Accessibility Basics

This lesson explains Accessibility Basics in web accessibility with clear examples, practical use cases, and implementation best practices.

Web Accessibility Basics Overview

Web Accessibility Basics introduce the essential techniques every developer should follow to build websites that are usable by everyone. Accessibility starts with writing semantic HTML, providing meaningful content, supporting keyboard navigation, and ensuring compatibility with assistive technologies such as screen readers.

Building accessibility from the beginning reduces development costs, improves usability, supports SEO, and helps websites comply with accessibility standards like WCAG.

Accessibility Basic	Purpose
Semantic HTML	Provides meaningful page structure
Keyboard Navigation	Allows users to navigate without a mouse
Alternative Text	Describes images for screen readers
Form Labels	Improves form accessibility
Color Contrast	Makes content easier to read
Focus Indicators	Shows keyboard users where they are

Basic Accessible HTML Example

<main>
  <h1>Accessibility Basics</h1>

  <button type="button">
    Save Changes
  </button>
</main>

Using semantic HTML elements like main, h1, and button provides built-in accessibility support for browsers and assistive technologies without additional ARIA attributes.

Essential Accessibility Fundamentals

Every accessible website should include a few core building blocks. These fundamentals improve usability for everyone and create a solid foundation before implementing advanced accessibility techniques.

Feature	Why It Matters	Best Practice
Semantic HTML	Helps browsers understand page structure	Use header, nav, main, section, article and footer
Headings	Improves navigation	Follow logical heading hierarchy
Images	Supports screen readers	Add meaningful alt text
Forms	Improves usability	Associate labels with controls
Keyboard Support	Allows navigation without a mouse	Ensure all controls are reachable
Focus	Shows active element	Never remove visible focus styles

Accessibility Best Practices

Practice	Recommendation
Use Semantic HTML	Prefer native HTML elements over generic div elements.
Write Descriptive Text	Use meaningful headings, labels, and link text.
Support Keyboard Users	Ensure every interactive element is keyboard accessible.
Provide Alternative Text	Describe informative images with accurate alt text.
Maintain Contrast	Choose text and background colors with sufficient contrast.
Test Accessibility	Use browser tools, screen readers, and keyboard navigation.

Common Accessibility Mistakes

Using div elements instead of buttons or links.
Skipping heading levels such as jumping from h1 to h4.
Missing labels on form controls.
Using images without alternative text.
Relying only on color to communicate information.
Removing keyboard focus outlines.
Using tiny clickable areas on mobile devices.
Writing vague link text like "Click Here."

Key Takeaways

Accessibility should be considered from the beginning of every project.
Semantic HTML is the foundation of accessible websites.
Every interactive element should support keyboard navigation.
Alternative text helps users understand non-text content.
Clear labels, headings, and navigation improve usability and SEO.
Testing accessibility regularly helps identify issues before deployment.

Pro Tip

Before adding ARIA attributes, check whether a native HTML element already provides the accessibility behavior you need. Native HTML is simpler, performs better, and is supported by all major browsers and assistive technologies.