I am a Master student in Computer Science and hobbyist web developer, experienced in html css3 js regex php python c++ and a beginner in svg and some more obscure languages, although I basically understand most C-like languages. I like to think outside the box to find alternative uses for existing features, such as with my CSS3 mineturtle, or with this supposedly impossible question.
I came up with CSS3 :checked
-based tab menus independently in 2011 (back when IE8 was still by far the most used browser).