<!DOCTYPE html><!-- webkit-test-runner [ jscOptions=--validateExceptionChecks=true ] -->
<html>
<head>
<script src="../../resources/js-test-pre.js"></script>
</head>
<body>
<script>
    if (window.testRunner)
        testRunner.dumpAsText();

    let d0 = document.createElement('audio');
    let d1 = document.createElement('track');
    d0.appendChild(d1);
</script>
<script src="../../resources/js-test-post.js"></script>
</body>
</html>