I don't know why people would make web applications that entirely depend on canvas + js instead of using flash because it just shrinks your potential userbase d

I don't know why people would make web applications that entirely depend on canvas + js instead of using flash because it just shrinks your potential userbase due to the number of IE users out there. In contrast flash player is installed on like 99% (?) of all computers out there. Until HTML5 gets wide-spread adoption I guess.