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Re:WebML: A Standard ML Compiler for the Web by Athas on Sunday March 08, 2020 @04:06PM (#22520229)
None of these are Standard ML! There are people who prefer SML for various reasons.

Somewhat unexpectedly, there is in fact already a very good SML-to-browser solution, namely the unfortunately named SMLtoJs: https://github.com/melsman/mlkit/blob/master/README_SMLTOJS....

It's from 2011 and so predates most other Javascript-targeting languages. It's unfortunate it never got any traction.

Re:WebML: A Standard ML Compiler for the Web by eatonphil on Sunday March 08, 2020 @05:26PM (#22520726)
SOSML [0] came out recently, written in TypeScript and sporting an online interpreter. Then there's this prominent SML-er's JavaScript backend for Moscow ML [1]. And Andreas Rossberg's HaMLet [2] also has a JavaScript backend.

[0] https://github.com/SOSML/SOSML

[1] https://github.com/kfl/mosml-js

[2] https://people.mpi-sws.org/~rossberg/hamlet/