Building Accessible Web Interfaces: A Practical WCAG 2.2 Compliance Guide

Web Accessibility is a Technical Prerequisite, Not an Afterthought

Building software accessible to individuals with visual, auditory, motor, or cognitive disabilities is an ethical necessity and an increasing legal requirement worldwide. Modern search engines also reward accessible websites with superior search indexing because clean semantics help crawlers parse structured document hierarchy.

1. Semantic HTML over ARIA Attributes

The first rule of ARIA is: Don't use ARIA if a native HTML element already exists. A native <button> element inherently provides keyboard focus, Space/Enter key triggering, and screen-reader role announcements without manual event plumbing.

2. Keyboard Navigation and Focus Trapping in Modals

Every interactive element must be navigable using the Tab key. When an accessible modal dialog opens:

1. Focus must automatically shift into the dialog's primary actionable element.
2. The Tab key must cycle strictly within the modal boundaries (focus trap).
3. Pressing the Escape key must immediately dismiss the modal and restore focus to the triggering element.

3. Color Contrast and Touch Targets

WCAG 2.2 Level AA requires a minimum contrast ratio of 4.5:1 for normal text and 3:1 for large text. On mobile interfaces, touch targets must maintain a minimum physical area of 44x44 CSS pixels to accommodate varying motor capabilities.