The getWeekInfo() method of Intl.Locale instances returns a weekInfo object with the properties firstDay, weekend and minimalDays for this locale.

The getTextInfo() method of Intl.Locale instances returns the ordering of characters indicated by either ltr (left-to-right) or by rtl (right-to-left) for this locale.

The hourCycle accessor property of Intl.Locale instances returns the hour cycle type for this locale.

The await using declaration declares block-scoped local variables that are asynchronously disposed. Like const, variables declared with await using must be initialized and cannot be reassigned. The variable's value must be either null, undefined, or an object with a [Symbol.asyncDispose]() or [Symbol.dispose]() method. When the variable goes out of scope, the [Symbol.asyncDispose]() or [Symbol.dispose]() method of the object is called and awaited, to ensure that resources are freed.

A character escape represents a character that may not be able to be conveniently represented in its literal form.

The null keyword refers to the null primitive value, which represents the intentional absence of any object value.

The get syntax binds an object property to a function that will be called when that property is looked up. It can also be used in classes.

The unsigned right shift (>>>) operator returns a number whose binary representation is the first operand shifted by the specified number of bits to the right. Excess bits shifted off to the right are discarded, and zero bits are shifted in from the left. This operation is also called "zero-filling right shift", because the sign bit becomes 0, so the resulting number is always positive. Unsigned right shift does not accept BigInt values.

The JavaScript exception "illegal character" occurs when the lexer reads a character that's not part of a string literal, and the character cannot constitute a valid token in the language.

The maskUnits attribute indicates which coordinate system to use for the geometry properties of the <mask> element.