Where can I find a tile engine for HTML5 , for writing 2D games?
Possibly: http://www.effectgames.com/effect/ and in particular http://www.effectgames.com/effect/#Article/docs/Sprites_and_Tiles_Guide However note that effect is free to use but proprietary and not open source.
Other Javascript/Canvas game engine libraries that would make it easy (but may not have specific tile support/documentation):
Sites you might want to follow: