performance-timeline/not-restored-reasons/performance-navigation-timing-cross-origin-bfcache.window.js

// META: title=RemoteContextHelper navigation using BFCache
// META: script=/common/dispatcher/dispatcher.js
// META: script=/common/get-host-info.sub.js
// META: script=/common/utils.js
// META: script=/resources/testharness.js
// META: script=/resources/testharnessreport.js
// META: script=/html/browsers/browsing-the-web/remote-context-helper/resources/remote-context-helper.js
// META: script=/html/browsers/browsing-the-web/remote-context-helper-tests/resources/test-helper.js
// META: script=/websockets/constants.sub.js

'use strict';

// Ensure that cross-origin subtree's reasons are not exposed to notRestoredReasons.
promise_test(async t => {
  const rcHelper = new RemoteContextHelper();
  // Open a window with noopener so that BFCache will work.
  const rc1 = await rcHelper.addWindow(
      /*config=*/ null, /*options=*/ {features: 'noopener'});
  const rc1_url = await rc1.executeScript(() => {
    return location.href;
  });
  // Add a cross-origin iframe and use BroadcastChannel.
  const rc1_child = await rc1.addIframe(
    /*extraConfig=*/ {
      origin: 'HTTP_REMOTE_ORIGIN',
      scripts: [],
      headers: [],
    },
    /*attributes=*/ {id: 'test-id'},
  );

  const domainPort = SCHEME_DOMAIN_PORT;
  await rc1_child.executeScript((domain) => {
    var ws = new WebSocket(domain + '/echo');
  }, [domainPort]);

  const rc1_child_url = await rc1_child.executeScript(() => {
    return location.href;
  });
  // Add a child to the iframe.
  const rc1_grand_child = await rc1_child.addIframe();
  const rc1_grand_child_url = await rc1_grand_child.executeScript(() => {
    return location.href;
  });

  // Navigate away.
  const rc2 = await rc1.navigateToNew();

  // Navigate back.
  await rc2.historyBack();

  // Check the reported reasons.
  await assertNotRestoredReasonsEquals(
    rc1,
    /*blocked=*/false,
    /*url=*/rc1_url,
    /*src=*/ "",
    /*id=*/"",
    /*name=*/"",
    /*reasons=*/[],
    /*children=*/[{
      "blocked": true,
      "url": "",
      "src": "",
      "id": "",
      "name": "",
      "reasons": [],
      "children": []
    }]);
});