Improving accessibility in software development is more than just ticking a compliance checkbox—it's about making sure your application or website can be used by as many people as possible, including those with disabilities. Accessibility (often abbreviated as a11y) means designing and building digital experiences that everyone can navigate, understand, and interact with, regardless of their physical abilities, device, or environment.
In my experience, improving accessibility is a continuous process that touches everything from design and front-end code to testing and deployment. It’s not just about adding ARIA attributes or alt text; it’s about thinking inclusively from the start and embedding accessibility into your development workflow.
At its heart, accessibility is about removing barriers. These barriers can be visual, auditory, motor, or cognitive. The Web Content Accessibility Guidelines (WCAG) provide a solid framework, focusing on four main principles:
These principles guide how we write HTML, CSS, and JavaScript to ensure compatibility with screen readers, keyboard navigation, voice commands, and more.
Here are some concrete steps I follow when improving accessibility in a project:
Using semantic HTML elements is the foundation. Instead of using generic <div> or <span> tags for everything, I use <nav>, <header>, <main>, <button>, <form>, and so on. This helps assistive technologies understand the structure and purpose of the content.
<button type="submit">Submit</button>
<nav>
<ul>
<li><a href="#home">Home</a></li>
<li><a href="#about">About</a></li>
</ul>
</nav>
Common mistake: developers often use div or span with click handlers to mimic buttons or links, which breaks keyboard accessibility and screen reader semantics.
Many users rely on keyboards or alternative input devices. Ensuring all interactive elements are reachable and operable via keyboard is critical. This means:
<button>, <input>).Example of managing focus in a modal:
function openModal() {
const modal = document.getElementById('modal');
modal.style.display = 'block';
modal.setAttribute('aria-hidden', 'false');
modal.querySelector('button.close').focus(); // Move focus to close button
}
Common mistake: trapping focus incorrectly or forgetting to return focus to the triggering element after closing a modal.
ARIA (Accessible Rich Internet Applications) attributes help fill gaps where native HTML falls short, especially in complex widgets like tabs, accordions, or custom controls.
For example, a custom tab component might use:
<div role="tablist">
<button role="tab" aria-selected="true" aria-controls="panel1" id="tab1">Tab 1</button>
<button role="tab" aria-selected="false" aria-controls="panel2" id="tab2">Tab 2</button>
</div>
<div role="tabpanel" id="panel1" aria-labelledby="tab1">Content 1</div>
<div role="tabpanel" id="panel2" aria-labelledby="tab2" hidden>Content 2</div>
However, ARIA should never replace semantic HTML but rather enhance it when necessary.
Accessibility isn’t just about screen readers. Visual impairments like color blindness or low vision require sufficient color contrast between text and backgrounds. WCAG recommends a contrast ratio of at least 4.5:1 for normal text.
Tools like WebAIM Contrast Checker or browser extensions help verify this.
Common mistake: relying solely on color to convey information (e.g., error messages only highlighted in red without icons or text labels).
All meaningful images should have descriptive alt attributes. Decorative images should have empty alt attributes (alt="") so screen readers skip them.
Example:
<img src="profile.jpg" alt="Photo of Jane Doe smiling">
Common mistake: using generic alt text like "image" or leaving alt empty on informative images.
Accessibility also means your app works well on different screen sizes and input types. Responsive design ensures content scales properly, and touch targets are large enough (at least 44x44 pixels).
Additionally, testing with screen readers on mobile devices (VoiceOver on iOS, TalkBack on Android) is essential because behavior can differ from desktop.
Accessibility features generally have minimal impact on performance, but there are some nuances:
Balancing accessibility with performance means writing clean, semantic markup and minimizing heavy JavaScript where possible.
Accessibility and security sometimes intersect. For example:
aria-live regions to announce dynamic content should be done carefully to avoid exposing sensitive information unintentionally.| Mistake | Why It Happens | Impact | How to Avoid |
|---|---|---|---|
Using div or span for buttons or links |
Trying to style elements without semantic constraints | Breaks keyboard navigation and screen reader support | Use native elements like <button> and <a> whenever possible |
| Missing alt text on images | Forgetting or not understanding alt attribute importance | Screen reader users miss important content | Always add meaningful alt text or empty alt for decorative images |
| Incorrect use of ARIA roles | Misunderstanding ARIA or overusing it | Confuses assistive technologies, making navigation harder | Use ARIA only when native HTML can’t achieve the goal |
| Poor focus management in modals/dialogs | Not handling keyboard focus properly | Keyboard users get trapped or lost in UI | Implement focus traps and return focus after close |
| Relying on color alone to convey information | Designers not considering colorblindness | Users miss important cues | Use icons, text labels, or patterns along with color |
When asked about accessibility in interviews, focus on practical experience and understanding rather than just definitions. Interviewers want to hear how you:
Sharing examples from your projects where you fixed accessibility issues or improved usability for disabled users can really set you apart.
| Approach/Tool | Use Case | Pros | Cons |
|---|---|---|---|
| Semantic HTML | Basic structure and content markup | Native support by browsers and assistive tech, simple | Limited for complex widgets |
| ARIA Attributes | Enhance complex UI components | Improves screen reader support for custom controls | Can be misused, adds complexity |
| Automated Testing Tools (axe, Lighthouse) | Quick accessibility audits | Fast feedback, integrates with CI/CD | Cannot catch all issues, false positives/negatives |
| Manual Testing (Screen Readers, Keyboard) | Real user experience validation | Finds nuanced issues automated tools miss | Time-consuming, requires expertise |
In one project, we had a complex dashboard with drag-and-drop widgets and dynamic content updates. Initially, it was unusable by keyboard-only users and screen readers. To fix this, we:
This not only improved accessibility but also made the app more maintainable and user-friendly overall.
Accessibility is often seen as extra work, but in reality, it leads to cleaner code, better UX, and broader reach. It’s a skill every developer should cultivate, and sharing your hands-on experience with it during interviews will definitely make you stand out.