on-title>Page Three</ion-title>
          </ion-toolbar>
        </ion-header>
        <ion-content class="ion-padding">
          <h1>Page Three</h1>
        </ion-content>
      `;
        }
      }
      customElements.define('page-one', PageOne);
      customElements.define('page-two', PageTwo);
      customElements.define('page-three', PageThree);
    </script>
  </body>
</html>
