A bit of qualification
Yes everyone is aware SVG is the laggard. The SVG working group has just (yesterday) been rechartered with a slightly different goal, which is to do things the way CSS does it: multiple independent implementations, and a testsuite to back them up. The existing testsuite is poor and interop for some of the more obscure features is bad. So this is a very good thing.
But I wanted to point out that all the companies listed are already working together, in the same working groups, on the same testsuites. This is about a push to drive adoption of the newer features that have less coverage - cascade layers, grid-2, color-5, the "lvh" unit or whatever it's being called today. These are all new things that didn't exist anywhere a couple of years ago.
So yes this is good, but 'best viewed in X" hasn't been the case for years because this cooperation is already happening, and because there are tests. Thousands and thousands of them: https://wpt.fyi
Biting the hand that feeds IT
