LayoutTests/editing/inserting/paragraph-separator-in-table-1.html

<script>
if (window.testRunner)
     testRunner.dumpEditingCallbacks();
</script>
<p>This tests InsertParagraphSeparator inside table cells.  'Cell' and 'Two' should be on separate lines.</p>

<div contenteditable="true"><table border="1"><tr><td>Cell One</td><td>Cell<span id="test">Two</span></td></tr></table></div>

<script>
var e = document.getElementById("test").firstChild;
var s = window.getSelection();

s.setPosition(e, 0);
document.execCommand("InsertParagraph");
</script>