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chromium/third_party/blink/web_tests/external/wpt/html/rendering/non-replaced-elements/the-fieldset-and-legend-elements/fieldset-transform-translatez.html 

<!DOCTYPE html>
<title>Fieldset and transform: translateZ(0)</title>
<link rel=match href=fieldset-transform-translatez-ref.html>
<style>
#outer { transform: translateZ(0); }
fieldset { background: #eee; overflow: hidden; margin: 0 0 10px; }
#inner { position: relative; }
</style>
<p>It should say PASS below without anything obscuring the text.</p>
<div id=outer>
  <fieldset>
    <legend>
      <div id="inner">PASS</div>
    </legend>
  </fieldset>
</div>