Many many years before canvas was a thing (around 2011) I made a tiny tiny version of it on my domain and let people know about it with stumbleuponit.
At some time I decided to log the pixel changes and it seems, some had had fun with it. (They “played” Pong at some time.)
I made a bigger one (rgb color range) which sends its state to a 64x64 LED matrix sitting at home. Someday when we feel brave enough I will publish it’s URL ;)