A Boolean value that indicates whether the player view can begin trimming.
- macOS 10.9+
begin, check the value of this property to determine whether the player view and current media support trimming. This property returns
false if trimming isn’t supported by the current
controls selection, the media is content protected, or the media is served using HTTP Live Streaming.
If you’re presenting a menu item to initiate trimming, a good place to perform this check is in the
validate method of