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Test Info:

<!DOCTYPE html>
<link rel="author" title="Joey Arhar" href="mailto:jarhar@chromium.org">
<!-- No crash should occur if a focused element is moved to another document. -->
<div id=editable contenteditable=>
<script>
editable.addEventListener('blur', function() {
document.execCommand('InsertText', false, '\t');
});
editable.focus();
const secondDoc = document.implementation.createDocument('', null);
secondDoc.appendChild(editable);
</script>