diff --git a/tests/wpt/mozilla/meta/MANIFEST.json b/tests/wpt/mozilla/meta/MANIFEST.json
index 2882e223c64..3e7f2673696 100644
--- a/tests/wpt/mozilla/meta/MANIFEST.json
+++ b/tests/wpt/mozilla/meta/MANIFEST.json
@@ -70959,7 +70959,7 @@
    "support"
   ],
   "mozilla/worklets/test_paint_worklet.html": [
-   "67fccbde17c28e13b5f4dc54d70b1279d6e9d602",
+   "582287f9808afef465529e9fd80deadf10715868",
    "reftest"
   ],
   "mozilla/worklets/test_paint_worklet.js": [
@@ -70979,7 +70979,7 @@
    "support"
   ],
   "mozilla/worklets/test_paint_worklet_loading.html": [
-   "20fef90b09fdf8dfb5e7461a01c8bd0f7e5d31af",
+   "753dee7a328c99a42f4e6e46719a02fb9e179a09",
    "testharness"
   ],
   "mozilla/worklets/test_paint_worklet_no_paint.js": [
@@ -71003,7 +71003,7 @@
    "support"
   ],
   "mozilla/worklets/test_paint_worklet_size.html": [
-   "6ddcf8ad81eaf4a5112de39a87cbd3d290fd9ab4",
+   "eba8c08b2b1fe1992772c01a1b85e709fa580bbc",
    "reftest"
   ],
   "mozilla/worklets/test_paint_worklet_size.js": [
@@ -71015,7 +71015,7 @@
    "support"
   ],
   "mozilla/worklets/test_paint_worklet_timeout.html": [
-   "dde3d2d6359d39282cf8dfdfabebed735c7815a8",
+   "9ff9ce5392fd214f2939b26ede875ec74c4abfdd",
    "reftest"
   ],
   "mozilla/worklets/test_paint_worklet_timeout.js": [
diff --git a/tests/wpt/mozilla/tests/mozilla/worklets/test_paint_worklet.html b/tests/wpt/mozilla/tests/mozilla/worklets/test_paint_worklet.html
index 1dfe906a0e2..595851063ce 100644
--- a/tests/wpt/mozilla/tests/mozilla/worklets/test_paint_worklet.html
+++ b/tests/wpt/mozilla/tests/mozilla/worklets/test_paint_worklet.html
@@ -11,7 +11,7 @@
     <script>
         // This reftest will TIMEOUT if loading the paint worklet fails,
         // It will PASS if the worklet draws a green rectangle.
-        window.paintWorklet
+        CSS.paintWorklet
             .addModule("test_paint_worklet.js")
             .then(function() { document.documentElement.classList.remove("reftest-wait"); });
     </script>
diff --git a/tests/wpt/mozilla/tests/mozilla/worklets/test_paint_worklet_loading.html b/tests/wpt/mozilla/tests/mozilla/worklets/test_paint_worklet_loading.html
index e1edce96d12..009a2affe99 100644
--- a/tests/wpt/mozilla/tests/mozilla/worklets/test_paint_worklet_loading.html
+++ b/tests/wpt/mozilla/tests/mozilla/worklets/test_paint_worklet_loading.html
@@ -8,56 +8,56 @@
 var host_info = get_host_info();
 
 promise_test(function() {
-  return paintWorklet.addModule("test_paint_worklet.js");
+  return CSS.paintWorklet.addModule("test_paint_worklet.js");
 }, "Loading a paint worklet.");
 
 promise_test(function(t) {
    var path = new URL("test_paint_worklet.js", document.location).pathname;
    var url = new URL(path, host_info.HTTP_REMOTE_ORIGIN);
-   return promise_rejects(t, "AbortError", paintWorklet.addModule(url));
+   return promise_rejects(t, "AbortError", CSS.paintWorklet.addModule(url));
 }, "Loading a cross-origin paint worklet.");
 
 promise_test(function(t) {
-   return promise_rejects(t, "AbortError", paintWorklet.addModule("nonexistent_worklet.js"));
+   return promise_rejects(t, "AbortError", CSS.paintWorklet.addModule("nonexistent_worklet.js"));
 }, "Loading a nonexistent paint worklet.");
 
 promise_test(function(t) {
-   return promise_rejects(t, "AbortError", paintWorklet.addModule("syntax_error.js"));
+   return promise_rejects(t, "AbortError", CSS.paintWorklet.addModule("syntax_error.js"));
 }, "Loading a syntactically incorrect paint worklet.");
 
 promise_test(function(t) {
-   return promise_rejects(t, "AbortError", paintWorklet.addModule("throw_exception.js"));
+   return promise_rejects(t, "AbortError", CSS.paintWorklet.addModule("throw_exception.js"));
 }, "Loading an exception-throwing paint worklet.");
 
 promise_test(function(t) {
-   return promise_rejects(t, "AbortError", paintWorklet.addModule("test_paint_worklet.js"));
+   return promise_rejects(t, "AbortError", CSS.paintWorklet.addModule("test_paint_worklet.js"));
 }, "Loading a paint worklet again.");
 
 promise_test(function(t) {
-   return promise_rejects(t, "AbortError", paintWorklet.addModule("test_paint_worklet_empty_name.js"));
+   return promise_rejects(t, "AbortError", CSS.paintWorklet.addModule("test_paint_worklet_empty_name.js"));
 }, "Loading a paint worklet with an empty name.");
 
 promise_test(function(t) {
-   return promise_rejects(t, "AbortError", paintWorklet.addModule("test_paint_worklet_properties_throws.js"));
+   return promise_rejects(t, "AbortError", CSS.paintWorklet.addModule("test_paint_worklet_properties_throws.js"));
 }, "Loading a paint worklet whose inputProperties throws an exception.");
 
 promise_test(function(t) {
-   return promise_rejects(t, "AbortError", paintWorklet.addModule("test_paint_worklet_arguments_throws.js"));
+   return promise_rejects(t, "AbortError", CSS.paintWorklet.addModule("test_paint_worklet_arguments_throws.js"));
 }, "Loading a paint worklet whose inputArguments throws an exception.");
 
 promise_test(function(t) {
-   return promise_rejects(t, "AbortError", paintWorklet.addModule("test_paint_worklet_alpha_throws.js"));
+   return promise_rejects(t, "AbortError", CSS.paintWorklet.addModule("test_paint_worklet_alpha_throws.js"));
 }, "Loading a paint worklet whose alpha throws an exception.");
 
 promise_test(function(t) {
-   return promise_rejects(t, "AbortError", paintWorklet.addModule("test_paint_worklet_not_constructor.js"));
+   return promise_rejects(t, "AbortError", CSS.paintWorklet.addModule("test_paint_worklet_not_constructor.js"));
 }, "Loading a paint worklet which isn't a constructor function.");
 
 promise_test(function(t) {
-   return promise_rejects(t, "AbortError", paintWorklet.addModule("test_paint_worklet_no_paint.js"));
+   return promise_rejects(t, "AbortError", CSS.paintWorklet.addModule("test_paint_worklet_no_paint.js"));
 }, "Loading a paint worklet with no paint.");
 
 promise_test(function(t) {
-   return promise_rejects(t, "AbortError", paintWorklet.addModule("test_paint_worklet_paint_not_callable.js"));
+   return promise_rejects(t, "AbortError", CSS.paintWorklet.addModule("test_paint_worklet_paint_not_callable.js"));
 }, "Loading a paint worklet with a paint that is not callable.");
 </script>
diff --git a/tests/wpt/mozilla/tests/mozilla/worklets/test_paint_worklet_size.html b/tests/wpt/mozilla/tests/mozilla/worklets/test_paint_worklet_size.html
index 01328b073c3..f3cc376768d 100644
--- a/tests/wpt/mozilla/tests/mozilla/worklets/test_paint_worklet_size.html
+++ b/tests/wpt/mozilla/tests/mozilla/worklets/test_paint_worklet_size.html
@@ -10,7 +10,7 @@
                     margin: 10px; border: 3px solid blue; padding: 5px;"></div>
     </body>
     <script>
-        window.paintWorklet
+        CSS.paintWorklet
             .addModule("test_paint_worklet_size.js")
             .then(function() { document.documentElement.classList.remove("reftest-wait"); });
     </script>
diff --git a/tests/wpt/mozilla/tests/mozilla/worklets/test_paint_worklet_timeout.html b/tests/wpt/mozilla/tests/mozilla/worklets/test_paint_worklet_timeout.html
index fd4625b8874..73d7dbe69a4 100644
--- a/tests/wpt/mozilla/tests/mozilla/worklets/test_paint_worklet_timeout.html
+++ b/tests/wpt/mozilla/tests/mozilla/worklets/test_paint_worklet_timeout.html
@@ -21,7 +21,7 @@
     </style>
 
     <script>
-      window.paintWorklet.addModule('test_paint_worklet_timeout.js')
+      CSS.paintWorklet.addModule('test_paint_worklet_timeout.js')
             .then(() => document.documentElement.classList.remove('reftest-wait'));
     </script>