Expand/Collapse Widgets

HTML Overview

HTML (HyperText Markup Language) is the standard markup language used to create web pages. It provides the structure and content of websites.

Key features include:

• Semantic markup for accessibility
• Support for multimedia elements
• Form controls for user interaction
• Metadata for SEO and browser optimization

CSS Capabilities

CSS (Cascading Style Sheets) is used to style and layout web pages. It enables responsive design and modern visual effects.

Popular features:

• Flexbox and Grid layouts
• Animations and transitions
• Media queries for responsiveness
• Custom properties (CSS variables)
• Gradients and transforms

JavaScript Features

JavaScript adds interactivity and dynamic behavior to web pages. This expand/collapse widget is powered by JavaScript event handlers.

Common uses:

• DOM manipulation
• Event handling and listeners
• Asynchronous operations with Promises and async/await
• API integration and data fetching
• Real-time user interactions

Implementation Details

This expand/collapse widget demonstrates:

• Toggle Button: Clicking triggers the expand/collapse action
• Details Container: The content area with the details class that expands and collapses
• Smooth Animation: CSS transitions provide smooth height and padding changes
• Icon Rotation: The arrow icon rotates to indicate state
• Active States: Visual feedback through color and styling changes