How accurate are CSS's real-world units?

StackOverflow https://stackoverflow.com/questions/7341808

  •  27-10-2019
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문제

I'm beginning experiments with CSS' real-world units, specifically, in and cm, for purposes of printing.

Are these units based on how they will be displayed on-screen or how they will be printed by a printer? How accurate are these units?

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해결책

According to W3C, only em, px and % are recommended for screen, the others for print.

Therefore, in a print application, the in and cm measurements could be precisely accurate.

There is an excellent article on such applications here:
http://meyerweb.com/eric/articles/webrev/200001.html

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