LGTM to experiment for 6 more milestones. Be sure to set those milestones in ChromeStatus so that the feature shows up in https://chromestatus.com/roadmap; I guess that might require overwriting the old "Estimated milestones" fields.
This feature seems like a great use of the origin trial system, to gather data and iterate over time. Although, based on https://github.com/WICG/soft-navigations/issues/47 and the current state of the spec, it sounds like there's still a good amount of work to do before it could be called finalized, I'm excited for web developers to get another 6 milestones of testing to inform further work. On Sat, Jul 26, 2025 at 3:50 AM Michal Mocny <mmo...@chromium.org> wrote: > Contact emailsmmo...@chromium.org, shase...@chromium.org, > yoavwe...@chromium.org > > Explainerhttps://github.com/WICG/soft-navigations > https://github.com/WICG/soft-navigations/blob/main/Design.md > > Specificationhttps://wicg.github.io/soft-navigations > > Summary > > Exposes the (experimental) soft navigation heuristics to web developers, > using both PerformanceObserver and the performance timeline. This feature > reports two new performance entries: - "soft-navigation", for user > interactions which navigate the page. Defines a new timeOrigin to help > slice the performance timeline. - "interaction-contentful-paint", which > reports on the loading performance of interactions (beyond just next > paint), used as LCP for soft-navigations. > > > Blink componentBlink>PerformanceAPIs > <https://issues.chromium.org/issues?q=customfield1222907:%22Blink%3EPerformanceAPIs%22> > > TAG reviewhttps://github.com/w3ctag/design-reviews/issues/879 > > TAG review statusIssues addressed > > Origin Trial NameSoft Navigation Heuristics > > Chromium Trial NameSoftNavigationHeuristics > > Link to origin trial feedback summary > https://github.com/WICG/soft-navigations/issues > > Origin Trial documentation link > https://github.com/WICG/soft-navigations#soft-navigations > > Risks > > > Interoperability and Compatibility > > None > > > *Gecko*: No signal ( > https://github.com/mozilla/standards-positions/issues/854) > > *WebKit*: No signal ( > https://github.com/WebKit/standards-positions/issues/235) > > *Web developers*: Strongly positive > https://github.com/WICG/proposals/issues/71#issuecomment-1325856231 > https://twitter.com/yoavweiss/status/1575191332775026688 > > *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? > > None > > > Reason this experiment is being extended > > This feature has already gone through two origin trials which ended in > milestone 123 a year ago. We took developer feedback and communicated with > web developers at the end of the trial with the following status: "The > Chrome team are taking time to review the experiment feedback and consider > the next steps for this API. We want to address some accuracy issues and > believe another origin trial will be required before the feature is ready > to progress." Over the next year we investigated the reasons for the > deficiencies, updated the implementation, and revamped the proposed API > slightly. I have created a description of these changes here: > https://github.com/WICG/soft-navigations/issues/47 Early results (local > lab testing, and field histograms in aggregate) from the current version of > the feature shows a significant improvement from a year ago, and we've > gotten positive anecdotal feedback from some early testers on Canary with > experimental features enabled. Although this feature has already had 2 > Origin trials, because there has been over a year of gap since the last > trial, we request permission for another 6 milestones extension, rather > than 3, which are necessary as we expect it will take developers some time > ramp up and collect sufficient field data to analyze give feedback, and for > us to iterate on this feedback. > > > Ongoing technical constraints > > None. > > > Debuggability > > None > > > Will this feature be supported on all six Blink platforms (Windows, Mac, > Linux, ChromeOS, Android, and Android WebView)?No > > Is this feature fully tested by web-platform-tests > <https://chromium.googlesource.com/chromium/src/+/main/docs/testing/web_platform_tests.md> > ?Yes > > Flag name on about://flagsNone > > Finch feature nameSoftNavigationHeuristics > > Requires code in //chrome?False > > Tracking bughttps://bugs.chromium.org/p/chromium/issues/detail?id=1338390 > > Estimated milestones > Origin trial desktop first 117 > Origin trial desktop last 123 > Origin trial extension 1 end milestone 123 > Origin trial extension 2 end milestone 123 > Origin trial extension 3 end milestone 145 > Origin trial Android first 117 > Origin trial Android last 123 > Origin trial WebView first 117 > Origin trial WebView last 123 > > Link to entry on the Chrome Platform Status > https://chromestatus.com/feature/5144837209194496?gate=4535580188475392 > > Links to previous Intent discussionsIntent to Prototype: > https://groups.google.com/a/chromium.org/d/msgid/blink-dev/CAL5BFfV3qRFx0i-eGJFSzqE8bnbX8XYJCvXAj0LfvO0icPo_jA%40mail.gmail.com > Intent to Experiment: > https://groups.google.com/a/chromium.org/d/msgid/blink-dev/CAL5BFfUb_Gn_5gGy8SnChg5KH2JN57Gv0NhnHN7Q_kH0Aa17CQ%40mail.gmail.com > Intent to Extend Experiment 1: > https://groups.google.com/a/chromium.org/g/blink-dev/c/xxrmKr-6X38/m/48Hri1cnAgAJ > Intent to Extend Experiment 2: > https://groups.google.com/a/chromium.org/d/msgid/blink-dev/CAL5BFfULP5d3fNCAqeO2gLP56R3HCytmaNk%2B9kpYsC2dj4%3DqoQ%40mail.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 visit > https://groups.google.com/a/chromium.org/d/msgid/blink-dev/CAEeF2TfyN4LMy2DQwjPrsTekEw8dNXgcqiogvznagjtWyfqixA%40mail.gmail.com > <https://groups.google.com/a/chromium.org/d/msgid/blink-dev/CAEeF2TfyN4LMy2DQwjPrsTekEw8dNXgcqiogvznagjtWyfqixA%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 visit https://groups.google.com/a/chromium.org/d/msgid/blink-dev/CAM0wra9S4evOpT2_8O3isM8UtE6Pc%3DTQkQJPxcJEk%3DS6rNt96A%40mail.gmail.com.
