Author here. Glad you like it.
> data-x attributes will destroy your W3C validator checks. Use them if that's not important. (sometimes it just is...)
Are you sure that is still the case if you have the HTML5 doctype?
> data-x attributes will destroy your W3C validator checks. Use them if that's not important. (sometimes it just is...)
Are you sure that is still the case if you have the HTML5 doctype?
It'll probably be finalised by 2014. I don't get the down votes, if you don't agree then why not ask/explain why ?
Also, as we all know by now, XHTML doesn't make any sense with the browsers that exist – particularly as it's rarely actually valid XML, and even rarer, sent with the right MIME.
In short, XHTML doesn't exist in any practical sense and HTML5 subsumes HTML4 + modifying the stupid bits to fit with what browsers actually do. There isn't really any logical reason to not use HTML5 syntax, though of course, using the new features can be problematic.
I understand that your logic for validating is likely your companies decision and not your own view, and I'm not attacking your values or opinions in anyway.