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Explainer https://github.com/WICG/pending-beacon/blob/main/docs/fetch-later-api.md Specification https://whatpr.org/fetch/1647/9ca4bda...37a66c9.html Design docs https://github.com/WICG/pending-beacon/blob/main/docs/fetch-later-api.md https://docs.google.com/document/d/1U8XSnICPY3j-fjzG35UVm6zjwL6LvX6ETU3T8WrzLyQ/edit#heading=h.ms1oipx914vf Summary fetchLater() is a JavaScript API to request a deferred fetch. Once called, the request is queued by the browser, and will be invoked in one of the following scenarios: • The document is destroyed. • After a certain time. The API returns a FetchLaterResult that contains a boolean field "activated" that may be updated to tell whether the deferred request has been sent out or not. On successful sending, the whole response will be ignored by browser, including body and headers. Nothing at all should be processed or updated, as the page may have already be gone. Note that from the point of view of the API user, the exact send time is unknown. Blink component Blink>Network>FetchAPI Search tags beacon, pending beacon, page unload beacon, unload beacon, fetchlater TAG review https://github.com/w3ctag/design-reviews/issues/887 TAG review status Issues addressed Chromium Trial Name FetchLaterAPI Origin Trial documentation link https://chromium.googlesource.com/chromium/src/+/main/docs/experiments/fetch-later.md WebFeature UseCounter name kFetchLater Risks Interoperability and Compatibility None Gecko: Positive (https://github.com/mozilla/standards-positions/issues/703) WebKit: Support (https://github.com/WebKit/standards-positions/issues/85) Web developers: Positive (https://discourse.wicg.io/t/proposal-stateful-javascript-page-unload-beacon-api/5776) Other signals: W3C WebPerf: https://w3c.github.io/web-performance/meetings/2022/2022-03-31/index.html Security https://github.com/WICG/pending-beacon/blob/main/docs/fetch-later-api.md#security-considerations https://docs.google.com/document/d/1U8XSnICPY3j-fjzG35UVm6zjwL6LvX6ETU3T8WrzLyQ/edit?pli=1#heading=h.kztg1uvdyoki WebView application risks Does this intent deprecate or change behavior of existing APIs, such that it has potentially high risk for Android WebView-based applications? None Goals for experimentation Reason this experiment is being extended The OT originally spans from 121-126, we would like to extend it starting from 130-132, as there are implementation changes in between that we want to disable. The final API detail [1] is currently being discussed with WebKit Fetch folks. It is unlikely that we will ship the current OT version of the API behavior as we need to update implementation to accommodate for the decision. At the same time, we have received additional feedback after the previous OT extension. There are also new users currently trying to evaluate the API with their usage and need more time to collect the metrics, but our OT token will expire in early September. We would like to request an extension to help both of us. [1]: https://github.com/WICG/pending-beacon/issues/87#issuecomment-2315624105 Ongoing technical constraints See https://chromium.googlesource.com/chromium/src/+/main/docs/experiments/fetch-later.md#what_s-not-supported for what's supported and what's not supported in the OT implementation. Debuggability There are no particular debugging APIs made available or Chrome DevTools integrations yet. Will this feature be supported on all six Blink platforms (Windows, Mac, Linux, ChromeOS, Android, and Android WebView)? Yes This is a JS API that will be available to Blink platforms. Is this feature fully tested by web-platform-tests? Yes https://wpt.fyi/results/fetch/fetch-later DevTrial instructions https://chromium.googlesource.com/chromium/src/+/main/docs/experiments/fetch-later.md Flag name on chrome://flags FetchLaterAPI Finch feature name FetchLaterAPI Requires code in //chrome? True Tracking bug https://bugs.chromium.org/p/chromium/issues/detail?id=1465781 Launch bug https://launch.corp.google.com/launch/4272588 Estimated milestones Origin trial desktop first 121 Origin trial desktop last 126 Origin trial extension 1 end milestone 132 DevTrial on desktop 120 Origin trial Android first 121 Origin trial Android last 126 DevTrial on Android 120 Link to entry on the Chrome Platform Status https://chromestatus.com/feature/4654499737632768?gate=6086614150021120 Links to previous Intent discussions Intent to Prototype: https://groups.google.com/a/chromium.org/g/blink-dev/c/KXnqpUpVwPQ Intent to Experiment: https://groups.google.com/a/chromium.org/d/msgid/blink-dev/CAH3JASUZRWPgtO7b%3DQ%2BXOEEg7LMXnuoq3PFVv_EpARwbntf-ZQ%40mail.gmail.com This intent message was generated by Chrome Platform Status. -- You received this message because you are subscribed to the Google Groups "blink-dev" group. 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