function writeStyles() {
			var oStyle = aStyleStack[aStyleStack.length - 1];
			if (oStyle.aStyle && oStyle.aStyle.length) {
				// Due to possible CSP restrictions we do not write styles into the HTML buffer. Instead, we store the styles in the aRenderingStyles array
				// and add a ATTR_STYLE_KEY_MARKER attribute marker for which the value references the original style index in the aRenderingStyles array.
				writeAttribute(ATTR_STYLE_KEY_MARKER, aRenderingStyles.push(oStyle.aStyle.join(" ")) - 1);
			}
			oStyle.aStyle = null;
		}
Used by the string rendering APIs to write out the collected styles during writeStyles/openEnd/voidEnd
@param {sap.ui.core.RenderManager} oRm The <code>RenderManager</code> instance
@private