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chromium/third_party/blink/web_tests/external/wpt/html/rendering/non-replaced-elements/the-fieldset-and-legend-elements/legend-position-relative-ref.html 

<!DOCTYPE html>
<title>Reference for legend position: relative</title>
<style>
div { display: inline-block; background: lime; }
.a { width: 100px; height: 200px; }
.b { width: 100px; height: 100px; }
.c { width: 200px; height: 200px; }
</style>
<p>There should be no red.</p>
<div class=a></div><div class=b></div><div class=c></div>