Your browser doesn't support Canvas, get a real browser. Mozilla's Firefox is great.

A basic implementation of Conway's Game of Life in HTML5, use mouse and click on the canvas to trigger cells or use WASD/ZQSD + Enter (better precision). Activate the calculation by setting the timer with the below form (and stop it before drawing or you'll see nothing) or use the Step button to see the changes step by step. You can change the dimension of the canvas with the second form.