LayoutTests/editing/deleting/pruning-after-merge-3.html

<p>You should see:<br>b<b>arbaz</b></p>
<div id="b" contenteditable="true">boo<b><br><div style="display:inline-block"><div>bar</div><div>baz</div></div></b></div>

<script>
var s = window.getSelection();

s.setPosition(b, 0);
s.modify("move", "forward", "character");
s.modify("extend", "forward", "line");

document.execCommand("Delete");
</script>