Iterations in the Mandelbrot Set
Click anywhere and press Iterate.
As of 2018, Java plugins are not supported by any browsers (find out more). This Wolfram Demonstration, Julia Sets and the Mandelbrot Set, shows an item of the same or similar topic, but is different from the original Java applet, named 'julia'. The originally given instructions may no longer correspond precisely.
(image below from deprecated 'julia' applet)