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chromium/third_party/blink/web_tests/external/wpt/css/css-sizing/contain-intrinsic-size/contain-intrinsic-size-014.html 

<!doctype html>
<meta charset="utf8">
<title>CSS contain-intrinsic-size: fieldset</title>
<link rel="author" title="Vladimir Levin" href="mailto:[email protected]">
<link rel="help" href="https://drafts.csswg.org/css-sizing-4/#intrinsic-size-override">
<link rel="match" href="contain-intrinsic-size-014-ref.html">
<meta name="assert" content="contain-intrinsic-size sizes fieldsets">

<style>
fieldset {
  width: max-content;
  contain-intrinsic-size: 111px 222px;
  contain: size;
}
</style>

<fieldset>
  <legend>This is a legend</legend>
  This is some content.
</fieldset>