Comment by chrismorgan

I’m not certain, but I think Firefox just implemented 3D transformations for SVG from the start. It wasn’t exactly hard to conceive. Certainly by mid-2017 it had it. Somewhere around that time there was also concerted effort toward aligning SVG and CSS.

(Firefox’s implementation does still suffer from one long-standing bug which means you want to make sure your viewbox unit is larger than one device pixel, but that’s normally not hard to achieve. https://oreillymedia.github.io/Using_SVG/extras/ch11-3d.html... shows what it’s about. I don’t really understand why that problem isn’t fixed yet; what I presume is the underlying issue affects some HTML constructs too when you scale things up, and surely it’s not that rare? I know I found one such problem a decade ago (and, being in HTML, it couldn’t be worked around like you can with SVG). They’ve improved things a bit, but not entirely.)

Sadly, no one else seemed all that interested in making 3D transformations work properly in SVG content.