function getFastNavGroup(oElement) {
		var oHtmlElement = document.querySelector("html");
		var oFastNavGroup, oCustomFastNavGroup;

		while (oElement && oElement !== oHtmlElement) {
			if (oElement.getAttribute("data-sap-ui-customfastnavgroup") === "true") {
				oCustomFastNavGroup = oElement;
			}
			if (oElement.getAttribute("data-sap-ui-fastnavgroup") === "true") {
				oFastNavGroup = oFastNavGroup || oElement;
			}
			if (oCustomFastNavGroup) {
				break;
			}
			oElement = oElement.assignedSlot || oElement.parentElement || oElement.parentNode.host;
		}

		return oCustomFastNavGroup || oFastNavGroup;
	}
CustomData attribute name for fast navigation groups (in DOM additional prefix "data-" is needed)

@type string
@const
@private
@ui5-restricted sap.ui.core, sap.m, sap.uxap