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

<!DOCTYPE html>
<title>Reference with a fieldset and legend "Foo"</title>
<p>There should be a normal fieldset below with the legend "Foo".</p>
<fieldset>
  <legend>Foo</legend>
</fieldset>