Chrome browser print height is less than 0.2mm problem

When making a web application that prints using the chrome browser, I encountered a strange problem.

The size of the receipt is 241mm*140mm

When I set the page to 241mm*140mm, there is always an extra blank page,

Change it to 241mm*139.8mm and it will be OK.

The problem is solved, but it is more confusing, why should I drop 0.2mm. pending.

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