user-select

텍스트 선택 (블록) 을 차단하고 싶다면 user-select 속성을 사용한다.

div {
    -webkit-user-select: none; /* Chrome, Opera, Safari */
    -moz-user-select: none; /* Firefox 2+ */
    -ms-user-select: none; /* IE 10+ */
    user-select: none; /* Standard syntax */
}

auto: Default. Text can be selected if the browser allows it

none: Prevent text selection

text: The text can be selected by the user

all: Text selection is made with one click instead of a double-click