document: Dynamic and graphical web page breakpoints Breakpoints are perhaps the quintessential feature of a de-bugger : they allow a developer to stop time and study the program state . Breakpoints are typically specified by selecting a line of source code . For large , complex , web pages with multiple developers , the relevant source line for a given user interface problem may not be known to the developer . In this paper we describe the implementation of breakpoints in dynamically created source , and on error messages , network events , DOMmutation , DOMobject property changes , and CSS style rule updates . Adding these domain-specific breakpoints to a general-purpose debugger for Javascript allows the developer to initiate the debugging process via Web page abstractions rather than lower level source code views . The breakpoints are implemented in the open source Fire-bug project , version 1.5 , for the Firefox Web browser .
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