<!DOCTYPE html>
<html>
<body>
PASS if no crash.
<span id=span></span>
<span id=wrapper></span>
<textarea id=textarea onfocus="eventhandler()"></textarea>
<script>
if (window.testRunner)
    testRunner.dumpAsText();
document.offsetHeight;
textarea.autofocus = true;
var iframe = document.createElement("iframe");
span.appendChild(iframe);
wrapper.appendChild(textarea);
iframe.contentDocument.caretRangeFromPoint();

function eventhandler() {
    textarea.insertAdjacentElement("beforeBegin", span);
}
</script>
</body>
</html>