-page" noscript>
      <template>
        <sidebar-layout>
          <div class="title">second</div>
          <h2>second page</h2>
        </sidebar-layout>
      </template>
    </polymer-element>

    <polymer-element name="third-page" attributes="pageNum" noscript>
      <template>
        <sidebar-layout>
          <div class="title">third</div>
          <h2>{{pageNum}} page</h2>
        </sidebar-layout>
      </template>
    </polymer-element>


    <app-router core-animated-pages transitions="cross