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Test Info:

<!DOCTYPE html>
<link rel="author" title="Morten Stenshorne" href="mailto:mstensho@chromium.org">
<meta name="assert" content="Test how a float inside a block with cloned box decoration behaves.">
<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:4; column-fill:auto; gap:0; width:100px; height:100px; background:red;">
<!-- #container takes up exactly two columns (2 * 40px of box decorations in
each column, plus 40px of content box height). The float will steer clear
of its cloned border at the bottom of the first column and at the start
of the second column, but the border at the end of the second column is
just a regular end border, not a cloned one, so the float will overlap
with it. -->
<div id="container" style="box-decoration-break:clone; border:solid green; border-width:40px 0; height:40px;">
<div style="float:left; width:100%; height:280px; background:green;"></div>
</div>
</div>