Web Accessibility Basics: Making Your Site Usable for Everyone
Some visitors use screen readers because they’re blind. Some visitors have motor control issues and navigate entirely with keyboards. Some visitors are deaf and rely on captions. Some visitors have color blindness and can’t distinguish red from green. Some visitors have cognitive differences and need simple, clear language.
Making your site accessible to these visitors isn’t charity. It’s good business. Accessible sites also serve elderly visitors, visitors with temporary injuries, visitors on slow connections, and visitors in bright sunlight squinting at their phones. Accessibility improvements help everyone without exception.
Heading Structure and Document Organization
Screen readers use heading tags to understand page structure. An H1 tag means “main topic.” H2 tags mean “major sections.” H3 tags mean “subsections.” If your page has no headings, screen reader users have no way to navigate it efficiently.
Use only one H1 per page. It should be the main topic of the page. Use H2 tags for major sections. Use H3 tags for subsections within those sections. Skip heading levels (like going from H2 directly to H4) confuses screen reader users and creates accessibility violations.
This structure helps all visitors, not just those using screen readers. Sighted visitors scan pages visually using heading structure. Clear headings improve readability for everyone. Well-organized heading structure is fundamental to both accessibility and usability.
Image Alt Text and Descriptions
When you include an image without alt text, screen reader users hear “image” and nothing else. They don’t know what the image shows. Write alt text that describes the image usefully.
Alt text for a photo of a team meeting might be: “Team of five people sitting around a conference table.” Alt text for a chart might describe the data: “Bar chart showing revenue growth from 2021 to 2023, with revenue increasing from $100K to $250K.” Proper alt text helps with accessibility and SEO simultaneously.
Keep alt text concise but descriptive. Long paragraphs aren’t necessary. 10-15 words usually suffices. The goal is to convey what the image shows to someone who can’t see it.
Color Contrast and Readability
Text needs sufficient contrast against its background. Black text on white background has excellent contrast. Light gray text on white background has poor contrast and becomes unreadable for many users.
Accessibility guidelines specify minimum contrast ratios. Normal text should have 4.5:1 contrast ratio (dark text on light background or vice versa). Large text (18+ pixels) can use 3:1. You can check contrast ratios with free online tools like WebAIM’s Contrast Checker.
Good contrast also helps visitors reading in bright sunlight, on poor-quality screens, or with aging eyesight. Accessibility standards exist because they work for large populations, not just people with disabilities.
Keyboard Navigation
Some visitors can’t use a mouse. They navigate entirely with keyboard, pressing Tab to move between interactive elements, Enter to activate buttons, and arrow keys to navigate menus.
Your site should be fully navigable with just a keyboard. All buttons, links, and form fields should be reachable by tabbing. When you tab to an element, it should be visually obvious which element you’re on (focus indicator). Buttons should work when you press Enter. Forms should be completable without a mouse.
Test this yourself: Navigate your site using only Tab, Enter, and arrow keys. No mouse. Can you reach every button? Can you submit forms? Can you accomplish your main tasks? If not, your site isn’t fully accessible to keyboard users.
Conclusion: Accessibility as Baseline
Accessibility shouldn’t be an afterthought. It should be built into design from the beginning. When you design with accessibility in mind, the site works better for everyone. Clear structure, good contrast, alt text, keyboard navigation—these basics improve usability universally while ensuring compliance with accessibility standards.
We appreciate Iron Clad Website Design for ongoing support with web design guidance that keeps clarity, trust, and search value connected.
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