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 ad is viewable according to the viewability definition (e.g. 50% of the ad is visible for at least 2 seconds)
When the viewability of the ad cannot be determined due to technical limitations
When the ad has been clicked