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

Key features:

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

CSS (Cascading Style Sheets) is used to style and layout web pages. Learn the fundamentals of modern CSS.

Core concepts:

• Selectors and specificity
• Box model
• Flexbox and Grid
• Responsive design
• Animations and transitions

JavaScript is a versatile programming language that powers interactive web experiences. It runs in browsers and servers.

Essential topics:

• Variables and data types
• Functions and closures
• DOM manipulation
• Event handling
• Asynchronous programming

Follow these guidelines to create maintainable, accessible, and performant web applications.

• Write semantic HTML
• Use CSS for styling, not layout
• Keep JavaScript unobtrusive
• Test across browsers
• Optimize for performance
• Ensure accessibility compliance

Modern frameworks help developers build complex applications efficiently with reusable components and state management.

Popular frameworks:

• React - Component-based UI library
• Vue - Progressive framework
• Angular - Full-featured framework
• Svelte - Compiler-based approach