ECMAScript 5 6 7 non-standard compatibility table by kangax & webbedspace Please note that some of these tests represent existence , not functionality or full conformance. Sort by number of features? Show obsolete browsers? Compilers/polyfills Desktop browsers Servers/runtimes Mobile Feature name Current browser TABLE HEADERS Traceur 6to5 + core-js [1] ES6 Transpiler Closure Compiler JSX [2] TypeScript es6- shim IE 10 IE 11 IE Technical Preview [3] FF 11-12 FF 13 FF 16 FF 17 FF 18 FF 23 FF 24 FF 25 FF 27 FF 28 FF 29 FF 30 FF 31 FF 32 FF 33 FF 34 FF 35 FF 36 FF 37 CH <19 CH 19 [4] CH 21-29 [4] CH 30, OP 17 [4] CH 31, OP 18 [4] CH 32-33, OP 19-20 [4] CH 34, OP 21 [4] CH 35, OP 22 [4] CH 36, OP 23 [4] CH 37, OP 24 [4] CH 38, OP 25 [4] CH 39, OP 26 [4] CH 40, OP 27 [4] CH 41, OP 28 [4] SF 5.1 SF 6 SF ...