code: function (css, name) {
  				if (typeof css === "function") { css = css(); }
  				if (!css) { return; }
  				if (!name) {
  					_includeCSSInternal(css);
  				} else if (!_stylesheetFiles[name]) {
  					_includeCSSInternal(css);
  					_stylesheetFiles[name] = true;
  				}
  			}
docs: Append style element with css param's content
  @param {String|Function} css Content for style element or a function which returns it
  @param {String} name Name of the stylesheet to prevent duplication.