It would be useful to have a way to display a map or link to a map.
Currently most websites use an embed or direct link to Google Maps, but this is specific for Google (not a standard) and comes with possible restrictions.
It would be interesting to allow the device to decide what app use for maps.
I see two alternatives:
Add a protocol like location: to a elements (something similar to tel:, mailto:) and the browser decides which is the app to open