Comprehensive guide to web accessibility — standards, implementation patterns, and testing strategies

Accessibility

Web accessibility ensures that websites and applications are usable by everyone, including people with disabilities. This section covers standards, implementation techniques, and testing strategies for building inclusive web experiences.

Why Accessibility Matters

Users Who Benefit from Accessibility
├── Visual: blind, low vision, color blind
├── Auditory: deaf, hard of hearing
├── Motor: limited fine motor control, tremors, paralysis
├── Cognitive: dyslexia, ADHD, autism, memory impairments
├── Temporary: broken arm, ear infection, bright sunlight
└── Situational: noisy environment, slow connection, small screen

Accessibility is not just about permanent disabilities — it benefits everyone through better usability, SEO, and legal compliance.

Topics

shield

Standards & Guidelines

WCAG, WAI-ARIA, Section 508, and legal requirements

code

Semantic HTML

Document structure, landmarks, headings, and native semantics

tag

ARIA

Roles, states, properties, and live regions

navigation

Keyboard & Focus

Keyboard navigation, focus management, and focus trapping

eye

Visual Design

Color contrast, motion, responsive design, and typography

file-text

Forms & Media

Accessible forms, validation, images, video, and audio

check-circle

Testing

Automated tools, manual testing, and screen reader testing

Core Principles (POUR)

Principle	Description	Examples
Perceivable	Information must be presentable in ways users can perceive	Alt text, captions, sufficient contrast
Operable	UI must be operable through various input methods	Keyboard navigation, enough time, no seizure triggers
Understandable	Content and UI must be understandable	Clear language, predictable navigation, error guidance
Robust	Content must work with current and future technologies	Valid HTML, ARIA support, progressive enhancement

Overview