response-start-after-coop-bcg-switch.https.html

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This WPT test may be referenced by the following Test IDs:
- /navigation-timing/response-start-after-coop-bcg-switch.https.html - WPT Dashboard Interop Dashboard

<!doctype html>

<meta charset="utf-8">

<title>Navigation Timing responseStart after a COOP browsing context group switch</title>

<link rel="help" href="https://w3c.github.io/navigation-timing/#dom-performancenavigationtiming-responsestart">

<link rel="help" href="https://html.spec.whatwg.org/multipage/origin.html#cross-origin-opener-policies">

<script src="/resources/testharness.js"></script>

<script src="/resources/testharnessreport.js"></script>

<script src="/common/dispatcher/dispatcher.js"></script>

<script src="/common/utils.js"></script>

<script>

const redirectTo = destination => {

  const url = new URL("/common/redirect-opt-in.py", location.href);

  url.searchParams.set("location", destination);

  return url;

};

promise_test(async t => {

  const responseToken = token();

  const iframeToken = token();

  const popup = window.open("/common/blank.html", token());

  assert_not_equals(popup, null, "Popup should be opened");

  t.add_cleanup(async () => {

    await send(iframeToken, "close");

    popup.close();

});

  await new EventWatcher(t, popup, "load").wait_for("load");

  const postbackURL = new URL(make_absolute_url({ path: "/html/cross-origin-opener-policy/resources/postback.html" }));

  postbackURL.searchParams.set("channel", "null");

  postbackURL.searchParams.set("responseToken", responseToken);

  postbackURL.searchParams.set("iframeToken", iframeToken);

  const finalURL = new URL(make_absolute_url({

    subdomain: "www",

    path: "/navigation-timing/resources/coop-response-start.html",

  }));

  finalURL.searchParams.set("postback", postbackURL.href);

  const firstRedirectURL = redirectTo(finalURL.href);

  const secondRedirectURL = redirectTo(firstRedirectURL.href);

  popup.location = secondRedirectURL.href;

  const navigationTiming = JSON.parse(await receive(responseToken));

  assert_equals(navigationTiming.name, finalURL.href, "The popup should report the final navigation URL");

  assert_equals(navigationTiming.redirectCount, 0, "The cross-origin navigation should not expose the redirect count");

  assert_greater_than(navigationTiming.responseStart, 0, "responseStart should not be clamped to zero after the COOP browsing context group switch");

  assert_greater_than_equal(navigationTiming.responseStart, navigationTiming.requestStart, "responseStart should be after requestStart");

  assert_greater_than_equal(navigationTiming.responseEnd, navigationTiming.responseStart, "responseEnd should be after responseStart");

}, "Navigation responseStart is not clamped to zero after a cross-origin COOP browsing context group switch");

</script>