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Test Info:

<!DOCTYPE html>
<link rel="author" title="Morten Stenshorne" href="mailto:mstensho@chromium.org">
<style>
#query_elm {
position: absolute;
left: anchor(--a1 left);
top: anchor(--a1 top);
right: anchor(--a1 right);
bottom: anchor(--a1 bottom);
background: green;
}
</style>
<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="width:100px; height:100px; background:red;">
<div style="columns:3; column-fill:auto; gap:10px; inline-size:230px; block-size:100px; writing-mode:vertical-rl;">
<div style="block-size:30px;"></div>
<div style="position:relative; inline-size:100px; block-size:200px;">
<div style="block-size:20px;"></div>
<div style="anchor-name:--a1; inline-size:20px; block-size:70px;"></div>
<div id="query_elm"></div>
</div>
</div>
</div>