[Feature Request] Javascript events for how much margin was added to the body

[TivoSoho]

Issue is that we have other elements that have fixed positions at the bottom, so we either show them on top of debugbar (not nice looking) or we may miss those notifications when debugbar is open (again not cool due to missing info). Would be nice if we had an event we could observe that will tell us how much margin was added to the body to accommodate the debugbar size and add it accordingly to our own elements (for us it is some toast messages currently), or any other available info that we could use to adjust our layout when using it.