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

<!doctype html>
<title>floated legend should not disappear</title>
<link rel=match href=legend-float-ref.html>
<style>
  fieldset { margin: 0; padding: 0; border: none; width: 100px; height: 50px; background: red; }
  legend { width: 100px; height: 50px; background: lime; padding: 0; }
  .left { float: left; }
  .right { float: right; }
</style>
<p>There should be no red.</p>
<fieldset><legend class=left></legend></fieldset>
<fieldset><legend class=right></legend></fieldset>