<p>This tests for a hang when creating a list out of several paragraphs, one of which is a horizontal rule.  You should see four list items below, the second and the fourth should contain horizontal rules.</p>
<div id="div" contenteditable="true">foo<hr>bar<hr></div>

<script>
if (window.testRunner)
    window.testRunner.dumpAsText();
document.getElementById("div").focus();
document.execCommand("SelectAll");
document.execCommand("InsertUnorderedList");
</script>