The marker-start attribute defines the arrowhead or polymarker that will be drawn at the first vertex of the given shape.

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.

The mathematical attribute indicates the alignment coordinate for glyphs to achieve mathematical baseline alignment for horizontally oriented glyph layouts. The value is an offset in the font coordinate system.

Collection types.

A mutual exclusion primitive useful for protecting shared data

Traits, helpers, and type definitions for core I/O functionality.

Method definition is a shorter syntax for defining a function property in an object initializer. It can also be used in classes.

The keyTimes attribute represents a list of time values used to control the pacing of the animation.

The bitwise OR (|) operator returns a number or BigInt whose binary representation has a 1 in each bit position for which the corresponding bits of either or both operands are 1.