Refactored: メソッド名の変更。（Item → Element）
Refactored: メソッド名の変更。（Item → Element）

Implem/Implem.Pleasanter,Implem/Implem.Pleasanter,kingkino/Implem.Pleasanter,Implem/Implem.Pleasanter,kingkino/Implem.Pleasanter