Web Accessibility

Introduction

This section explores the essential principles and practices of making web content accessible to all users, including those with disabilities.

You'll learn why accessibility matters, how to apply the POUR principles, and how to test and refine your project for accessibility compliance.

It covers semantic HTML, keyboard navigation, form accessibility, color contrast, ARIA, and more, ensuring you can build inclusive, user-friendly websites.

The Why: The Core Principles of Accessibility

At its core, web accessibility is guided by a few key principles.

These principles form the foundation of accessible design, encapsulated in the acronym POUR.

• Perceivable: Information and UI components must be presented in ways users can perceive, including text alternatives and adaptable content.
• Operable: Navigation and interactions must be keyboard-accessible and user-friendly.
• Understandable: Content and interface behavior should be easy to comprehend and predict.
• Robust: Content should work reliably across various technologies, including assistive tools.

The How: Navigating the Accessibility Guidelines

WCAG is the international standard for web accessibility.

For student projects, Level AA of WCAG 2.1 is the recommended goal.

• Guidelines: Broad principles for accessibility.
• Success Criteria: Specific, testable requirements categorized into levels A, AA, and AAA.

Key Areas of Focus: Your Accessibility Checklist

• Semantic HTML: Use elements like nav, article, and correct heading hierarchy.
• Alternative Text: Provide descriptive alt attributes for images.
• Keyboard Navigation: Ensure all interactive elements can be accessed via keyboard with visible focus.
• Form Accessibility: Use properly linked label elements, ARIA where needed, and clear instructions.
• Color Contrast: Maintain at least 4.5:1 contrast ratio for normal text and avoid relying solely on color.
• ARIA: Use ARIA roles and attributes only when native HTML isn't sufficient.
• Language: Set the lang attribute correctly on the html tag and within content.
• Time-Based Media: Include captions, transcripts, and controls for media.
• Readability: Write clearly, use accessible fonts and spacing.

Semantic HTML Example

<header>
  <nav aria-label="Main menu">
    <a href="/">Home</a>
    <a href="/about">About</a>
  </nav>
</header>

<main>
  <article>
    <h1>Accessible Page Title</h1>
    <p>Page content goes here.</p>
  </article>
</main>

Form Accessibility Example

<label for="email">Email address</label>
<input
  id="email"
  name="email"
  type="email"
  autocomplete="email"
  aria-describedby="email-help"
>
<p id="email-help">Use the email address you check most often.</p>

Testing Your Project for Accessibility

• Test with only the keyboard.
• Try using a screen reader.
• Check color contrast with online tools.
• Run browser accessibility audits, such as Lighthouse.
• Use WCAG checklists for structured review.

The Final Push: Making Accessibility a Priority

Accessibility should be baked into your process from the start.

Making it a habit demonstrates professionalism and care in your work, creating digital experiences that are truly inclusive.