Make all text un-selectable - CSS3 with Javascript fallback

head

<style>
body {
  -webkit-touch-callout: none;
  -webkit-user-select: none;
  -khtml-user-select: none;
  -moz-user-select: none;
  -ms-user-select: none;
  user-select: none;
}
</style>

<script type="text/javascript">
  window.onload = function() {
    var body = document.getElementsByTagName('body');
    disableSelection(body[0]);
  };
  function disableSelection(element) {
      if (typeof element.onselectstart != 'undefined') {
          element.onselectstart = function() { return false; };
      } else if (typeof element.style.MozUserSelect != 'undefined') {
          element.style.MozUserSelect = 'none';
      } else {
          element.onmousedown = function() { return false; };
      }
  }
</script>