Guide Step-by-step show best practices to improve Web site with Ajax A step by step guide to increase Web site with Ajax. Using a progressive improvement techniques to ensure graceful degradation (which makes sites usable in all browsers). Shows readers how to write their own Ajax scripts instead of relying on third-party libraries. In Bulletproof Ajax author Jeremy Keith demonstrates how developers comfortable with CSS and (X) HTML can build Ajax functionality without frameworks, using the ideas of graceful degradation and progressive improvement to ensure that the pages work for all users.