Looking for clarification whether or not a Photo Card supports the twitter:description field?
According to the info page for Photo cards located at https://dev.twitter.com/docs/cards/types/photo-card - the description is an optional field but is used to build the card. However, when using the development validator at https://dev.twitter.com/docs/cards/validation/validator to building a card manually, the field is not present. Additionally, when validating server generated markup, there is no mention of the description field in the parse results. Finally, the Tag Reference page reference for Photos makes no reference to description being part of Photo cards.
