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chromium/third_party/blink/web_tests/external/wpt/html/rendering/non-replaced-elements/the-fieldset-and-legend-elements/grid-template-propagation.html 

<!DOCTYPE html>
<link rel="match" href="grid-template-propagation-ref.html">
<link rel="help" href="https://bugs.chromium.org/p/chromium/issues/detail?id=1222988">
<link rel="help" href="https://html.spec.whatwg.org/C/#anonymous-fieldset-content-box">
<style>
fieldset {
  display: grid;
  grid-template: auto / 1fr;
  grid-template-areas: "a";
  width: 100px;
  height: 100px;
  margin: 0;
  border: none;
  padding: 0;
}
</style>
<p>There should be a green box below.</p>
<fieldset>
  <div style="background: green; grid-area: a"></div>
</fieldset>