An EPUB Content Document conforming to the constraints expressed in SVG Content Documents [ContentDocs301]. (idpf.org)
Many of my featured paper craft projects are created using a Cricut Explore Machine with free SVG files for Cricut users and Free Printables here. (simplemadepretty.com)
Although an EPUB Publication typically uses XHTML Content Documents as the top - level document type, the use of SVG Content Documents is also permitted. (idpf.org)