Leadwerks Engine uses a deferred renderer and does not have MSAA. You can use the framework commands and enable antialiasing, but this is a post processing filter and does not have the same quality as MSAA.
Leadwerks3D supports MSAA, even with the deferred renderer, as the feature we requested three years ago is finally supported.
I have no plans to pursue WebGL, but there are other online platforms we are looking into. We'll probably end up supporting a variety of online platforms, because none are completely perfect, and each has tradeoffs.