Color Glossary

A sufficient difference in luminance between foreground and background colors that ensures readability for users with visual impairments.

6 articles

A condition in which a person has reduced ability to distinguish between certain colors, affecting approximately 8% of males and 0.5% of females worldwide.

A type of red-green color blindness caused by the absence of green-sensitive cone cells, making it difficult to distinguish between red and green hues.

56 articles

Text that is at least 18 points (24px) in regular weight or 14 points (approximately 18.66px) in bold weight, qualifying for relaxed contrast requirements under WCAG.

The first principle of WCAG, requiring that all information and user interface components are presentable to users in ways they can perceive.

6 articles

A type of red-green color blindness caused by the absence of red-sensitive cone cells, making reds appear dark and difficult to distinguish from greens and browns.

43 articles

A rare type of blue-yellow color blindness caused by the absence of blue-sensitive cone cells, making it difficult to distinguish between blue and yellow hues.

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The enhanced conformance level of WCAG, requiring a contrast ratio of at least 7:1 for normal text and 4.5:1 for large text.

The standard conformance level of WCAG, requiring a contrast ratio of at least 4.5:1 for normal text and 3:1 for large text.

1 article

An international standard published by the W3C that defines how to make web content accessible to people with disabilities, including specific criteria for color contrast.

1 article