Website accessibility is the work of making a website usable for everyone, including the one in four adults in the United States who lives with a disability. That is more than 60 million people in the US alone. Globally, about 15% of the population, more than a billion people, has some form of disability. A website that is not accessible quietly closes the door on a large portion of potential customers.
Accessibility is also a legal issue with consequences that keep growing. Beyond legal exposure, accessible design produces better websites overall, since the same choices that help users with disabilities help everyone else too.
Why Accessibility Matters
The case for accessibility rests on three pillars: legal requirements, business benefits, and ethical responsibility.
Legal Requirements and Risks
The Americans with Disabilities Act (ADA) prohibits discrimination against people with disabilities, and US courts have increasingly read that to include websites. Section 508 of the Rehabilitation Act explicitly requires federal agencies and their contractors to maintain accessible digital content. Various state laws add their own requirements on top.
The legal landscape has shifted hard. Over 4,000 website accessibility lawsuits were filed in 2023 alone, and the number keeps growing. Businesses of every size have faced legal action, from large retailers down to neighborhood restaurants and small online stores. Settlements and judgments can be substantial, and the ongoing compliance work adds costs after that.
Even if you have avoided action so far, running an inaccessible website is ongoing legal exposure. The law is moving toward more enforcement, not less, and waiting for a complaint to force action is an expensive way to learn the lesson.
Business Benefits
Beyond the legal piece, accessible websites perform better across the board. The 15% of the global population with disabilities represents over $8 trillion in annual purchasing power. Putting up barriers to that market segment through inaccessible design is bad business.
Accessible design also helps search engine optimization. Search engines cannot see images, so they read alt text to understand visual content. They cannot parse a poorly structured page, so semantic HTML helps them follow your content hierarchy. Many accessibility best practices directly improve technical SEO.
Most of all, accessible design produces better user experiences for everyone. Captions help users in noisy rooms or those who cannot play audio. High contrast helps users reading in bright sunlight. Clear navigation helps everyone find what they came for. The improvements you make for accessibility carry through to every other visitor too.
Ethical Responsibility
The web was created to be universally accessible. That is part of its founding mission. Locking people out of information, services, and commerce because of disability contradicts that mission. Building accessible websites is good business, and it is also the right thing to do.
Understanding WCAG: The POUR Principles
The Web Content Accessibility Guidelines (WCAG), published by the World Wide Web Consortium (W3C), are the international standard for web accessibility. They are organized around four principles, often remembered by the acronym POUR: Perceivable, Operable, Understandable, and Robust.
Perceivable
Information and interface components have to be presentable in ways users can perceive. Content cannot rely on a single sense. Visual information needs alternatives for users who cannot see, and audio information needs alternatives for users who cannot hear.
Text alternatives for images let screen readers describe visual content to blind users. Captions for videos serve deaf users and those who cannot play audio. Sufficient color contrast keeps text readable for users with low vision or color blindness. Multiple modes of presentation make sure that no matter how a user takes information in, they can reach it.
Operable
Interface components and navigation have to be operable, meaning users must be able to interact with every piece of functionality. The interface cannot require physical capabilities some users lack.
Keyboard accessibility sits at the center. Users who cannot use a mouse because of motor disabilities, blindness, or other conditions navigate with keyboards or keyboard-like devices. Every interactive element has to be reachable and usable with the keyboard alone. Users need enough time to complete tasks, since content that times out too quickly creates a barrier. Navigation has to stay clear and consistent so users can find their way.
Understandable
Information and operation of the interface have to be understandable. Content should read clearly without specialized knowledge or exceptional reading skill. Interfaces should behave predictably so users know what to expect next.
Clear, simple language helps users with cognitive disabilities, and it helps everyone else too. Consistent navigation and interaction patterns help users build mental models of how the site works. Error prevention and clear error messages help users avoid mistakes and recover from them quickly.
Robust
Content has to be robust enough to be interpreted reliably by a wide range of user agents, including assistive technologies. That requires clean, valid code that follows web standards and does not break when accessed through screen readers, voice control, or other assistive tools. Robust code also contributes to website speed optimization, since well-structured pages load and render more efficiently.
Semantic HTML, using elements for what they mean instead of how they look, gives assistive technologies the structure they need. ARIA (Accessible Rich Internet Applications) attributes add context where native HTML falls short. Regular testing with assistive technologies confirms compatibility.
Quick Wins for Improving Accessibility
Full accessibility takes ongoing work. A handful of improvements deliver outsized impact for relatively little effort.
1. Alt Text for Images
Every meaningful image on the site needs descriptive alternative text (alt text) that conveys the image's content or function. When a screen reader hits an image, it reads the alt text aloud so the user understands what the image is showing.
Good alt text describes content, not presence. "Photo of a person" tells users almost nothing. "Customer service representative smiling while helping a customer on the phone" paints a picture. For images that act as buttons or links, describe the function instead of the appearance, like "Submit form" instead of "Blue arrow button."
Decorative images that add nothing meaningful should have empty alt attributes (alt="") so screen readers skip them entirely instead of announcing noise.
2. Sufficient Color Contrast
Text needs enough contrast against its background for users with low vision or color blindness to read it. WCAG specifies minimum contrast ratios of 4.5:1 for normal text and 3:1 for large text (18 point or 14 point bold).
Those numbers are not arbitrary. They come from research on visual perception and legibility. Plenty of designs that look fine to people with typical vision become unreadable for users with visual impairments. Light gray on white, trendy low-contrast layouts, and text laid over busy image backgrounds routinely fail these requirements.
Use contrast checking tools, which are built into Chrome and Firefox developer tools, and available as free online checkers, to verify color combinations meet the required ratios.
3. Complete Keyboard Accessibility
Every interactive element on the site, including links, buttons, form fields, menus, and modal dialogs, has to be usable with the keyboard alone. Users navigate with the Tab key to move between elements, Enter or Space to activate them, and arrow keys for components like menus.
Test the site by putting away the mouse and using only the keyboard. Can you reach every interactive element? Can you activate every button and follow every link? Can you open and close menus? Can you complete forms and submit them?
Visible focus indicators are essential so keyboard users can see where they are on the page. Browsers ship default focus styles, and many designers remove them for visual polish without adding a replacement. That makes keyboard navigation impossible. Either keep the defaults or implement custom focus styles that are clearly visible.
4. Proper Form Labels
Every form field needs a label that is programmatically associated with it, meaning an HTML label element connected to the input through the "for" attribute, not just nearby text. Screen readers announce these labels when users land on a form field, so users know what to type.
Placeholder text is not a substitute for a label. Placeholders disappear once users start typing, leaving them without a reminder of what the field wants. Users with cognitive disabilities, or anyone interrupted in the middle of filling out a form, loses context. Always provide a visible label in addition to any placeholder.
5. Logical Heading Structure
Headings (H1 through H6) create the structure that screen reader users navigate by. Many blind users jump between headings to get an overview of the page, similar to how sighted users scan a page visually.
Use headings in logical order. H1 for the main page title, H2 for major sections, H3 for subsections, and so on. Do not skip levels (jumping from H2 to H4, for example), and do not use heading tags as a way to get larger or bolder text. Each page should have exactly one H1 that names the page's main topic.
6. Descriptive Link Text
Link text has to make sense out of context. Screen reader users often pull up a list of every link on a page, or tab through them one by one. In that view, "Click here," "Learn more," or "Read more" gives them no information about where the link leads.
Instead of "To learn about our services, click here," write "Learn about our web design services." Instead of "Read more," write "Read our guide to SEO basics." The link text alone should convey the destination. Good website copywriting naturally produces descriptive, meaningful link text.
Testing for Accessibility
Accessibility testing should combine automated tools with manual verification and, where possible, user testing with people who have disabilities.
Automated tools like WAVE, Google Lighthouse, and axe DevTools can scan pages and flag many common issues, including missing alt text, low contrast, missing form labels, and more. They are fast and catch the obvious problems, which makes them well suited for routine checks.
That said, automated tools can only catch roughly 30-40% of accessibility issues. They can confirm an image has alt text, and they cannot judge whether the alt text is meaningful. They cannot fully evaluate keyboard navigation flow, and they cannot tell whether content is genuinely easy to understand.
Manual testing fills in the rest. Navigate the site using only the keyboard. Turn on a screen reader (VoiceOver on Mac, NVDA or JAWS on Windows) and experience the site the way blind users do. Zoom the browser to 200% and see whether the layout still works, which matters most for mobile-first design. These manual checks surface problems automated tools miss.
The gold standard is testing with users who have disabilities. Watching someone who uses a screen reader every day navigate the site reveals friction points and opportunities no other testing method will catch.
A Warning About Accessibility Overlays
You may have come across accessibility overlay widgets, tools that claim to make a website accessible by adding a toolbar where users adjust fonts, colors, and other settings. These products are marketed heavily and look like an easy fix. They are not.
Overlay widgets do not fix the underlying code problems that make a website inaccessible. A screen reader will still stumble on missing alt text, broken heading structure, and inaccessible forms no matter what overlay you install. In some cases, overlays interfere with assistive technologies and make the experience worse for the users they claim to help.
Courts and regulators have not accepted overlays as evidence of accessibility compliance. Businesses using overlays have been sued successfully for accessibility violations. The disability community largely views overlay products negatively, treating them as bandaids that let companies avoid the underlying work.
Accessibility requires fixing issues at the code level. There are no shortcuts. Overlay products give a false sense of compliance while leaving the underlying barriers in place, and they may increase legal risk along the way.
Ready to make your website accessible to everyone? Let's discuss how to build accessibility into your site at the code level.