The fill() method of Array instances changes all elements within a range of indices in an array to a static value. It returns the modified array.

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 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.

The dx attribute indicates a shift along the x-axis on the position of an element or its content.

The set syntax binds an object property to a function to be called when there is an attempt to set that property. It can also be used in classes.