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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="multicol" style="columns:4;">
<div style="height:0;">
<div style="height:20px;"></div>
<div style="break-before:column; height:10px;"></div>
<div style="break-before:column; height:10px;"></div>
<div style="column-span:all; height:10px;"></div>
</div>
<div style="height:320px;"></div>
</div>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script>
test(()=> {
assert_equals(multicol.offsetHeight, 100);
}, "Spanner in overflowed parent with forced breaks");
</script>