This button couldn't be customized, otherwise it's useless as someone could easily get away with hiding it / showing only a small portion of it where someone co

This button couldn't be customized, otherwise it's useless as someone could easily get away with hiding it / showing only a small portion of it where someone could click without even noticing / etc. Maybe a small modal-like confirmation that can be placed anywhere on the viewport and is actually on top of everything natively (like Safari's copy/paste on iOS). Of course, this modal-like confirmation must not be customized or its effect is useless. Or let's just forget entirely and remove the functionality from the browsers.