diff --git a/tests/wpt/mozilla/meta/MANIFEST.json b/tests/wpt/mozilla/meta/MANIFEST.json
index 155f9a504d4..9af1b5e0218 100644
--- a/tests/wpt/mozilla/meta/MANIFEST.json
+++ b/tests/wpt/mozilla/meta/MANIFEST.json
@@ -26534,7 +26534,7 @@
    "testharness"
   ],
   "mozilla/collections.html": [
-   "f1029d519aa7017a1a3d18a891a0774b9a39f847",
+   "aa060d1e5d1364224f2c2151e5f8b9580ac4427e",
    "testharness"
   ],
   "mozilla/createEvent-storageevent.html": [
@@ -27534,7 +27534,7 @@
    "testharness"
   ],
   "mozilla/prototypes.html": [
-   "bb4824ae242ed89485a272f6ef74631d6fea62be",
+   "e19d75682a83f4d2de1cbdf053aadfda181d6725",
    "testharness"
   ],
   "mozilla/proxy_setter.html": [
diff --git a/tests/wpt/mozilla/tests/mozilla/collections.html b/tests/wpt/mozilla/tests/mozilla/collections.html
index 2f33466cfa8..d10ec90360d 100644
--- a/tests/wpt/mozilla/tests/mozilla/collections.html
+++ b/tests/wpt/mozilla/tests/mozilla/collections.html
@@ -63,7 +63,7 @@
   <track></track>
 </video>
 
-<foo-á>hi</foo-á>
+<fooá>hi</fooá>
 
 <script>
 test(function() {
@@ -142,7 +142,7 @@ test(function() {
 
   // Test non-ASCII tag names.  Uppercasing is ASCII-only per spec:
   // http://dom.spec.whatwg.org/#dom-element-tagname
-  check_tag("foo-á", 1, [HTMLUnknownElement], "FOO-á");
+  check_tag("fooá", 1, [HTMLUnknownElement], "FOOá");
 });
 </script>
 </body>
diff --git a/tests/wpt/mozilla/tests/mozilla/prototypes.html b/tests/wpt/mozilla/tests/mozilla/prototypes.html
index b509b46192e..478b89a6fb8 100644
--- a/tests/wpt/mozilla/tests/mozilla/prototypes.html
+++ b/tests/wpt/mozilla/tests/mozilla/prototypes.html
@@ -5,7 +5,7 @@
   <script src="/resources/testharnessreport.js"></script>
 </head>
 <body>
-  <foo-á>foo</foo-á>
+  <fooá>foo</fooá>
 <script>
 test(function() {
   assert_true(window.document instanceof Node, "Should be Node");
@@ -18,8 +18,8 @@ test(function() {
   assert_true(window.document.documentElement instanceof HTMLHtmlElement, "Should be HTMLHtmlElement");
   assert_true(window.document instanceof Document, "Should be Document");
   assert_equals(window.document.documentElement.tagName, "HTML");
-  assert_true(window.document.getElementsByTagName('foo-á')[0] instanceof HTMLUnknownElement, "Should be HTMLUnknownElement");
-  assert_equals(window.document.getElementsByTagName('foo-á')[0].tagName, "FOO-á");
+  assert_true(window.document.getElementsByTagName('fooá')[0] instanceof HTMLUnknownElement, "Should be HTMLUnknownElement");
+  assert_equals(window.document.getElementsByTagName('fooá')[0].tagName, "FOOá");
 });
 </script>
 </body>
