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chromium/third_party/blink/web_tests/external/wpt/html/rendering/the-details-element/details-pseudo-elements-003.html 

<!DOCTYPE HTML>
<title>::details-content pseudo element is display: block</title>
<link rel="match" href="details-pseudo-elements-003-ref.html">
<link rel="help" href="https://drafts.csswg.org/css-pseudo-4/#details-content-pseudo">
<link rel="help" href="https://github.com/whatwg/html/pull/10265">
<link rel="help" href="https://github.com/dbaron/details-styling">
<link rel="help" href="https://crbug.com/1469418">
<style>

summary { display: block }
details::details-content { opacity: 0.5; }

details

</style>

<details open>
  <summary>summary</summary>
  contents
</details>