A user is considered "active" when they perform the following types of user action events:
- mouse events
- keyboard events
- touch events
- navigate (including in a single page app)
If the user is interacting with the page with any of the above user action events, FullStory will classify that part of the session as active.
A range of time within a session is considered inactive if it's been four seconds since the last user action event. The inactive part of the session will show up as yellow in the timeline.