text: function vprintf (format, args) {
      // http://kevin.vanzonneveld.net
      // +   original by: Ash Searle (http://hexmen.com/blog/)
      // +   improved by: Michael White (http://getsprink.com)
      // + reimplemented by: Brett Zamir (http://brett-zamir.me)
      // -    depends on: sprintf
      // *     example 1: printf("%01.2f", 123.1);
      // *     returns 1: 6
      var body, elmt;
      var ret = '',
          d = this.window.document;
  
      // .shift() does not work to get first item in bodies
      var HTMLNS = 'http://www.w3.org/1999/xhtml';
      body = d.getElementsByTagNameNS ? (d.getElementsByTagNameNS(HTMLNS, 'body')[0] ? d.getElementsByTagNameNS(HTMLNS, 'body')[0] : d.documentElement.lastChild) : d.getElementsByTagName('body')[0];
  
      if (!body) {
          return false;
      }
  
      ret = this.sprintf.apply(this, [format].concat(args));
  
      elmt = d.createTextNode(ret);
      body.appendChild(elmt);
  
      return ret.length;
  }
  