How can I take a snapshot of a wep page's DOM structure?

[litejems94]

I need to compare a webpage's DOM structure at various points in point. What are the ways to retrieve and snapshot it.I need the DOM on server-side for processing.I basically need to track structural changes to a webpage. Such as removing of a div tag, or inserting a p tag. Changing data (innerHTML) on those tags should not be seen as a difference.