In today's online oriented environment, localization of dynamic faults has become a major role in web application development. This paper describes the novel framework named as pin down, an automated root cause analysis of dynamically generated web pages. Execution fault localization in dynamic web application is a prominent problem of finding root location that causes failure in which source code changes need to be made in order to fix predicted faults. Execution faults are web application error that causes incorrect functionality to the dynamic web application that also called as execution bugs. The dynamic execution nature of the web application separates the source cause of an execution bug by various fault localization techniques.