The requirement for [=documents=] to be [=Document/fully active - descendant of a top-level traversable with user attention=] ensures that - orientation events are only delivered to - documents in windows that are both visible at the system level and have - the user's attention (either through focus or the ability to receive - keyboard input). The additional visibility state check provides defense - in depth. These restrictions prevent background tabs, hidden windows, - and minimized applications from collecting orientation data for - fingerprinting purposes. + descendant of a top-level traversable with user attention=] ensures + that orientation events are only delivered to documents in windows that + are both visible at the system level and have the user's attention + (either through focus or the ability to receive keyboard input). The + additional visibility state check provides defense in depth. These + restrictions prevent background tabs, hidden windows, and minimized + applications from collecting orientation data for fingerprinting + purposes.