LGTM1 These all seem like useful improvements! :)
On Wed, Nov 22, 2023 at 8:14 PM Jeremy Roman <jbro...@chromium.org> wrote: > > > On Wed, Nov 22, 2023 at 11:10 AM Yoav Weiss <yoavwe...@chromium.org> > wrote: > >> >> >> On Thu, Nov 16, 2023 at 12:33 AM Jeremy Roman <jbro...@chromium.org> >> wrote: >> >>> Note: This intent email spans three Chromestatus entries for different >>> sub-features that we experimented with together and would like permission >>> to ship together in M121. >>> >>> Contact emailsjbro...@chromium.org, adith...@chromium.org, >>> isabo...@google.com, dome...@chromium.org, mc...@chromium.org >>> >>> Explainerhttps://github.com/WICG/nav-speculation/blob/main/triggers.md >>> >>> Specification >>> https://wicg.github.io/nav-speculation/speculation-rules.html >>> >>> Summary >>> >>> (1) An extension to speculation rules syntax that lets the browser >>> obtain URLs for speculation from link elements in a page. They may include >>> criteria which restrict which of these links can be used. >>> >> >> Any specific parts of the explainer/spec that cover this one? >> > > Sure: > > https://github.com/WICG/nav-speculation/blob/main/triggers.md#document-rules > > https://wicg.github.io/nav-speculation/speculation-rules.html#document-rule-predicate-matching > > https://wicg.github.io/nav-speculation/speculation-rules.html#find-matching-links > That's very useful, thanks!! > > > >>> (2) Adding the eagerness field to the speculation rules will let the >>> developers control how eagerly the browser preloads links in order to >>> balance the performance advantage against resource overhead. This field >>> accepts one of "conservative", "moderate", "eager", or "immediate" strings >>> as the value, and it is applicable to both "prefetch" and "prerender" >>> actions and both "list" or "document" sources. If not explicitly specified, >>> list rules default to "immediate" and document rules default to >>> "conservative". >>> >>> >>> (3) Currently developers can only specify speculation rules using inline >>> script tags. The proposed feature provides an alternative through the >>> "Speculation-Rules" header. Its value must be a URL to a text resource with >>> "application/speculationrules+json" MIME type. The resource's rules will be >>> added to the document's rule set. >>> >>> >>> Blink componentInternals>Preload >>> <https://bugs.chromium.org/p/chromium/issues/list?q=component:Internals%3EPreload> >>> >>> TAG reviewhttps://github.com/w3ctag/design-reviews/issues/721 >>> >>> TAG review statusIssues addressed (TAG still has reservations) >>> >>> Chromium Trial NameSpeculationRulesPrefetchFuture >>> >>> Link to origin trial feedback summary >>> https://docs.google.com/document/d/13cJcoygFD64UcQH-P30dXCLbdD6SXpQwhpOUym64KXw/edit?usp=sharing >>> >>> Origin Trial documentation link >>> https://github.com/WICG/nav-speculation/blob/main/chrome-2023q1-experiment-overview.md >>> >>> WebFeature UseCounter nameSpeculationRulesDocumentRules >>> SpeculationRulesSelectorMatches >>> SpeculationRulesHeader >>> SpeculationRulesExplicitEagerness >>> >>> Risks >>> >>> >>> Interoperability and Compatibility >>> >>> Because authors cannot rely on document rules being evaluated (or >>> preloading generally), applications which use them should function >>> correctly in other browsers and should continue to function correctly were >>> the feature to be deprecated. Of course, ideally other browsers do find it >>> compelling to implement this feature. >>> >>> >>> Similar reasoning applies to the response header and eagerness field. >>> >>> >>> *Gecko*: No signal ( >>> https://github.com/mozilla/standards-positions/issues/620) >>> >>> *WebKit*: No signal ( >>> https://github.com/WebKit/standards-positions/issues/54) >>> >>> *Web developers*: Positive ( >>> https://groups.google.com/a/chromium.org/g/blink-dev/c/L3mpXE1x3Zk/m/VvbMZrcsAQAJ) >>> positive feedback from Akamai and use within Chrome on web.dev >>> >>> *Other signals*: >>> >>> Activation >>> >>> Some developers might not be immediately aware of which URLs they can >>> prefetch or prerender without side effects; this risk is reduced if they >>> primarily use the feature for same-origin URL patterns they are familiar >>> with. >>> >>> >>> Security >>> >>> See >>> https://wicg.github.io/nav-speculation/speculation-rules.html#security-considerations >>> . >>> >>> >>> 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 >>> >>> Speculative loading which occurs is visible in the Network panel and the >>> new Preloading panel. Console warnings are logged when several types of >>> issues are encountered. >>> >>> >>> Will this feature be supported on all six Blink platforms (Windows, Mac, >>> Linux, Chrome OS, Android, and Android WebView)?Yes (though some >>> capabilities vary per platform) >>> >>> Is this feature fully tested by web-platform-tests >>> <https://chromium.googlesource.com/chromium/src/+/main/docs/testing/web_platform_tests.md> >>> ?Yes >>> >>> >>> https://wpt.fyi/results/speculation-rules?label=experimental&label=master&aligned >>> Some tests cover behavior which isn't enabled by default (even if >>> experimental web platform features are on). >>> >>> >>> Flag name on chrome://flags >>> >>> Finch feature nameSpeculationRulesPrefetchFuture >>> >>> Requires code in //chrome?False >>> >>> Tracking bug >>> https://bugs.chromium.org/p/chromium/issues/detail?id=1371522 >>> https://bugs.chromium.org/p/chromium/issues/detail?id=1406595 >>> https://bugs.chromium.org/p/chromium/issues/detail?id=1366940 >>> >>> Estimated milestones >>> Shipping on desktop 121 >>> OriginTrial desktop last 120 >>> OriginTrial desktop first 110 >>> Shipping on Android 121 >>> OriginTrial Android last 120 >>> OriginTrial Android first 110 >>> OriginTrial webView last 120 >>> OriginTrial webView first 110 >>> >>> Anticipated spec changes >>> >>> A URLPattern change was made to facilitate this, and document rules will >>> be affected by upstream changes to URLPattern. Similarly, upstream changes >>> to CSS selectors will affect document rules which use selectors to match. >>> Some minor changes to how links are identified may happen in the future. We >>> anticipate most changes to be compatible. >>> >>> Link to entry on the Chrome Platform Status >>> https://chromestatus.com/feature/5112150536749056 >>> https://chromestatus.com/feature/5091678266851328 >>> https://chromestatus.com/feature/5069400512659456 >>> >>> Links to previous Intent discussionsIntent to prototype: >>> https://groups.google.com/a/chromium.org/d/msgid/blink-dev/CA%2B5JZsPqZakqnGx2zgreGEfRCJ1Xrr16cL2gcqGF7577dFhvsw%40mail.gmail.com >>> Intent >>> to Experiment: >>> https://groups.google.com/a/chromium.org/g/blink-dev/c/3-0rLTZePzc/m/VNHWAdAGDQAJ >>> Intent to Extend Experiment: >>> https://groups.google.com/a/chromium.org/d/msgid/blink-dev/CACuR13epuEiXzbO3HJq0O9eum5_parJYHWHuje7QztZRd-s56w%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 on the web visit >>> https://groups.google.com/a/chromium.org/d/msgid/blink-dev/CACuR13dJ%2BLypC7QmGmwvoGn3%2BhPs77bDa-NFDWTw0bA5WDhsWA%40mail.gmail.com >>> <https://groups.google.com/a/chromium.org/d/msgid/blink-dev/CACuR13dJ%2BLypC7QmGmwvoGn3%2BhPs77bDa-NFDWTw0bA5WDhsWA%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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