Re:JavaScript once had a JSX-like syntax called E4X
by oomkiller on Saturday March 18, 2017 @01:37PM
(#13902443)
If you've ever used Mirth[1] then you've used E4X, for better or worse (usually the latter). It's still used very heavily inside of the transformers, even though Mozilla deprecated it years ago.
[1] https://www.mirth.com/