The findLastIndex() method of Array instances iterates the array in reverse order and returns the index of the first element that satisfies the provided testing function. If no elements satisfy the testing function, -1 is returned.

The Atomics.exchange() static method exchanges a given value at a given position in the array and returns the old value at that position. This atomic operation guarantees that no other write happens between the read of the old value and the write of the new value.

The Atomics.load() static method returns a value at a given position in the array.

The toUpperCase() method of String values returns this string converted to uppercase.

The async function* declaration creates a binding of a new async generator function to a given name.

The clip-path presentation attribute defines or associates a clipping path with the element it is related to.

The import() syntax, commonly called dynamic import, is a function-like expression that allows loading an ECMAScript module asynchronously and dynamically into a potentially non-module environment.

The horiz-adv-x attribute indicates the horizontal advance after rendering a glyph in horizontal orientation.

The delete operator removes a property from an object. If the property's value is an object and there are no more references to the object, the object held by that property is eventually released automatically.

The font-size-adjust attribute allows authors to specify an aspect value for an element that will preserve the x-height of the first choice font in a substitute font.