<!doctype html>
<title>fieldset border gap</title>
<link rel=match href=fieldset-border-gap-position-relative-ref.html>
<style>
fieldset, legend { margin: 0; padding: 0; }
fieldset { border: none; border-top: 100px solid red; width: 100px; }
legend { width: 100px; height: 50px; background: lime; }
</style>
<p>There should be no red.</p>
<fieldset><legend></legend></fieldset>