I've written so much in JS I don't even know where to begin. It is still to this day my favorite quirky little language. I'm current with most of the new APIs...
HTML/CSS15 years experience
Albeit not the best designer alive, I have an eye for QA. I also know a lot about the semantic side of HTML and what is possible today with CSS.
Html5 canvas3 years experience
mostly just learning and doing demo's. Been pretty interested in the performance impacts and possibilities of this new technology.