The Intl namespace object contains several constructors as well as functionality common to the internationalization constructors and other language sensitive functions. Collectively, they comprise the ECMAScript Internationalization API, which provides language sensitive string comparison, number formatting, date and time formatting, and more.

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

BigInt values represent integer values which are too high or too low to be represented by the number primitive.

The stroke-miterlimit attribute is a presentation attribute defining a limit on the ratio of the miter length to the stroke-width used to draw a miter join. When the limit is exceeded, the join is converted from a miter to a bevel.

The logical NOT (!) (logical complement, negation) operator takes truth to falsity and vice versa. It is typically used with boolean (logical) values. When used with non-Boolean values, it returns false if its single operand can be converted to true; otherwise, returns true.

The logical OR assignment (||=) operator only evaluates the right operand and assigns to the left if the left operand is falsy.

The undefined global property represents the primitive value undefined. It is one of JavaScript's primitive types.

The pointer-events attribute is a presentation attribute that allows defining whether or when an element may be the target of a mouse event.

The stdDeviation attribute defines the standard deviation for the blur operation.

The exponentiation (**) operator returns the result of raising the first operand to the power of the second operand. It is equivalent to Math.pow(), except it also accepts BigInts as operands.