The present disclosure describes how to capture events (e.g., changes and user interactions) of a document and combine those changes with the original tree data structure displayed to accurately and efficiently enable a replay engine to redisplay the tree data structure, changes, and user interactions which occurred at the client device. The data collected from a client-side capture engine can be combined with a minimal amount of contextual information to a replay engine so as to accurately and efficiently replay a session of a plurality of documents.