pagehide-event-handler-microtasks.window.js

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This WPT test may be referenced by the following Test IDs:
- /html/browsers/browsing-the-web/back-forward-cache/pagehide-event-handler-microtasks.window.html - WPT Dashboard Interop Dashboard

// META: title=Assure microtasks posted by pagehide event handler are dispatched as page is BFCached

// META: script=/common/dispatcher/dispatcher.js

// META: script=/common/utils.js

// META: script=./resources/test-helper.js

'use strict';

promise_test(async t => {

  const uuid = token();

  const url = remoteExecutorUrl(uuid, {protocol: 'http:'});

  const win = window.open(url, '_blank', 'noopener');

  const context = new RemoteContext(uuid);

  // Navigate within the same eval, as (1) we can't navigate externally

  // because of potential race against the eval, and (2) we can't navigate

  // as a separate eval step as it would block on this one returning,

  // which would only happen upon `pagehide`.

  const {persisted} = await context.execute_script(

      () => new Promise(resolve => {

        window.addEventListener('pagehide', async (event) => {

          await Promise.resolve();  // ... so the rest will run as a microtask.

          resolve({persisted: event.persisted});

        }, false);

        location.href += '&navigated';

      }));

  assert_true(persisted);  // Validate we're BFCached.

}, 'Assure microtasks posted by pagehide event handler are dispatched');