Cannot enter “::before” for li tag when editing a WordPress page

Why do you need to manually enter it? The ::before and ::after are there even without declaration.

li::before {
    some rules...
}

li::after {
    some rules...
}

Here is an article that describes it.

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Hata!: SQLSTATE[HY000] [1045] Access denied for user 'divattrend_liink'@'localhost' (using password: YES)