<!DOCTYPE html>
<script src="resources/polyfill.js"></script>

<p>A mixed case of a shadow element and content element.</p>
<form><!-- margin-top will be cancelled out, so we use padding-top here. -->
    <div style="margin: 2px 2px 2px; padding-top: 2px; font: -webkit-small-control;"><span style="font: -webkit-small-control;">foobar</span><div style="margin: 20px">
        <keygen style="margin: 0">
    </div></div>
</form>