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chromium/third_party/blink/web_tests/external/wpt/html/rendering/the-details-element/summary-text-decoration.html 

<!doctype html>
<title>Rendering of summary element with text-decoration</title>
<link rel="match" href="summary-text-decoration-ref.html">
<link rel="help" href="https://html.spec.whatwg.org/multipage/rendering.html#the-details-and-summary-elements">
<meta name="assert" content="Checks that text-decoration applies to rendered summary element.">
<style>
  summary { text-decoration: underline; }
</style>
<details>
  <summary>This text should be underlined.</summary>
</details>