<style>
    span:after { content: 'not '; }
</style>
<p>
    Test for <i><a href="rdar://problem/7898436">rdar://problem/7898436</a> :after content is duplicated</i>.
</p>
<p>
    The test passed if the word &ldquo;not&rdquo; appears exactly once in the following sentence:
</p>
<div style="font-size: 96px;">
The test did
<span><b><div></div></b></span>
fail.
</div>