Why doesn't the parent element collapse when the parent element sets the border, parent-child element margin?

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margin-top

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border

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margin-toppadding-topmargin-top

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Mar.09,2021
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-64f5-1eb0faa-480ef.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1eb0faa-480ef.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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