Intent to Extend Experiment: Soft Navigation Heuristics

[Ian Clelland]

Contact emails

icle...@chromium.org

Explainer

https://bit.ly/soft-navigation
https://docs.google.com/document/d/1eUyQg3YLEmYjrTMC3p-F1MilECwCynhM6WIbIo05SPU/edit

Specification

https://wicg.github.io/soft-navigations

Summary

Exposes the (experimental) soft navigation heuristics [1] to web developers, using both PerformanceObserver and the performance timeline. [1] https://bit.ly/soft-navigation

Blink component

Blink>PerformanceAPIs

TAG review

https://github.com/w3ctag/design-reviews/issues/879

TAG review status

Issues addressed

Chromium Trial Name

SoftNavigationHeuristics

Link to origin trial feedback summary

https://github.com/WICG/soft-navigations/issues

Origin Trial documentation link

https://github.com/WICG/soft-navigations#soft-navigations

Risks

Interoperability and Compatibility

None

Gecko: No signal (https://github.com/mozilla/standards-positions/issues/854)

WebKit: No signal (https://github.com/WebKit/standards-positions/issues/235)

Web developers: Strongly positive https://github.com/WICG/proposals/issues/71#issuecomment-1325856231 https://twitter.com/yoavweiss/status/1575191332775026688

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?

None

Goals for experimentation

Reason this experiment is being extended

We are still collecting feedback from partners, who are evaluating the suitability of this API to replace existing ad-hoc methods of measuring soft navigations, including some who were only recently able to start experimenting. Additionally, we have made changes to the heuristics, in response to testing and feedback, to eliminate some false-positive detections, and better match the behaviour of real-world single-page apps. Some of these changes initially went out in Chrome 120, and were refined in Chrome 121; some will be released with Chrome 122. We'd like to give developers a chance to experiment with these changes, to help inform any future adjustments that need to be made. After Chrome 123, we intend to pause the experiment while we act on all of the feedback, and decide whether further changes to the heuristics are necessary, or if the API is in good enough shape to consider shipping.

Ongoing technical constraints

None.

Debuggability

None

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?

Yes

Flag name on chrome://flags

None

Finch feature name

SoftNavigationHeuristics

Requires code in //chrome?

False

Tracking bug

https://bugs.chromium.org/p/chromium/issues/detail?id=1338390

Estimated milestones

OriginTrial desktop last	123
OriginTrial desktop first	117

OriginTrial Android last	123
OriginTrial Android first	117

OriginTrial webView last	123
OriginTrial webView first	117

Link to entry on the Chrome Platform Status

https://chromestatus.com/feature/5144837209194496

Links to previous Intent discussions

Intent to prototype: https://groups.google.com/a/chromium.org/d/msgid/blink-dev/CAL5BFfV3qRFx0i-eGJFSzqE8bnbX8XYJCvXAj0LfvO0icPo_jA%40mail.gmail.com Intent to Experiment: https://groups.google.com/a/chromium.org/d/msgid/blink-dev/CAL5BFfUb_Gn_5gGy8SnChg5KH2JN57Gv0NhnHN7Q_kH0Aa17CQ%40mail.gmail.com
Intent to Extend Experiment: https://groups.google.com/a/chromium.org/d/msgid/blink-dev/CAL5BFfULP5d3fNCAqeO2gLP56R3HCytmaNk%2B9kpYsC2dj4%3DqoQ%40mail.gmail.com
Intent to Ship: https://groups.google.com/a/chromium.org/d/msgid/blink-dev/CAL5BFfULP5d3fNCAqeO2gLP56R3HCytmaNk%2B9kpYsC2dj4%3DqoQ%40mail.gmail.com

This intent message was generated by Chrome Platform Status.

[Mike Taylor]

LGTM to extend to 123 inclusive.

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