OGP
The Open Graph protocol
https://ogp.me/
og:title
og:type
og:image
og:url
table:Basic Metadata
og:title The title of your object as it should appear within the graph, e.g., "The Rock".
og:type The type of your object, e.g., "video.movie". Depending on the type you specify, other properties may also be required.
og:image An image URL which should represent your object within the graph.
og:url The canonical URL of your object that will be used as its permanent ID in the graph, e.g., "https://www.imdb.com/title/tt0117500/".
authorとかBasicに無いんだな
article:author
article - Namespace URI: https://ogp.me/ns/article#
profile:username
profile - Namespace URI: https://ogp.me/ns/profile#
などが一応あるが
#プロトコル