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chromium/third_party/blink/web_tests/external/wpt/html/rendering/the-details-element/details-before.html 

<!doctype html>
<link rel="author" title="Emilio Cobos Álvarez" href="mailto:[email protected]">
<link rel="help" title="https://github.com/whatwg/html/pull/3686">
<link rel="help" title="https://html.spec.whatwg.org/multipage/#the-details-element">
<link rel="mismatch" href="single-summary.html">
<title>CSS Test: details ::before pseudo-element</title>
<style>
  details::before { content: "::before" }
</style>
<details>
  <summary>This is the main summary</summary>
</details>