The d attribute defines a path to be drawn.

A named backreference refers to the submatch of a previous named capturing group and matches the same text as that group. For unnamed capturing groups, you need to use the normal backreference syntax.

The horiz-adv-x attribute indicates the horizontal advance after rendering a glyph in horizontal orientation.

The logical OR (||) (logical disjunction) operator for a set of operands is true if and only if one or more of its operands is true. It is typically used with boolean (logical) values. When it is, it returns a Boolean value. However, the || operator actually returns the value of one of the specified operands, so if this operator is used with non-Boolean values, it will return a non-Boolean value.

The break statement terminates the current loop or switch statement and transfers program control to the statement following the terminated statement. It can also be used to jump past a labeled statement when used within that labeled statement.

The async function* declaration creates a binding of a new async generator function to a given name.

The lighting-color attribute defines the color of the light source for lighting filter primitives.

The media attribute specifies a media query that must be matched for a style sheet to apply.

The limitingConeAngle attribute represents the angle in degrees between the spot light axis (i.e. the axis between the light source and the point to which it is pointing at) and the spot light cone. So it defines a limiting cone which restricts the region where the light is projected. No light is projected outside the cone.

The Math namespace object contains static properties and methods for mathematical constants and functions.