Contact emailsm...@chromium.org, fer...@chromium.org,
chrome-pending-bea...@google.com

Explainerhttps://github.com/WICG/unload-beacon/blob/main/README.md

Design docs
https://docs.google.com/document/d/1QIFUu6Ne8x0W62RKJSoTtZjSd_bIM2yXZSELxdeuTFo/edit?pli=1

Summary

Page Unload Beacon API (a.k.a. PendingBeacon API) allows website authors to
specify one or more beacons (HTTP requests) that should be sent reliably
when the page is being unloaded.

Blink componentUI>Browser>Navigation>BFCache
<https://bugs.chromium.org/p/chromium/issues/list?q=component:UI%3EBrowser%3ENavigation%3EBFCache>

TAG review
https://github.com/w3ctag/design-reviews/issues/776

TAG review statusPending

Risks
N/A


Goals for experimentation


   - Collect usability feedback about the current API shape to decide how
   to improve the API design
   - Collect stability metrics of the current API implementation


Ongoing technical constraints

See "What's not supported
<https://chromium.googlesource.com/chromium/src/+/main/docs/experiments/page-unload-beacon.md#what_s-not-supported>
"

Debuggability

N/A


Will this feature be supported on all six Blink platforms (Windows, Mac,
Linux, Chrome OS, Android, and Android WebView)?Yes

Is this feature fully tested by web-platform-tests
<https://chromium.googlesource.com/chromium/src/+/main/docs/testing/web_platform_tests.md>
?Yes

DevTrial instructions
https://chromium.googlesource.com/chromium/src/+/main/docs/experiments/page-unload-beacon.md#using-command-line-flag

Flag name
--enable-features=PendingBeaconAPI
or via Origin Trial Token
<https://developer.chrome.com/origintrials/#/view_trial/1581889369113886721>

Requires code in //chrome?False

Tracking bughttps://bugs.chromium.org/p/chromium/issues/detail?id=1293679

Launch bughttps://bugs.chromium.org/p/chromium/issues/detail?id=1323615

Estimated milestones
DevTrial on desktop 107   OriginTrial on desktop  107 to 109
DevTrial on Android 107   OriginTrial on Android  107 to 109

Link to entry on the Chrome Platform Status
https://chromestatus.com/feature/5690553554436096

Links to previous Intent discussionsIntent to experiment:
https://groups.google.com/a/chromium.org/g/blink-dev/c/Vd6RTIfxkiY/m/HECcgiDOAAAJ?pli=1

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