Hey @Deltakosh
The latest 2.6 alpha now gives a BUNCH of error when using HDRCubeTexture:
[.Offscreen-For-WebGL-0x7fc2bf02b800]RENDER WARNING: texture bound to texture unit 0 is not renderable. It maybe non-power-of-2 and have incompatible texture filtering.
Sorry... Correct it crashes when being deserialized (also with 2.5)
You can download the whole build folder (with the scene file, index page and all textures) at Samples Build Folder