Edwardson Tan explains the Alternate Box Model Hack.
background: red url(bg.gif) no-repeat center center; /*100x100px*/
padding: 0 25px;
width: 100px !important;
width /**/: 150px;
This often used, well known hack is assuming that modern browsers would properly implement
IE7b2, like older IE, still ignores that
!important within the same rule. MS has fixed the /**/-comment bug. Therefore, the
width:150px is applied in IE7b2, like IE5.5/ IE6 in quirks mode, but with the modern box model. Padding is added, this results in a width of 200px.
Feb. 3, 2006. Ingo Chao