Please note that some of these tests represent existence, not functionality or full conformance. I hope to test conformance sometime in the future.

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IE 7 IE 8 IE 9 FF 3 FF 3.5, 3.6 FF 4 FF 5 FF 6 FF 7-11 FF 12 SF 3.2 SF 4 SF 5 WebKit CH 7-10 OP 10.10 OP 10.50-11.10 Konq 4.4 Konq 4.9 BESEN Rhino 1.7
function statement">function statement">§function statement Yes Yes Yes Yes Yes Yes[1] Yes[1] Yes[1] Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes[2] Yes
§uneval No No No Yes Yes Yes Yes Yes Yes Yes No No No No No No No No No No Yes
§"toSource" method No No No Yes Yes Yes Yes Yes Yes Yes No No No No No No No No No Yes Yes
§function "name" property No No No Yes Yes Yes Yes Yes Yes Yes No Yes Yes Yes Yes No Yes Yes Yes Yes Yes
§function "caller" property Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes No Yes Yes Yes No No
§function "arity" property No No No Yes Yes Yes Yes Yes No No No No No No No No No No No No Yes
§function "arguments" property Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes No Yes
Function.prototype.isGenerator">Function.prototype.isGenerator">§Function.prototype.isGenerator No No No No No No Yes Yes Yes Yes No No No No No No No No No No No
__proto__">__proto__">§__proto__ No No No Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes No Yes Yes Yes Yes Yes
__count__">__count__">§__count__ No No No Yes Yes No No No No No No No No No No No No No No No No
__parent__">__parent__">§__parent__ No No No Yes Yes No No No No No No No No No No No No No No No Yes
__noSuchMethod__">__noSuchMethod__">§__noSuchMethod__ No No No Yes Yes Yes Yes Yes Yes Yes No No No No No No No No No No Yes
__defineGetter__">__defineGetter__">§__defineGetter__ No No No Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes No Yes
__defineSetter__">__defineSetter__">§__defineSetter__ No No No Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes No Yes
§const No No No Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes No No No No
§let No No No Yes Yes Yes Yes Yes Yes Yes No No No No No No No No No No No
§Array generics No No No Yes Yes Yes Yes Yes Yes Yes No No No No No No No No No No Yes
§Expression closures No No No Yes Yes Yes Yes Yes Yes Yes No No No No No No No No No Yes No
§e4x No No No Yes Yes Yes Yes Yes Yes Yes No No No No No No No No No No Yes
Sharp variables">Sharp variables">§Sharp variables No No No Yes Yes Yes Yes Yes Yes No No No No No No No No
§RegExp "y" flag No No No Yes Yes Yes Yes Yes Yes Yes No No No No No Yes No No No No No
§RegExp "x" flag No No No No No No No No No No No No No No No Yes Yes No No No No
§RegExp "lastMatch" Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes No Yes Yes Yes No Yes
§RegExp.$1-$9 Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes No Yes
§Callable RegExp No No No Yes Yes Yes No No No No Yes Yes Yes No Yes Yes Yes No No No Yes
§RegExp named groups No No No No No No No No No No No No No No Yes Yes No
§String.prototype.substr Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes
§String.prototype.trimLeft No No No No Yes Yes Yes Yes Yes Yes No No Yes Yes Yes No No No Yes No No
§String.prototype.trimRight No No No No Yes Yes Yes Yes Yes Yes No No Yes Yes Yes No No No Yes No No
§String.prototype.anchor Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes
§String.prototype.big Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes
Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes
§String.prototype.bold Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes
Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes
§Object.prototype.watch No No No Yes Yes Yes Yes Yes Yes Yes No No No No No No No No No No No
§Object.prototype.unwatch No No No Yes Yes Yes Yes Yes Yes Yes No No No No No No No No No No No
§Object.prototype.eval No No No No No No No No No No No No No No No No No No No Yes No
§Octal literals Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes
§error "stack" No No No Yes Yes Yes Yes Yes Yes Yes No No No No Yes No Yes No No No No
§error "lineNumber" No No No Yes Yes Yes Yes Yes Yes Yes No No No No No No No No No No Yes
§error "fileName" No No No Yes Yes Yes Yes Yes Yes Yes No No No No No No No No No No Yes
§error "description" Yes Yes Yes No No No No No No No No No No No No No No No No No No
Proxy">Proxy">§Proxy No No No No No Yes Yes Yes Yes Yes No No No No No No No No No No No
WeakMap">WeakMap">§WeakMap No No No No No No No Yes Yes Yes No No No No No No No No No No No

[1] From Firefox 4 on, function statements in strict mode functions are only accepted at top level or immediately within another function.

[2] With 'Javascript-specific extensions' option enabled