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and that it will be compatible with whatever Google decides to add to theirsThere are plenty of respectable people who maintain "home pages" with much simpler HTML than what is possible, and news.ycombinator.com gets a lot of love for keeping its classic look.
All this to say, I'd like if the people who have a lot of overlapping agreement on this would agree on a subset to use, and I'd be happy with a browser that didn't do everything google's did.
I run with uMatrix which shuts off a lot of google functionality, and I never whitelist google.com domains just to prove that I don't have to, the world doesn't end. It's a relatively small number of sites that just won't work.