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chromium/third_party/blink/web_tests/external/wpt/mediacapture-record/support/MediaRecorder-iframe.html 

<!DOCTYPE html>
<title>Start a MediaRecorder</title>
<html>
<body>
<script src="../utils/sources.js"></script>
<script>
    var context;
    var recorder;
    var video;
    var control;

    function prepareForTest(test) {
        const obj = createVideoStream(test);
        video = obj.stream;
        control = obj.control;
        recorder = new MediaRecorder(video);
    }
</script>
</body>
</html>