Notes from an Intro to Canvas, 8bitrocket, DevCon5 Firefox Canvas performance got really bad six months ago, slowly coming back now Retained mode (Flash, DOM) versus Immediate mode (Canvas) They still use Modernizr.js to test for Canvas support They end up creating (minimal) object system and re-rendering the whole scene at each frame You can do much of this with CSS, but for developers coming from other technologies, this is so much easier