The fx attribute defines the x-axis coordinate of the focal point for a radial gradient.

The filter attribute specifies the filter effects defined by the <filter> element that shall be applied to its element.

The unsigned right shift assignment (>>>=) operator performs unsigned right shift on the two operands and assigns the result to the left operand.

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

The fill attribute has two different meanings. For shapes and text it's a presentation attribute that defines the color (or any SVG paint servers like gradients or patterns) used to paint the element; for animation it defines the final state of the animation.

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 with statement extends the scope chain for a statement.

The divisor attribute specifies the value by which the resulting number of applying the kernelMatrix of a <feConvolveMatrix> element to the input image color value is divided to yield the destination color value.

The glyph-name attribute specifies the name of a glyph.

Generally speaking, a function is a "subprogram" that can be called by code external (or internal, in the case of recursion) to the function. Like the program itself, a function is composed of a sequence of statements called the function body. Values can be passed to a function as parameters, and the function will return a value.