "sourceopen" event.</title>
<script src="/w3c/resources/testharness.js"></script>
<script src="/w3c/resources/testharnessreport.js"></script>
<video></video>
<script>
async_test(function(t) {
    var video = document.querySelector('video');
    video.onstalled = t.unreached_func();

    var url = createMediaSourceURL();
    // Running garbage collector.
    gc();

    // Setting video.src to object URL.
    video.src = url;

    function createMediaSourceURL() {
        var mediaSource = new MediaSource();
        // Setting sourceopen event listener.
        mediaSource.onsourceopen = t.step_func_done();
        return URL.createObjectURL(mediaSource);
    }
});
</script>

chromium/third_party/blink/web_tests/http/tests/media/media-source/mediasource-garbage-collection-before-sourceopen.html