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chromium/third_party/blink/web_tests/external/wpt/html/semantics/forms/the-selectlist-element/selectlist-selected-value-behavior.tentative.html 

<!DOCTYPE html>
<link rel=author href="mailto:[email protected]">
<link rel=match href="selectlist-selected-value-behavior-ref.html">

<selectlist>
  <div style="color:blue" slot=selected-value behavior=selected-value></div>
  <option>hello world</option>
</selectlist>