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

<!DOCTYPE html>
<style>
div {
  display: block;
  font-size: 32px;
  background: lime;
  width: 10em;
}
</style>

<div>legend</div>
<div>legend</div>