As of 2023, 98.7% of websites use JavaScript on the client side for webpage behavior, often incorporating third-party libraries. JavaScript ( / ˈ dʒ ɑː v ə s k r ɪ p t/), often abbreviated as JS, is a programming language and core technology of the World Wide Web, alongside HTML and CSS. Java, Scheme, Self, AWK, HyperTalk ĪctionScript, AssemblyScript, CoffeeScript, Dart, Haxe, JS++, Opa, TypeScript