<script language="javascript" type="text/javascript"></script>
I have never seen any other scripting language used on the web. Now this is out of curiosity, but are there any other languages besides JavaScript that are used on the web and are scripting languages? This might be a stupid question, but I have never seen any other languages used in the script tag.
Short answer? No. JavaScript or as it is properly known ECMAScript is the only client side scripting language available.
Long answer: Yes.
With plugins, people use ActionScript, Silverlight, and Java to create dynamic content.
Chromium also supports Dart, however Dart can be compiled into JavaScript and ran on any browser. CoffeeScript, like Dart, can also be compiled into JavaScript and ran in the browser.
The main reason that ECMAScript is the “only” client side language is that each and every browser has to implement their own version of the specification. This is why most vendors favour the use of plugins which enable their scripting language to run, rather than attempting to persuade browser vendors to implement a virtual machine for their language.