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

<!doctype html>
<title>Reference for floated legend should not disappear</title>
<style>
  div { width: 100px; height: 100px; background: lime; }
</style>
<p>There should be no red.</p>
<div></div>