The proportion in the mobile meta tag is reduced, why is the dpr also reduced?

Xiaobai doesn"t quite understand the principle. In solving the one-pixel problem, why does the minimum and maximum in the meta tag shrink and the dpr shrink? Is there any connection between them?

Mar.11,2021
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-64f5-1e52809-4c8c2.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1e52809-4c8c2.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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