WebGL is not just for 3D: it can be used for 2D games, where it is way faster than ordinary canvas2d, and allows use of shader effects and such. Major web game

WebGL is not just for 3D: it can be used for 2D games, where it is way faster than ordinary canvas2d, and allows use of shader effects and such. Major web game engines like Construct 2 [disclaimer: I am developer] use WebGL rendering with effects, and fall back to canvas2d if WebGL is not supported. So at least with Construct 2, it's been in commercial production use for a couple of years already.