[techaqua]

and also opengraph meta tags https://ogp.me/

[doodlesdev]

And also schema.org: https://schema.org/

[westurner]

Thing > CreativeWork > WebSite https://schema.org/WebSite ... scroll down to "Examples" and click the "JSON-LD" and/or "RDFa" tabs. (And if there isn't an example then go to the schema.org/ URL of a superClassOf (rdfs:subClassOf) of the rdfs:Class or rdfs:Property; there are many markup examples for CreativeWork and subtypes).

httpS://schema.org/license

Also: https://news.ycombinator.com/item?id=35891631

extruct is one way to parse linked data from HTML pages: https://github.com/scrapinghub/extruct