The WebGL extension WEBGL_compressed_texture_es3 has moved to draft status and may now be implemented. Specification: https://www.khronos.org/registry/webgl/extensions/WEBGL_compressed_texture_es3/
Firefox: https://bugzilla.mozilla.org/show_bug.cgi?id=1129803 Chrome: https://code.google.com/p/chromium/issues/detail?id=455568 ANGLE: https://code.google.com/p/angleproject/issues/detail?id=908 IE: https://connect.microsoft.com/IE/feedback/details/1116140