I'm not sure if I understand the concern; for clarity, I'm just making a general comment about the state of contributing AI to open-source software related to resvg, not related to QGIS itself. svg2 spec says css geometry attributes only support cartesian coordinates.

Ah gotcha, thanks - I know next to nothing about css geometry itself, but was curious to play with it, and think I had an imagine in my mind that was different to what you've created.

For what it's worth, I just skimmed the MDN docs and e.g. DOMPoint is using the right kinda wording to sound like it's not inherently cartesian-only. Could be interesting, that. Thanks for getting it into my head!