HTML stands for HyperText Markup Language. It is the standard markup language used to create and structure content on the web. HTML elements are the building blocks of web pages, defining headings, paragraphs, links, images, and more.
CSS stands for Cascading Style Sheets. It is a stylesheet language used to describe the presentation of a document written in HTML. CSS controls the layout, colors, fonts, spacing, and overall visual appearance of web pages.
JavaScript is a versatile, high-level programming language that enables interactive and dynamic behavior on web pages. It can manipulate the DOM, handle events, make asynchronous requests to servers, and much more. It is one of the core technologies of the World Wide Web alongside HTML and CSS.
Expand/collapse widgets (also known as accordions or collapsible sections) help organize content in a compact way. They allow users to focus on the information they need without being overwhelmed by large amounts of text. This pattern is especially useful for FAQs, settings panels, and navigation menus.