The function keyword can be used to define a function inside an expression.

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

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

The <filter> SVG element defines a custom filter effect by grouping atomic filter primitives. It is never rendered itself, but must be used by the filter attribute on SVG elements, or the filter CSS property for SVG/HTML elements.

The <path> SVG element is the generic element to define a shape. All the basic shapes can be created with a path element.

An Iterator object is an object that conforms to the iterator protocol by providing a next() method that returns an iterator result object. All built-in iterators inherit from the Iterator class. The Iterator class provides a [Symbol.iterator]() method that returns the iterator object itself, making the iterator also iterable. It also provides some helper methods for working with iterators.

The <feFuncR> SVG filter primitive defines the transfer function for the red component of the input graphic of its parent <feComponentTransfer> element.

The JavaScript exception "repeat count must be less than infinity" occurs when the String.prototype.repeat() method is used with a count argument that is infinity.

The globalThis global property contains the global this value, which is usually akin to the global object.

The with statement extends the scope chain for a statement.