(http://www.openstreetmap.org).
This is the HTML but from a text editor so I have spread it out a bit to make the coordinate stuff more obvious.

LOCAL


View Larger Map

The call to view larger map = 19/51.202667/-2.677019 works OK but the coordinates for use in the window on the web site do not seem to include an altitude.

Have also noticed that in Openstreetmap if you start off zoomed in close and then use the +/- to zoom out you loose precision and when you zoom back in the map center has mover by a few miles. If you have a pointer set this same process moves the map center by over a hundred miles because center on the pointer looses even more precision.