Some problems about the design of front-end pixels

in the process of page development, we often see that the values of some front-end design pixels are accurate to the decimal point. How is this calculated? Is there any basis? Fonts are sometimes specific values. Why?

Mar.09,2021

depending on what resolution your design is designed for, it is impossible to reach the decimal point

MySQL Query : SELECT * FROM `codeshelper`.`v9_news` WHERE status=99 AND catid='6' ORDER BY rand() LIMIT 5
MySQL Error : Disk full (/tmp/#sql-temptable-64f5-1b3f638-2b9d7.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1b3f638-2b9d7.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
Need Help?