Ip’s.

"It’s astounding how many web designers forget to specify a background color on their site. They’ll spend months iterating wireframes and design comps; write CSS hacks for browsers predating this century; test their work on everything from Blackberries to old Macs running System 7; and of course they’ll validate their markup and style sheets. But after all that, they’ll forget to apply a background color to their site, and they won’t think to check for it."