rocknbil - 4:20 pm on Sep 16, 2011 (gmt 0)
It's just a waste of time.
Interesting position, considering that 1) standards compliance mode is the first stop to cross browser compatibility without hacks and IE conditionals, and 2) by beginning with a validated output, you can spend a lot less time sorting out rendering issues. If your page doesn't validate, it will render in Quirks Mode, and you will **definitely** see cross browser differences. Without validation, you have a bunch of patches and fixes piled on top of other patches and fixes and it just makes your work more difficult.