I've noticed quite a few rants against html5 and css3, coming from members I admire and whose advice I follow without second thoughts.
Yet all the critics were kept in some kind of mist.
I was wondering what exactly bothers people about html5 and css3. I'm not asking for a justification of any kind, just your subjective, personal angle.
I'm not aware of problems with CSS3. The only real problem is that it's not ready for use in most regards. Vendor prefixes are pretty ugly, but I personally don't mind using them.
HTML5 is also nor ready for use; so using a JS life-support system is a little contrary to a lot of accepted standards. That's not a complaint about HTML5 per se, though.
I'll let others detail HTML5 concerns. But as a general comment, some folks don't like to see applications mixed with HTML, which is supposed to be a markup language only. I'm not too keen on the structure of 5 (it's quite confusing and not very intuitive, such as sections within sections, H1s in each section, and confusion over where to use <footer> etc.). I can see the point of it all, but fear that it will be too easy to muddle up and get wrong.
I'm not convinced by elements like <nav>. Personally I prefer an approach like that taken by ARIA, where you assign a role to an element.