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chromium/third_party/blink/web_tests/fast/multicol/change-column-rule-expected.html 

<!DOCTYPE html>
<p>The rules below should be green, and there should be no assertion failures.</p>
<div id="mc" style="columns:3; line-height:100px; column-rule:solid green;">
    <br>
    <br>
    <br>
</div>