[DelTaco]

JavaScript does allow commas at the end of a list! :)

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Refe...

[kijin]

Not if you want your code to work in certain versions of Internet Explorer :(

[coldtea]

Nobody (1) cares for those versions of IE anymore.

(1) where nobody = limit(somebody) -> 0