HTML (HyperText Markup Language) is the standard markup language for creating web pages. It provides the structure and content of websites.
HTML works alongside CSS for styling and JavaScript for interactivity to create complete web experiences.
CSS (Cascading Style Sheets) is used to style and layout web pages — for example, to alter the font, color, size, and spacing of your content, split it into multiple columns, or add animations and other decorative features.
JavaScript is a lightweight, interpreted programming language with object-oriented capabilities that allows you to build interactivity into otherwise static HTML pages.
It can respond to user events, validate form data, create dynamic page content, control multimedia, and much more.
This expand/collapse widget uses JavaScript to toggle the visibility of content. When you click the button, it adds or removes the "expanded" class.
CSS transitions create a smooth animation effect as the content expands and collapses.
The arrow icon rotates to indicate the expanded/collapsed state.