How does ServiceWorker interact with non-"fully active" documents? #1594

rakina · 2021-05-20T02:49:21Z

Currently the ServiceWorker specification does not specify how it interacts with non-"fully active" (bfcached) documents/window clients.

Iterating over all clients does not filter out window clients with non-fully active documents. Example: Clients.get(), Clients.matchAll(), Clients.claim()
Actions on window clients whose document is no longer fully active can still happen. Example: Client.postMessage()

We recommend following the WIP guide we've made on handling non-fully active documents, by adding "fully active" checks so that we won't include clients with non-fully active documents, and if necessary trigger discarding of the document (e.g. for Clients.claim()). This is already how it behaves in Chrome's implementation of BFCache, and @hiroshige-g will also publish some WPTs soon to show how it behaves in various browsers.

cc @domenic @fergal @altimin

This CL adds tests for BFCache + Clients.claim(), Clients.matchAll() and unregister(). Bug: 1107415, 1204228, w3c/ServiceWorker#1594 Change-Id: I73233cf917e31dd91b974823d5490d0190f0eade

hiroshige-g · 2021-10-14T04:20:05Z

WPT: web-platform-tests/wpt#31082

According to the wpt.fyi bot, the current behavior of the browsers are:

Clients.matchAll({ includeUncontrolled: true, type: 'all' }): doesn't include BFCached pages, and does include pages restored from BFCache (Chrome/Firefox/Safari).
Clients.claim(): When called while a page is BFCached, the page is evicted from BFCache (Chrome) or the page is ignored/not claimed (Firefox/Safari).
Other: on Firefox, after a page is restored from BFCache, the page seems uncontrolled by service workers (even if it was controlled before BFCached). Is this a known issue?

wanderview · 2021-10-14T14:45:32Z

Clients.claim(): When called while a page is BFCached, the page is evicted from BFCache (Chrome) or the page is ignored/not claimed (Firefox/Safari).

I think clients.claim() not evicting on firefox is a known bug. Although maybe I am thinking of this one.

Other: on Firefox, after a page is restored from BFCache, the page seems uncontrolled by service workers (even if it was controlled before BFCached). Is this a known issue?

That seems surprising. @asutherland?

asutherland · 2021-10-14T19:13:23Z

Thank you for bringing this to my attention! I have filed https://bugzilla.mozilla.org/show_bug.cgi?id=1735875 for us to investigate further. It's very cool to see the RemoteContext mechanism at work, especially since other mechanisms like BroadcastChannel could interfere with BFCache!

asutherland · 2021-10-14T23:53:38Z

Gecko-specific detail: Following up on my previous comment, per preliminary investigation by @smaug---- we are intentionally dropping ClientHandle actors on freeze but not re-establishing them subsequently on thaw, so we likely have a clear path to addressing the problem in a timely fashion.

This CL adds tests for BFCache + Clients.claim(), Clients.matchAll() and unregister(). Bug: 1107415, 1204228, w3c/ServiceWorker#1594 Change-Id: I73233cf917e31dd91b974823d5490d0190f0eade

rakina · 2022-02-15T05:15:37Z

FYI we're aiming to land the WPTs at web-platform-tests/wpt#31082 soon, PTAL if you have time @asutherland @smaug---- :)

This CL adds tests for BFCache + Clients.claim(), Clients.matchAll() and unregister(). Bug: 1107415, 1204228, w3c/ServiceWorker#1594 Change-Id: I73233cf917e31dd91b974823d5490d0190f0eade

This CL adds tests for BFCache + Clients.claim(), Clients.matchAll() and unregister(). - Clients.claim() evicts pages that would be affected from BFCache. - Clients.matchAll() shouldn't list pages in BFCache. - unregister() shouldn't evict controlled pages from BFCache and should leave them controlled. Failing tests: - Safari/Firefox: Clients.claim() doesn't evict pages from BFCache. - Firefox: pages become uncontrolled after restored from BFCache. Bug: 1107415, 1204228, w3c/ServiceWorker#1594 Change-Id: I73233cf917e31dd91b974823d5490d0190f0eade

This CL adds tests for BFCache + navigator.serviceWorker.controller, Clients.claim(), Clients.matchAll() and unregister(). Expected behavior: - navigator.serviceWorker.controller should remain non-null for previously controlled pages after restored from BFCache. - Clients.claim() should evict pages that would be affected from BFCache. - Clients.matchAll() shouldn't list pages in BFCache. - unregister() shouldn't evict controlled pages from BFCache. Failing tests: - Safari/Firefox: Clients.claim() doesn't evict pages from BFCache. - Firefox: pages become uncontrolled after restored from BFCache. Bug: 1107415, 1204228, w3c/ServiceWorker#1594 Change-Id: I73233cf917e31dd91b974823d5490d0190f0eade

This CL adds service worker tests for BFCache: - navigator.serviceWorker.controller - Fetch interception - Clients.claim() - Clients.matchAll() and - unregister(). Expected behavior: - Controlled pages should remain controlled after restored from BFCache, i.e. navigator.serviceWorker.controller should remain non-null and fetch should be intercepted. - Clients.claim() should evict pages that would be affected from BFCache. - Clients.matchAll() shouldn't list pages in BFCache. - unregister() shouldn't evict controlled pages from BFCache. Failing tests: - service-worker-clients-claim.https.html: On Safari/Firefox, Clients.claim() doesn't evict pages from BFCache. - service-worker-controlled-after-restore.https.html: On Firefox, fetches are not intercepted after restored from BFCache while `navigator.serviceWorker.controller` is non-null. Bug: 1107415, 1204228, w3c/ServiceWorker#1594 Change-Id: I73233cf917e31dd91b974823d5490d0190f0eade

This CL adds service worker tests for BFCache: - navigator.serviceWorker.controller - Fetch interception - Clients.claim() - Clients.matchAll() and - unregister(). Expected behavior: - Controlled pages should remain controlled after restored from BFCache, i.e. navigator.serviceWorker.controller should remain non-null and fetch should be intercepted. - Clients.claim() should evict pages that would be affected from BFCache. - Clients.matchAll() shouldn't list pages in BFCache. - unregister() should evict controlled pages from BFCache. Failing tests: - service-worker-clients-claim.https.html: On Safari/Firefox, Clients.claim() doesn't evict pages from BFCache. - service-worker-controlled-after-restore.https.html: On Firefox, fetches are not intercepted after restored from BFCache while `navigator.serviceWorker.controller` is non-null. - service-worker-unregister.https.html: Controlled pages aren't evicted by unregister() (all browsers). Bug: 1107415, 1204228, w3c/ServiceWorker#1594 Change-Id: I73233cf917e31dd91b974823d5490d0190f0eade

This CL adds service worker tests for BFCache: - navigator.serviceWorker.controller - Fetch interception - Clients.claim() - Clients.matchAll() and - unregister(). Expected behavior: - Controlled pages should remain controlled after restored from BFCache, i.e. navigator.serviceWorker.controller should remain non-null and fetch should be intercepted. - Clients.claim() should evict pages that would be affected from BFCache. - Clients.matchAll() shouldn't list pages in BFCache. - unregister() should evict controlled pages from BFCache. Failing tests: - service-worker-clients-claim.https.html: On Safari/Firefox, Clients.claim() doesn't evict pages from BFCache. - service-worker-controlled-after-restore.https.html: On Firefox, fetches are not intercepted after restored from BFCache while `navigator.serviceWorker.controller` is non-null. - service-worker-unregister.https.html: Controlled pages aren't evicted by unregister() (all browsers). Bug: 1107415, 1204228, w3c/ServiceWorker#1594 Change-Id: I73233cf917e31dd91b974823d5490d0190f0eade Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3201011 Reviewed-by: Rakina Zata Amni <rakina@chromium.org> Reviewed-by: Ben Kelly <wanderview@chromium.org> Commit-Queue: Hiroshige Hayashizaki <hiroshige@chromium.org> Cr-Commit-Position: refs/heads/main@{#1008327}

…=testonly Automatic update from web-platform-tests [WPT] BFCache: service worker clients This CL adds service worker tests for BFCache: - navigator.serviceWorker.controller - Fetch interception - Clients.claim() - Clients.matchAll() and - unregister(). Expected behavior: - Controlled pages should remain controlled after restored from BFCache, i.e. navigator.serviceWorker.controller should remain non-null and fetch should be intercepted. - Clients.claim() should evict pages that would be affected from BFCache. - Clients.matchAll() shouldn't list pages in BFCache. - unregister() should evict controlled pages from BFCache. Failing tests: - service-worker-clients-claim.https.html: On Safari/Firefox, Clients.claim() doesn't evict pages from BFCache. - service-worker-controlled-after-restore.https.html: On Firefox, fetches are not intercepted after restored from BFCache while `navigator.serviceWorker.controller` is non-null. - service-worker-unregister.https.html: Controlled pages aren't evicted by unregister() (all browsers). Bug: 1107415, 1204228, w3c/ServiceWorker#1594 Change-Id: I73233cf917e31dd91b974823d5490d0190f0eade Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3201011 Reviewed-by: Rakina Zata Amni <rakina@chromium.org> Reviewed-by: Ben Kelly <wanderview@chromium.org> Commit-Queue: Hiroshige Hayashizaki <hiroshige@chromium.org> Cr-Commit-Position: refs/heads/main@{#1008327} -- wpt-commits: e08e12d17b261deeb09ee1fa7669282281c14a1f wpt-pr: 31082

This reverts commit 756b8281b5b76b2ae4561d3cf8c29a46689cf23f. Reason for revert: New tests are very flaky. Example: https://analysis.chromium.org/p/chromium/flake-portal/flakes/occurrences?key=ag9zfmZpbmRpdC1mb3ItbWVylgELEgVGbGFrZSKKAWNocm9taXVtQGJsaW5rX3dlYl90ZXN0c0BleHRlcm5hbC93cHQvaHRtbC9icm93c2Vycy9icm93c2luZy10aGUtd2ViL2JhY2stZm9yd2FyZC1jYWNoZS9zZXJ2aWNlLXdvcmtlci1jb250cm9sbGVkLWFmdGVyLXJlc3RvcmUuaHR0cHMuaHRtbAw https://analysis.chromium.org/p/chromium/flake-portal/flakes/occurrences?key=ag9zfmZpbmRpdC1mb3ItbWVyjgELEgVGbGFrZSKCAWNocm9taXVtQGJsaW5rX3dlYl90ZXN0c0BleHRlcm5hbC93cHQvaHRtbC9icm93c2Vycy9icm93c2luZy10aGUtd2ViL2JhY2stZm9yd2FyZC1jYWNoZS9zZXJ2aWNlLXdvcmtlci1jbGllbnRzLW1hdGNoYWxsLmh0dHBzLmh0bWwM Original change's description: > [WPT] BFCache: service worker clients > > This CL adds service worker tests for BFCache: > > - navigator.serviceWorker.controller > - Fetch interception > - Clients.claim() > - Clients.matchAll() and > - unregister(). > > Expected behavior: > > - Controlled pages should remain controlled after > restored from BFCache, i.e. > navigator.serviceWorker.controller should remain non-null > and fetch should be intercepted. > - Clients.claim() should evict pages > that would be affected from BFCache. > - Clients.matchAll() shouldn't list pages in BFCache. > - unregister() should evict controlled pages from BFCache. > > Failing tests: > > - service-worker-clients-claim.https.html: > On Safari/Firefox, Clients.claim() doesn't evict pages from BFCache. > - service-worker-controlled-after-restore.https.html: > On Firefox, fetches are not intercepted after restored from > BFCache while `navigator.serviceWorker.controller` is non-null. > - service-worker-unregister.https.html: > Controlled pages aren't evicted by unregister() (all browsers). > > Bug: 1107415, 1204228, w3c/ServiceWorker#1594 > Change-Id: I73233cf917e31dd91b974823d5490d0190f0eade > Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3201011 > Reviewed-by: Rakina Zata Amni <rakina@chromium.org> > Reviewed-by: Ben Kelly <wanderview@chromium.org> > Commit-Queue: Hiroshige Hayashizaki <hiroshige@chromium.org> > Cr-Commit-Position: refs/heads/main@{#1008327} Bug: 1107415, 1204228, w3c/ServiceWorker#1594 Change-Id: I56ac20a492e2b1716d27867dc9c113b097833a6c

This reverts commit 756b828. Reason for revert: New tests are very flaky. Example: https://analysis.chromium.org/p/chromium/flake-portal/flakes/occurrences?key=ag9zfmZpbmRpdC1mb3ItbWVylgELEgVGbGFrZSKKAWNocm9taXVtQGJsaW5rX3dlYl90ZXN0c0BleHRlcm5hbC93cHQvaHRtbC9icm93c2Vycy9icm93c2luZy10aGUtd2ViL2JhY2stZm9yd2FyZC1jYWNoZS9zZXJ2aWNlLXdvcmtlci1jb250cm9sbGVkLWFmdGVyLXJlc3RvcmUuaHR0cHMuaHRtbAw https://analysis.chromium.org/p/chromium/flake-portal/flakes/occurrences?key=ag9zfmZpbmRpdC1mb3ItbWVyjgELEgVGbGFrZSKCAWNocm9taXVtQGJsaW5rX3dlYl90ZXN0c0BleHRlcm5hbC93cHQvaHRtbC9icm93c2Vycy9icm93c2luZy10aGUtd2ViL2JhY2stZm9yd2FyZC1jYWNoZS9zZXJ2aWNlLXdvcmtlci1jbGllbnRzLW1hdGNoYWxsLmh0dHBzLmh0bWwM Original change's description: > [WPT] BFCache: service worker clients > > This CL adds service worker tests for BFCache: > > - navigator.serviceWorker.controller > - Fetch interception > - Clients.claim() > - Clients.matchAll() and > - unregister(). > > Expected behavior: > > - Controlled pages should remain controlled after > restored from BFCache, i.e. > navigator.serviceWorker.controller should remain non-null > and fetch should be intercepted. > - Clients.claim() should evict pages > that would be affected from BFCache. > - Clients.matchAll() shouldn't list pages in BFCache. > - unregister() should evict controlled pages from BFCache. > > Failing tests: > > - service-worker-clients-claim.https.html: > On Safari/Firefox, Clients.claim() doesn't evict pages from BFCache. > - service-worker-controlled-after-restore.https.html: > On Firefox, fetches are not intercepted after restored from > BFCache while `navigator.serviceWorker.controller` is non-null. > - service-worker-unregister.https.html: > Controlled pages aren't evicted by unregister() (all browsers). > > Bug: 1107415, 1204228, w3c/ServiceWorker#1594 > Change-Id: I73233cf917e31dd91b974823d5490d0190f0eade > Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3201011 > Reviewed-by: Rakina Zata Amni <rakina@chromium.org> > Reviewed-by: Ben Kelly <wanderview@chromium.org> > Commit-Queue: Hiroshige Hayashizaki <hiroshige@chromium.org> > Cr-Commit-Position: refs/heads/main@{#1008327} Bug: 1107415, 1204228, w3c/ServiceWorker#1594 Change-Id: I56ac20a492e2b1716d27867dc9c113b097833a6c Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3708190 Bot-Commit: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com> Owners-Override: Phillis Tang <phillis@chromium.org> Auto-Submit: Phillis Tang <phillis@chromium.org> Commit-Queue: Phillis Tang <phillis@chromium.org> Cr-Commit-Position: refs/heads/main@{#1014735}

This reverts commit 756b8281b5b76b2ae4561d3cf8c29a46689cf23f. Reason for revert: New tests are very flaky. Example: https://analysis.chromium.org/p/chromium/flake-portal/flakes/occurrences?key=ag9zfmZpbmRpdC1mb3ItbWVylgELEgVGbGFrZSKKAWNocm9taXVtQGJsaW5rX3dlYl90ZXN0c0BleHRlcm5hbC93cHQvaHRtbC9icm93c2Vycy9icm93c2luZy10aGUtd2ViL2JhY2stZm9yd2FyZC1jYWNoZS9zZXJ2aWNlLXdvcmtlci1jb250cm9sbGVkLWFmdGVyLXJlc3RvcmUuaHR0cHMuaHRtbAw https://analysis.chromium.org/p/chromium/flake-portal/flakes/occurrences?key=ag9zfmZpbmRpdC1mb3ItbWVyjgELEgVGbGFrZSKCAWNocm9taXVtQGJsaW5rX3dlYl90ZXN0c0BleHRlcm5hbC93cHQvaHRtbC9icm93c2Vycy9icm93c2luZy10aGUtd2ViL2JhY2stZm9yd2FyZC1jYWNoZS9zZXJ2aWNlLXdvcmtlci1jbGllbnRzLW1hdGNoYWxsLmh0dHBzLmh0bWwM Original change's description: > [WPT] BFCache: service worker clients > > This CL adds service worker tests for BFCache: > > - navigator.serviceWorker.controller > - Fetch interception > - Clients.claim() > - Clients.matchAll() and > - unregister(). > > Expected behavior: > > - Controlled pages should remain controlled after > restored from BFCache, i.e. > navigator.serviceWorker.controller should remain non-null > and fetch should be intercepted. > - Clients.claim() should evict pages > that would be affected from BFCache. > - Clients.matchAll() shouldn't list pages in BFCache. > - unregister() should evict controlled pages from BFCache. > > Failing tests: > > - service-worker-clients-claim.https.html: > On Safari/Firefox, Clients.claim() doesn't evict pages from BFCache. > - service-worker-controlled-after-restore.https.html: > On Firefox, fetches are not intercepted after restored from > BFCache while `navigator.serviceWorker.controller` is non-null. > - service-worker-unregister.https.html: > Controlled pages aren't evicted by unregister() (all browsers). > > Bug: 1107415, 1204228, w3c/ServiceWorker#1594 > Change-Id: I73233cf917e31dd91b974823d5490d0190f0eade > Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3201011 > Reviewed-by: Rakina Zata Amni <rakina@chromium.org> > Reviewed-by: Ben Kelly <wanderview@chromium.org> > Commit-Queue: Hiroshige Hayashizaki <hiroshige@chromium.org> > Cr-Commit-Position: refs/heads/main@{#1008327} Bug: 1107415, 1204228, w3c/ServiceWorker#1594 Change-Id: I56ac20a492e2b1716d27867dc9c113b097833a6c Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3708190 Bot-Commit: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com> Owners-Override: Phillis Tang <phillis@chromium.org> Auto-Submit: Phillis Tang <phillis@chromium.org> Commit-Queue: Phillis Tang <phillis@chromium.org> Cr-Commit-Position: refs/heads/main@{#1014735}

This CL adds service worker tests for BFCache: - navigator.serviceWorker.controller - Fetch interception - Clients.claim() - Clients.matchAll() and - unregister(). Expected behavior: - Controlled pages should remain controlled after restored from BFCache, i.e. navigator.serviceWorker.controller should remain non-null and fetch should be intercepted. - Clients.claim() should evict pages that would be affected from BFCache. - Clients.matchAll() shouldn't list pages in BFCache. - unregister() should evict controlled pages from BFCache. Failing tests: - service-worker-clients-claim.https.html: On Safari/Firefox, Clients.claim() doesn't evict pages from BFCache. - service-worker-controlled-after-restore.https.html: On Firefox, fetches are not intercepted after restored from BFCache while `navigator.serviceWorker.controller` is non-null. - service-worker-unregister.https.html: Controlled pages aren't evicted by unregister() (all browsers). Bug: 1107415, 1204228, w3c/ServiceWorker#1594 Change-Id: I73233cf917e31dd91b974823d5490d0190f0eade Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3201011 Reviewed-by: Rakina Zata Amni <rakina@chromium.org> Reviewed-by: Ben Kelly <wanderview@chromium.org> Commit-Queue: Hiroshige Hayashizaki <hiroshige@chromium.org> Cr-Commit-Position: refs/heads/main@{#1008327} NOKEYCHECK=True GitOrigin-RevId: 756b8281b5b76b2ae4561d3cf8c29a46689cf23f

This reverts commit 756b8281b5b76b2ae4561d3cf8c29a46689cf23f. Reason for revert: New tests are very flaky. Example: https://analysis.chromium.org/p/chromium/flake-portal/flakes/occurrences?key=ag9zfmZpbmRpdC1mb3ItbWVylgELEgVGbGFrZSKKAWNocm9taXVtQGJsaW5rX3dlYl90ZXN0c0BleHRlcm5hbC93cHQvaHRtbC9icm93c2Vycy9icm93c2luZy10aGUtd2ViL2JhY2stZm9yd2FyZC1jYWNoZS9zZXJ2aWNlLXdvcmtlci1jb250cm9sbGVkLWFmdGVyLXJlc3RvcmUuaHR0cHMuaHRtbAw https://analysis.chromium.org/p/chromium/flake-portal/flakes/occurrences?key=ag9zfmZpbmRpdC1mb3ItbWVyjgELEgVGbGFrZSKCAWNocm9taXVtQGJsaW5rX3dlYl90ZXN0c0BleHRlcm5hbC93cHQvaHRtbC9icm93c2Vycy9icm93c2luZy10aGUtd2ViL2JhY2stZm9yd2FyZC1jYWNoZS9zZXJ2aWNlLXdvcmtlci1jbGllbnRzLW1hdGNoYWxsLmh0dHBzLmh0bWwM Original change's description: > [WPT] BFCache: service worker clients > > This CL adds service worker tests for BFCache: > > - navigator.serviceWorker.controller > - Fetch interception > - Clients.claim() > - Clients.matchAll() and > - unregister(). > > Expected behavior: > > - Controlled pages should remain controlled after > restored from BFCache, i.e. > navigator.serviceWorker.controller should remain non-null > and fetch should be intercepted. > - Clients.claim() should evict pages > that would be affected from BFCache. > - Clients.matchAll() shouldn't list pages in BFCache. > - unregister() should evict controlled pages from BFCache. > > Failing tests: > > - service-worker-clients-claim.https.html: > On Safari/Firefox, Clients.claim() doesn't evict pages from BFCache. > - service-worker-controlled-after-restore.https.html: > On Firefox, fetches are not intercepted after restored from > BFCache while `navigator.serviceWorker.controller` is non-null. > - service-worker-unregister.https.html: > Controlled pages aren't evicted by unregister() (all browsers). > > Bug: 1107415, 1204228, w3c/ServiceWorker#1594 > Change-Id: I73233cf917e31dd91b974823d5490d0190f0eade > Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3201011 > Reviewed-by: Rakina Zata Amni <rakina@chromium.org> > Reviewed-by: Ben Kelly <wanderview@chromium.org> > Commit-Queue: Hiroshige Hayashizaki <hiroshige@chromium.org> > Cr-Commit-Position: refs/heads/main@{#1008327} Bug: 1107415, 1204228, w3c/ServiceWorker#1594 Change-Id: I56ac20a492e2b1716d27867dc9c113b097833a6c Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3708190 Bot-Commit: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com> Owners-Override: Phillis Tang <phillis@chromium.org> Auto-Submit: Phillis Tang <phillis@chromium.org> Commit-Queue: Phillis Tang <phillis@chromium.org> Cr-Commit-Position: refs/heads/main@{#1014735} NOKEYCHECK=True GitOrigin-RevId: 334fb112459f785a9d6721f5b332df63fe7262c2

This was referenced May 20, 2021

Add non-"fully active" document handling guide w3ctag/design-principles#317

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Back-forward cache meta-bug whatwg/html#5880

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mfalken self-assigned this Jun 10, 2021

mfalken mentioned this issue Jun 10, 2021

Handle non-fully active clients. #1597

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chromium-wpt-export-bot mentioned this issue Oct 14, 2021

[WPT] BFCache: service worker clients web-platform-tests/wpt#31082

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chromium-wpt-export-bot mentioned this issue Jun 15, 2022

Revert "[WPT] BFCache: service worker clients" web-platform-tests/wpt#34460

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How does ServiceWorker interact with non-"fully active" documents? #1594

How does ServiceWorker interact with non-"fully active" documents? #1594

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rakina commented Feb 15, 2022

How does ServiceWorker interact with non-"fully active" documents? #1594

How does ServiceWorker interact with non-"fully active" documents? #1594

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