Start from 'working'
A few years back Microsoft tried to lead a multi-
vendorsteward effort at consolidated documentation of 'web', WebPlatform.org. Unfortunately the consolidation started with a straight dump from Microsoft's web documentation. And remember, they didn't get 'web' for a long time. It was lacking, lack-luster and often wrong.
Somehow they got a clue and dumped it onto Github, after declaring the effort 'discontinued' sometime post-2015. That was actually a good illustration that things _are_ getting more real at Microsoft re: 'web'. (Unbelievable but true)
If Microsoft are now linking to MDN for web apis it is only further recognition of bad their own docs were. Another (amazing) instance of getting more real. Cue glaciers in hell...