but ".paginate_button" a as selector should be fine. 

But where have you added the external workaround here?

https://www.rosentreter.website/grampspublic/persons.html

But I don't know if you like the overhead of the external workaround. 

adding a click event there directly is also possible. But this requires some custom code...

Best, Michael

Also your page in the iframe all is done in Javascript. So this might not be trivial. Because of delays, not existing elements at the time of rendering ....

OK I've found that it's a bug in the Gramps software that will be fixed in the next release...

Good to know :).