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Welcome to HTML & Web Development

The HTML article collection contains tips, tricks and practical code examples to help you master web development. This collection covers elements, tags, links, forms, tables and more.

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What You’ll Learn

This documentation covers essential HTML concepts and best practices:
  • Document Structure: Learn how to properly structure HTML documents with semantic elements
  • Head Elements: Master the <head> section with metadata, icons, and SEO tags
  • Accessibility: Make your websites accessible to all users with proper markup
  • Performance: Optimize your HTML for better page load times
  • Security: Protect your users with secure linking practices
  • Modern HTML: Explore new HTML5 features and APIs

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Core Concepts

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Semantic HTML

HTML5 introduced a variety of new semantic HTML elements to help replace the much dreaded <div>, such as <section>, <main>, <article>, <nav> and more. When developing a website, you should understand what each part of your layout represents and try to use the appropriate element for it. 
<main>
  <article>
    <header>
      <h1>Article Title</h1>
    </header>
    <section>
      <p>Article content goes here...</p>
    </section>
  </article>
  <nav>
    <a href="/home">Home</a>
    <a href="/about">About</a>
  </nav>
</main>

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Accessibility First

Accessibility (a11y) can improve your website and attract new users. Some key principles:
  • Use semantic HTML for proper document structure
  • Caption images with descriptive alt attributes
  • Label inputs appropriately using <label> elements
  • Design responsively for all devices and input methods
  • Organize content with clear sections and hierarchy

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Performance Optimization

HTML plays a crucial role in website performance: 
<!-- Lazy load images -->
<img src="/img/photo.jpg" alt="Description" loading="lazy" />

<!-- Preload critical resources -->
<link rel="preload" href="/fonts/main.woff2" as="font" type="font/woff2" crossorigin>

<!-- Async/defer scripts -->
<script src="/js/main.js" defer></script>

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Interactive Elements

HTML provides many built-in interactive elements that don’t require JavaScript:

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Details Accordion

The <details> element creates collapsible content without JavaScript: 
<details>
  <summary>Click to expand</summary>
  <p>This content will be shown when expanded.</p>
</details>
You can even create accordion-style components by grouping <details> elements with the same name attribute: 
<details name="accordion">
  <summary>Section 1</summary>
  <p>Content of section 1.</p>
</details>

<details name="accordion">
  <summary>Section 2</summary>
  <p>Content of section 2.</p>
</details>

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Security Considerations

When using target="_blank" to open links in new tabs, always include security attributes to protect your users: 
<!-- Bad: susceptible to tabnabbing -->
<a href="https://external.com" target="_blank">
  External link
</a>

<!-- Good: secure external link -->
<a href="https://external.com" target="_blank" rel="noopener noreferrer">
  External link
</a>
The rel="noopener noreferrer" attribute prevents the new tab from gaining access to your page via Window.opener, protecting against tabnabbing attacks.

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Next Steps

Explore the documentation to learn more about:
  • Head Basics: Essential metadata and SEO tags for your <head> element
  • Best Practices: Industry-standard approaches to HTML development
  • Code Examples: Real-world snippets from production websites
Start building accessible, performant, and secure web pages with HTML!

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