1 files changed, 74 insertions, 0 deletions
diff --git a/testing/web-platform/tests/html/anonymous-iframe/local-storage-initial-empty-document.tentative.https.window.js b/testing/web-platform/tests/html/anonymous-iframe/local-storage-initial-empty-document.tentative.https.window.js
new file mode 100644
index 0000000000..37678ff12b
--- /dev/null
+++ b/testing/web-platform/tests/html/anonymous-iframe/local-storage-initial-empty-document.tentative.https.window.js
@@ -0,0 +1,74 @@
+// 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
+
+// This test verifies the behavior of the initial empty document nested inside
+// credentialless iframes.
+//
+// The following tree of frames and documents is used:
+//  A
+//  ├──B (credentialless)
+//  │  └──D (initial empty document)
+//  └──C (control)
+//     └──E (initial empty document)
+//
+// Storage used for D and E must be different.
+promise_test(async test => {
+  const iframe_B = newIframeCredentialless(origin);
+  const iframe_C = newIframe(origin);
+
+  // Create iframe_D and store a value in localStorage.
+  const key_D = token();
+  const value_D = "value_D";
+  const queue_B = token();
+  send(iframe_B, `
+    const iframe_D = document.createElement("iframe");
+    document.body.appendChild(iframe_D);
+    iframe_D.contentWindow.localStorage.setItem("${key_D}","${value_D}");
+    send("${queue_B}", "Done");
+  `);
+
+  // Create iframe_E and store a value in localStorage.
+  const key_E = token();
+  const value_E = "value_E";
+  const queue_C = token();
+  send(iframe_C, `
+    const iframe_E = document.createElement("iframe");
+    document.body.appendChild(iframe_E);
+    iframe_E.contentWindow.localStorage.setItem("${key_E}","${value_E}");
+    send("${queue_C}", "Done");
+  `);
+
+  assert_equals(await receive(queue_B), "Done");
+  assert_equals(await receive(queue_C), "Done");
+
+  // Try to load both values from both contexts:
+  send(iframe_B, `
+    const iframe_D = document.querySelector("iframe");
+    const value_D = iframe_D.contentWindow.localStorage.getItem("${key_D}");
+    const value_E = iframe_D.contentWindow.localStorage.getItem("${key_E}");
+    send("${queue_B}", value_D);
+    send("${queue_B}", value_E);
+  `);
+  send(iframe_C, `
+    const iframe_E = document.querySelector("iframe");
+    const value_D = iframe_E.contentWindow.localStorage.getItem("${key_D}");
+    const value_E = iframe_E.contentWindow.localStorage.getItem("${key_E}");
+    send("${queue_C}", value_D);
+    send("${queue_C}", value_E);
+  `);
+
+  // Verify the credentialless iframe and the normal one do not have access to
+  // each other.
+  assert_equals(await receive(queue_B), value_D, // key_D
+    "Credentialless iframe can access credentialless context");
+  assert_equals(await receive(queue_B), "",      // key_E
+    "Credentialless iframe can't access credentialled context");
+  assert_equals(await receive(queue_C), "",      // key_D
+    "Credentialled iframe can't access credentialless context");
+  assert_equals(await receive(queue_C), value_E, // key_E
+    "Credentialled iframe can access credentialled context");
+}, "Local storage is correctly partitioned with regards to credentialless " +
+   "iframe in initial empty documents.");