> Efficient 2D using OpenGL is very difficult. It depends on what you are doing. Rendering thousands of sprites with independent rotation and scale is easy.

> Efficient 2D using OpenGL is very difficult. It depends on what you are doing. Rendering thousands of sprites with independent rotation and scale is easy. Rendering text is a lot of work, but once you do it you can do all sorts of things with the text. Rendering simple things like bezier curves is very difficult. There are some things in the 2D world that HTML/CSS/GDI/GDI+ are very bad at, compared to OpenGL, and vice versa.