Definition
Indicates that the author has not yet checked if the resource contains accessibility features.
Examples
Example 1 — EPUB 3
<meta property="schema:accessibilityFeature">
unknown
</meta>
Example 2 — EPUB 2
<meta name="schema:accessibilityFeature"
content="unknown"/>
Example 3 — Audiobooks
"accessibilityFeature": ["unknown"]
Explanation
The unknown
value indicates the accessibility features of a publication are not known. Only use this value
when a publication has not been evaluated for accessibility as it is not useful for readers.
Do not use the unknown
value with any other accessibility feature values.
Related Links
- Schema.org — accessibilityFeature
- Schema.org Accessibility Vocabulary — unknown