Router with app-route like API, wrapped in an iron-selectable element that binds the active route.
<app-location route="{{route}}"></app-location>
<isw-route-selector route="[[route]]" attr-for-selected="route" selected="{{selectedRoute}}" data="{{data}}">
<isw-route route="a" pattern="/route-a"></isw-route>
<isw-route route="b" pattern="/route-a/route-b"></isw-route>
<isw-route route="c" pattern="/route-c/:somedata"></isw-route>
<isw-route route="d" pattern="/route-c/route-d"></isw-route>
</isw-route-selector>
<iron-pages attr-for-selected="route" selected="[[selectedRoute]]">
<div route="a">Route A</div>
<div route="b">Route B</div>
<div route="c">Route C</div>
<div route="d">Route D</div>
</iron-pages>