WebGL is not supported by any mobile browser yet (http://caniuse.com/webgl)
(edit: it seems that Blackberry Browser and Opera Mobile support WebGL. My bad, but it is not possible to use these browsers on iOS)
[1] http://www.zdnet.com/windows-phone-8-1-the-latest-on-whats-o...
That being said it is easy to OOM mobile browsers with textures.