Why is visualviewport equal to idealviewport/initial-scale?

visualviewport = idealviewport/initial-scale

look at the mobile adaptation and see this formula, but visualviewport refers to the width of the browser"s visual area. What about this?

Apr.22,2022

initial-scale equals vistual viewport and layout viewport at initialization

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-64f5-1b3e1e2-4f050.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1b3e1e2-4f050.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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