for doing javascript calculations; Opera, Safari, and Chrome are considerably faster than Firefox and IE9
(assuming that the latest version of each browser is used)
drag mouse in either canvas to zoom in
click anywhere on the Mandelbrot set to get a new point for generating a new Julia set
(-0.6 , 0.6)
pick a colour↓
the generated Julia set "resembles" the region of the Mandelbrot set at which the Julia-point is picked
...for one page