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Test Info:

<!DOCTYPE html>
<link rel="author" title="Morten Stenshorne" href="mailto:mstensho@chromium.org">
<link rel="match" href="../reference/ref-filled-green-100px-square.xht">
<p>Test passes if there is a filled green square and <strong>no red</strong>.</p>
<div style="columns:2; column-fill:auto; column-gap:0; width:100px; height:100px; background:red;">
<!-- First outer column -->
<div style="height:50px; background:green;"></div>
<div style="columns:2; column-fill:auto; column-gap:0;">
<!-- First and second inner column in the first row -->
<div style="width:200%; height:100px; background:green;"></div>
<!-- Second outer column, first column in the second row. -->
<div style="height:50px; background:green;"></div>
<!-- Second column in the second row. Pushing this to a third outer column
(and third inner row) wouldn't be ideal, since we'd overflow just as
much in the block direction by doing that. -->
<div style="contain:size; height:150px;">
<div style="height:100px; background:green;"></div>
</div>
</div>
</div>