SVG as source in <img> tag not displaying in Internet Explorer 11

I've found the problem. I was viewing the page over intranet, and I'm not sure why, but IE's default setting is to "display intranet sites in Compatibilty View". Just had to untick that box in compatibility view settings. SVG doesn't work at all in IE7, so that's why I was getting no image.

I have found that having a style of "width" on the img (to scale it down) works in Edge and Chrome, but makes it disappear in IE11. Rather setting both "max-width" and "max-height" seems to work in all three of those browsers.