SetCursor WebGL doesn't work

Hi, Im trying to change texture2D on Mouse Cursor, after click on UI Button. It’s working in my Unity Editor, and when i build my project on standalone works too, but when i build my project on WebGL, setCursor doesn’t work.
Somebody help pls?
Unity 5.1.0f2

Thanks Tomas

Still the same problem with Unity 5.3.2, but set CursorMode to CursorMode.ForceSoftware. That helps!