<!DOCTYPE HTML> <title>Testcase, bug 514917</title> <style type="text/css"> body > div { overflow: auto; /* to detect too much overflow, which is the bug here */ width: 200px; height: 200px; } body > div > div { width: 100px; height: 100px; box-shadow: blue 50px 50px; } body > div > div > div { width: 160px; height: 160px; border: medium solid; } </style> <body> <div><div><div></div></div></div> </body>