A fixed-size array, denoted `[T; N]`, for the element type, `T`, and the non-negative compile-time constant size, `N`.

The yield operator is used to pause and resume a generator function.

An empty statement is used to provide no statement, although the JavaScript syntax would expect one.

The attributeName attribute indicates the name of the CSS property or attribute of the target element that is going to be changed during an animation.

The var statement declares function-scoped or globally-scoped variables, optionally initializing each to a value.

The [Symbol.iterator]() method of arguments objects implements the iterable protocol and allows arguments objects to be consumed by most syntaxes expecting iterables, such as the spread syntax and for...of loops. It returns an array iterator object that yields the value of each index in the arguments object.

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

The JavaScript exception "Initializing an object twice is an error with private fields/methods" occurs when an object that was created via a class constructor goes through the class construction again, and the class contains a private element. This is usually caused by the return override trick.

The letter-spacing attribute controls spacing between text characters.

The JavaScript warning "-file- is being assigned a //# sourceMappingURL, but already has one." occurs when a source map has been specified more than once for a given JavaScript source.