Daniel Aleksandersen 10bdd912d6 Treat meta[property] as a space-separated list (#10604) ...

The @property attribute in HTML is a space-separated list of values.
This change normalizes whitespace and finds the desired value in
the list instead of requiring an exact single-value match.

More details:
https://www.ctrl.blog/entry/rdfa-socialmedia-metadata.html

2019-04-21 04:48:19 +02:00

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