What is website accessibility

Over 96 percent of the most visited websites have detectable accessibility failures on their home page. That number comes from WebAIM's annual accessibility study, which tests millions of pages each year. Accessible website design is not the default. It has to be built deliberately, and on the majority of business websites, it has not been.

Accessible website design means structuring and building a website so that people with disabilities can perceive, navigate, and interact with it effectively. This includes people with visual impairments who use screen readers, people with motor disabilities who navigate by keyboard rather than mouse, people with hearing loss who need captions on audio and video content, and people with cognitive disabilities who benefit from clear, consistent layouts.

Accessibility is not a feature added at the end of a build. It is a set of design and development decisions made throughout that determine whether all visitors, not just those without disabilities, can use the site.

Which visitors does accessible website design serve?

The World Health Organization estimates that over 1.3 billion people live with some form of disability. That is roughly 16 percent of the global population. Designing for accessibility means designing for a significant share of your potential audience.

The benefits extend beyond users with permanent disabilities. A visitor using a phone in bright sunlight has reduced visibility. Someone with a temporary injury may navigate by keyboard. A user watching a video in a noisy environment needs captions to follow along. Accessibility improvements serve temporary and situational limitations just as much as permanent ones. A website built to be accessible works better for a far wider range of people.

There is also a legal dimension. In many countries, including the United States, businesses are required by law to provide equal access to their services. Websites have been the subject of accessibility lawsuits, and the number of web accessibility legal actions has grown steadily each year. The article on how to make your website ADA compliant covers what the legal requirements mean in practice for business websites.

What are the WCAG accessibility standards?

The Web Content Accessibility Guidelines, known as WCAG, are the internationally recognized standards for web accessibility. Published by the World Wide Web Consortium, WCAG defines three conformance levels. Level A is the minimum baseline. Level AA is the standard referenced in most legal frameworks and the practical target for business websites. Level AAA is the most comprehensive and is rarely required across an entire site.

WCAG is organized around four core principles, referred to by the acronym POUR.

Perceivable

All content must be presented in ways users can perceive. Text alternatives for images allow screen readers to describe visual content to users who cannot see it. Captions and transcripts make audio and video accessible to people with hearing loss. Sufficient color contrast ensures text is readable for people with low vision or color blindness.

Operable

All functionality must be operable through a keyboard, not just a mouse or touchscreen. Navigation must be predictable. Users must have enough time to read and interact with content without time pressure. Flashing content that could trigger seizures must be avoided or controlled.

Understandable

Content and navigation must be readable and understandable. The page language must be declared so screen readers apply the correct pronunciation rules. Error messages in forms must explain what went wrong and how to fix it. Navigation must behave consistently across pages so users can predict where controls will be.

Robust

Content must work reliably with current and future assistive technologies. This means using valid, semantic HTML so that screen readers and other tools can interpret the page structure correctly. Buttons must be coded as buttons. Headings must follow a logical hierarchy rather than being chosen for visual size alone. The article on what visual hierarchy is explains how heading structure and visual weight work together across a page.

What are the most common website accessibility problems?

WebAIM's accessibility analysis identifies six failure types that appear on the overwhelming majority of tested pages. Missing alternative text on images is the most frequent. Low color contrast between text and its background is the second. Missing form labels, empty links, missing document language declarations, and empty buttons account for the rest.

For business websites, the practical starting points are text alternatives for all meaningful images, sufficient contrast on all text elements, clear labels on every form field, and a logical heading structure throughout each page.

Navigation accessibility is another common gap. Dropdown menus that only activate on hover fail for keyboard users. Links that say "click here" or "read more" without surrounding context fail for screen reader users who navigate by link list. The article on what website navigation is covers how to build navigation that works across all input methods and devices.

How do you test your website for accessibility?

Automated tools can identify a large share of accessibility failures quickly. Browser extensions that analyze pages against WCAG criteria surface contrast issues, missing alt text, and structural problems without any technical setup. Running an automated scan is a reasonable first step and will catch the most common issues across most pages.

Automated testing has limits. It cannot reliably assess whether alt text is descriptive, whether the reading order makes sense when CSS is removed, or whether interactive elements work correctly with a screen reader. Manual testing is necessary for a thorough audit. Navigating through the key pages of a site using only a keyboard, without touching the mouse, is a quick check that reveals operability problems immediately.

For a comprehensive audit, testing with actual assistive technology is the most reliable approach. Screen readers are available on all major operating systems at no cost, and walking through the important pages of a site with one active exposes issues that automated tools miss entirely.

How does accessibility affect SEO?

Many accessibility practices directly support SEO. Alt text on images provides context for search engines that cannot interpret visual content. A logical heading structure helps search engines understand how a page is organized. Descriptive link text gives search engines meaningful anchor text rather than generic phrases. Pages that are keyboard-navigable and structurally clean tend to perform better on user experience signals overall.

The overlap is not accidental. Both accessibility and SEO are fundamentally about making content available and understandable to a wider range of users and systems. Improvements to one frequently benefit the other. The article on what SEO is explains how search engines evaluate page quality and where accessibility practices intersect with ranking signals.

How WEMASY handles accessibility

WEMASY's website builder generates semantic HTML and applies heading structures in a logical order. Alt text fields are included for all images so descriptions can be added without editing code. Templates are built against WCAG AA color contrast standards so the default design passes without manual adjustment. Keyboard navigation and mobile touch targets are handled by the platform rather than requiring separate configuration.

See what is included at the WEMASY website builder or review plans on the pricing page.

Frequently asked questions