Engagement type
Optional
selectionIf the engagementType is "interaction" and this object has a value, you can assume it as a text selection. If the engagementType is "interaction" but this object is not defined, you can assume it as a click
Optional
selectedTotal mouse movement in x and y directions till the engagement triggered. To avoid confusion: this is not the distance between start and end points, this is the total traveled distance.
Total duration in ms till the engagement triggered.