Abuse of the language

<canvas onclick=for(n=u=v=0;n++<5e4;r<.2?r<.01?(u=0,v/=6):v=u/4+v/4+(r<.1?(u=u/5-v/4,38):(u=v/3-u/7,9)):u=u*6/7+v/25+(v=v*6/7+42-u/25,0))getContext('2d').fillRect(v,u+60,1,r=Math.random())>

Here it is as a data URI.

data:text/html;charset=utf-8,<canvas onclick%3Dfor(n%3Du%3Dv%3D0%3Bn++<5e4%3Br<.2%3Fr<.01%3F(u%3D0%2Cv/%3D6)%3Av%3Du/4+v/4+(r<.1%3F(u%3Du/5-v/4%2C38)%3A(u%3Dv/3-u/7%2C9))%3Au%3Du*6/7+v/25+(v%3Dv*6/7+42-u/25%2C0))getContext('2d').fillRect(v%2Cu+60%2C1%2Cr%3DMath.random())>

Copy/paste into URL box; click near upper left; wait a bit.