It sounds cool but given that the demo looks like this [0] on my bog-standard Windows 10 PC with Chrome (and Firefox and Edge) I'm assuming they've still got some bugs to work out... If it's working for anyone here I'd love to see a screen capture of the proper rendering.
Aha. Reminds me of what I saw for two weeks when I wrote an svg renderer in MATLAB. I only got it to work with a subset of the standard and was reliant on the conventions of inkscape export for parsing. You can do a lot with just beziers, circles, and straight lines.
Interesting, maybe it's missing a coordinate, could it be missing the repeating first coordinate? Surprising to see that surfaces of the same color are made up so many polygons, I guess that can be made even more efficient?
[o]: https://i.imgur.com/YO42u2C.png