That's a great idea! Although, you know the Dev tools has a canvas inspector built-in? Check out chrome://flags and enable the "Enable Developer Tools experimen

That's a great idea! Although, you know the Dev tools has a canvas inspector built-in? Check out chrome://flags and enable the "Enable Developer Tools experiments.". Pop open the console and then Settings (bottom right corner cog) > Experiments > Canvas inspector. This enables the ability to profile a canvas and view the different states between draw functions. It's really nifty.