Introduction to Accessibility
In this tutorial, you will learn about Introduction to Accessibility. We cover key concepts, practical examples, and best practices to help you master this topic.
Web accessibility (a11y) ensures people with disabilities can perceive, understand, navigate, and interact with websites and applications using assistive technologies like screen readers, voice recognition, and switch devices.
What You'll Learn
You will learn what web accessibility is, why it matters for users and businesses, and how this module is structured to guide you from fundamentals to a practical project.
Why It Matters
Over 1.3 billion people worldwide have a disability. If your website is not accessible, you exclude a massive audience, face legal risk under laws like the ADA and Section 508, and miss the business opportunity of the accessible market.
Real-World Use
Doda Browser includes built-in accessibility features like reader mode and focus indicators. Durga Antivirus Pro maintains WCAG AA Compliance for its enterprise dashboard because security tools must be usable by everyone.
flowchart LR A[Intro] --> B[What Is a11y] B --> C[Why a11y Matters] C --> D[Disability Types] D --> E[Assistive Tech] E --> F[Business Case] F --> G[Standards] G --> H[Project] A:::current classDef current fill:#f90,color:#fff,stroke:#333,stroke-width:2px
What Is Web Accessibility?
Think of a physical store. If the entrance has stairs and no ramp, wheelchair users cannot enter. Web accessibility is the same idea applied to digital products. If your website requires a mouse, people who cannot use a mouse are locked out. If your video has no captions, deaf users miss the content.
The term a11y is a numeronym — "a" + 11 letters + "y" for accessibility. Developer communities use it as shorthand.
How the Module Is Structured
This module has 15 lessons covering: what a11y is, why it matters, disability types, assistive technologies, the business case, stakeholders, inclusive design, universal design, standards, the difference between a11y and usability, common myths, roles for developers and designers, ethics, and a final project.
Each lesson follows the same pattern: what you will learn, why it matters, a real-world example, a mermaid diagram, code or practical examples, common mistakes, practice questions, FAQ, and a what-is-next section with internal links.
Prerequisites
Basic HTML and CSS knowledge. Familiarity with JavaScript helps but is not required. No accessibility experience needed — this is your starting point.
How Accessibility Fits into Development
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Accessible Page — DodaTech</title>
</head>
<body>
<a href="#main" class="skip-link">Skip to main content</a>
<header role="banner">
<nav aria-label="Main navigation">
<ul>
<li><a href="/">Home</a></li>
<li><a href="/about">About</a></li>
</ul>
</nav>
</header>
<main id="main">
<h1>Welcome to Accessibility</h1>
<p>This page works with screen readers and keyboard navigation.</p>
</main>
</body>
</html>
Expected behavior: Screen readers announce the page title, the navigation landmark, and the main content area. Keyboard users can Tab through links with visible focus indicators.
Common Mistakes
1. Thinking Accessibility Is Only for Blind Users
Accessibility covers visual, auditory, motor, and cognitive disabilities. Blind users are one group among many.
2. Treating Accessibility as a Final Step
Fixing accessibility after launch costs 10 to 100 times more than building it in from the start.
3. Relying Only on Automated Tools
Automated tools catch about 30 percent of issues. Manual testing with keyboard navigation and screen readers is essential.
4. Using Divs for Interactive Elements
A div with an onclick handler is not keyboard accessible. Use native button and a elements.
5. Ignoring Mobile Accessibility
WCAG applies to all devices. Mobile-specific issues like touch targets and viewport zoom are frequently missed.
6. Assuming Accessibility Is Just Alt Text
Alt text is one small part. Accessibility includes contrast, keyboard support, focus management, ARIA, captions, and more.
7. Skipping User Testing
The most reliable way to know if your site is accessible is to test with real users who rely on assistive technologies.
Practice Questions
1. What does the term a11y mean?
It is a numeronym for accessibility — the letter a, 11 letters, and the letter y.
2. How many people worldwide have a disability?
Over 1.3 billion people, approximately 16 percent of the global population.
3. Why does retrofitting accessibility cost more than building it from the start?
Accessibility is like building a ramp at the same time as the stairs. Adding a ramp later requires tearing out existing work.
4. What is the first step toward learning accessibility?
Start with this module. Learn the fundamentals, then move to WCAG compliance, ARIA, and specific topics like keyboard navigation and color contrast.
5. Challenge: List three websites you use daily. For each, identify one accessibility feature and one potential accessibility issue.
FAQ
Mini Project
Find a website you use frequently. Using only your keyboard (no mouse), try to complete a task like filling out a form or navigating a menu. Note every point where you get stuck or cannot proceed.
What's Next
Continue to the next lesson where you learn the definition of web accessibility in depth. Then explore Why a11y Matters and Disability Types.
Built by the developers of DodaTech
Doda Browser, DodaZIP & Durga Antivirus Pro