Expand/Collapse Widget Examples

HTML (HyperText Markup Language) is the standard markup language for creating web pages. It provides the structure and content of websites by using a system of tags and elements that tell web browsers how to display text, images, links, and other media.

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. This stylesheet language allows developers to control the visual presentation of HTML elements.

JavaScript is a versatile programming language that enables interactive web pages. It is an essential part of web applications and can be used to perform calculations, validate form data, create dynamic page content, and control multimedia. JavaScript runs on the user's browser and can respond to user events in real-time.

Expand/collapse widgets (also called accordions) use JavaScript to toggle the visibility of content sections. When a user clicks the toggle button, JavaScript adds or removes a CSS class that changes the max-height property, creating a smooth animation. The aria-expanded attribute updates for accessibility, indicating whether the content is currently expanded or collapsed.