What is web accessibility, and where should you start?

What web accessibility is

An accessible site works for people who use it differently: with a screen reader, magnification, voice control, a keyboard instead of a mouse, captions, or simply more time. The World Health Organization estimates that about 1.3 billion people, around one in six, live with a significant disability. Accessibility also helps everyone else: captions in a noisy room, contrast in sunlight, keyboard shortcuts for power users.

The barriers that block the most people

WebAIM's yearly analysis of the top million homepages finds the same issues year after year, led by:

• Low contrast text.
• Images without alternative text.
• Form fields without labels.
• Empty links and buttons, often icons without an accessible name.
• Missing page language. Fixing these few categories removes most automatically detectable errors on typical sites.

Where to start

• Run an automated check across the whole site to find the common errors.
• Unplug your mouse and complete your main journeys with Tab, Enter, Space and arrow keys. Note where focus disappears or gets stuck.
• Zoom to 200 percent and check nothing is cut off or overlapping.
• Turn on a screen reader on your homepage and one form.
• Fix the shared components first: navigation, buttons, forms and modals. One fix there repairs every page.

Building it in

• Use native HTML elements, button, a, label, input, before reaching for custom widgets and ARIA.
• Choose design tokens with sufficient contrast from the start.
• Add a skip link and a visible focus style.
• Give every input a visible label, not only a placeholder.
• Caption videos and provide transcripts for audio.
• Add accessibility checks to code review and release testing.

AI-generated interfaces often use div elements with click handlers instead of buttons. They look right and are unusable with a keyboard. Check generated components with Tab before shipping.

Why it matters for business

Accessible sites reach more customers, tend to be better structured for search engines, and reduce legal risk under laws such as the European Accessibility Act and the ADA. Fixing accessibility in a design system is far cheaper than retrofitting every page later.

What a scan can and cannot tell you

WebAuditOS runs source-based accessibility checks on eligible crawled HTML and browser checks on sampled pages: alt text, language, heading order, skip links, zoom, tap targets, form labeling hints and links that resemble an accessibility statement, without reading the statement.

It cannot judge whether content makes sense when read aloud, whether every interaction works by keyboard, or whether alternatives are meaningful. Manual testing remains necessary.

Automation finds the common errors quickly. People find the barriers that matter in context.

Short answers

Is accessibility only for blind users? No. It covers visual, hearing, motor and cognitive disabilities, and situational limits too.

Is accessibility required by law? In many countries and sectors, yes, usually with WCAG as the standard.

What is the quickest win? Fix contrast, alt text and form labels across shared components.

Does accessibility help SEO? Indirectly. Clear structure, text alternatives and headings help search engines as well.