Yeah, I meant web workers. It's easy to find canvas and web workers in any sufficiently complex highly interactive web app. I'm not saying you always find them,

Yeah, I meant web workers. It's easy to find canvas and web workers in any sufficiently complex highly interactive web app. I'm not saying you always find them, but if you're doing some form of graphics you most probably use canvas at some point, if you do non-trivial computation you spawn workers, if you need sound you use the Web Audio API, if you have a complex layout you're better off with DOM Observers, and so on...