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Test Info:

<!DOCTYPE html>
<title>CSS aspect-ratio: grid item (ratio-dependent: block)</title>
<link rel="author" title="Mozilla" href="https://www.mozilla.org/">
<link rel="match" href="../../reference/ref-filled-green-100px-square.xht" />
<style>
#reference-overlapped-red {
position: absolute;
background-color: red;
width: 100px;
height: 100px;
z-index: -1;
}
</style>
<p>Test passes if there is a filled green square and <strong>no red</strong>.</p>
<div id="reference-overlapped-red"></div>
<div style="display: grid;">
<div style="background: green; width: 100px; aspect-ratio: 1/1;"></div>
</div>