LGTM to experiment M152-M157 inclusive. On Thursday, July 2, 2026 at 7:25:50 AM UTC-4 Yoav Weiss wrote:
> *Contact emails* > [email protected] > > *Explainer* > https://gist.github.com/yoavweiss/6bb2de06642b475a12205684aea2eef9 > > *Specification* > *No spec - this is an experiment-only feature.* > > *Summary* > Current viewport heuristics for speculation rules don't give any room for > developer experimentation. This experimental feature will provide such > controls, and enable developers to figure out if different heuristics > parameters give them better results than the default ones. This is a > feature *only aimed at experimentation, and there are no plans to ship it > as is*. > > *Blink component* > Blink>PerformanceAPIs > <https://issues.chromium.org/issues?q=customfield1222907:%22Blink%3EPerformanceAPIs%22> > > *Web Feature ID* > Missing feature - this feature will not exist beyond this experiment. > > *TAG review* > *N/A - as we're not intending to ship this feature, a TAG review doesn't > seem necessary.* > > *TAG review status* > N/A > > *Goals for experimentation* > Allow developers to find and report back mobile-viewport heuristic values > that work well for them and enable performance benefits from "moderate" > speculation rules. > > *Risks* > > > *Interoperability and Compatibility* > > *No interop concern, as there are no plans to ship this API as is.*No > compat concerns, as this is a new Speculation Rules rule. > > *Gecko*: No signal, as this is an experiment-only feature. > > *WebKit*: No signal, as this is an experiment-only feature. > > *Web developers*: Shopify is interested in experimenting with modified > viewport heuristics. > > *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* > > > *Ongoing technical constraints* > *No* > > *Debuggability* > *N/A - A simple added rule to speculation rules doesn't require any > debuggability accomodations.* > > *Will this feature be supported on all six Blink platforms (Windows, Mac, > Linux, ChromeOS, Android, and Android WebView)?* > No - this is aimed at mobile viewport heuristics, so Android only. > > *Is this feature fully tested by web-platform-tests > <https://chromium.googlesource.com/chromium/src/+/main/docs/testing/web_platform_tests.md>?* > No. This is not aimed to be a web exposed feature, so unit tests seem > sufficient. > > > *Flag name on about://flags* > *No information provided* > > *Finch feature name* > *SpeculationRulesModerateViewportHeuristicsControl* > > *Non-finch justification* > *No information provided* > > *Requires code in //chrome?* > False > > *Tracking bug* > https://issues.chromium.org/issues/529423512 > > *Estimated milestones* > > M152-M157 inclusive > > > *Link to entry on the Chrome Platform Status* > https://chromestatus.com/feature/6240467143491584?gate=6014326143057920 > > 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/bfe53f18-adb1-4bfe-9709-b1bac7aa084an%40chromium.org.
