diff --git a/testing/web-platform/tests/shared-storage/resources/verify-shared-storage.https.html b/testing/web-platform/tests/shared-storage/resources/verify-shared-storage.https.html
index 52c79e7e85afc..c2d75ddf85299 100644
--- a/testing/web-platform/tests/shared-storage/resources/verify-shared-storage.https.html
+++ b/testing/web-platform/tests/shared-storage/resources/verify-shared-storage.https.html
@@ -2,12 +2,26 @@
 <html>
 <body>
 <script>
+async function test() {
+  let params = new URL(document.location.toString()).searchParams;
+  let method = params.get("method");
+
   try {
-    window.sharedStorage;
+    if (method == 'set') {
+      await sharedStorage.set('key0', 'key1');
+    } else if (method == 'createWorklet') {
+      await sharedStorage.createWorklet('simple-module.js')
+    } else if (method == 'addModule') {
+      await sharedStorage.worklet.addModule('simple-module.js')
+    }
     window.parent.postMessage({ accessSharedStorageResult: 'success'}, "*");
   } catch (error) {
     window.parent.postMessage({ accessSharedStorageResult: 'failure'}, "*");
   }
+}
+
+test();
+
 </script>
 </body>
 </html>
diff --git a/testing/web-platform/tests/shared-storage/shared-storage-in-sandboxed-iframe.tentative.https.html b/testing/web-platform/tests/shared-storage/shared-storage-in-sandboxed-iframe.tentative.https.html
index 44512706bd633..662d0ff63441b 100644
--- a/testing/web-platform/tests/shared-storage/shared-storage-in-sandboxed-iframe.tentative.https.html
+++ b/testing/web-platform/tests/shared-storage/shared-storage-in-sandboxed-iframe.tentative.https.html
@@ -4,10 +4,11 @@
   <script src=/resources/testharnessreport.js></script>
   <script src=/browsing-topics/resources/header-util.sub.js></script>
   <script>
-    function test_shared_storage_in_sandboxed_iframe(test, sandbox_flags, expect_success) {
+    function test_shared_storage_in_sandboxed_iframe(test, sandbox_flags, method, expect_success) {
       let frame = document.createElement('iframe');
       frame.sandbox = sandbox_flags;
-      frame.src = '/shared-storage/resources/verify-shared-storage.https.html';
+      frame.src = '/shared-storage/resources/verify-shared-storage.https.html' +
+                  `?method=${method}`;
 
       window.addEventListener('message', test.step_func(function handler(evt) {
         if (evt.source === frame.contentWindow) {
@@ -29,13 +30,43 @@
     async_test(t => {
       test_shared_storage_in_sandboxed_iframe(t,
         /*sandbox_flags=*/'allow-scripts allow-same-origin',
+        /*method=*/'set',
         /*expect_success=*/true);
-    }, 'test shared storage in sandboxed iframe with "allow-same-origin"');
+    }, 'test sharedStorage.set() in sandboxed iframe with "allow-same-origin"');
 
     async_test(t => {
       test_shared_storage_in_sandboxed_iframe(t,
         /*sandbox_flags=*/'allow-scripts',
+        /*method=*/'set',
         /*expect_success=*/false);
-    }, 'test shared storage in sandboxed iframe without "allow-same-origin"');
+    }, 'test sharedStorage.set() in sandboxed iframe without "allow-same-origin"');
+
+    async_test(t => {
+      test_shared_storage_in_sandboxed_iframe(t,
+        /*sandbox_flags=*/'allow-scripts allow-same-origin',
+        /*method=*/'createWorklet',
+        /*expect_success=*/true);
+    }, 'test sharedStorage.createWorklet() in sandboxed iframe with "allow-same-origin"');
+
+    async_test(t => {
+      test_shared_storage_in_sandboxed_iframe(t,
+        /*sandbox_flags=*/'allow-scripts',
+        /*method=*/'createWorklet',
+        /*expect_success=*/false);
+    }, 'test sharedStorage.createWorklet() in sandboxed iframe without "allow-same-origin"');
+
+    async_test(t => {
+      test_shared_storage_in_sandboxed_iframe(t,
+        /*sandbox_flags=*/'allow-scripts allow-same-origin',
+        /*method=*/'addModule',
+        /*expect_success=*/true);
+    }, 'test sharedStorage.worklet.addModule() in sandboxed iframe with "allow-same-origin"');
+
+    async_test(t => {
+      test_shared_storage_in_sandboxed_iframe(t,
+        /*sandbox_flags=*/'allow-scripts',
+        /*method=*/'addModule',
+        /*expect_success=*/false);
+    }, 'test sharedStorage.worklet.addModule() in sandboxed iframe without "allow-same-origin"');
   </script>
 </body>
