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Guideline 2 :
Don't rely on color alone

Checkpoint 2.1 - Result: needs checking

Ensure that all information conveyed with color is also available without color, for example from context or markup. [Priority 1]

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Colors: Verify that information is not transmitted only through color.

• Instructions:
  Verify if important or functional information is transmitted only through color (for example, indications like "red colored articles are offers").
  [Close instructions]

Checkpoint 2.2 - Result: needs checking

Ensure that foreground and background color combinations provide sufficient contrast when viewed by someone having color deficits or when viewed on a black and white screen. [Priority 2 for images, Priority 3 for text].

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Color contrast: Check that color contrast between background and foreground (in text and images) is enough.

• Instructions:
  HERA provides an independent utility that will facilitate you to check if background and foreground color combinations contrast enough, by applying the verification algorithm proposed by W3C.
  [Close instructions]

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