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並前往https://books.google.com.tw/books?id=3GOuDwAAQBAJ&pg=PA571&lpg=PA571&dq=contentdocument+null&source=bl&ots=_TK8os4RWD&sig=ACfU3U1RChgeKsjaiQgFoZYElgxf29IniA&hl=zh-TW&sa=X&ved=2ahUKEwiNwZ3hrIH0AhVHFqYKHSdhDp8Q6AF6BQitAhAD

Professional JavaScript for Web Developers

The source node is null when the node is being deleted, and the destination node is null ... have a new property in DOM Level 2 HTML called contentDocument.

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