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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 Speculation Rules is a flexible syntax for defining what outgoing links are eligible to be prepared speculatively before navigation. It enables access to additional enhancements, such as use of a private prefetch proxy, where applicable. Participants in this trial can use this syntax to request prefetching of links they expect the user is likely to visit next. This is a request to extend the previous experiment <https://groups.google.com/a/chromium.org/g/blink-dev/c/Cw-hOjT47qI/m/EObn9-4MAgAJ>. We would like to extend the experiment for milestones M98 to M101 (inclusive), in order to continue to gather data as a partner makes improvements to their integration and to shave some of the rough edges off the feature. There is an ongoing early access program <https://github.com/buettner/private-prefetch-proxy/issues/15#issuecomment-952207477> to allow more publishers to receive IP anonymized traffic as we refine this. We now support "prefetch" rules and intend to deprecate "prefetch_with_subresources" (at least for now) during this extension. Cross-origin uncredentialed prefetch without IP anonymization is now supported. Users can now enable access to IP anonymization from any origin through a Chrome setting. Internal analysis from the current experiment with significant improvement to the largest contentful paint time when successful. Though prefetching with subresources (NoStatePrefetch) provides some additional improvement, it incurs over a much higher byte cost on average. We believe that in most cases prefetching more possible outgoing navigation is typically a better tradeoff than also prefetching subresources, so we are focusing on shipping prefetch of the main resource. Many outbound navigations are currently ineligible due to cookies existing on the destination site, which motivates future improvements to allow sites to participate in uncredentialed prefetch through an additional opt-in. (I've requested clearance to release approximate numbers, but that hasn't been approved at this point.) 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 TAG review status Complete (recommended followup review TBA) Risks Interoperability and Compatibility Gecko: No signal WebKit: No signal Web developers: Past success with <link rel=prefetch> <https://web.dev/link-prefetch/> and libraries like QuickLink, and discussion with some partners suggests interest in this space. Goals for experimentation To gather feedback about the convenience of the Speculation Rules syntax, and to gather data about performance improvements for navigations that are prefetched, directly and via a private prefetch proxy (subject to the limitations mentioned above). Ongoing technical constraints No significant technical constraints anticipated. Will this feature be supported on all six Blink platforms (Windows, Mac, Linux, Chrome OS, Android, and Android WebView)? Chrome for Android (non-WebView) only, at present. Eventually other platforms will be supported. Is this feature fully tested by web-platform-tests <https://chromium.googlesource.com/chromium/src/+/master/docs/testing/web_platform_tests.md> ? Not yet, but we have plans to <https://github.com/jeremyroman/alternate-loading-modes/blob/main/speculation-rules-testing.md> . Flag name The origin trial feature name will continue to be SpeculationRulesPrefetch. Tracking bug https://bugs.chromium.org/p/chromium/issues/detail?id=1173646 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/CY7qVZP5AQAJ Intent to continue experimenting: https://groups.google.com/a/chromium.org/g/blink-dev/c/T3nKEipKv-4/m/rKJ0uFR3BAAJ -- 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 on the web visit https://groups.google.com/a/chromium.org/d/msgid/blink-dev/CACuR13cKaJB%3D2GQS4N3om1eSmuCVOY5zXchRCV8oCYkcq8kH0g%40mail.gmail.com.
