If a method or System will allow the username discipline to be still left empty or filled with "none," it suggests the user is not needed to supply a unique identifier. This may be practical in circumstances where by anonymity or lack of private identification is preferred. ブラウザのキャッシュの問題 - キャッシュをクリアするか、別のブラウザに切り替えてみてください。 https://loket168.sbs