third_party/WebKit/LayoutTests/editing/execCommand/create-list-with-hr.html

<script>
if (window.testRunner)
     testRunner.dumpEditingCallbacks();
</script>
<p>This test pushes a horizontal rule into an unordered list with InsertUnorderedList. <b>This demonstrates what might be a bug:</b> the horizontal rule appears before the list marker in the render tree.</p>
<div contenteditable="true" id="div"><hr></div>

<script>
var div = document.getElementById("div");
var sel = window.getSelection();

sel.collapse(div, 0);
document.execCommand("InsertUnorderedList");
</script>