webcolour /

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webcolour offers some simple tools for checking the accessibility of web colours. It provides functions to parse web colours expressed in a hexadecimal format, compute the contrast ratio between two colours and determine the level of WCAG 2.0 conformance.

The WCAG 2.0 Luminosity Contrast Ratio algorithm is used; for more details, see Guideline 1.4.3 and the glossary definitions of contrast ratio & relative luminance in the WCAG 2.0 document,

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