WebGL Support

[mseddon]

I'm just working on bindings for https://www.khronos.org/registry/webgl/specs/1.0/ (it's not up yet, but should be done by the end of the weekend). Would it be worth merging it into scala-js-dom?

[lihaoyi]

I'd say it could go in the same project, since you can get to it via canvas.getContext. What do you think @sjrd?

[sjrd]

Yes, I believe it should be available in this lib.