MDN is still the gold standard for web docs, but my understanding is that Mozilla fired most of the people responsible for it [1] and it's currently run as a joint project with funding from microsoft, google, and various other companies who contribute to it. the list of MDN advisory board members [2] is a good reference for what companies are actually leading MDN these days

[1] https://www.fastcompany.com/90539632/mozilla-vows-mdn-isnt-g...

[2] https://developer.mozilla.org/en-US/docs/MDN/MDN_Product_Adv...