User:Mbear/SVGTest
relevant file is 4000px square.
setting width automatically scales height as appropriate (apparently)
CSS background image? From https://www.mediawiki.org/wiki/Extension:CSS {{#css: body { background: url("warhammer.jpg") no-repeat center; background-image: url("bb.svg"); background-size: contain; } }} Doesn't work either.
HTML test
<a href="map.svg"></a>