The select() method of Intl.PluralRules instances returns a string indicating which plural rule to use for locale-aware formatting of a number.

The resolvedOptions() method of Intl.RelativeTimeFormat instances returns a new object with properties reflecting the locale and relative time formatting options computed during initialization of this Intl.RelativeTimeFormat object.

The nullish coalescing (??) operator is a logical operator that returns its right-hand side operand when its left-hand side operand is null or undefined, and otherwise returns its left-hand side operand.

The static import declaration is used to import read-only live bindings which are exported by another module. The imported bindings are called live bindings because they are updated by the module that exported the binding, but cannot be re-assigned by the importing module.

The origin attribute specifies the origin of motion for an animation. It has no effect in SVG.

The overflow attribute sets what to do when an element's content is too big to fit in its block formatting context. This feature is not widely implemented yet.

The greater than or equal (>=) operator returns true if the left operand is greater than or equal to the right operand, and false otherwise.

A wildcard matches all characters except line terminators. It also matches line terminators if the s flag is set.

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 in attribute identifies input for the given filter primitive.