The WebGL Extension EXT_color_buffer_float moved to draft and may now be implemented: https://www.khronos.org/registry/webgl/extensions/EXT_color_buffer_float/
Firefox: https://bugzilla.mozilla.org/show_bug.cgi?id=1129332 Chrome: https://code.google.com/p/chromium/issues/detail?id=455130 IE: https://connect.microsoft.com/IE/feedback/details/1114829 ANGLE: https://code.google.com/p/angleproject/issues/detail?id=907
Implementation is already complete on ANGLE's side.
This extension was finally implemented in Bug 210994. *** This bug has been marked as a duplicate of bug 210994 ***