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<!DOCTYPE html>
<title>contain:inline-size on legend</title>
<link rel="author" title="Morten Stenshorne" href="mailto:mstensho@chromium.org">
<p>There should be blue square (legend), and a yellow square below it (fieldset
content).</p>
<fieldset style="width:fit-content; min-width:0;">
<legend style="width:0; border:solid blue; border-width:0 50px; padding:0; background:red;">
<div style="width:500px; height:100px;"></div>
</legend>
<div style="height:100px; background:yellow;"></div>
</fieldset>