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chromium/third_party/blink/web_tests/external/wpt/html/semantics/forms/the-selectlist-element/selectlist-selectedoption-element-cloning.tentative.html 

<!DOCTYPE html>
<link rel=author href="mailto:[email protected]">
<link rel=help href="https://github.com/openui/open-ui/issues/571">
<link rel=match href="selectlist-selectedoption-element-cloning-ref.html">

<selectlist>
  <button type=selectlist>
    <selectedoption></selectedoption>
  </button>
  <option><span style="color:red">red</span> one</option>
</selectlist>