LayoutTests/editing/execCommand/format-block-uneditable-crash.html

<!DOCTYPE html>
<html>
<head>
<script src="../editing.js"></script>

<script>
if (window.testRunner)
    testRunner.dumpAsText();
    
function editingTest() {
    var container = document.getElementById('sample');
    var range = document.createRange()
    range.setEndAfter(container.lastChild);
    window.getSelection().addRange(range);
    document.execCommand('formatblock', false, '<h1>');
    document.write("PASS. WebKit didn't crash.");
};
</script>
</head>
<body onload=runEditingTest()>
<pre id="sample" contenteditable="true">
foo
<div contenteditable="false">bar
</div>

</pre>
</body>
</html>