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Test Info:

<!DOCTYPE html>
<link rel="help" href="https://crbug.com/1214198">
<link rel="author" title="Koji Ishii" href="mailto:kojii@chromium.org">
<style>
.contain {
contain: strict;
display: block;
width: 100px;
height: 100px;
}
</style>
<body>
<div id="outer" class="contain">
<div>
<div id="inner" class="contain"></div>
</div>
</div>
<script>
document.body.offsetTop;
inner.appendChild(document.createTextNode('inner-child'));
outer.appendChild(document.createTextNode('outer-child'));
</script>
</body>