There's a very high interia, as there are at least 5 major implementations still being developped (MSIE's Chakra, Mozilla's SpiderMonkey, Google's V8, Apple/Webkit's JavaScriptCore and Opera's Carakan).
Work has not stopped, but it's basically about cat-herding, and each player does his own additions. As an example, Mozilla has kept working on core Javascript with "internal" versions:
1.6 added Array Extras and String and Array generics (array extras have since then been adopted by everybody else) as well as E4X (literal XML syntax in JS) and a `for each` loop.
1.7 added generators and iterators, array comprehensions (listcomps), let definitions, statements and expressions and destructuring assignments
1.8 added a function shorthand (function (foo) { return bar; } => function (foo) bar), generator comprehensions (lazy listcomps) and two missing array extras (left and right folds)
1.8.1 and 1.8.5 mostly added ES5 and draft APIs (e.g. the Object.* stuff and the Proxy type)
Work has not stopped, but it's basically about cat-herding, and each player does his own additions. As an example, Mozilla has kept working on core Javascript with "internal" versions:
1.6 added Array Extras and String and Array generics (array extras have since then been adopted by everybody else) as well as E4X (literal XML syntax in JS) and a `for each` loop.
1.7 added generators and iterators, array comprehensions (listcomps), let definitions, statements and expressions and destructuring assignments
1.8 added a function shorthand (function (foo) { return bar; } => function (foo) bar), generator comprehensions (lazy listcomps) and two missing array extras (left and right folds)
1.8.1 and 1.8.5 mostly added ES5 and draft APIs (e.g. the Object.* stuff and the Proxy type)