The includes() method of String values performs a case-sensitive search to determine whether a given string may be found within this string, returning true or false as appropriate.

The toSpliced() method of Array instances is the copying version of the splice() method. It returns a new array with some elements removed and/or replaced at a given index.

The JSON.parse() static method parses a JSON string, constructing the JavaScript value or object described by the string. An optional reviver function can be provided to perform a transformation on the resulting object before it is returned.

The Array[@@species] static accessor property returns the constructor used to construct return values from array methods.

The drop() method of Iterator instances returns a new iterator helper that skips the given number of elements at the start of this iterator.

The every() method of Iterator instances is similar to Array.prototype.every(): it tests whether all elements produced by the iterator pass the test implemented by the provided function. It returns a boolean value.

SVG is an XML language, similar to XHTML, which can be used to draw vector graphics, such as the one shown below. It can be used to create an image either by specifying all the lines and shapes necessary, by modifying already existing raster images, or by a combination of both. The image and its components can also be transformed, composited together, or filtered to change their appearance completely.

The Promise object represents the eventual completion (or failure) of an asynchronous operation and its resulting value.

A WeakRef object lets you hold a weak reference to another object, without preventing that object from getting garbage-collected.

The Intl namespace object contains several constructors as well as functionality common to the internationalization constructors and other language sensitive functions. Collectively, they comprise the ECMAScript Internationalization API, which provides language sensitive string comparison, number formatting, date and time formatting, and more.