Step 2 : Adding properties

src/components/hello-world.html

@@ -9,13 +9,22 @@
       }
     </style>
   
-    <h2>Hello Meetup!</h2>
+    <h2>Hello [[name]]!</h2>
 
 </template>
 
   <script>
     class HelloWorldElement extends Polymer.Element {
       static get is() { return 'hello-world' }
+      static get properties() {
+      return {
+        name: {
+          type: String,
+          value: 'Meetup',
+          reflectToAttribute: true
+        },
+      }
+    }
     }
     customElements.define(HelloWorldElement.is, HelloWorldElement);
     </script>