code: function () {
              var el = this.element();
              if ( el === document || el === window ) {
                  return $B.measure.windowWidth();
              } else if ( el === screen ) {
                  return screen.availWidth;
              } else {
                  var pl, pr, value = this.width();
      
                  pl = parseFloat( this.css('padding-left') );
                  pr = parseFloat( this.css('padding-right') );
                  return value - (( pl > 0 ? pl : 0 ) + ( pr > 0 ? pr : 0 ));
              }
          }
docs: <b>읽기전용</b>
  타겟타입:(Selector, Element)
  Border, 스크롤바, Padding이 제외된 가로사이즈 반환, screen 지원
  @return	{Number}