You're in fact wrong, the chance that users will have exactly the same version of jQuery cached is pretty small. [1] If you want to read more about jQuery on cd

You're in fact wrong, the chance that users will have exactly the same version of jQuery cached is pretty small. [1] If you want to read more about jQuery on cdns, there is a long discussion on html5boilerplate github page. [2] [1] http://statichtml.com/2011/google-ajax-libraries-caching.html http://statichtml.com/2011/google-ajax-libraries-caching.htm... [2] https://github.com/h5bp/html5-boilerplate/pull/1327 https://github.com/h5bp/html5-boilerplate/pull/1327