Abstract: An appearance manager for editing and previewing a portion of a Web page, such as a header and/or a footer. A browser-based appearance manager user interface enables a user to edit, validate, and store source markup code of the portion of the Web page without affecting a corresponding deployed Web page. The appearance manager can render the portion of the Web page separate from the remainder of the corresponding deployed Web page or together with the remainder of the corresponding deployed Web page. In either case, the rendering is done separate from the corresponding deployed Web page, so as not to affect the deployed Web page, which is accessible to client browsers. When rendering together, the appearance manager accesses and applies the same stylesheet that is applied to the corresponding deployed Web page. Thus, the user can preview revised portions of the Web page as they will appear when deployed.