Essentially "What's the current draw and supply voltage tolerance?" but for newer models.
If you don't want to click links, the Raspberry Pi can handle
As for the current draw/power consumption, here are some numbers:
All of these are bare-bone (does not have any peripherals/accessories attached) *** Fun Fact (Tested on Pi1 B+) *** Any turned-off Raspberry Pi that's still plugged in: 75 mA *** Idle *** Raspberry Pi 2 B: 420mA Raspberry Pi B+: 230-240mA Raspberry Pi B: 320-330mA Raspberry Pi A+: 180-240mA Raspberry Pi A: 120-140mA Raspberry Pi Zero: 60-70mA Raspberry Pi Zero W: 100ma Raspberry Pi 3 B: 280-320mA *** Under Load/Max *** Raspberry Pi 2 B: 450-650mA Rasbperry Pi B+: 300-600mA Raspberry Pi B: 380-450mA Raspberry Pi A+: 200-300mA Raspberry Pi A: 170-300mA Raspberry Pi Zero: 120-150mA Raspberry Pi Zero W: 160-230mA Raspberry Pi 3 B: 500-800mA
Take note that some of them have a bit of give-or-take.
Also take note that you will rarely reach these numbers in the real world. These measurements are based on stress tests that maxes out the unit.
For current draw I doubt you'll find anything more official than http://www.raspberrypi.org/help/faqs/#powerReqs
On the voltage side the only official comment made will be use the USB specs of 4.75V to 5.25V.
However if you look on the official site at http://www.raspberrypi.org/help/faqs/#powerBatteries you will see that as far as damage to the Pi is concerned approaching 6V is the real danger.
The MagPi, Issue 56 got these numbers for the power usage of the B+, 2B, 3B, and Zero (note the test conditions include additional peripherals):
1B+ 2B 3B Zero Boot Max 0.26A 0.40A 0.75A 0.20A Avg 0.22A 0.22A 0.35A 0.15A Idle Avg 0.20A 0.22A 0.30A 0.10A Video playback (H.264) Max 0.30A 0.36A 0.55A 0.23A Avg 0.22A 0.28A 0.33A 0.16A Stress Max 0.35A 0.82A 1.34A 0.35A Avg 0.32A 0.75A 0.85A 0.23A
Test conditions used a standard Raspbian image (26 Feb 2016), at room temperature, connected to an HDMI monitor, USB keyboard, and mouse. For the Model 3B it was connected to a WiFi access point. All these power measurements do not take into account power consumption from additional USB devices; these measurements can easily be exceeded with multiple additional USB devices connected or when using a HAT.
Some additional resources to list the power consumption of the numerous models of the Pi and different load cases:
So the reported numbers are as low as 80..100 mA for an idling A+ and 180..200 mA for the B+.
The voltage range is mostly important for USB peripherals. The pi itself runs at 3.3v, the 5v is only used by the USB. USB standard is +/-5%.