✨ Expand/Collapse Widgets

JavaScript is a high-level, interpreted programming language that is one of the core technologies of the World Wide Web, alongside HTML and CSS.

Key features include:

• Dynamic typing and first-class functions
• Prototype-based object orientation
• Event-driven programming capabilities
• Extensive ecosystem with frameworks like React, Vue, and Angular

CSS (Cascading Style Sheets) is used to style and layout web pages. Here are some modern best practices:

• Use Flexbox and Grid for layouts instead of floats
• Implement CSS custom properties (variables) for maintainable themes
• Leverage CSS animations and transitions for smooth interactions
• Follow the mobile-first responsive design approach
• Use semantic class names that describe purpose, not appearance

Web performance is crucial for user experience and SEO. Fast-loading websites keep users engaged and rank better in search results.

Performance optimization techniques:

• Minimize and compress CSS, JavaScript, and image files
• Implement lazy loading for images and content below the fold
• Use browser caching effectively
• Reduce HTTP requests by bundling resources
• Optimize critical rendering path

This is a simpler variation of the expand/collapse widget with minimal styling. It demonstrates that the same functionality can be achieved with different visual presentations.

The core concept remains the same: clicking the header toggles the visibility of the content below.