CSS text within the prohibited area, double-click the selected

Add the following style to the div, then all child elements in the div, it will not be selected.

Reference:  https://www.cnblogs.com/wyhlightstar/p/6542295.html

.div { 
    -moz-User-SELECT : none ; / * Firefox * / 
    -webkit-User-SELECT : none ; / * WebKit browser * / 
    -ms-User-SELECT : none ; / * the IE10 * / 
    -khtml- SELECT-User : none ; / * old browser * / 
      User-SELECT : none ;
}