<!DOCTYPE HTML> <html class="reftest-print"><head> <meta charset="utf-8"> <title>Testcase for bug 1102791</title> <style type="text/css"> html,body { color:black; background-color:white; font-size:16px; padding:0; margin:0; } button { position: absolute; -moz-appearance: none; background: transparent; padding: 0; border-style:none; } button::before { position: absolute; content: "::before"; width: 10px; height: 200em; border: 1px solid black; } </style> </head> <body> <button></button> </body> </html>