<html> <head> <style> div.box { height: 100px; width:100px; background-color:red; display: -moz-box; display: -khtml-box; display: box; position: relative; } div.block { width: 100px; height: 100px; bottom: 0px; right: 0px; background-color: green; position: absolute; } </style> </head> <body> <p>You should see a 100x100 green square below. If you see any red, then the test has failed. This test is ensuring that boxes can act as containing blocks for positioned elements. </p> <div class="box"><div class="block"></div></div> </body> </html>