1 files changed, 57 insertions, 0 deletions
diff --git a/testing/web-platform/tests/html/anonymous-iframe/local-storage.tentative.https.window.js b/testing/web-platform/tests/html/anonymous-iframe/local-storage.tentative.https.window.js
new file mode 100644
index 0000000000..bd80ff4729
--- /dev/null
+++ b/testing/web-platform/tests/html/anonymous-iframe/local-storage.tentative.https.window.js
@@ -0,0 +1,57 @@
+// META: script=/common/get-host-info.sub.js
+// META: script=/common/utils.js
+// META: script=/common/dispatcher/dispatcher.js
+// META: script=/html/cross-origin-embedder-policy/credentialless/resources/common.js
+// META: script=./resources/common.js
+
+// Make |iframe| to store |key|=|value| into LocalStorage.
+const store = async (iframe, key, value) => {
+  const response_queue = token();
+  send(iframe, `
+    localStorage.setItem("${key}", "${value}");
+    send("${response_queue}", "stored");
+  `);
+  assert_equals(await receive(response_queue), "stored");
+};
+
+// Make |iframe| to load |key| in LocalStorage. Check it matches the
+// |expected_value|.
+const load = async (iframe, key, expected_value) => {
+  const response_queue = token();
+  send(iframe, `
+    const value = localStorage.getItem("${key}");
+    send("${response_queue}", value || "not found");
+  `);
+  assert_equals(await receive(response_queue), expected_value);
+};
+
+promise_test(async test => {
+  const origin = get_host_info().HTTPS_REMOTE_ORIGIN;
+  const key_1 = token();
+  const key_2 = token();
+
+  // 4 actors: 2 credentialless iframe and 2 normal iframe.
+  const iframe_credentialless_1 = newIframeCredentialless(origin);
+  const iframe_credentialless_2 = newIframeCredentialless(origin);
+  const iframe_normal_1 = newIframe(origin);
+  const iframe_normal_2 = newIframe(origin);
+
+  // 1. Store a value in one credentialless iframe and one normal iframe.
+  await Promise.all([
+    store(iframe_credentialless_1, key_1, "value_1"),
+    store(iframe_normal_1, key_2, "value_2"),
+  ]);
+
+  // 2. Check what each of them can retrieve.
+  await Promise.all([
+    load(iframe_credentialless_1, key_1, "value_1"),
+    load(iframe_credentialless_2, key_1, "value_1"),
+    load(iframe_credentialless_1, key_2, "not found"),
+    load(iframe_credentialless_2, key_2, "not found"),
+
+    load(iframe_normal_1, key_1, "not found"),
+    load(iframe_normal_2, key_1, "not found"),
+    load(iframe_normal_1, key_2, "value_2"),
+    load(iframe_normal_2, key_2, "value_2"),
+  ]);
+}, "Local storage is correctly partitioned with regards to credentialless iframe");