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Test Info: Warnings

<!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">
<p>Test passes if there is a filled green square below.</p>
<div id="mc" style="columns:4; width:100px; background:green;">
<div style="margin-top:30px; height:70px; break-inside:avoid;"></div>
</div>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script>
test(()=> {
assert_equals(mc.offsetHeight, 100);
});
</script>