Expand/Collapse Widget Demo

HTML (HyperText Markup Language) is the standard markup language for creating web pages. It provides the structure and content of websites, using a system of tags and elements to organize information.

Key features include:

• Semantic markup
• Form controls
• Media embedding
• Accessibility support

CSS (Cascading Style Sheets) is used to style and layout web pages. It allows you to control colors, fonts, spacing, and positioning of elements.

Main advantages:

• Separation of content and design
• Responsive design capabilities
• Consistent styling across pages
• Performance optimization

JavaScript is a versatile programming language that enables interactive web applications. It runs in browsers and can manipulate the DOM, handle events, and communicate with servers.

Popular use cases:

• Form validation
• Dynamic content updates
• Animation effects
• API interactions

Following best practices ensures that your web applications are maintainable, performant, and accessible to all users.

Essential practices:

• Write semantic HTML
• Use responsive design
• Optimize performance
• Test across browsers
• Follow accessibility guidelines