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chromium/third_party/blink/web_tests/external/wpt/css/css-values/calc-size/calc-size-aspect-ratio-001.html 

<!DOCTYPE html>
<link rel="help" href="https://drafts.csswg.org/css-values-5/#calc-size">
<link rel="help" href="https://drafts.csswg.org/css-sizing-4/#aspect-ratio">
<link rel="match" href="../../reference/ref-filled-green-100px-square-only.html">
<p>Test passes if there is a filled green square.</p>
<!-- Without calc-size() "auto" would resolve to 50px, and passing through calc-size() will yield 100px. -->
<div style="aspect-ratio: 1/2; height: 100px; width: calc-size(auto, size + 50px); background: green;"></div>