ken_b - 10:35 pm on Mar 27, 2013 (gmt 0)
It has nothing to do with pinterest.
Except that that's where the NoPin tag came from. They publish it in that form as the NoPin option
If I had to choose between validating and allowing pinning, I'd give up on validating. That's why I'd like to know if the tag will still work if I alter it.
I'll use the version Doctype that you posted.