code: function() {
  		var doc = getDocument();
  
  		// create the sheet to be re-used until limit is reached
  		if (!CSSModule.cssCount) {
  			CSSModule.currentStyleSheet = doc.createStyleSheet();
  		}
  
  		CSSModule.cssCount += 1;
  		CSSModule.currentStyleSheet.cssText += this.source;
  
  		// reset the count to force the creation of a new stylesheet
  		if (CSSModule.cssCount === CSSModule.ie9MaxStyleSheets) {
  			CSSModule.cssCount = 0;
  		}
  	}
docs: Inject stylesheets and re-used them to avoid IE9 limit
  https://blogs.msdn.microsoft.com/ieinternals/2011/05/14/stylesheet-limits-in-internet-explorer/