1 files changed, 40 insertions, 0 deletions
diff --git a/testing/web-platform/tests/html/anonymous-iframe/fenced-frame.tentative.https.window.js b/testing/web-platform/tests/html/anonymous-iframe/fenced-frame.tentative.https.window.js
new file mode 100644
index 0000000000..675c136606
--- /dev/null
+++ b/testing/web-platform/tests/html/anonymous-iframe/fenced-frame.tentative.https.window.js
@@ -0,0 +1,40 @@
+// 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
+// META: timeout=long
+
+setup(() => {
+  assert_implements(window.HTMLFencedFrameElement,
+    "HTMLFencedFrameElement is not supported.");
+})
+
+// Check whether this credentialless bit propagates toward FencedFrame. It
+// shouldn't.
+promise_test(async test => {
+  const origin = get_host_info().HTTPS_ORIGIN;
+  const msg_queue = token();
+
+  // 1. Create a credentialless iframe.
+  const iframe_credentialless = newIframeCredentialless(origin);
+
+  // 2. Create a FencedFrame within it.
+  send(iframe_credentialless, `
+    const importScript = ${importScript};
+    await importScript("/common/utils.js");
+    await importScript("/html/cross-origin-embedder-policy/credentialless" +
+      "/resources/common.js");
+    await importScript("/html/anonymous-iframe/resources/common.js");
+    const frame_fenced = newFencedFrame("${origin}");
+    send("${msg_queue}", frame_fenced);
+  `);
+  const frame_fenced = await receive(msg_queue);
+
+  // 3. Expect it not to be considered credentialless.
+  send(frame_fenced, `
+    send("${msg_queue}", window.credentialless);
+  `);
+  assert_equals(await receive(msg_queue), "false",
+    "Check window.credentialless in FencedFrame");
+}, 'FencedFrame within a credentialless iframe is not credentialless')