LayoutTests/http/tests/contentextensions/media-filtered.html

<script>
if (window.testRunner)
    testRunner.waitUntilDone();

function videoCanPlay()
{
    console.log("Video can play");
    if (window.testRunner)
        testRunner.notifyDone();
}

function videoError()
{
    console.log("Video error");
    if (window.testRunner)
        testRunner.notifyDone();
}

</script>
The following video should not load.<br>
<video onerror="videoError();" oncanplay="videoCanPlay();" src="http://localhost:8000/media/resources/test.mp4" autoplay></video>