Expand/Collapse Widget Examples

What is JavaScript?

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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
  • Support for imperative and declarative programming styles
  • Wide browser support and extensive ecosystem

JavaScript enables interactive web pages and is an essential part of web applications.

Benefits of Responsive Design

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Responsive web design ensures that your website looks great and functions well on all devices, from desktop computers to smartphones.

  • Improved User Experience: Content adapts seamlessly to different screen sizes
  • Better SEO: Google prioritizes mobile-friendly websites
  • Cost-Effective: Maintain one site instead of multiple versions
  • Future-Proof: Adapts to new devices automatically

Implementing responsive design is essential for modern web development.

CSS Flexbox Basics

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Flexbox is a CSS layout module that makes it easier to design flexible responsive layout structures without using float or positioning.

.container {
  display: flex;
  justify-content: center;
  align-items: center;
}

Common properties:

  • flex-direction: Defines the direction of flex items
  • justify-content: Aligns items along the main axis
  • align-items: Aligns items along the cross axis
  • flex-wrap: Controls wrapping of flex items

Common Web Security Issues

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Web security is crucial for protecting your applications and users from various threats. Here are some common vulnerabilities:

  • Cross-Site Scripting (XSS): Injection of malicious scripts into web pages
  • SQL Injection: Insertion of malicious SQL code into queries
  • Cross-Site Request Forgery (CSRF): Unauthorized commands from trusted users
  • Broken Authentication: Weak password policies and session management
  • Sensitive Data Exposure: Inadequate protection of sensitive information

Always validate input, use HTTPS, implement proper authentication, and keep your dependencies updated to maintain security.

HTML Semantic Elements

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Semantic HTML elements clearly describe their meaning to both the browser and the developer, improving accessibility and SEO.

  • <header>: Introductory content or navigation
  • <nav>: Navigation links
  • <main>: Main content of the document
  • <article>: Self-contained composition
  • <section>: Thematic grouping of content
  • <aside>: Content aside from main content
  • <footer>: Footer information

Using semantic elements makes your HTML more meaningful and easier to understand.