discourse/discourse — pull request #2973 by lidel (2014-11-17 13:34:09+00:00)
Title: UX: whitelist OpenStreetMap iframes

This PR enables users to paste iframe code provided by *Share->HTML* menu on the http://openstreetmap.org

Rationale:

- Google Maps got whitelisted in 2013. OSM is an open alternative.
- https://meta.discourse.org/t/openstreet-maps-embedding/21175