Add testcases.

src/test/html/test_bindings.html

@@ -15,7 +15,12 @@
     <a href="http://www.mozilla.org"></a>
     <img src="test.jpg"/>
     <embed></embed>
-    <form></form>
+    <form>
+      <fieldset>
+        <legend>legend</legend>
+        <label for="">label<input type="text" value="input" /></label>
+      </fieldset>
+    </form>
     <hr />
     <canvas/>
     <p>pppppppppp</p>
@@ -50,5 +55,10 @@
     </audio>
     <area></area>
     <data></data>
+    <template></template>
+    <pre>pre</pre>
+    <video src="">
+      <track></track>
+    </video>
   </body>
 </html>

src/test/html/test_bindings.js

@@ -241,6 +241,57 @@ window.alert(tags.length);
 window.alert(tags[0].tagName);
 window.alert(tags[0] instanceof HTMLProgressElement);
 
+window.alert("HTMLTemplateElement:");
+let tags = document.getElementsByTagName("template");
+window.alert(tags);
+window.alert(tags.length);
+window.alert(tags[0].tagName);
+window.alert(tags[0] instanceof HTMLTemplateElement);
+
+window.alert("HTMLPreElement:");
+let tags = document.getElementsByTagName("pre");
+window.alert(tags);
+window.alert(tags.length);
+window.alert(tags[0].tagName);
+window.alert(tags[0] instanceof HTMLPreElement);
+
+window.alert("HTMLLegendElement:");
+let tags = document.getElementsByTagName("legend");
+window.alert(tags);
+window.alert(tags.length);
+window.alert(tags[0].tagName);
+window.alert(tags[0] instanceof HTMLLegendElement);
+
+window.alert("HTMLLabelElement:");
+let tags = document.getElementsByTagName("label");
+window.alert(tags);
+window.alert(tags.length);
+window.alert(tags[0].tagName);
+window.alert(tags[0] instanceof HTMLLabelElement);
+
+window.alert("HTMLTrackElement:");
+let tags = document.getElementsByTagName("track");
+window.alert(tags);
+window.alert(tags.length);
+window.alert(tags[0].tagName);
+window.alert(tags[0] instanceof HTMLTrackElement);
+
+window.alert("HTMLAudioElement:");
+let tags = document.getElementsByTagName("audio");
+window.alert(tags);
+window.alert(tags.length);
+window.alert(tags[0].tagName);
+window.alert(tags[0] instanceof HTMLMediaElement);
+window.alert(tags[0] instanceof HTMLAudioElement);
+
+window.alert("HTMLVideoElement:");
+let tags = document.getElementsByTagName("video");
+window.alert(tags);
+window.alert(tags.length);
+window.alert(tags[0].tagName);
+window.alert(tags[0] instanceof HTMLMediaElement);
+window.alert(tags[0] instanceof HTMLVideoElement);
+
 //TODO: Doesn't work until we throw proper exceptions instead of returning 0 on
 //      unwrap failure.
 /*try {