ES5 compatibility table

http://kangax.github.io/es5-compat-table/

We should start to use strict mode, Object, Array, and getter/setter etc new features with browser native support.

Strict mode

Object.create
Object.defineProperty
Object.defineProperties
Object.getPrototypeOf
Object.keys
Object.seal
Object.freeze
Object.preventExtensions
Object.isSealed
Object.isFrozen
Object.isExtensible
Object.getOwnPropertyDescriptor
Object.getOwnPropertyNames

Array.isArray
Array.prototype.indexOf
Array.prototype.lastIndexOf
Array.prototype.every
Array.prototype.some
Array.prototype.forEach
Array.prototype.map
Array.prototype.filter
Array.prototype.reduce
Array.prototype.reduceRight        

Getter in property initializer
Setter in property initializer

Date.prototype.toISOString
Date.now
JSON
Function.prototype.bind
String.prototype.trim