HTML (HyperText Markup Language) is the standard markup language for documents designed to be displayed in a web browser. It can be assisted by technologies such as Cascading Style Sheets (CSS) and scripting languages such as JavaScript.
Web browsers receive HTML documents from a web server or from local storage and render the documents into multimedia web pages.
CSS (Cascading Style Sheets) is a style sheet language used for describing the presentation of a document written in HTML or XML (including XML dialects such as SVG, MathML or XHTML).
CSS is a cornerstone technology of the World Wide Web, alongside HTML and JavaScript.
JavaScript is a programming language that is one of the core technologies of the World Wide Web, alongside HTML and CSS. As of 2023, 98% of websites use JavaScript on the client side for webpage behavior, often incorporating third-party libraries.
All major web browsers have a dedicated JavaScript engine to execute the code on the user's device.