Definition
Content features of the resource, such as accessible media, supported enhancements for accessibility and alternatives.
Examples
Example 1 — EPUB 3
<meta property="schema:accessibilityFeature">captions</meta>
<meta property="schema:accessibilityFeature">alternativeText</meta>Example 2 — EPUB 2
<meta name="schema:accessibilityFeature" content="captions"/>
<meta name="schema:accessibilityFeature" content="alternativeText"/>Example 3 — Audiobooks
"accessibilityFeature": ["captions", "alternativeText"]Example 4 — HTML with RDFa
<p>Video includes
<span property="accessibilityFeature">captions</span>.</p>Example 5 — HTML with microdata
<p>Video includes
<span itemprop="accessibilityFeature">captions</span>.</p>Values
The following values are used to identify features of the content that are helpful for accessibility.
Note
Unless the metadata format used supports lists (e.g., JSON-LD), use a separate property declaration for each feature. Do not merge the values into a single property using spaces, commas, or other delimiters.
- alternativeText
- annotations
- ARIA
- audioDescription
- bookmarks (deprecated)
- braille
- captions (deprecated)
- ChemML
- closedCaptions
- describedMath
- displayTransformability
- fullRubyAnnotations
- highContrastAudio
- highContrastDisplay
- horizontalWriting
- index
- largePrint
- latex
- longDescription
- MathML
- none
- openCaptions
- pageBreakMarkers
- pageNavigation
- readingOrder
- rubyAnnotations
- signLanguage
- structuralNavigation
- synchronizedAudioText
- tableOfContents
- tactileGraphic
- tactileObject
- taggedPDF
- timingControl
- transcript
- ttsMarkup
- unknown
- unlocked
- verticalWriting
- withAdditionalWordSegmentation
- withoutAdditionalWordSegmentation
Related Links
- Schema.org — accessibilityFeature
- Schema.org Accessibility Vocabulary — accessibilityFeature
- IMS Global — Access For All (AfA) Digital Resource Description Specification Information Model Version 3.0 Specification