This tests for a crash when trying to switch the list type of an inner list at the end. You shouldn't get a crash. This test used to flatten the list but this behavior was correct to match Firefox and MSIE in the bug 43166.

One
Two
Three
Four
<ul><li>One</li><li>Two</li><ul><li>Three</li><li>Four</li></ul></ul>

PASS
