<!-- Any copyright is dedicated to the Public Domain. http://creativecommons.org/publicdomain/zero/1.0/ --> <!-- This testcase has a relatively-positioned -moz-box element, which should form a containing block for its absolutely positioned child. Also: in this case, the child is taller than its container. --> <html> <head> <style> .box { display: -moz-box } .relpos_parent { position: relative; width: 100px; height: 100px; background: lightblue; } .abspos_child { position: absolute; left: 30px; top: 10px; width: 20px; height: 150px; background: purple; } </style> </head> <body> <div class="box relpos_parent"> <div class="abspos_child"></div> </div> </body> </html>