I really don't care what browsers do or don't implement. I only care that Apple doesn't allow other browsers to use their own browser engines on iOS. That's it, that's all, and it also got notice from the DOJ, which is one of many reasons Apple is getting sued by the DOJ.
Until Apple lets other browser engines on iOS, they are behaving like greedy tyrants.
> I really don't care what browsers do or don't implement.
Oh yes, you do. To the point of inventing contract clauses for Firefox.
It's just extremely unfortunate that Safari is now between a rock and a hard place (only because of Apple) as really they are the only web engine of note to withstand "whatever Chrome spits out is standard now"