Glossary

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This glossary covers a wide range of topics and includes terms that describe people, technology, concepts, and more. Some of the terms, marked by this icon , are widely considered to be

This term is generally agreed to be offensive toward or a person or group of people. We strongly recommend you do not use this term and instead use a term not usually thought to be offensive. While it is possible that some people will not be offended by this term, just as some people will be offended by other terms when no harm is intended, it is best to avoid. Remember that what is considered offensive can also change over time, by scenario, and by relationship. We provide this library of terms for informational purposes and we welcome feedback to help us get it right.

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  • Landmark (role)

    This is a role used to describe important sections of content that users are likely to want to access. Proper...

  • Level AAA (compliance)

    AAA WCAG compliance is viewed as the gold standard level of accessibility. To reach this level, you must meet all...

  • Level AA (compliance)

    To meet WCAG 2.0 Level AA conformance, the website must meet Level A requirements and be considered usable and...

  • Level A (compliance)

    This is the minimum level of compliance to the WCAG 2.1 guidelines. Level A Minimal compliance. This level defines...

  • Luminance Contrast Ratio

    Luminance ratio is a term used for the useful contrast of a display, the perceived contrast in the context of the...

  • Long description

    A longer form of alternative text for non-text elements that should be able to serve as a full substitution for...

  • Low Vision

    Condition of having some level of usable vision but having a vision problem that can't be corrected and makes it...