I'm pretty sure some fellow students came into our computer room before that, "look now there even is a TK plugin for Mosaic!". it was not in "look it's like gopher but with a mouse!" days, but not that much later.
however you of course had to _do_ something to use it, while JavaScript came out of the box (once it was there).
https://sunsite.icm.edu.pl/pub/programming/tcl/plugin/
I'm pretty sure some fellow students came into our computer room before that, "look now there even is a TK plugin for Mosaic!". it was not in "look it's like gopher but with a mouse!" days, but not that much later.
however you of course had to _do_ something to use it, while JavaScript came out of the box (once it was there).