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diff --git a/testing/web-platform/tests/cookies/third-party-cookies/third-party-cookies.tentative.https.html b/testing/web-platform/tests/cookies/third-party-cookies/third-party-cookies.tentative.https.html
new file mode 100644
index 0000000000..184649ff5b
--- /dev/null
+++ b/testing/web-platform/tests/cookies/third-party-cookies/third-party-cookies.tentative.https.html
@@ -0,0 +1,72 @@
+<!DOCTYPE html>
+<meta charset="utf-8"/>
+<meta name="timeout" content="long">
+<title>Test third-party cookies</title>
+<title>Test partitioned cookies</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.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>
+
+document.body.onload = async () => {
+  // Set SameSite=None cookie in a 1P context using HTTP.
+  const attributes = "Secure;Path=/;SameSite=None";
+  const httpCookieName = "1P_http";
+  await credFetch(
+      `${self.origin}/cookies/resources/set.py?${httpCookieName}=foobar;${
+          attributes}`);
+
+  // Set another cookie using document.cookie.
+  const domCookieName = "1P_dom";
+  document.cookie = `${domCookieName}=foobar;${attributes}`;
+
+  const cookieNames = [httpCookieName, domCookieName];
+
+  // Set another cookie using the CookieStore API, if supported.
+  if (window.cookieStore) {
+    const cookieStoreCookieName = "1P_cs";
+    await cookieStore.set({
+      name: cookieStoreCookieName,
+      value: "foobar",
+      path: "/",
+      sameSite: "none",
+    });
+    cookieNames.push(cookieStoreCookieName);
+  }
+
+  // Test that the cookie is available in a first-party context via HTTP.
+  testHttpCookies({
+    desc: "1P window",
+    origin: self.origin,
+    cookieNames,
+    expectsCookie: true,
+  });
+
+  // // Verify that the cookies are available to the DOM as well.
+  testDomCookies({
+    desc: "1P window",
+    cookieNames,
+    expectsCookie: true,
+  });
+  testCookieStoreCookies({
+    desc: "1P window",
+    cookieNames,
+    expectsCookie: true,
+  });
+
+  // Open a cross-site window which will embed the current origin in a
+  // third-party context.
+  const crossSiteUrl = new URL(
+      `./resources/third-party-cookies-cross-site-window.html?origin=${
+          encodeURIComponent(self.origin)}`,
+      get_host_info().HTTPS_NOTSAMESITE_ORIGIN + self.location.pathname);
+  const popup = window.open(crossSiteUrl);
+  fetch_tests_from_window(popup);
+};
+
+</script>
+</body>