2D Context and WebGL are two separate things. WebGL (and GLSL) are way more powerful and allow to render 3D environments (QuakeII in the browser without plugin ? sure, why not.)
Working with GLSL can be a real hassle and I don't know any abstraction to avoid that. However, performance wise, shaders are incredibles.
That's what I thought, so is 2d still GPU?
It must depend of the browser, but I'll say yes it is. Not sure tho
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