1 files changed, 49 insertions, 0 deletions
diff --git a/testing/web-platform/tests/cookies/third-party-cookies/resources/third-party-cookies-cross-site-embedder.html b/testing/web-platform/tests/cookies/third-party-cookies/resources/third-party-cookies-cross-site-embedder.html
new file mode 100644
index 0000000000..ec25902a91
--- /dev/null
+++ b/testing/web-platform/tests/cookies/third-party-cookies/resources/third-party-cookies-cross-site-embedder.html
@@ -0,0 +1,49 @@
+<!DOCTYPE html>
+<meta charset="utf-8"/>
+<meta name="timeout" content="long">
+<title>Window embedding a cross-site embed</title>
+<script src="/resources/testharness.js"></script>
+<script src="/common/get-host-info.sub.js"></script>
+<script src="/cookies/resources/cookie-helper.sub.js"></script>
+<script src="/cookies/third-party-cookies/resources/test-helpers.js"></script>
+
+<body>
+<script>
+
+let origin;
+
+// Test that parent window passed its origin in the URL parameters correctly.
+test(() => {
+  assert_true(window.location.search.startsWith("?origin="));
+  origin = decodeURIComponent(window.location.search.slice(
+      window.location.search.indexOf("?origin=") + 8));
+}, "Cross-site window opened correctly");
+
+// Cookies set by the parent window in a 1P context.
+const cookieNames = ["1P_http", "1P_dom"];
+if (window.cookieStore) {
+  cookieNames.push("1P_cs");
+}
+
+// Third-party cookies are blocked by default.
+assertThirdPartyHttpCookies({
+  desc: "3P fetch",
+  origin,
+  cookieNames,
+  expectsCookie: false,
+});
+
+// Create a cross-site <iframe> which embeds the cookies' origin into this
+// page.
+const iframe = document.createElement("iframe");
+const url = new URL(
+    "/cookies/third-party-cookies/resources/" +
+        "third-party-cookies-cross-site-embed.html",
+    origin);
+iframe.src = String(url);
+document.body.appendChild(iframe);
+
+fetch_tests_from_window(iframe.contentWindow);
+
+</script>
+</body>