In order to make sure all users get a smooth experience, browsers don't allow websites to use the [fullscreen Browser API](🔗) in case the action of using it has not been triggered by a [user gesture](🔗). Therefore, it is not possible to use the `enterFullscreen()` Bitmovin Player API call within a player event handler, as its call stack requires a user gesture (e.g. a click) to be present.