Website Accessibility (a11y) — Why It Matters and How to Start

Web accessibility (abbreviated a11y — there are 11 letters between the first and last letter of "accessibility") means building websites so they can be used by as many people as possible, including people with visual, hearing, motor, or cognitive impairments. It is not an optional add-on but a core principle of quality development.

What accessibility is

Accessibility means a person using a screen reader can understand your content; a person without a mouse can navigate with the keyboard; a person with color blindness can distinguish elements. In practice it applies not only to people with permanent disabilities, but also to situational limitations — like bright sunlight on a screen or a broken mouse.

Why it matters

First, the audience. Roughly one in six people worldwide lives with some form of disability. An inaccessible website directly excludes potential customers. Second, legal aspects: the European Accessibility Act and WCAG standards are becoming a mandatory requirement for a growing range of businesses, and non-compliance can bring fines and legal risk.

Third, SEO. Many accessibility practices — semantic HTML, image alt text, clear heading structure — simultaneously improve search engine results, because Google "sees" a page much like a screen reader does. An accessible website is usually also faster, clearer, and more convenient for all users.

Common issues

Low color contrast between text and background makes reading difficult. Missing image alt text leaves screen reader users without context. Functionality available only with a mouse excludes keyboard users. Incorrect or missing ARIA markup and non-semantic HTML (for example, a

instead of a button) make the interface confusing for assistive technologies. Forms without associated label elements and videos without captions are also common mistakes.

How to start and WCAG

The main reference point is WCAG (Web Content Accessibility Guidelines) — the international standard with four principles: content must be perceivable, operable, understandable, and robust. Most organizations aim for the AA conformance level.

Start with the basics: check color contrast (target 4.5:1 for normal text), add meaningful alt text, make sure everything works with the keyboard, and use semantic HTML. Then run an audit with tools like Lighthouse, axe DevTools, or WAVE and, ideally, test with a real screen reader. Accessibility is a continuous process that works best when included from the very start of a project.

Frequently Asked Questions

Does accessibility only apply to people with disabilities?

No. While accessibility primarily helps people with permanent impairments, everyone benefits. Clear structure, good contrast, and keyboard navigation are also useful in situational conditions — bright sunlight, a slow connection, or a broken mouse. An accessible website is usually more convenient for all users.

What is WCAG and which conformance level is needed?

WCAG is an international web content accessibility guidelines standard with three levels: A, AA, and AAA. Most businesses and legal requirements aim for the AA level, which offers a good balance between accessibility and practicality. AAA is the strictest and usually applies to specific types of content.

What tools can be used to check website accessibility?

You can start with automated tools like Google Lighthouse, axe DevTools, and WAVE, which quickly catch the most common issues — low contrast, missing alt text, and ARIA problems. However, automated tests only catch part of the issues, so manual testing with the keyboard and a real screen reader, such as NVDA or VoiceOver, is also recommended.

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