LGTM to extend to M98. 5 milestones overall seems reasonable. On Thu, Oct 7, 2021 at 8:39 AM Kenichi Ishibashi <ba...@chromium.org> wrote:
> We would like to extend Early Hints preload/preconnect Origin Trial to M98 > (originally planned to end in M96). > > Contact emailsba...@chromium.org, yhir...@chromium.org, > denom...@chromium.org > > Explainer > https://github.com/bashi/early-hints-explainer/blob/main/explainer.md > > Specificationhttps://tools.ietf.org/html/rfc8297 > > Design docs > > https://docs.google.com/document/d/1gCh_CnfrJq_VL7aGoq6skc7sn4yn5pKsM0gkHe5B9go/edit?usp=sharing > > Summary > > Support 103 Early Hints informational responses for navigation. When a 103 > response includes <link rel=preload> or other link headers Chromium tries > to preload (and/or preconnect, prefetch) specified resources even before > the final response is received. This gives Web developers a way to optimize > Core Web Vitals such as Largest Contentful Paint (LCP). > > > Blink componentInternals>Preload > <https://bugs.chromium.org/p/chromium/issues/list?q=component:Internals%3EPreload> > > TAG reviewhttps://github.com/w3ctag/design-reviews/issues/638 > > TAG review statusPending > > Risks > > > Interoperability and Compatibility > > Several servers/proxies may not understand a 103 response. They may treat > the 103 response as a part of the final response when the response is sent > over HTTP/1.1. The problem is less likely to happen over HTTP/2 thanks to > their frame format. Chromium only handles 103 responses over HTTP/2 and > HTTP/3. > > > Gecko: Worth prototyping ( > https://github.com/mozilla/standards-positions/issues/134) > > WebKit: No signal ( > https://lists.webkit.org/pipermail/webkit-dev/2021-May/031861.html) > > Web developers: Positive ( > https://www.fastly.com/blog/faster-websites-early-priority-hints) Web > developers: Positive ( > https://www.fastly.com/blog/faster-websites-early-priority-hints) > Positive interest and intent of support by popular CDNs. We've been > collaborating with Fastly to do the preliminary measurement. > > > Goals for experimentation > > Allows web developers to opt-in Early Hints preloads. We use custom page > load metrics (FCP, LCP FID) to measure performance impact. > > > Reason this experiment is being extended > > We added preconnect support in M95 based on Web developer's feedback and > we are now evaluating the impact of preload and preconnect. We realized > that we need more time to evaluate the impact of this feature. We have > partners lined up for the feature and we expect to get more data in coming > months. > > Ongoing technical constraints > > None > > Debuggability > > If a resource is preloaded by Early Hints, the corresponding > PerformanceResourceTiming object reports initiatorType is "early-hints". > For more details, see > https://chromium.googlesource.com/chromium/src/+/refs/heads/main/docs/early-hints.md#checking-early-hints-preload-is-working > > > 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/+/master/docs/testing/web_platform_tests.md> > ?No > > Flag nameEarlyHintsPreloadForNavigation > > Requires code in //chrome?False > > Tracking bughttps://crbug.com/671310 > > Launch bughttps://crbug.com/1197989 > > Estimated milestones > OriginTrial desktop last 95 → *98* > OriginTrial desktop first 94 > OriginTrial android last 95 → *98* > OriginTrial android first 94 > > Link to entry on the Chrome Platform Status > https://chromestatus.com/feature/5207422375297024 > > Links to previous Intent discussionsIntent to Experiment: > https://groups.google.com/u/1/a/chromium.org/g/blink-dev/c/xb_NHDS3twY > > > This intent message was generated by Chrome Platform Status > <https://www.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/CAPLXX-8G77uvOt6%3DomTRhQBS%2BcmxB6UaAbeeHiKRRumMPnd8bg%40mail.gmail.com > <https://groups.google.com/a/chromium.org/d/msgid/blink-dev/CAPLXX-8G77uvOt6%3DomTRhQBS%2BcmxB6UaAbeeHiKRRumMPnd8bg%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/CAL5BFfVyegQjZEym1T9Nq9e%3D0BR8U6DLZjnbTFCWLuzKnL_%2BLQ%40mail.gmail.com.
