Meta Tag Validator

[aciccarello]

Similar to link preview validators from Facebook and Twitter, IndieWebify.Me should have a validator that shows what meta tags are commonly understood. It would serve as a reference implementation of meta tag parsing broadly across the web but also what IndieWeb sites would use in reply contexts. It probably be tied to metaformats as the reference implementation/parsing spec.

It should highlight what values were understood (e.g. title, date, etc.) as well as show an example h-cite for how that might be rendered.

This validator could incorporate #104 and list which tags aren't needed.

This was discussed today at IndieWebCamp San Diego.