Refined-github: Add hover-cards for popular website-links in comments

[staabm]

could refined github add popup/hover-cards for popular urls, like e.g. twitter

expected result:
a url like https://twitter.com/markusstaab/status/1197832308470034433 when used in e.g. a comment should open a card-overlay on mouse-over.
the card-overlay could/should contain the schema.org defined properties like og:title, og:image, og:description etc. like e.g. popular chat systems do (slack, mattermost)

that way people can get a impression on what the actual link will provide/contain without leaving github.com

example how mattermost renders a similar feature:

this feature could be used for several services (as long as the og:* schema is supported by the website) but should not open hover-cards for all links (for security reasons) but just whitelisted domains.

examples I can think of righw now are

• stackoverflow
• medium

[busches]

This seems something that should exist as it's own extension and apply to multiple websites.

[fregante]

I totally thought about the same thing. This is a big feature and it would have to include an open graph parser and wide permissions to fetch each page.

[fregante]

Interesting feature nonetheless. Perhaps suggest it to https://github.com/sindresorhus/module-requests