[edent]

Yes. It's a W3C specification.

That said, the original 2001 version of the spec includes scripting https://www.w3.org/TR/2001/REC-SVG-20010904/REC-SVG-20010904... - so some decisions may be lost to time.

[WorldMaker]

My understanding was one of the goals for SVG+JS was an intentional need/desire to replace SMIL: https://en.wikipedia.org/wiki/Synchronized_Multimedia_Integr...

"Lost" standards can be fun rabbit holes sometimes.