mikejuk writes "Until now the two standards bodies working on HTML5 (WHATWG and W3C) have cooperated. An announcement by WHATWG makes it clear that this is no longer true. WHATWG is going to work on a living standard for HTML which will continue to evolve as more technologies are added. W3C is going the traditional and much more time consuming route of creating a traditional standard which WHATWG refers to as a 'snapshot' of their living standard. Of course now being free of W3C's slower methods WHATWG can accelerate the pace of introducing new technologies to HTML5. Whatever happens, the future has just become more complicated — now you have to ask yourself 'Which HTML5?'"