In some embodiments, a server application can provide a web document to a development application. The web document is dynamically generated from source files. The web document includes element code segments for rendering respective elements of the web document in a browser. Each element code segment includes respective metadata for identifying a respective source file used to generate the element code segment. The server application can receive a breakpoint request from the development application to insert at least one breakpoint in at least one source file identifiable using the metadata in the web document. The server application can insert the breakpoint in the source file responsive to the breakpoint request. The server application can provide an updated web document to the development application. The updated web document includes a subset of the element code segments dynamically generated by executing source code up to the breakpoint in the source file.