How to monitor change in webpage source code using excel VBA

I have created a excel macro which will do some specific task by navigating through webpage and accessing elements but if webpage source code changes its consume good amount of time to find which element is changed. I just explored in google to locate any standard solution is available to monitor webpage source code change using excel VBA but i cant find any relevant info.

Please guide me with some start up for further analyzing. I am not requesting for the complete VBA script whereas I am looking for an path/procedure to start up.