code: function (pluginName, moduleName, write) {
  
  			var module,
  				content,
  				cutPos,
  				modPath,
  				relCssPath;
  			if (_genericCssToRootPath && _buildMap.hasOwnProperty(moduleName)) {
  
  				module = _buildMap[moduleName];
  				if (module.write) {
  
  					// #1: fix urls in css
  					// get folder path to the current module
  					cutPos = moduleName.lastIndexOf("/");
  					modPath = cutPos >= 0 ? moduleName.slice(0, cutPos + 1) : "";
  					// form a new base path for substituting in css
  					relCssPath = _genericCssToRootPath + modPath;
  
  					// replace all links like 'url(folder/file.png)' in the module's content (css)
  					// to make them relative to the generic.css location
  					content = _replaceCssRelativeUrls(module.data, relCssPath);
  
  					// #2: add module's css into common generic.css
  					module.write(moduleName, module.path, content);
  				}
  			}
  		}
docs: >>excludeStart("exclude", pragmas.optimizeSave); 
  Executed by r.js optimizer during build stage