format-block-with-uneditable-crash.html

<!DOCTYPE html>
<html>
<head>
<script>
if (window.testRunner)
    testRunner.dumpAsText();

onload = function() {
    document.designMode = 'on';
    document.execCommand('SelectAll');
    document.execCommand('FormatBlock', false, '<pre>');
    document.documentElement.textContent = 'PASS if Blink doesn\'t crash.';
};
</script>
</head>
<body>
ab<embed contenteditable="false"></embed>xyz
</body>
</html>

chromium/third_party/blink/web_tests/editing/execCommand/format-block-with-uneditable-crash.html