I tried to embed a custom Google map like this:
But the discourse output in the message was just blank. Does anyone know if these kind of maps are supported or not?
Here is the code I used (generated by Google Map):
<iframe src="https://www.google.com/maps/d/embed?mid=za0Bx0koO4sk.kHCbG4TApEP4" width="640" height="480"></iframe>