 heightContent;

      content.style.zoom = Math.min(xScale, yScale);
    }

    /**
     * Fragment
     */
    function Fragment(element){
      var indexEnter = element.getAttribute('data-enter');
      var indexExit = element.getAttribute('data-exit');
      
      this.enter = indexEnter ? parseInt(indexEnter, 10) : undefined;
      this.exit = indexExit ? parseInt(indexExit, 10) : undefined;
      this.elem = element;
      
      if(!this.exit || this.enter < this.exit) {
        this.hide();
      }