diff --git a/tests/wpt/metadata/html/semantics/interfaces.html.ini b/tests/wpt/metadata/html/semantics/interfaces.html.ini
index 555a1b7d1fc..61048ef3c0e 100644
--- a/tests/wpt/metadata/html/semantics/interfaces.html.ini
+++ b/tests/wpt/metadata/html/semantics/interfaces.html.ini
@@ -45,3 +45,48 @@
   [Interfaces for command]
     expected: FAIL
 
+  [Interfaces for BGSOUND]
+    expected: FAIL
+
+  [Interfaces for BLOCKQUOTE]
+    expected: FAIL
+
+  [Interfaces for ISINDEX]
+    expected: FAIL
+
+  [Interfaces for KEYGEN]
+    expected: FAIL
+
+  [Interfaces for LISTING]
+    expected: FAIL
+
+  [Interfaces for MARQUEE]
+    expected: FAIL
+
+  [Interfaces for MENU]
+    expected: FAIL
+
+  [Interfaces for NOEMBED]
+    expected: FAIL
+
+  [Interfaces for PLAINTEXT]
+    expected: FAIL
+
+  [Interfaces for SPACER]
+    expected: FAIL
+
+  [Interfaces for TFOOT]
+    expected: FAIL
+
+  [Interfaces for THEAD]
+    expected: FAIL
+
+  [Interfaces for XMP]
+    expected: FAIL
+
+  [Interfaces for DETAILS]
+    expected: FAIL
+
+  [Interfaces for COMMAND]
+    expected: FAIL
+
diff --git a/tests/wpt/mozilla/meta/MANIFEST.json b/tests/wpt/mozilla/meta/MANIFEST.json
index f4626826e51..110dd12da11 100644
--- a/tests/wpt/mozilla/meta/MANIFEST.json
+++ b/tests/wpt/mozilla/meta/MANIFEST.json
@@ -83,12 +83,6 @@
             "url": "/_mozilla/mozilla/collections.html"
           }
         ],
-        "mozilla/create_element.html": [
-          {
-            "path": "mozilla/create_element.html",
-            "url": "/_mozilla/mozilla/create_element.html"
-          }
-        ],
         "mozilla/documentElement.html": [
           {
             "path": "mozilla/documentElement.html",
diff --git a/tests/wpt/mozilla/tests/mozilla/create_element.html b/tests/wpt/mozilla/tests/mozilla/create_element.html
deleted file mode 100644
index 0ceeae5de98..00000000000
--- a/tests/wpt/mozilla/tests/mozilla/create_element.html
+++ /dev/null
@@ -1,21 +0,0 @@
-<html>
-<head>
-  <title></title>
-  <script src="/resources/testharness.js"></script>
-  <script src="/resources/testharnessreport.js"></script>
-</head>
-<body>
-  <script>
-  test(function() {
-    var elem = document.createElement("foo");
-    assert_equals(elem.tagName, "FOO");
-    var elem = document.createElement("p");
-    assert_true(elem instanceof HTMLParagraphElement, "Should be HTMLParagraphElement");
-    var elem = document.createElement("sPAn");
-    assert_true(elem instanceof HTMLSpanElement, "Should be HTMLSpanElement");
-    var text = document.createTextNode("hello");
-    assert_true(text instanceof Text, "Should be Text");
-  });
-  </script>
-</body>
-</html>
diff --git a/tests/wpt/web-platform-tests/html/semantics/interfaces.html b/tests/wpt/web-platform-tests/html/semantics/interfaces.html
index 4d943298c1f..c08fea82e52 100644
--- a/tests/wpt/web-platform-tests/html/semantics/interfaces.html
+++ b/tests/wpt/web-platform-tests/html/semantics/interfaces.html
@@ -28,5 +28,6 @@ function do_test(local_name, iface) {
 
 elements.forEach(function(a) {
   do_test(a[0], a[1]);
+  do_test(a[0].toUpperCase(), a[1]);
 })
 </script>
diff --git a/tests/wpt/web-platform-tests/html/semantics/interfaces.js b/tests/wpt/web-platform-tests/html/semantics/interfaces.js
index 5f5d2d908fa..3609e36bf48 100644
--- a/tests/wpt/web-platform-tests/html/semantics/interfaces.js
+++ b/tests/wpt/web-platform-tests/html/semantics/interfaces.js
@@ -134,5 +134,6 @@ var elements = [
   ["dialog", "Dialog"],
   ["figcaption", ""],
   ["summary", ""],
-  ["track", "Track"]
+  ["track", "Track"],
+  ["foo", "Unknown"]
 ];
