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1.4.3 Contrast (Minimum) [Level AA]

Description

Contrast (Minimum):

1.4.3 The visual presentation of text and images of text has a contrast ratio of at least 4.5:1, except for the following: (Level AA)Understanding Success Criterion 1.4.3

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Sufficent Techniques

Advisory Techniques

Advisory Techniques for 1.4.3 - Contrast (Minimum)
  • G156: Using a technology that has commonly-available user agents that can change the foreground and background of blocks of text

  • Using a higher contrast value for text that is over a patterned background (future link)

  • Using Unicode text and style sheets instead of images of text (future link)

  • Using a higher contrast values for lines in diagrams (future link)

  • Using greater contrast level for red-black text/background combinations (future link)

  • Using colors that are composed predominantly of mid spectral components for the light and spectral extremes (blue and red wavelengths) for the dark

  • Using a light pastel background rather than a white background behind black text to create sufficient but not extreme contrast (future link)

  • Making icons using simple line drawings that meet the contrast provisions for text (future link)

  • Providing sufficient contrast ratio in graphs and charts (future link)

  • Using a 3:1 contrast ratio or higher as the default presentation (future link)

  • Providing sufficient color contrast for empty text fields (future link)

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Failures

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Notes

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