Units of measurement

In what units are properties measured in INSERT - TRANSFORM ?

Rotation is measured in degrees. The rest should be pixels or a 0-1 scale. Let me confirm with @martinb

The rest are clearly measured not in pixels, but in some fractions.

Those would be your 0-1 scale.

What scale?

Zero to one where one is a “100%” value and 0 is none. Again though, let me confirm with @martinb

Correct.

A scale of 1 is 1:1. A scale of 2 is twice the size. A scale of 0.5 is half.

A Position Х, Y in what units is measured ?