*We would like to ship this Speculation Rules (prefetch) on desktop (Windows, Mac, Linux, ChromeOS) in M110 and are seeking API owner approval to do so.*
Deltas since the original approved intent (for Android) are noted below. TAG review links are unchanged, and we're continuing to engage with TAG as they respond. We still have no signal on Mozilla and WebKit standards positions, though we can ping them again if API owners would like. Debuggability has improved, in that prefetches now appear in the Network panel and a preloading status panel is in development. Much of the code has migrated from //chrome to //content, and we expect this refactored code to be in use for stable users, when M110 reaches stable. In addition, speculation rules itself has shipped on desktop as part of Prerender2 (intent to ship <https://groups.google.com/a/chromium.org/g/blink-dev/c/cY68NkAqREg/m/tCgJaCKbAwAJ>), so what this ships is the prefetch functionality specifically, including use of the same private prefetch proxy as is used on Android under similar rules. I assume this requires 3xLGTM again, but if not, please advise. :) On Tue, Dec 6, 2022 at 2:23 PM Kevin McNee <mc...@chromium.org> wrote: > PSA: The implementation of the acceptable referrer policy restriction, > mentioned previously, was overly strict. As of this CL > <https://chromium-review.googlesource.com/c/chromium/src/+/4077268>, it > only applies to cross-site prefetches. > > On Wednesday, September 28, 2022 at 10:51:46 a.m. UTC-4 Kevin McNee wrote: > >> Bug fix PSA: An upcoming change [1] will have the implementation match >> the spec in terms of referrer policy [2]. >> >> The prefetch request will now be sent with the referring document's >> referrer policy and the resulting Referer. We also apply the restriction to >> acceptable referrer policies. Previously, the behaviour was as if the >> referring document had "no-referrer" as its policy. >> >> [1] https://chromium-review.googlesource.com/c/chromium/src/+/3910832 >> [2] >> https://wicg.github.io/nav-speculation/prefetch.html#list-of-sufficiently-strict-speculative-navigation-referrer-policies >> >> On Thursday, May 12, 2022 at 1:36:26 p.m. UTC-4 Mike Taylor wrote: >> >>> LGTM3 >>> >>> On 5/12/22 12:29 PM, Yoav Weiss wrote: >>> >>> LGTM2 >>> >>> >>> On Thu, May 12, 2022 at 6:26 PM Daniel Bratell <bratel...@gmail.com> >>> wrote: >>> >>>> LGTM1 >>>> >>>> /Daniel >>>> >>>> >>>> On 2022-05-11 09:44, Yoav Weiss wrote: >>>> >>>> >>>> >>>> On Tue, May 10, 2022 at 8:40 PM Jeremy Roman <jbro...@chromium.org> >>>> wrote: >>>> >>>>> On Tue, May 10, 2022 at 8:41 AM Yoav Weiss <yoavwe...@chromium.org> >>>>> wrote: >>>>> >>>>>> >>>>>> >>>>>> On Thu, Apr 14, 2022 at 12:36 AM Jeremy Roman <jbro...@chromium.org> >>>>>> wrote: >>>>>> >>>>>>> Contact emails >>>>>>> >>>>>>> jbro...@chromium.org, kenjibah...@chromium.org >>>>>>> >>>>>>> Explainer >>>>>>> >>>>>>> https://github.com/WICG/nav-speculation/blob/main/triggers.md >>>>>>> >>>>>>> Specification >>>>>>> >>>>>>> https://wicg.github.io/nav-speculation/speculation-rules.html >>>>>>> >>>>>>> https://wicg.github.io/nav-speculation/prefetch.html >>>>>>> >>>>>>> Summary >>>>>>> >>>>>>> Flexible syntax for defining what outgoing links are eligible to be >>>>>>> prepared speculatively before navigation. Enables access to additional >>>>>>> enhancements, such as use of a private prefetch proxy, where applicable. >>>>>>> >>>>>> >>>>>> So IIUC, this intent is for shipping cross-origin prefetch? Where >>>>>> have y'all landed on the question of cache partitioning? Which partition >>>>>> is >>>>>> storing this prefetched resource? >>>>>> >>>>> >>>>> It is isolated from any existing cache partition, and if the user does >>>>> not then navigate to the prefetched resource it is not stored further. >>>>> >>>> >>>> OK, thanks! >>>> >>>> >>>>> >>>>> This is limited to the "prefetch" action, and does not include >>>>>>> "prerender". The Chrome setting (extended preloading) which allows any >>>>>>> site >>>>>>> to request use of the private prefetch proxy and was previously >>>>>>> mentioned >>>>>>> on intents for this feature, is currently disabled for policy reasons >>>>>>> but >>>>>>> can be exposed via Finch as part of a launch, if approved. >>>>>>> >>>>>>> Blink component >>>>>>> >>>>>>> Internals>Preload >>>>>>> <https://bugs.chromium.org/p/chromium/issues/list?q=component:Internals%3EPreload> >>>>>>> >>>>>>> TAG review >>>>>>> >>>>>>> https://github.com/w3ctag/design-reviews/issues/611 >>>>>>> https://github.com/w3ctag/design-reviews/issues/721 >>>>>>> >>>>>> >>>>>> https://github.com/WICG/nav-speculation/issues/160 which seems like >>>>>> something we'd want to resolve before shipping. >>>>>> Are y'all considering this new syntax? >>>>>> Would it make sense to run this by your OT participants and/or >>>>>> partners? Web developers in general? >>>>>> >>>>> >>>>> The reason I don't think so is that this intent includes only more >>>>> basic rules which supply a list of URLs, and extending the syntax to allow >>>>> developers to select URLs from the links in the page is a future >>>>> enhancement, albeit one I'm personally excited about. I don't expect that >>>>> choices about how to express such selectors to cause compatibility issues >>>>> with plain list-of-URLs rules. >>>>> >>>> >>>> Oh, OK. Good to know! >>>> >>>> >>>>> >>>>> >>>>>>> TAG review status >>>>>>> >>>>>>> First is complete, second is pending. >>>>>>> >>>>>>> Risks >>>>>>> >>>>>>> Interoperability and Compatibility >>>>>>> >>>>>> >>>>>> Which of the 24 issues >>>>>> <https://github.com/WICG/nav-speculation/issues> open on the repo is >>>>>> relevant for this intent? Can you highlight those that may impact future >>>>>> compat and interop? >>>>>> >>>>> >>>>> It's intended that such issues be labelled with speculation-rules or >>>>> prefetch (indicating they affect one of the two pieces this would ship) >>>>> and >>>>> affects-compat. At the moment, the only such issue is this one >>>>> <https://github.com/WICG/nav-speculation/issues/133>, which I believe >>>>> is resolved as to prefetch. Looking again, any followup discussion (e.g. >>>>> regarding subresources in prerenders) fit better in another issue, so I've >>>>> closed that one. >>>>> >>>>> This issue <https://github.com/WICG/nav-speculation/issues/158> is >>>>> not so labelled, though it's marginal and arguably could be. There is some >>>>> ongoing discussion (which might become a whatwg/html issue shortly) >>>>> connected to it about when user agents should observe modification and >>>>> removal. While I would like to resolve this shortly, I expect the >>>>> practical >>>>> change to be relatively small and if anything in the direction of >>>>> providing >>>>> somewhat stronger guarantees rather than weaker ones. >>>>> >>>>> Most of the issues are with respect to either other features or >>>>> enhancements which are likely to evolve in a way that is compatible with >>>>> this. >>>>> >>>>> >>>>>>> >>>>>>> Gecko: No signal ( >>>>>>> https://github.com/mozilla/standards-positions/issues/620) >>>>>>> >>>>>>> WebKit: No signal ( >>>>>>> https://lists.webkit.org/pipermail/webkit-dev/2022-March/032158.html >>>>>>> ) >>>>>>> >>>>>>> Web developers: Some positive signal from a developer using the >>>>>>> feature, and from a developer operating a site that is prefetched using >>>>>>> this feature. >>>>>>> >>>>>> >>>>>> It'd be good to externalize such feedback if at all possible. Any >>>>>> links? >>>>>> >>>>> >>>>> I'll ask. >>>>> >>>>> >>>>>>> Other signals: >>>>>>> >>>>>>> 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? >>>>>>> >>>>>>> >>>>>>> Debuggability >>>>>>> >>>>>>> Limited, though fixing crbug.com/1315706 should provide basic >>>>>>> insight and I'm not aware of anything that would preclude us from adding >>>>>>> more sophisticated developer tools integration in the future. >>>>>>> >>>>>>> Is this feature fully tested by web-platform-tests >>>>>>> <https://chromium.googlesource.com/chromium/src/+/master/docs/testing/web_platform_tests.md> >>>>>>> ? >>>>>>> >>>>>>> Tests are being landed at speculation-rules/prefetch/ in the WPT >>>>>>> directory. We are continuing to work on adding more, though coverage in >>>>>>> some areas will require the completion of some ongoing refactoring and >>>>>>> additional test integration. >>>>>>> >>>>>>> Flag name >>>>>>> >>>>>>> The origin trial name is SpeculationRulesPrefetch. Some code >>>>>>> internally calls this SpeculationRulesPrefetchProxy, but is not limited >>>>>>> to >>>>>>> proxied prefetches exclusively. >>>>>>> >>>>>>> Requires code in //chrome? >>>>>>> >>>>>>> Some code exists in chrome/, but refactoring work is underway to >>>>>>> migrate as much of this as reasonable to content/. Some code specific >>>>>>> to, >>>>>>> e.g., the specific Google proxy service, will remain in chrome/. >>>>>>> >>>>>>> Tracking bug >>>>>>> >>>>>>> https://bugs.chromium.org/p/chromium/issues/detail?id=1173646 >>>>>>> >>>>>>> Estimated milestones >>>>>>> >>>>>>> M103 (Android) >>>>>>> >>>>>>> Since the current origin trial ends after M101, we would like to >>>>>>> extend the experiment until shipping and request a gapless launch. >>>>>>> >>>>>>> I believe a gapless launch is justified here. The speculation rules >>>>>>> API has been used by developers as part of this launch and the >>>>>>> prerendering >>>>>>> experiment >>>>>>> <https://groups.google.com/a/chromium.org/g/blink-dev/c/Kpp6uJJRrqI/m/GTo_aF0qEQAJ>. >>>>>>> There is an ongoing early access program >>>>>>> <https://github.com/buettner/private-prefetch-proxy/issues/15> for >>>>>>> publishers to opt in to receiving IP-obscured traffic enabled by this >>>>>>> feature, and have received positive feedback about this program – which >>>>>>> is >>>>>>> planned to launch by default in coordination with this web platform side >>>>>>> launch. Enforcing a gap here would interrupt this and require the >>>>>>> private >>>>>>> prefetch proxy team to notify affected partners (who are receiving >>>>>>> prefetch >>>>>>> traffic, rather than being direct users of this API), for no known >>>>>>> benefit >>>>>>> in this case. >>>>>>> >>>>>>> Shipping on desktop is not possible at this point due to extensions. >>>>>>> We expect to file a separate Intent to Ship in the future. >>>>>>> >>>>>>> Link to entry on the Chrome Platform Status >>>>>>> >>>>>>> https://chromestatus.com/feature/5740655424831488 >>>>>>> >>>>>>> Links to previous Intent discussions >>>>>>> >>>>>>> Intent to prototype: >>>>>>> https://groups.google.com/a/chromium.org/g/blink-dev/c/1q7Fp3zpjgQ >>>>>>> >>>>>>> Intent to Experiment: >>>>>>> https://groups.google.com/a/chromium.org/g/blink-dev/c/Cw-hOjT47qI/m/EObn9-4MAgAJ >>>>>>> >>>>>>> Intent to Extend Experiment: >>>>>>> https://groups.google.com/a/chromium.org/d/msgid/blink-dev/CACuR13cKaJB%3D2GQS4N3om1eSmuCVOY5zXchRCV8oCYkcq8kH0g%40mail.gmail.com >>>>>>> <https://groups.google.com/a/chromium.org/d/msgid/blink-dev/CACuR13cKaJB=2gqs4n3om1esmucvoy5zxchrcv8ocykcq8k...@mail.gmail.com> >>>>>>> >>>>>>> >>>>>>> This intent message was generated by Chrome Platform Status >>>>>>> <https://chromestatus.com/>. >>>>>>> -- >>>>>>> You received this message because you are subscribed to the Google >>>>>>> Groups "blink-dev" group. >>>>>>> To unsubscribe from this group and stop receiving emails from it, >>>>>>> send an email to blink-dev+unsubscr...@chromium.org. >>>>>>> To view this discussion on the web visit >>>>>>> https://groups.google.com/a/chromium.org/d/msgid/blink-dev/CACuR13cbVXw9nEo4zVwhGz_W65kfg0neYDqW3sMQC%2BYNzX6kfg%40mail.gmail.com >>>>>>> <https://groups.google.com/a/chromium.org/d/msgid/blink-dev/CACuR13cbVXw9nEo4zVwhGz_W65kfg0neYDqW3sMQC%2BYNzX6kfg%40mail.gmail.com?utm_medium=email&utm_source=footer> >>>>>>> . >>>>>>> >>>>>> -- >>>> You received this message because you are subscribed to the Google >>>> Groups "blink-dev" group. >>>> To unsubscribe from this group and stop receiving emails from it, send >>>> an email to blink-dev+unsubscr...@chromium.org. >>>> To view this discussion on the web visit >>>> https://groups.google.com/a/chromium.org/d/msgid/blink-dev/CAL5BFfVcLV%3DpWo%2B0dbv027%3D-okgTtmQ7azCrBNsJsspmgTVByQ%40mail.gmail.com >>>> <https://groups.google.com/a/chromium.org/d/msgid/blink-dev/CAL5BFfVcLV%3DpWo%2B0dbv027%3D-okgTtmQ7azCrBNsJsspmgTVByQ%40mail.gmail.com?utm_medium=email&utm_source=footer> >>>> . >>>> >>>> -- >>> You received this message because you are subscribed to the Google >>> Groups "blink-dev" group. >>> To unsubscribe from this group and stop receiving emails from it, send >>> an email to blink-dev+unsubscr...@chromium.org. >>> >>> To view this discussion on the web visit >>> https://groups.google.com/a/chromium.org/d/msgid/blink-dev/CAL5BFfVLNKUNTFxFPwz_EatkxZOYO-oJwFnC%2BHBTVt4rXRtxxw%40mail.gmail.com >>> <https://groups.google.com/a/chromium.org/d/msgid/blink-dev/CAL5BFfVLNKUNTFxFPwz_EatkxZOYO-oJwFnC%2BHBTVt4rXRtxxw%40mail.gmail.com?utm_medium=email&utm_source=footer> >>> . >>> >>> >>> -- You received this message because you are subscribed to the Google Groups "blink-dev" group. 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