Chrome OS

How do I take a screenshot on my Chrome OS device (e.g. Chromebook or Chromebox)?

hold down ctrl and press []]] = Your Chrome OS device captures the entire screen and saves it as a file into your Downloads folder.
or
hold down ctrl and press F5

How do I take a partial screenshot?

hold down ctrl and shift and press []]] = Use your mouse to draw a rectangle. Your Chrome OS device then saves it as a file into your Downloads folder.
or
hold down ctrl and shift and press F5

If it works, what does it look like?

Chrome OS says “Screenshot taken”

Can you show me in a video?