CSS

disable text selection

#example {
  user-select:none;
}

Disable text selection/highlight

.disable-select {
    user-select: none; /* supported by Chrome and Opera */
   -webkit-user-select: none; /* Safari */
   -khtml-user-select: none; /* Konqueror HTML */
   -moz-user-select: none; /* Firefox */
   -ms-user-select: none; /* Internet Explorer/Edge */
}