pub fn generate_cache_listener_for_element<T: ImageCacheListener + DerivedFrom<Node> + DomObject>(
elem: &T
) -> IpcSender<PendingImageResponse>pub fn generate_cache_listener_for_element<T: ImageCacheListener + DerivedFrom<Node> + DomObject>(
elem: &T
) -> IpcSender<PendingImageResponse>