code: function(jStepArea){
  		if (sap.ui.getCore().getConfiguration().getRTL() && Device.browser.webkit) {
  			return ( -1) * (jStepArea.get(0).scrollWidth - jStepArea.scrollLeft() - jStepArea.width());
  		}
  		return jStepArea.scrollLeft();
  	}
docs: Calculates the scroll left attribute (with fix for Safari in RTL mode) to make the position and scroll calculations running (see comment on getRTLFactor for RTL behavior)