Manual:Assets

MediaWiki includes some binary assets in its code.

PNG images
PNG files are needed for browsers without SVG compatibility.

All PNG images/icons included in our code are usually optimized with optipng.

SVG files
Every image should exist also (or rather, primarily) in SVG format.

SVG files need to be optimized as well. For most core files, svgo was used, but you need to make sure a compatible prolog is kept, for instance with this snippet: