<script>
if (window.testRunner) {
    testRunner.dumpAsText();
    testRunner.waitUntilDone();
}

setTimeout(function(){
        document.body.innerHTML = "<b>PASS:</b> body and iframe cleared without crashing.";
        testRunner.notifyDone();
    }, 0);
</script>
<body onload='document.getElementById("x").innerHTML = ""'>
  <div id="x">
    <iframe src="does-not-exist">
  </div>
</body>