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chromium/third_party/blink/web_tests/fast/multicol/span/span-between-text.html 

<!DOCTYPE html>
<p>There should be two lines of text below (not horizontally aligned):</p>
<div style="-webkit-columns:3; -webkit-column-gap:0; width:15em; orphans:1; widows:1;">
    <br>line1
    <div style="-webkit-column-span:all;"></div>
    line2
</div>