[rlidwka]

Hmm... I wonder, if they put everything (both navigation and ads) on the same canvas (maybe pixel-by-pixel even), is there any way to block ads inside?

If webgl will be adopted widely enough, this might even look plausible for some.

[tomjen3]

Pixel by pixel would be unbeleavably horribly slow in WebGL - OpenGL is all about loading graphics and moving verticies.

I think I am getting what you are saying though, but functionally that would be the same as just rendering it server side and serve it as an image (if you write the pixels randomly you still have to use the correct coordinates) which is possible today, yet nobody is talking about doing that.

So as long as they are still going to be rendering text client-side we can filter it. The moment they are not, we will have to start analysing the image, which should be fairly straight forward (ads are going to be in a rectangular area at least 20x20 pixels; text is going to a lot smaller and in ugly shapes).