[krapp]

IIRC, the only actual browser scripting language competitor to Javascript at the time was Microsoft's VBScript, and that probably would have won. There was never really a third option on the table, just "what Microsoft did" and "something else."

[pjmlp]

Actually there was, you could use Perl and Python as well via browser plugins. ActiveState used to develop them.

[jhayward]

It would probably have been FutureSplash Animator, which became Macromedia Flash and then Adobe Flash. For a long time Flash was the de-facto web scripting language.

[thaumasiotes]

Flash is scripted with a language eerily similar to JavaScript -- so similar that I assumed it was derived directly from JavaScript. In the hypothetical world where JavaScript was lisp... wouldn't Flash use that?

[jhayward]

I think you're probably referring to Actionscript, which came much later in Flash's evolution and was indeed very much similar to javascript.