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  1. Moodle
  2. MDL-52391

Colors in fontcolor plugin for Atto HTML editor lack sufficient color contrast

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      Description

      Font colors in the fontcolor plugin for the Atto HTML editor lack sufficient color contrast with the default background color.

      WCAG 2.0 level AA requires a contrast ratio of 4.5:1 for normal text and 3:1 for large text (18 point or larger). Level AAA requires a contrast ratio of 7:1 for normal text and 4.5:1 for large text. See WCAG 2.0 Guideline 1.4.1.

      Current contrast ratios:
      Red contrast ratio: 3.75:1 (fails level AA and AA for normal text; fails AAA for large text)
      Yellow contrast ratio: 1.48:1 (fails level AA and AA for normal text; fails AA and AAA for large text)
      Green contrast ratio: 1.48:1 (fails level AA and AA for normal text; fails AA and AAA for large text)
      Blue contrast ratio: 1.48:1 (fails level AA and AA for normal text; fails AA and AAA for large text)

      These colors are in conformance with the Web Content Accessibility requirements at the AAA Level:

      • Red: #a20000
      • Green: #006000
      • Blue: #004d83
      • Purple: #800080
      • Magenta: #980068
      • Gray: #3c3c3c

      Tests were conducted with the Paciello Group’s Colour Contrast Analyser and with WebAIM’s Color Contrast Checker.

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