How about on mobile via cocoon? How well is it likely to perform given how minimalist you need to be with the sprite counts?
Do all the elements count as individual objects or do they get stitched together and stored in memory temporarily? For example, if I wanted to use it to dynamically create words from PNG letters, would a 5 letter word count as 5 sprites or be held in memory as 1 sprite?
Not being proficient in javascript, I've always wondered whether it is possible to stitch images together (efficiently)on the fly to count as 1 image (in the way you can with GD functions in PHP), or whether that's just how the system deals with rendering static images anyway.