We use modals extensively in one of our apps that uses Wicket 6.x but the HTML rendered is obviously not tailored for bootstrap and so the modal does not act responsively (responsibly :) ) on smaller devices.
I'm aware of the excellent Wicket - Bootstrap library (as we use that on another project) but this project does not use Wicket - Bootstrap (well not "yet" at least). I know it's possible to customize the CSS for a modal in core wicket but is it possible/easy to, say, have the html customized so that the sections of the modal can rendered with: modal-header modal-body modal-footer which I think is all that is needed to get the modals behaving responsively in bootstrap?
