About
In the past ten years, there has been a large movement in industry toward web browser based applications and away from native desktop programs. This is due in large part because of the inherent cross-platform nature of in-browser applications. As a part of this movement, numerous open source libraries have been developed that provide functionality that has been available in other languages such as C/C++ for quite some time. While several libraries have covered important areas such as 3D graphics (three.js) and collision detection (ammo.js), there is not a widely used motion planning library to the best of my knowledge.
Porting OMPL
Porting OMPL with Emscripten is very difficult due to a dependence on boost_thread.
Porting MSL
Porting MSL with Emscripten is much easier because of the project's structure and lack of thread use.