[perilunar]

Browsers will render SVG files. SVG files can link to other SVG files. Just need to configure the server to serve SVG by default — most servers don't but it's an easy config change.

[perilunar]

Actually just found one, via an old stack overflow post. Only a three page test, but proves the point:

https://svg.nicubunu.ro

[pcthrowaway]

No javascript here though