Is it possible to do modal forms in Backdrop? I have a site on D8 which does have that feature, but of course Backdrop was forked off D7. I don't see anything about modals / popups in the Webform configuration (either at module or form level) though.
If the feature does exist, how do I use it?
Thanks!
I don't know about Webform, but modal dialogs are in core and very easy to do in Backdrop. See:
https://docs.backdropcms.org/change-records/dialog-api