A character class escape is an escape sequence that represents a set of characters.

The arguments.callee data property contains the currently executing function that the arguments belong to.

A TypedArray object describes an array-like view of an underlying binary data buffer. There is no global property named TypedArray, nor is there a directly visible TypedArray constructor. Instead, there are a number of different global properties, whose values are typed array constructors for specific element types, listed below. On the following pages you will find common properties and methods that can be used with any typed array containing elements of any type.

The <feDisplacementMap> SVG filter primitive uses the pixel values from the image from in2 to spatially displace the image from in.

The for...of statement executes a loop that operates on a sequence of values sourced from an iterable object. Iterable objects include instances of built-ins such as Array, String, TypedArray, Map, Set, NodeList (and other DOM collections), as well as the arguments object, generators produced by generator functions, and user-defined iterables.

The JavaScript exception "Invalid code point" occurs when NaN values, negative Integers (-1), non-Integers (5.4), or values larger than 0x10FFFF (1114111) are used with String.fromCodePoint().

The using declaration declares block-scoped local variables that are synchronously disposed. Like const, variables declared with using must be initialized and cannot be reassigned. The variable's value must be either null, undefined, or an object with a [Symbol.dispose]() method. When the variable goes out of scope, the [Symbol.dispose]() method of the object is called, to ensure that resources are freed.

The clip attribute defines the visible region of an element. You should use clip-path instead.

The <pattern> SVG element defines a graphics object which can be redrawn at repeated x- and y-coordinate intervals ("tiled") to cover an area.

The <radialGradient> SVG element lets authors define radial gradients that can be applied to fill or stroke of graphical elements.