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Re:CamelCase vs. Underscores: Revisited by int_19h on Wednesday January 25, 2023 @07:06PM (#34526057)
It is (was?) the default for XSLT and XQuery, if we're talking about something relatively mainstream. Beyond that I can think of Dylan and REBOL.
Re:CamelCase vs. Underscores: Revisited by capableweb on Thursday January 26, 2023 @03:18AM (#34529100)
CSS is probably the most mainstream language allowing dashes in names.
Re:CamelCase vs. Underscores: Revisited by int_19h on Thursday January 26, 2023 @03:40AM (#34529239)
Depends on whether you count all the serialized data on the wire or not; if you do, it's probably XML. ~

But I think OP meant programming languages, not styling or markup.

Re:CamelCase vs. Underscores: Revisited by gpderetta on Thursday January 26, 2023 @06:24AM (#34530376)
Everybody forgets about shell scripts! Bash allows dashes in executable names (how it couldn't) and in function names, but not in variable names, at least not without a lot of effort.