I think that's already a feature of HTML, using the language="..." attribute of the script tag. Believe it or not, a long time ago, Javascript was actually the

I think that's already a feature of HTML, using the language="..." attribute of the script tag. Believe it or not, a long time ago, Javascript was actually the less bad option in web scripting. IE used language="vbscript" to allow web scripting in VBScript, which, AFAIK, was the only other language that became popular for scripting web pages.