[busymom0]

Is watching a video considered "input"? And are these regulations enforced as default settings and do users have the ability to customize the settings? Or do they want the manufacturers to disable customization too?

[SahAssar]

It says inactivity, not input. Generally doing thinks like watching video is considered an activity.

[MrStonedOne]

it can be taken to mean two things.

the monitor itself has to go to standby if the port it is switched to has no input (as in, the computer is not outputting anything on that port)

and

the computer has to switch the monitor into standby mode on user inactivity.