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embeddedTextCaption

A Schema.org Property

This term is proposed for full integration into Schema.org, pending implementation feedback and adoption from applications and websites.
Thing > Property :: caption : embeddedTextCaption
Represents textual captioning from a MediaObject, e.g. text of a 'meme'.
Values expected to be one of these types
Text
Used on these types
AudioObject
ImageObject
VideoObject

Source

https://github.com/schemaorg/schemaorg/issues/2450