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chromium/third_party/blink/web_tests/fast/multicol/span/float-with-margin-at-row-boundary-before-spanner-crash.html 

<!DOCTYPE html>
<div style="columns:3;">
    <div style="columns:1; padding-top:100px;">
        <div style="float:right; margin-top:1em;">
            <div style="margin-top:1em;"></div>
        </div>
        <div style="column-span:all;"></div>
    </div>
</div>
<script src="../../../resources/testharness.js"></script>
<script src="../../../resources/testharnessreport.js"></script>
<script>
    test(function() { }, "No crash!");
</script>