Why do some css files add @ CHARSET "UTF-8" to the header?

my question is shown in the title.

Why add @ CHARSET "UTF-8" ?

what happens if you don"t add it?

Css
Jun.24,2021

forces browsers to read according to UTF-8.

it's not a big problem if you don't add it. Now it's basically UTF-8, and it's also the default.

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-64f5-1ea3a66-4f142.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1ea3a66-4f142.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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