WebGL - not supported

Unfortunately your browser does not support WebGL ,
possible reasons:

try updating your video card driver to the latest version:
Intel, NVidia, AMD.

please upgrade your browser or try to use one of the most popular:
Google Chrome, Firefox, Microsoft Edge

please update your iPad to iOS8.

please update your OS to OS X Yosemite
or try to use a different browser, for instance: Google Chrome, Firefox.

currently the standard Android browser has limited support of WebGL technology so it's better to use: Google Chrome.