TYPO3 Core

Actually I could work only on the minified version of TYPO3 BE modal.js.

To close the modal with a click outside the modal content I added:

r.on("click",function(t){$(t.target).hasClass("modal-dialog")&&r.modal("hide")})

to 'shown.bs.modal' event.

Practically:
after the modal is shown, when user clicks on modal, if the target of the click is '.modal-dialog' (so everything outside '.modal-content') then hide the modal.

Am I wrong or the "close on click outside" is the standard behavior of Bootstrap's modals? My guess is that it has been removed on purpose (Mind, mine is just a guess).

I tested this on main (34e8e51) and all of the modals I tested (content elements, link browser, etc.) closed when clicking outside the modal content.

Is there are specific one this didn't work for or was it any modal?

If latter was the case when this was created, this is already working now.