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

<!DOCTYPE html>
<title>fieldset and div with display: contents</title>
<link rel=fieldset-foo-ref.html>
<style>
div { display: contents; }
</style>
<p>There should be a normal fieldset below with the legend "Foo".</p>
<fieldset>
 <div>
  <legend>Foo</legend>
 </div>
</fieldset>