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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 by using a system of tags and attributes.

Key Features:

  • Semantic markup for better structure
  • Support for multimedia elements
  • Form creation capabilities
  • Accessibility features

CSS (Cascading Style Sheets) is used to style and layout web pages. You can use CSS to control colors, fonts, spacing, and positioning of HTML elements.

Basic Concepts:

  • Selectors target HTML elements
  • Properties define the styling
  • Values specify how much
  • Cascading rules determine priority

JavaScript is a programming language that enables interactive web pages. It's an essential part of web applications that runs in your browser and can interact with the DOM.

Common Uses:

  • DOM manipulation
  • Event handling
  • Asynchronous operations (AJAX)
  • Building interactive user interfaces

Following best practices ensures your web projects are maintainable, performant, and accessible to all users. These principles guide modern web development.

Important Practices:

  • Write semantic HTML
  • Keep CSS organized and DRY
  • Optimize JavaScript performance
  • Test across different browsers
  • Prioritize accessibility (a11y)