All these ES6 features can be transpilled to ES5. Web APIs and DOM APIs missing in Safari cannot. You can't polyfill WebRTC (without a plugin and there is no p

All these ES6 features can be transpilled to ES5. Web APIs and DOM APIs missing in Safari cannot. You can't polyfill WebRTC (without a plugin and there is no plugin support on IOS obviously). I would prefer no support for ES6 so they concentrate on implementing APIs such as WebRTC,ServiceWorkers ...