Definition

Content meets the visual contrast threshold set out in WCAG Success Criteria 1.4.6.

Examples

Example 1 — EPUB 3
<meta property="schema:accessibilityFeature">
   highContrastDisplay
</meta>
Example 2 — EPUB 2
<meta name="schema:accessibilityFeature"
      content="highContrastDisplay"/>
Example 3 — Audiobooks
"accessibilityFeature": ["highContrastDisplay"]

Explanation

The highContrastDisplay value is used to indicate that there is at least a 7:1 contrast ratio between the foreground text and the background, including for images of text (see WCAG success criterion 1.4.6).

High contrast display is helpful for users with moderately low vision or with color deficiencies.

ONIX Mapping

The highContrastDisplay value maps to list 196 code 37 ("Use of ultra-high contrast between text foreground and background").

Related Links