CSS

css disable text select

  -webkit-user-select: none;  /* Chrome all / Safari all */
  -moz-user-select: none;     /* Firefox all */
  -ms-user-select: none;      /* IE 10+ */
  user-select: none;          /* Likely future */ 

disable text selection

#example {
  user-select:none;
}

disable text selection html

<div 
 style="-moz-user-select: none;
        -webkit-user-select: none;
        -ms-user-select:none;
        user-select:none;
        -o-user-select:none;"
     
 unselectable="on"
 onselectstart="return false;" 
 onmousedown="return false;">
    Blabla
</div>

disable text selection html

<div 
 style="-moz-user-select: none; -webkit-user-select: none; -ms-user-select:none; user-select:none;-o-user-select:none;" 
 unselectable="on"
 onselectstart="return false;" 
 onmousedown="return false;">
    Blabla
</div>

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 */
}