The disclosed technology reconstructs stimuli displayed to a user as they interact with online-content. The technology may provide for a record of selected technical parameters and relevant data that may impact the manner in which online content is displayed, taking into consideration the current browser context. The technology may record events as reported from a browser interface. The events may be recorded in a format and syntax to form a primary index of events and related outcomes which comprise the user's interface experience. Events may be detected at the browser interface and identified, categorized, and filtered as to their relevance to visual stimuli. A unique identifier may then be assigned in the form of an alphanumeric string to each relevant event. Selected events may be recorded into a log (along with their categorization), a unique identifier, and the time in which the event occurred.