WCAG 2.0 Navigation and Layout Requirements

1.3.3 Sensory Characteristics
Instructions provided for understanding and operating content do not rely solely on sensory characteristics of components such as shape, size, visual location, orientation, or sound. (Level A)
1.4.1 Use of Color
Color is not used as the only visual means of conveying information, indicating an action, prompting a response, or distinguishing a visual element. (Level A)
1.4.3 Contrast (Minimum):
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)
  • Large Text: Large-scale text and images of large-scale text have a contrast ratio of at least 3:1
  • Incidental: Text or images of text that are part of an inactive user interface component, that are pure decoration, that are not visible to anyone, or that are part of a picture that contains significant other visual content, have no contrast requirement.
  • Logotypes: Text that is part of a logo or brand name has no minimum contrast requirement.