Webkit's FTL JIT is moving away from LLVM in favour of a custom SSA backend:
miniblog.
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It's funny how webkit-based browsers account an increasingly large proportion of users, but there's no similar trend in JS engines.
The JS implementation space seems to be much more diverse, at least in browsers.
Microsoft's Edge moving to Chromium will reduce browser diversity. However, Safari/WebKit has forked from Chromium. Presumably they'll diverge over time?
Browser vendors influence *new* standards, and both Apple and Google will need to do implementation work.
Tons of hobby operating systems exist, but hobbyists have built browsers too.
*Emacs has eww
*Webkit and Chrome were both born from KHTML, a FOSS project
*Servo started as a small research project