<!DOCTYPE html>
<html>
<body>
<script>
if (window.testRunner) {
    testRunner.dumpAsText();
    testRunner.waitUntilDone();
}
const textarea = document.createElement("textarea");
textarea.setAttribute("autofocus", "");
textarea.addEventListener("DOMFocusIn", function () { document.documentElement.innerHTML = ""; }, false);
document.documentElement.appendChild(textarea);
requestAnimationFrame(() => {
    document.body.innerHTML = "PASS unless crash.";
    if (window.testRunner)
        testRunner.notifyDone();
});
</script>
</body>
</html>