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The unescape() function computes a new string in which hexadecimal escape sequences are replaced with the characters that they represent. The escape sequences might be introduced by a function like escape().

The async function keywords can be used to define an async function inside an expression.

The function* keyword can be used to define a generator function inside an expression.

In programming, inheritance refers to passing down characteristics from a parent to a child so that a new piece of code can reuse and build upon the features of an existing one. JavaScript implements inheritance by using objects. Each object has an internal link to another object called its prototype. That prototype object has a prototype of its own, and so on until an object is reached with null as its prototype. By definition, null has no prototype and acts as the final link in this prototype chain. It is possible to mutate any member of the prototype chain or even swap out the prototype at runtime, so concepts like static dispatching do not exist in JavaScript.

The k2 attribute defines one of the values to be used within the arithmetic operation of the <feComposite> filter primitive.

The RangeError object indicates an error when a value is not in the set or range of allowed values.

The attributeName attribute indicates the name of the CSS property or attribute of the target element that is going to be changed during an animation.

The remainder assignment (%=) operator performs remainder on the two operands and assigns the result to the left operand.