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
- Schema.org — accessibilityFeature
- Schema.org Accessibility Vocabulary — highContrastDisplay