When the ad has been completed
When an error has occurred during ad playback
When 25% of the ad has been played
When the impression of ad creative occurs
When the ad has been loaded
When 50% of the ad has been played
When a user action has caused the ad to be muted
When the ad is not viewable according to the viewability definition
When a user action has caused the ad to be paused
When the ad has been playing for a duration equal to the signaled offset
When a user action has caused the ad to be resumed from paused state
When the ad has been skipped
When the ad is started
When 75% of the ad has been played
When a user action has caused the ad to be unmuted
When the viewability of the ad cannot be determined due to technical limitations
When the ad is viewable according to the viewability definition (e.g. 50% of the ad is visible for at least 2 seconds)
When the ad has been clicked