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A peek into a possible future of Python in the browser - Łukasz Langa
(lukasz.langa.pl)
This is a most excellent place for technology news and articles.
I think if the idea is to replace js, it should be a superset language at the interpreter level. I.e. the interpreter can run js, but valid js wouldn't work with the compiler. It makes it a drop-in replacement without harming legacy
WebAssembly is the target, not js, I believe.