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Test Info:

<!DOCTYPE html>
<link rel="author" title="Morten Stenshorne" href="mailto:mstensho@chromium.org">
<link rel="help" href="https://www.w3.org/TR/css-contain-1/">
<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="contain:strict; width:100px; height:100px; background:red;">
<div id="f1" style="position:fixed; left:100px; width:50px; height:100px; background:green;">
<div style="contain:strict; width:100px; height:100px;">
<div id="f2" style="position:fixed; left:100px; width:50px; height:100px; background:green;"></div>
</div>
</div>
</div>
<script>
document.body.offsetTop;
f1.style.left = "0";
f2.style.left = "50px";
</script>