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chromium/third_party/blink/web_tests/external/wpt/cookies/samesite/window-open.https.html 

<!DOCTYPE html>
<meta charset="utf-8"/>
<meta name="timeout" content="long">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/cookies/resources/cookie-helper.sub.js"></script>
<script>
  function create_test(origin, target, expectedStatus, title) {
    promise_test(t => {
      var value = "" + Math.random();
      return resetSameSiteCookies(origin, value)
        .then(_ => {
          return new Promise((resolve, reject) => {
            var w = window.open(target + "/cookies/resources/postToParent.py");

            var msgHandler = e => {
              window.removeEventListener("message", msgHandler);
              w.close();
              try {
                verifySameSiteCookieState(expectedStatus, value, e.data, DomSameSiteStatus.SAME_SITE);
                resolve("Popup received the cookie.");
              } catch (e) {
                reject(e);
              }
            };
            window.addEventListener("message", msgHandler);

            if (!w)
              reject("Popup could not be opened (did you allow the test site in your popup blocker?).");
          });
        });
    }, title);
  }

  // No redirect:
  create_test(SECURE_ORIGIN, SECURE_ORIGIN, SameSiteStatus.STRICT, "Same-host auxiliary navigations are strictly same-site");
  create_test(SECURE_SUBDOMAIN_ORIGIN, SECURE_SUBDOMAIN_ORIGIN, SameSiteStatus.STRICT, "Subdomain auxiliary navigations are strictly same-site");
  create_test(SECURE_CROSS_SITE_ORIGIN, SECURE_CROSS_SITE_ORIGIN, SameSiteStatus.LAX, "Cross-site auxiliary navigations are laxly same-site");

  // Redirect from {same-host,subdomain,cross-site} to same-host:
  create_test(SECURE_ORIGIN, redirectTo(SECURE_ORIGIN, SECURE_ORIGIN), SameSiteStatus.STRICT, "Same-host redirecting to same-host auxiliary navigations are strictly same-site");
  create_test(SECURE_ORIGIN, redirectTo(SECURE_SUBDOMAIN_ORIGIN, SECURE_ORIGIN), SameSiteStatus.STRICT, "Subdomain redirecting to same-host auxiliary navigations are strictly same-site");
  create_test(SECURE_ORIGIN, redirectTo(SECURE_CROSS_SITE_ORIGIN, SECURE_ORIGIN), SameSiteStatus.LAX, "Cross-site redirecting to same-host auxiliary navigations are laxly same-site");

  // Redirect from {same-host,subdomain,cross-site} to same-host:
  create_test(SECURE_SUBDOMAIN_ORIGIN, redirectTo(SECURE_ORIGIN, SECURE_SUBDOMAIN_ORIGIN), SameSiteStatus.STRICT, "Same-host redirecting to subdomain auxiliary navigations are strictly same-site");
  create_test(SECURE_SUBDOMAIN_ORIGIN, redirectTo(SECURE_SUBDOMAIN_ORIGIN, SECURE_SUBDOMAIN_ORIGIN), SameSiteStatus.STRICT, "Subdomain redirecting to subdomain auxiliary navigations are strictly same-site");
  create_test(SECURE_SUBDOMAIN_ORIGIN, redirectTo(SECURE_CROSS_SITE_ORIGIN, SECURE_SUBDOMAIN_ORIGIN), SameSiteStatus.LAX, "Cross-site redirecting to subdomain auxiliary navigations are laxly same-site");

  // Redirect from {same-host,subdomain,cross-site} to cross-site:
  create_test(SECURE_CROSS_SITE_ORIGIN, redirectTo(SECURE_ORIGIN, SECURE_CROSS_SITE_ORIGIN), SameSiteStatus.LAX, "Same-host redirecting to cross-site auxiliary navigations are laxly same-site");
  create_test(SECURE_CROSS_SITE_ORIGIN, redirectTo(SECURE_SUBDOMAIN_ORIGIN, SECURE_CROSS_SITE_ORIGIN), SameSiteStatus.LAX, "Subdomain redirecting to cross-site auxiliary navigations are laxly same-site");
  create_test(SECURE_CROSS_SITE_ORIGIN, redirectTo(SECURE_CROSS_SITE_ORIGIN, SECURE_CROSS_SITE_ORIGIN), SameSiteStatus.LAX, "Cross-site redirecting to cross-site auxiliary navigations are laxly same-site");
</script>