A human-readable summary of specific accessibility features or deficiencies, consistent with the other accessibility metadata but expressing subtleties such as "short descriptions are present but long descriptions will be needed for non-visual users" or "short descriptions are present and no long descriptions are needed."
The summary is a brief, human-readable summary of any information that cannot be expressed through the other schema.org metadata. It can be used, for example, to indicate accessibility features beyond the level of the conformance claim (e.g., it might specify ways in which the publication meets WCAG level AAA success criteria).
The property should not be a repetition of the conformance claim or simply restate the accessibility features and hazards, as this will often result in the information be repeated to users.
If the summary does not offer any new information, the property can be omitted from digital publications.
If a publication fails to meet accessibility standards, publishers can use the property to point out the reasons. The publication may still be usable for many readers depending on the failures.