Just thought this was funny:
Vacature front-end developer bij Basic Orange (Amsterdam) · Fronteers
Basic orange, if you scroll down a bit to the Skills section, wants someone who can do HTML4/5 and CSS3/4.
Damn, I’m so underqualified.
Maybe they meant HTML 0.8 and CSS 0.75? 
Well I’ve heard/seen plenty of people talking about HTML6… I’m just not sure what they mean by that exactly 
But this is the first time I’ve seen CSS4. I’ll bet it’s 3-D.
CSS4 incorporates a direct thought-to-code engine.