badbadmonkey - 5:21 am on Jun 4, 2011 (gmt 0)
So, for those of you who maintain valid XHTML code, this will present challenges. You may be forced to switch to an HTML5 DOCTYPE so that you can take full advantage of all things HTML5 and maintain valid documents.
And the Facebook OpenGraph tags don't validate in HTML5.
Nice to see these forward thinking orgs care so much about little things like standards.