diff --git a/shared-storage/cross-origin-create-worklet-credentials-include.tentative.https.sub.html b/shared-storage/cross-origin-create-worklet-credentials-include.tentative.https.sub.html
new file mode 100644
index 000000000000000..9c44d2a29f8d332
--- /dev/null
+++ b/shared-storage/cross-origin-create-worklet-credentials-include.tentative.https.sub.html
@@ -0,0 +1,39 @@
+<!doctype html>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/common/utils.js"></script>
+<script src="/shared-storage/resources/util.js"></script>
+<script src="/fenced-frame/resources/utils.js"></script>
+
+<body>
+<script>
+'use strict';
+
+promise_test(async () => {
+  const ancestor_key = token();
+  const crossOrigin = 'https://{{domains[www]}}:{{ports[https][0]}}';
+  const set_cookie_url = crossOrigin + `/cookies/resources/set-cookie.py` +
+                         `?name=key0` +
+                         `&path=/shared-storage/`;
+  const helper_url = crossOrigin +
+                     `/shared-storage/resources/credentials-test-helper.py` +
+                     `?access_control_allow_origin_header=${window.origin}` +
+                     `&access_control_allow_credentials_header=true` +
+                     `&token=${ancestor_key}`;
+
+  await fetch(set_cookie_url, { mode: 'no-cors', credentials: 'include' });
+
+  const worklet = await sharedStorage.createWorklet(
+    helper_url + `&action=store-cookie`,
+    { credentials: "include" });
+
+  const request_cookie_fetch_response =
+    await fetch(helper_url + `&action=get-cookie`);
+
+  const request_cookie_text = await request_cookie_fetch_response.text();
+
+  assert_equals(request_cookie_text, "key0=1");
+}, 'createWorklet() with cross-origin module script and credentials "include"');
+
+</script>
+</body>
diff --git a/shared-storage/cross-origin-create-worklet-credentials-omit.tentative.https.sub.html b/shared-storage/cross-origin-create-worklet-credentials-omit.tentative.https.sub.html
new file mode 100644
index 000000000000000..ddda1809f2ca959
--- /dev/null
+++ b/shared-storage/cross-origin-create-worklet-credentials-omit.tentative.https.sub.html
@@ -0,0 +1,38 @@
+<!doctype html>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/common/utils.js"></script>
+<script src="/shared-storage/resources/util.js"></script>
+<script src="/fenced-frame/resources/utils.js"></script>
+
+<body>
+<script>
+'use strict';
+
+promise_test(async () => {
+  const ancestor_key = token();
+  const crossOrigin = 'https://{{domains[www]}}:{{ports[https][0]}}';
+  const set_cookie_url = crossOrigin + `/cookies/resources/set-cookie.py` +
+                         `?name=key0` +
+                         `&path=/shared-storage/`;
+  const helper_url = crossOrigin +
+                     `/shared-storage/resources/credentials-test-helper.py` +
+                     `?access_control_allow_origin_header=${window.origin}` +
+                     `&token=${ancestor_key}`;
+
+  await fetch(set_cookie_url, { mode: 'no-cors', credentials: 'include' });
+
+  const worklet = await sharedStorage.createWorklet(
+    helper_url + `&action=store-cookie`,
+    { credentials: "omit" });
+
+  const request_cookie_fetch_response =
+    await fetch(helper_url + `&action=get-cookie`);
+
+  const request_cookie_text = await request_cookie_fetch_response.text();
+
+  assert_equals(request_cookie_text, "NO_COOKIE_HEADER");
+}, 'createWorklet() with cross-origin module script and credentials "omit"');
+
+</script>
+</body>
diff --git a/shared-storage/cross-origin-create-worklet-credentials-same-origin.tentative.https.sub.html b/shared-storage/cross-origin-create-worklet-credentials-same-origin.tentative.https.sub.html
new file mode 100644
index 000000000000000..99701d2b7d40a12
--- /dev/null
+++ b/shared-storage/cross-origin-create-worklet-credentials-same-origin.tentative.https.sub.html
@@ -0,0 +1,38 @@
+<!doctype html>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/common/utils.js"></script>
+<script src="/shared-storage/resources/util.js"></script>
+<script src="/fenced-frame/resources/utils.js"></script>
+
+<body>
+<script>
+'use strict';
+
+promise_test(async () => {
+  const ancestor_key = token();
+  const crossOrigin = 'https://{{domains[www]}}:{{ports[https][0]}}';
+  const set_cookie_url = crossOrigin + `/cookies/resources/set-cookie.py` +
+                         `?name=key0` +
+                         `&path=/shared-storage/`;
+  const helper_url = crossOrigin +
+                     `/shared-storage/resources/credentials-test-helper.py` +
+                     `?access_control_allow_origin_header=${window.origin}` +
+                     `&token=${ancestor_key}`;
+
+  await fetch(set_cookie_url, { mode: 'no-cors', credentials: 'include' });
+
+  const worklet = await sharedStorage.createWorklet(
+    helper_url + `&action=store-cookie`,
+    { credentials: "same-origin" });
+
+  const request_cookie_fetch_response =
+    await fetch(helper_url + `&action=get-cookie`);
+
+  const request_cookie_text = await request_cookie_fetch_response.text();
+
+  assert_equals(request_cookie_text, "NO_COOKIE_HEADER");
+}, 'createWorklet() with cross-origin module script and credentials "same-origin"');
+
+</script>
+</body>
diff --git a/shared-storage/cross-origin-create-worklet-failure-missing-access-control-allow-credentials.tentative.https.sub.html b/shared-storage/cross-origin-create-worklet-failure-missing-access-control-allow-credentials.tentative.https.sub.html
new file mode 100644
index 000000000000000..598fd8f405abdc8
--- /dev/null
+++ b/shared-storage/cross-origin-create-worklet-failure-missing-access-control-allow-credentials.tentative.https.sub.html
@@ -0,0 +1,29 @@
+<!doctype html>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/common/utils.js"></script>
+<script src="/shared-storage/resources/util.js"></script>
+<script src="/fenced-frame/resources/utils.js"></script>
+
+<body>
+<script>
+'use strict';
+
+promise_test(async t => {
+  const ancestor_key = token();
+  const crossOrigin = 'https://{{domains[www]}}:{{ports[https][0]}}';
+  const helper_url = crossOrigin +
+                     `/shared-storage/resources/credentials-test-helper.py` +
+                     `?access_control_allow_origin_header=${window.origin}` +
+                     `&token=${ancestor_key}`;
+
+  return promise_rejects_dom(t, "OperationError",
+    sharedStorage.createWorklet(
+      helper_url + `&action=store-cookie`,
+      { credentials: "include" }));
+}, 'createWorklet() with cross-origin module script and credentials ' +
+   '"include", and without the Access-Control-Allow-Credentials response ' +
+   'header');
+
+</script>
+</body>
diff --git a/shared-storage/cross-origin-create-worklet-failure-missing-access-control-allow-origin.tentative.https.sub.html b/shared-storage/cross-origin-create-worklet-failure-missing-access-control-allow-origin.tentative.https.sub.html
new file mode 100644
index 000000000000000..4195d09fc06c46d
--- /dev/null
+++ b/shared-storage/cross-origin-create-worklet-failure-missing-access-control-allow-origin.tentative.https.sub.html
@@ -0,0 +1,28 @@
+<!doctype html>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/common/utils.js"></script>
+<script src="/shared-storage/resources/util.js"></script>
+<script src="/fenced-frame/resources/utils.js"></script>
+
+<body>
+<script>
+'use strict';
+
+promise_test(async t => {
+  const ancestor_key = token();
+  const crossOrigin = 'https://{{domains[www]}}:{{ports[https][0]}}';
+  const helper_url = crossOrigin +
+                     `/shared-storage/resources/credentials-test-helper.py` +
+                     `&access_control_allow_credentials_header=true` +
+                     `&token=${ancestor_key}`;
+
+  return promise_rejects_dom(t, "OperationError",
+    sharedStorage.createWorklet(
+      helper_url + `&action=store-cookie`,
+      { credentials: "include" }));
+}, 'createWorklet() with cross-origin module script and credentials ' +
+   '"include", and without the Access-Control-Allow-Origin response header');
+
+</script>
+</body>
diff --git a/shared-storage/resources/credentials-test-helper.py b/shared-storage/resources/credentials-test-helper.py
index 81a988e3581f056..46fc0ea6fb2a998 100644
--- a/shared-storage/resources/credentials-test-helper.py
+++ b/shared-storage/resources/credentials-test-helper.py
@@ -13,6 +13,12 @@ def main(request, response):
     response.status = 200
     response.headers.append(b"Content-Type", b"text/javascript")
 
+    if b"access_control_allow_credentials_header" in request.GET:
+      response.headers.append(b"Access-Control-Allow-Credentials", request.GET[b"access_control_allow_credentials_header"])
+
+    if b"access_control_allow_origin_header" in request.GET:
+      response.headers.append(b"Access-Control-Allow-Origin", request.GET[b"access_control_allow_origin_header"])
+
     if action == b"store-cookie":
       cookie = request.headers.get(b"Cookie", b"NO_COOKIE_HEADER")
       request.server.stash.put(token, cookie)
