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I have an HP Envy M6 with a USB 3.0 port next to its charging port, doesn't matter what state the Laptop is in, Sleep, Hibernated, and completely powered down. It never stops charging whatever phone is connected to it via that particular USB port.
I can't seem to get around the physics behind what really happens, but it does look like that port holds some amount of electricity to charge the phone no matter what state the laptop's in and this only works for the port next to the charging port.
What's the phenomenon behind what happens?
1Phenomenon and advanced principle of physics: The designer was drunk and/or stupid and either figured out how to save a few cents on every unit or overlooked a flaw that allows the port to be powered from the battery when the power is off. If or when it's discovered, it will be labelled a design feature that enables you to charge your phone when the power's off. – fixer1234 – 2015-10-14T08:18:55.197