Components

In Version 3.2, Knockout added components using the combination of a template (view) with a viewmodel to create reusable, behavior-driven DOM objects. Knockout components are inspired by web components, a new (and experimental, at the time of writing this) set of standards that allow developers to define custom HTML elements paired with JavaScript that create packed controls. Like web components, Knockout allows the developer to use custom HTML tags to represent these components in the DOM. Knockout also allows components to be instantiated with a binding handler on standard HTML elements. Knockout binds components by injecting an HTML template, which is bound to its own viewmodel.

This is probably the single largest feature Knockout has ever added to the core library. The reason we started with RequireJS is that components can optionally be loaded and defined with module loaders, including their HTML templates! This means that our entire application (even the HTML) can be defined...