<!DOCTYPE HTML> <html><head> <meta charset="utf-8"> <title>Testcase for bug 1226278</title> <style type="text/css"> fieldset { overflow-clip-box: content-box; overflow: hidden; padding: 20px; background: url(data:image/gif;base64,R0lGODlhAQABAIABAAD/AP///ywAAAAAAQABAAACAkQBADs=) content-box; height: 20px; } div { margin-top:20px; height:40px; background:red; } </style> </head> <body> <pre>There should be no red areas.</pre> <fieldset><legend>LEGEND</legend><div>FAIL</div></fieldset> <fieldset><div>FAIL</div></fieldset> </body> </html>