Just for curiosity
Is there at least one (1) page from Google that is not full of html/js/css errors? Can you link them? I know they need to hack html to make it look nice and so on, but just a little bit of standard should be.

Just as example:
The GMail Inbox has 2037 warnings

I can't get zero errors but I can get close.

labs.google.com/faq.html is a page that looks ugly.

It has:

validator.w3.org/check?uri=htt ...

12 errors.

I know.

google.com/url?q=w3.org/

I've forwarded this to the front-page, the thread is now continued here:
blogoscoped.com/forum/22277.ht ...