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chromium/third_party/blink/web_tests/external/wpt/html/rendering/the-details-element/details-display-type-001.html 

<!DOCTYPE HTML>
<title>Details and summary and display property (subgrid)</title>
<link rel="match" href="details-display-type-001-ref.html">
<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>

.container {
  display: grid;
  grid: 30px 75px 45px / 80px 125px 90px;
}

.container::before {
  display: block;
  content: "before";
  background: aqua;
  grid-area: 1 / 3;
}

.container::after {
  display: block;
  content: "after";
  background: yellow;
  grid-area: 3 / 1;
}

details {
  display: grid;
  grid-template: subgrid / subgrid;
  grid-area: 2 / 2 / 4 / 4;
}

details[open]::details-content {
  /* continue testing the old behavior that this was written to test */
  display: contents;
}

summary {
  display: block;
  background: fuchsia;
  grid-area: 1 / 1;
}

.contents {
  background: silver;
  grid-area: 2 / 2;
}

</style>

<div class="container">
  <details open>
    <summary>summary</summary>
    <div class="contents">contents</div>
  </details>
</div>