That was the tipping point of Opera and IE/Edge too. Opera 12 had various methods to emulate other browsers behaviours and compatibility domain-lists, in the en

That was the tipping point of Opera and IE/Edge too. Opera 12 had various methods to emulate other browsers behaviours and compatibility domain-lists, in the end Opera 12 died and the next version, Opera 15, was just a fork of Chromium. IE/Edge feels pretty broken in modern web similar to Opera 12 back then. The question is were is webkit/Safari is this game. Most website have stylesheets that mention webkit prefixes, and it's now clear why Google removed the prefixes from their webkit fork (blink). It's bad for the end user and the web devs, but good for them.