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About this glossary

Accessibility – Glossary

Make your website usable for everyone. Accessibility helps people with different devices, abilities, and contexts consume your content.

What it covers

  • Alt text for images.
  • Color contrast for readability.
  • Visible focus states.
  • Keyboard navigation and skip links.
  • Clear forms and error messages.

Why it matters

  • Improves usability for all users.
  • Reduces legal and compliance risk.
  • Helps SEO through better structure and semantics.
  • Builds trust and professionalism.

Quick checks

  • Images have clear, concise alt text.
  • Text contrast meets WCAG AA.
  • Links and buttons show a visible focus state.
  • You can tab through the page in a logical order.
  • There is a “Skip to content” link.
  • Form fields have labels, instructions, and helpful errors.

Practical tips

  • Write alt text that explains purpose, not just appearance.
  • Use headings in order. H1, then H2, H3.
  • Avoid “click here.” Use descriptive link text.
  • Don’t rely on color alone to show state. Add icons or text.
  • Keep form validation messages clear. Say what went wrong and how to fix it.

Further reading

Standard

WCAG 2.2 Overview, W3C WAI

Core accessibility standard with success criteria and techniques, the benchmark for compliance.

https://www.w3.org/WAI/standards-guidelines/wcag/

Guide

WAI Tutorials, W3C WAI

Practical how tos for images, forms, tables, page structure, and media, good for implementation.

https://www.w3.org/WAI/tutorials/

Guide

WAI ARIA Authoring Practices, W3C

Keyboard interactions, roles, and patterns for interactive components, avoid ARIA misuse.

https://www.w3.org/WAI/ARIA/apg/

Guide

WebAIM Articles

Plain language explanations of alt text, contrast, landmarks, and forms, ideal for quick learning.

https://webaim.org/articles/

Components

GOV.UK Design System

Accessible components and content patterns used at scale, copyable examples and guidance.

https://design-system.service.gov.uk/

Law

Accessible Canada Act, Government of Canada

Federal requirements and guidance for accessibility in Canada, useful for Canadian audiences.

https://www.canada.ca/en/employment-social-development/programs/accessible-canada.html

Related terms

Web Content Accessibility Guidelines (WCAG)

Standards for accessible content, levels A to AAA used to benchmark sites. Related articles Website Content Planning ...

Alt text

Alt text is a short, plain‑language description of an image. Screen readers read it out loud. Search engines use it t...

Forms UX

Clear errors, sensible validation, and progressive disclosure that make forms easier to complete. Related articles Th...

Category:
Category
Content strategy and UX
· Accessibility

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About this glossary

I’m building this glossary to become a better developer and website strategist, in my ongoing quest to build clearer, better websites. It maps how terms relate, adds practical examples, and highlights best practices so I can communicate more clearly with clients. If it helps others too, great.

It’s a living resource, I aim to cite sources clearly. If you spot errors or omissions, please contact me so I can update it. Drafts may be assisted by AI, I review and fact check before publishing. For details on how I use AI, see AI Use at Webmarks.