The radius attribute represents the radius (or radii) for the operation on a given <feMorphology> filter primitive.

The points attribute defines a list of points. Each point is defined by a pair of number representing a X and a Y coordinate in the user coordinate system. If the attribute contains an odd number of coordinates, the last one will be ignored.

The remainder assignment (%=) operator performs remainder on the two operands and assigns the result to the left operand.

A disjunction specifies multiple alternatives. Any alternative matching the input causes the entire disjunction to be matched.

The refX attribute defines the x coordinate of an element's reference point.

The this keyword refers to the context where a piece of code, such as a function's body, is supposed to run. Most typically, it is used in object methods, where this refers to the object that the method is attached to, thus allowing the same method to be reused on different objects.

The orientation attribute indicates that the given glyph is only to be used for a particular text direction, i.e. horizontal or vertical.

The patternTransform attribute defines a list of transform definitions that are applied to a pattern tile.

Private properties are counterparts of the regular class properties which are public, including class fields, class methods, etc. Private properties get created by using a hash # prefix and cannot be legally referenced outside of the class. The privacy encapsulation of these class properties is enforced by JavaScript itself. The only way to access a private property is via dot notation, and you can only do so within the class that defines the private property.

Default function parameters allow named parameters to be initialized with default values if no value or undefined is passed.