I thought the WordPress Default Theme (unmodified) should validate?
Line 34, Column 23: Attribute "role" is not a valid attribute. Did you mean "frameborder" or "scrolling"?
<div id="header" role="banner">
I know why this error is occuring (because role isn't part of the XHTML spec), so why is it included in the default theme, surely this theme should validate seeing as it is the default theme?