chromium/third_party/blink/web_tests/external/wpt/css/css-sizing/aspect-ratio/fieldset-element-002.html

<!DOCTYPE html>
<title>CSS aspect-ratio: Test that fieldset's block size honors automatic content-based minimum, but capped by its maximum block-size</title>
<link rel="author" title="Ting-Yu Lin" href="mailto:[email protected]">
<link rel="author" title="mozilla" href="https://www.mozilla.org/">
<link rel="help" href="https://drafts.csswg.org/css-sizing-4/#aspect-ratio-minimum">
<link rel="match" href="fieldset-element-002-ref.html">

<style>
  fieldset {
    inline-size: 200px;
    aspect-ratio: 20 / 1;
    max-block-size: 20px;
    background: yellow;
  }

  legend {
    background: black;
    color: white;
    padding: 3px 6px;
  }
</style>

<form>
  <fieldset>
    <legend>Choose one item:</legend>

    <input type="radio" id="item1" name="item">
    <label for="item1">item 1</label><br/>

    <input type="radio" id="item2" name="item">
    <label for="item2">item 2</label><br/>

    <input type="radio" id="item3" name="item">
    <label for="item3">item 3</label>
  </fieldset>
</form>