Locale-specific date and time formatting, number formatting, and comparisons are provided through the Internationalization API, which conforms to the ECMAScript Internationalization API Specification. For details, see Intl.DateTimeFormat Object, Intl.NumberFormat Object, and Intl.Collator Object.
You can use the __proto__ property to set the prototype for user-defined objects, intrinsic objects, and functions. To learn more, see __proto__ Property (Object).
Asynchronous tracing functions
Typed array enhancements
A new typed array, Uint8ClampedArray, provides support for typed arrays consisting of 8-bit unsigned integers with values clamped to the range 0-255. In addition, the ArrayBuffer object now supports the slice method and ArrayBuffer.isView function.