How does shadow dom div implement input in input?

look at the shadow dom
in the input tag and find a div. Why can this div enter content?

Aug.29,2021

that's when div sets the contenteditable attribute

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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-64f5-1eb0752-480bb.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1eb0752-480bb.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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