<!DOCTYPE HTML> <html><head> <meta charset="utf-8"> <title>Testcase for bug 1178575</title> <style type="text/css"> html,body { color:black; background-color:white; font-size:16px; padding:0; margin:0; } div { position: absolute; left: 0; right: 0; box-shadow: 0 0 0 10px rgba(0, 255, 0, 0.5); margin-top: 10px; height: 3em; } </style> </head> <body><div></div></body></html>