Glossary

A comprehensive website monitoring glossary of accessibility terms.

POUR principles

What are POUR principles? Here's how WCAG POUR principles group every accessibility guideline into perceivable, operable, understandable, and robust.

aria-describedby

aria-describedby is the ARIA attribute that adds descriptive text for screen readers. See an aria-describedby example and aria-describedby vs. aria-label.

aria-labelledby

aria-labelledby is an ARIA attribute that builds an accessible name from other elements' text. Compare aria-label vs. aria-labelledby, plus an HTML example.

Digital accessibility

Wondering what digital accessibility is and why digital accessibility is important? Here's the definition, standards, examples, and best practices.

Braille display

Wondering, “What is a braille display?” It converts on-screen text into raised braille dots so blind and low-vision users can read digital content.

A11y

A11y is the numeronym for accessibility: a shorthand for building digital products that work for people with disabilities.

Alt text

Wondering what alt text is? It's the description behind an image that screen readers announce and search engines use for context – see examples.

aria-label

An ARIA label is an HTML attribute that gives screen readers an accessible name. Here's what an aria label is, an example, and best practices.

aria-hidden

aria-hidden is an ARIA attribute that hides content from screen readers without hiding it visually. Here's what it does, an example, and common mistakes.