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chromium/third_party/blink/web_tests/external/wpt/css/css-sizing/aspect-ratio/replaced-element-017.html 

<!DOCTYPE html>
<html class="reftest-wait">
<title>CSS aspect-ratio: canvas</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="match" href="reference/ref-filled-green-100x20-rect.html" />

<canvas width=200 height=200 style='width:100px; aspect-ratio:5/1;'></canvas>
<script>
  window.onload = function() {
    const canvas = document.querySelector('canvas');
    const ctx = canvas.getContext('2d');
    ctx.fillStyle = 'green';
    ctx.fillRect(0, 0, 200, 200);
    document.documentElement.removeAttribute('class');
  }
</script>
</html>