function getPreserveArea() {
		var $preserve = jQuery(document.getElementById(ID_PRESERVE_AREA));
		if ($preserve.length === 0) {
			$preserve = jQuery("<div></div>",{"aria-hidden":"true",id:ID_PRESERVE_AREA}).
				addClass("sapUiHidden").addClass("sapUiForcedHidden").css("width", "0").css("height", "0").css("overflow", "hidden").
				appendTo(document.body);
		}
		return $preserve;
	}
Creates the ID to be used for the invisible Placeholder DOM element.
This method can be used to get direct access to the placeholder DOM element.
Also statically available as RenderManager.createInvisiblePlaceholderId()

@param {sap.ui.core.Element} oElement - The Element instance for which to create the placeholder ID
@returns {string} The ID used for the invisible Placeholder of this element
@static
@protected