Viewbox bug

[ibondrk]

Hello, i had a viewbox bug. On GitHub page doesn`t work viewbox.
Thats how my code looks localy:

<svg width="100%" height="100%" viewBox="0 0 100 100">
          <circle r="45" cx="50" cy="50"></circle>
        </svg>

and how it looks after deploy at GH:

<svg><circle r="45" cx="50" cy="50"></circle></svg>

svg tag attributes not working. Can u do something with it? Thanks in advance for your help