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HTML

              
                <div>
<h4>Abre consola del navegador</h4>
<p>Platero es pequeño, peludo, suave; tan blando por fuera, que se diría todo de algodón, que no lleva huesos. Sólo los espejos de azabache de sus ojos son duros cual dos escarabajos de cristal negros.</p>
Lo dejo suelto, y se va al prado, y acaricia tibiamente con su hocico, rozándolas apenas, las florecillas rosas, celestes y gualdas... Lo llamo dulcemente: "¿Platero?", y viene a mí con un trotecillo alegre que parece que se ríe, en no sé qué cascabeleo ideal...</p>
<p>Come cuanto le doy. Le gustan las naranjas, mandarinas, las uvas moscateles, todas de ámbar, los higos morados, con su cristalina gotita de miel...</p>
<div>
    

              
            
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CSS

              
                *{font-family: Verdana, Geneva, sans-serif;}
div{max-width:40em; padding:1em;margin:0 auto;}
              
            
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JS

              
                var sel="";

function seleccion(e) {
    sel = window.getSelection();
    var str = sel.toString();
    if(str.length > 0){
    console.log(sel.toString());}
}
document.addEventListener("mousedown",function(){sel.empty();},false);
document.addEventListener("mouseup",seleccion,false);

              
            
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999px

Console