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

<!DOCTYPE html>
<script src="../../resources/testharness.js"></script>
<script src="../../resources/testharnessreport.js"></script>
<pre id="sample" contenteditable="true">
foo
<div contenteditable="false">bar
</div>

</pre>
<div id="log"></div>
<script>
test(function() {
    var container = document.getElementById('sample');
    var range = document.createRange()
    range.setEndAfter(container.lastChild);
    window.getSelection().addRange(range);
    document.execCommand('formatblock', false, '<h1>');
}, 'formatblock');
</script>