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https://developer.mozilla.org/ko/docs/Web/API/Document/designMode
Document.designMode - Web API | MDN
document.designMode는 전체 document의 편집 가능 여부를 제어합니다. 유효한 값은
web api mdndocumentdesignmode
https://gofishdigital.com/blog/how-to-use-document-designmode-to-edit-chrome/
How To Use document.DesignMode To Edit Chrome - Go Fish Digital
document designmodego fishuse