Expand/Collapse Widget Demo

What is HTML?

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

Key features:

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

CSS Styling Tips

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CSS (Cascading Style Sheets) is used to style and layout web pages — for example, to alter the font, color, size, and spacing of your content.

Best practices:

  • Use semantic class names
  • Organize CSS logically
  • Minimize inline styles
  • Use CSS variables for consistency

JavaScript Interactivity

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JavaScript is a programming language that enables interactive web pages and is an essential part of web applications.

Common uses:

  • DOM manipulation
  • Event handling
  • Form validation
  • Asynchronous operations
// Toggle function example
function toggleExample(header) {
  const example = header.parentElement;
  example.classList.toggle('expanded');
}

Advanced Features

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This expand/collapse widget includes smooth animations, hover effects, and responsive design principles.

Implementation details:

  • CSS transitions for smooth animations
  • Flexbox layout for alignment
  • CSS gradients for visual appeal
  • JavaScript toggle functionality