WebGL has events for loss and restoration of a context and creation failure error. However, there's a problem with them: sometimes they're not very helpful.

For instance, webglcontextlost event. Since it doesn't give the reason why we've lost the context, it's not clear what to do: show our user an error message or wait for restore event. I actually tried to log statusMessage property of event objects and it was empty.

It'd be good to have better specified context events.