LGTM3 On Tue, Oct 27, 2026 at 11:35 PM Mike Taylor <[email protected]> wrote:
> LGTM2 > On 10/27/26 6:51 p.m., Alex Russell wrote: > > Thanks for the data. It's exciting to hear about such a large performance > improvement. > > LGTM1 > > Not blocking, but just curious: it would be unfortunate if the major > customers of this API were ad systems. Do we have good data from non-ads > use-cases? > > Best, > > Alex > > On Wednesday, October 21, 2026 at 6:53:04 PM UTC-7 Yoichi Osato wrote: > >> > This Intent mentions an OT; was there feedback from developers about >> the utility of x-origin iframe pre-rendering? >> Yes, one of our customers shows significant performance improvement(68%!) on >> speculative loading with this feature. >> >> > Did we learn anything about the potential risks (e.g., to metrics and >> privacy)? >> No report from OT attendees so far. >> >> 2026年10月22日(木) 0:24 Alex Russell <[email protected]>: >> >>> Do we have a sense for which sorts of applications will benefit from >>> this change? This Intent mentions an OT; was there feedback from developers >>> about the utility of x-origin iframe pre-rendering? Did we learn anything >>> about the potential risks (e.g., to metrics and privacy)? >>> >>> Thanks, >>> >>> Alex >>> >>> On Wednesday, October 14, 2026 at 11:28:21 PM UTC-7 Chromestatus wrote: >>> >>>> *Contact emails* >>>> [email protected] >>>> >>>> *Explainer* >>>> >>>> https://github.com/WICG/nav-speculation/blob/main/prerendering-cross-origin-iframes.md >>>> >>>> *Specification* >>>> https://wicg.github.io/nav-speculation/prerendering.html >>>> >>>> *Summary* >>>> Prerenders cross-origin iframes with an opt-in response header. >>>> Browsers will now prerender all cross-origin frames if the top-level >>>> frame's HTTP response includes the Supports-Loading-Mode: >>>> prerender-cross-origin-frames. >>>> >>>> *Blink component* >>>> Blink >>>> <https://issues.chromium.org/issues?q=customfield1222907:%22Blink%22> >>>> >>>> *Web Feature ID* >>>> speculation-rules <https://webstatus.dev/features/speculation-rules> >>>> >>>> *Motivation* >>>> By default, navigational prerendering delays the loading of all >>>> cross-origin iframes until the referring page activates the prerendered >>>> page. However, there are some cases where cross-origin iframes are >>>> particularly important to an application, such that delaying them negates >>>> many of the benefits of prerendering. >>>> >>>> *Initial public proposal* >>>> >>>> https://groups.google.com/a/chromium.org/g/blink-dev/c/KP1f2UTqCgM/m/q_EQ5ceXHgAJ >>>> >>>> *TAG review* >>>> https://github.com/w3ctag/design-reviews/issues/1207 >>>> >>>> *TAG review status* >>>> Issues addressed >>>> >>>> *Origin Trial Name* >>>> Prerendering cross-origin iframes >>>> >>>> *Goals for experimentation* >>>> Gather feedback from web authors who already are interested in this >>>> feature. >>>> >>>> *Chromium Trial Name* >>>> Prerender2CrossOriginIframes >>>> >>>> *Origin Trial documentation link* >>>> >>>> https://github.com/WICG/nav-speculation/blob/main/prerendering-cross-origin-iframes.md >>>> >>>> *WebFeature UseCounter name* >>>> kPrerender2CrossOriginIframes >>>> >>>> *Risks* >>>> >>>> >>>> *Interoperability and Compatibility* >>>> The entire speculative loading feature is a progressive enhancement, so >>>> in general risks are low in this area. >>>> >>>> *Gecko*: No signal ( >>>> https://github.com/mozilla/standards-positions/issues/1376) No signal >>>> as of 2026-10-15 >>>> >>>> *WebKit*: No signal ( >>>> https://github.com/WebKit/standards-positions/issues/636) No signal as >>>> of 2026-10-15 >>>> >>>> *Web developers*: Positive Our partners have given positive feedback >>>> on this feature. >>>> >>>> *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? >>>> No. >>>> >>>> >>>> *Debuggability* >>>> The cross-origin iframe prerendering should be debuggable as well as >>>> top frame's one: >>>> https://developer.chrome.com/docs/devtools/application/debugging-speculation-rules#prerender >>>> >>>> *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://flags* >>>> "prerender2-cross-origin-iframes" from M148 >>>> >>>> *Finch feature name* >>>> Prerender2CrossOriginIframes >>>> >>>> *Rollout plan* >>>> Will ship enabled for all users >>>> >>>> *Requires code in //chrome?* >>>> False >>>> >>>> *Tracking bug* >>>> https://issues.chromium.org/issues/440387014 >>>> >>>> *Availability expectation* >>>> Feature is available only in Chromium browsers for the foreseeable >>>> future. >>>> >>>> *Adoption expectation* >>>> Feature is used by specific partner(s) to provide functionality within >>>> 12 months of launch in Chrome. >>>> >>>> *Adoption plan* >>>> One of our partners has already joined in origin trial in Chrome and >>>> shows better performance result. >>>> >>>> *Non-OSS dependencies* >>>> >>>> Does the feature depend on any code or APIs outside the Chromium open >>>> source repository and its open-source dependencies to function? >>>> No. >>>> >>>> *Estimated milestones* >>>> Shipping on desktop 158 >>>> Origin trial desktop first 147 >>>> Origin trial desktop last 152 >>>> Origin trial extension 1 end milestone 158 >>>> Shipping on Android 158 >>>> Shipping on WebView 158 >>>> Shipping on iOS 158 >>>> >>>> *Anticipated spec changes* >>>> >>>> Open questions about a feature may be a source of future web compat or >>>> interop issues. Please list open issues (e.g. links to known github issues >>>> in the project for the feature specification) whose resolution may >>>> introduce web compat/interop risk (e.g., changing to naming or structure of >>>> the API in a non-backward-compatible way). >>>> *No information provided* >>>> >>>> *Link to entry on the Chrome Platform Status* >>>> https://chromestatus.com/feature/5112398709129216?gate=5121426126405632 >>>> >>>> *Links to previous Intent discussions* >>>> Intent to Prototype: >>>> https://groups.google.com/a/chromium.org/d/msgid/blink-dev/68b670ba.050a0220.270bc4.0593.GAE%40google.com >>>> Intent to Experiment: >>>> https://groups.google.com/a/chromium.org/d/msgid/blink-dev/CAAEV3p%3DzhNhfOpe8x%3DRKgxYFS9GCq_q-c8knZYRBRuijQ27o8w%40mail.gmail.com >>>> Intent to Extend Experiment 1: >>>> https://groups.google.com/a/chromium.org/d/msgid/blink-dev/6a45fcf5.198129d7.1d0cd0.0014.GAE%40google.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 [email protected]. > To view this discussion visit > https://groups.google.com/a/chromium.org/d/msgid/blink-dev/711e83ed-5e6d-4b36-ae28-5c4d04a6a568n%40chromium.org > <https://groups.google.com/a/chromium.org/d/msgid/blink-dev/711e83ed-5e6d-4b36-ae28-5c4d04a6a568n%40chromium.org?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 [email protected]. > To view this discussion visit > https://groups.google.com/a/chromium.org/d/msgid/blink-dev/0c665826-82e5-4c57-9f0e-8688b3421c5a%40chromium.org > <https://groups.google.com/a/chromium.org/d/msgid/blink-dev/0c665826-82e5-4c57-9f0e-8688b3421c5a%40chromium.org?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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