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Test Info:

<!DOCTYPE html>
<title>tall legend</title>
<link rel=match href=legend-tall-ref.html>
<style>
body, p { margin: 0; }
fieldset { height: 30px; margin: 0; border: 20px solid green; padding: 0px; background: red; }
legend { height: 160px; background: lime; padding: 0; }
#behind {
position: absolute;
z-index: -1;
margin-top: calc((/* half legend height */ 160px / 2) - (/* half top border */ 20px / 2));
background: red;
height: 40px;
left: 0;
right: 0;
}
</style>
<p>There should be no red.</p>
<div id=behind></div>
<fieldset><legend>X</legend>HELLO</fieldset>