-[async/await syntax](https://caniuse.com/async-functions): not supported in IE and NodeJS < 7.6.0 ([MDN](https://developer.mozilla.org/fr/docs/Web/JavaScript/Reference/Instructions/async_function))
-[ES6 classes](https://caniuse.com/es6-class): not supported in IE and NodeJS < 6 ([MDN](https://developer.mozilla.org/fr/docs/Web/JavaScript/Reference/Classes))
-[class static method](https://caniuse.com/mdn-javascript_classes_static)(not supported in IE and NodeJS < 6) ([MDN](https://developer.mozilla.org/fr/docs/Web/JavaScript/Reference/Classes/static))
-[class static method](https://caniuse.com/mdn-javascript_classes_static) not supported in IE and NodeJS < 6 ([MDN](https://developer.mozilla.org/fr/docs/Web/JavaScript/Reference/Classes/static))
-[Number.isFinite](https://caniuse.com/mdn-javascript_builtins_number_isfinite) not supported in IE and NodeJS < … 0.10 (wow that's oold) ([MDN](https://developer.mozilla.org/fr/docs/Web/JavaScript/Reference/Objets_globaux/Number/isFinite))
-[Number.isInteger](https://caniuse.com/mdn-javascript_builtins_number_isinteger) not supported in IE and NodeJS < … 0.12 (wow that's very old too) ([MDN](https://developer.mozilla.org/fr/docs/Web/JavaScript/Reference/Objets_globaux/Number/isInteger))