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chromium/third_party/blink/web_tests/fast/multicol/span/as-inner-multicol.html 

<!DOCTYPE html>
<p>Test that an inner multicol that's also a spanner is rendered correctly.</p>
<p>There should be a green cross below. The word "PASS" should be seen on its right arm.</p>
<div style="-webkit-column-count:2; line-height:50px; width:300px; -webkit-column-rule:100px solid green;">
    <br>
    <br>
    <br>
    <div style="-webkit-column-span:all; -webkit-columns:3; -webkit-column-gap:0; text-align:center; color:white; background:green;">
        <br><br><br><br><br>PASS
    </div>
    <br>
    <br>
    <br>
</div>