This is a plugin for Marionette, an execellent JavaScript framework.
A FragmentView is a replacement for the standard CollectionView provide by Marionette. It internally uses a Document Fragment to handle rendering its collection of ItemViews. This should lead to some performance gains.
A CollectionView is given a collection and it will listen for add events. When an add event happens, the CollectionView will
build an ItemView for the added model and immediatly render it to the CollectionView.$el.
A FragmentView is also given a collection, and it also listens for add events. However, when the event happens a ItemView is created
and appended to an internal managed Document Fragment. The created ItemView is not immediatly rendered. The DOM is not touched when an add event is fired.
Instead, the FragmentView waits for render() to be called on it, or for the ready event to be fired on the collection. At that point, the Document Fragment
is added to the DOM.