This demonstration is meant to confirm that the standard nature of web components permits interoperability, not to say that this particular combination of user interface elements is necessarily beautiful or useful.
One interoperability feature explored here is using Polymer's data binding
against an attribute defined by a non-Polymer element. In this case, the
selected attribute of the paper-tabs component is bound successfully to the
selected-index attribute of the basic-carousel component. This works because
both components support the same convention: when a property backing an
attribute changes, the component raises an event. The event's name is the
attribute's name, plus
Note that this binding works in both directions: clicking on a tab changes the image shown and, in the other direction, using touch/keyboard/trackpad to change the image shown updates the selected tab.