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

<!doctype html>
<title>fieldset painting order</title>
<link rel=match href=fieldset-painting-order-ref.html>
<style>
fieldset, legend { margin: 0; padding: 0; }
fieldset {
  border: 100px solid red;
  width: 0;
  min-width: 0;
  height: 0;
}
legend { width: 200px; height: 200px; margin-left: -100px; background: green; }
legend > span { float: right; margin-top: 100px; width: 100px; height: 100px; background: red; }
fieldset > div { margin-top: -100px; background: lime; width: 200px; height: 200px; }
</style>
<p>There should be no red.</p>
<fieldset><legend><span></span></legend><div></div></fieldset>