update elements and fix some bugs

lib/src/paper-tooltip/test/test-button.html

Index: lib/src/paper-tooltip/test/test-button.html
diff --git a/lib/src/paper-tooltip/test/test-button.html b/lib/src/paper-tooltip/test/test-button.html
index ba16303eb550b4b71bb707014aea024fd6021ff1..fa871050bf67b1e8fa6cbdd7504c36808728898a 100644
--- a/lib/src/paper-tooltip/test/test-button.html
+++ b/lib/src/paper-tooltip/test/test-button.html
@@ -23,14 +23,16 @@ subject to an additional IP rights grant found at http://polymer.github.io/PATEN
         height: 20px;
         background-color: red;
       }
+
       paper-tooltip {
         width: 70px;
+        height: 30px;
       }
 
     </style>
 
     <div id="button"></div>
-    <paper-tooltip id="tooltip" for="button">Tooltip text</paper-tooltip>
+    <paper-tooltip id="buttonTooltip" for="button">Tooltip text</paper-tooltip>
   </template>
 
   <script>