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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-multicol-1/#cf">
<div id="outer" style="columns:2;">
<div id="inner" style="columns:2; border-top:solid 3px;">
<div style="height:97px; contain:size;"></div>
</div>
</div>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script>
test(()=> {
assert_equals(outer.offsetHeight, 100);
}, "Nested balancing outer height");
test(()=> {
assert_equals(inner.offsetHeight, 100);
}, "Nested balancing inner height");
</script>