data:image/svg+xml, none-base64 browser support
<p>that is pretty old theme, but I could not find source of information which could cover it in a simple way, I see couple of hacks and methods how to make it work with IE. 
As far as I see IE9 had issues with that, but since its support is not mandatory for me, I want to still be able to use it and to have capability to 'redraw' my svg icons via CSS. I want to use none encoded svg in my mobile site version.
What about other browsers? I can check in Edge and it seems it is doing just fine with simple <code>background:url("data:image/svg+xml,&lt;svg xmlns='http://www.w3.org/2000/svg'</code> etc. Are there still problems left on mobile browsers with such approach? I mean lack of support.</p>