I think you'd want to combine it with canvas to replicate Flash's cacheAsBitmap. As others have mentioned here though the decisions on where to use it (raster v

I think you'd want to combine it with canvas to replicate Flash's cacheAsBitmap. As others have mentioned here though the decisions on where to use it (raster vs vector) and where not to use it need to be made carefully as your map of bits uses memory [(width x height x 3 or 4 for RGB/RGBA) bytes - soon adds up but maybe browser renderers optimise this somehow] in exchange for what you save on drawing calculations. cacheAsBitmap brought a major performance boost to Flash when used wisely though. Maybe some libraries can handle this for you nowadays?