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by path411 4390 days ago
I tried doing this:

http://jsfiddle.net/path411/sRkWq/

It appears as though Chrome (37-dev) will not receive any data from behind the canvas, while IE11 and FF(29) will allow me to see pixels behind the canvas, but only see the unvisited color.

I don't believe there is another method to receive the color of a pixel from a canvas except through getImageData(), but I could be wrong.