css/css-sizing/aspect-ratio/flex-aspect-ratio-021.html

<!DOCTYPE html>
<title>CSS aspect-ratio: Flex item main size with flex-basis:content and width in Row flex container</title>
<link rel="author" title="Mozilla" href="https://www.mozilla.org/">
<link rel="help" href="https://drafts.csswg.org/css-sizing-4/#aspect-ratio">
<link rel="help" href="https://drafts.csswg.org/css-flexbox-1/#algo-main-item">
<link rel="match" href="../../reference/ref-filled-green-100px-square.xht" />

<p>Test passes if there is a filled green square and <strong>no red</strong>.</p>

<div style="display: flex;">
  <div style="background: green; flex-basis: content; height: 100px;
              aspect-ratio: 1/1; width: 20px; min-width: 0;"></div>
</div>