What is the difference between “lang” and “type” attributes in a script tag?

Question

For

Answer 1

The OP specifically said "lang" not "language". The much older "language" tag would have been Javascript or VBScript.

But the current and seemingly valid "lang" tag is actually which written language like English, Spanish, Japanese. Microsoft's Visual Studio provides a dropdown list for the values for "lang" and they are all like en-us, fr, ja, etc.. for English US, French, Japanese, etc...

I'm thinking there could be valid reasons for using this tag if you have a complex multilingual setup - maybe there's a content mgmt system that could support this and then deliver the proper javascript file - like jQuery control resources?