How does the front-end cut measure the distance between one line and the top or multiple lines with different line spacing in ps?

when I cut a picture, I always use a ruler to measure the distance between the top div of a line of text or the px of another line of text, but each line of text has its own inner margin. There must be some deviation in measuring with a ruler. How to solve this? Can"t sleep because you think about it?


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