Know the JavaScript Version.

[dmjpro]

How do I get JavaScript version supported by working Browser?

[acoder]

You don't need to know the JavaScript version number. Just check for the support of objects/properties/methods before you use them.

[dmjpro]

Yeah i know but ... how do i know which version of JavaScript i am using ;)

[Dormilich]

why does it matter?
(...)

[dmjpro]

If i make any documentation then i should mention the version i am using ;)

[acoder]

That's not required really and although browsers claim support for a version number, not everything is supported and sometimes even basic older version parts are not supported properly. Just put down the assumptions you make and the browsers you've tested on.