The Galaxy Hustle homepage is fully 3d using 3js. Some interesting facts: each planet is actually a voxel volume rendered using a custom raytrace shader.
This page also features sprite effects with on-card physics.
It can run well on top-end phones, but is resource intensive.
If ANGLE fixes a bug in rendering to 3D textures on direct3d, I’ll be able to run the planetary simulations and editing tool too!