LayoutTests/editing/deleting/paragraph-in-preserveNewline.html

<script>
if (window.layoutTestController)
     layoutTestController.dumpEditingCallbacks();
</script>
<p>This tests for a bug where deleting a paragraph in preserveNewline text would introduce an extra line.  You should see '\nbar' below.</p>
<div id="test" contenteditable="true"><pre>foo
bar</pre></div>

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

sel.setPosition(e, 0);
sel.modify("extend", "forward", "character");
sel.modify("extend", "forward", "character");
sel.modify("extend", "forward", "character");
document.execCommand("Delete");
</script>