div#special {

  height: 20px;

  width: 100px;

  background-color: red;

}

​

div#special:before {

  position: absolute;

  content: 'click me!';

  color: white;

}

​

div#special:focus:before {

  display: none;

}

​

div#special:focus {

  background-color: transparent;

}

​

div#special > div {

  display: none;

}

​

div#special:focus > div {

   display: block;

}