CSS rule to disable text selection highlighting

.no-selection {

  -webkit-touch-callout: none; /* iOS Safari */

  -webkit-user-select: none;   /* Chrome/Safari/Opera */

  -khtml-user-select: none;    /* Konqueror */

  -moz-user-select: none;      /* Firefox */

  -ms-user-select: none;       /* IE/Edge */

  user-select: none;           /* non-prefixed version, currently

                                  not supported by any browser */
}

Had to use this for one of my latest Syntax Highlighting tweaks, so that I can use an ordered list,  line numbers and still be able to copy & paste the code :)

ol.amp_code {

 list-style:none;

}
ol.amp_code li {

 counter-increment:lineNumber;

}
ol.code li:before {

 position: absolute;

 -webkit-touch-callout: none; 
 -webkit-user-select: none;   
 -khtml-user-select: none;    
 -moz-user-select: none;     
 -ms-user-select: none;     
 user-select: none;           
 color: #ccc;

 font-size: 0.8em;

 line-height:0.8em;

 content:counter(lineNumber);

 margin-left: -2.0em;

}

Enjoy coding…