Kendo - 2:17 am on Jul 6, 2012 (gmt 0)
The DOCTYPE can also affect W3 because the setting governs criteria. Anyway not many sites actually use it. In fact on most Google sites and services all you see is...
If you W3 validated most web sites they will fail. On our busiest site traffic didn't increase after spending 80+ hours validating pages and adding things like alt tags, etc.