Intent to Experiment: SoftNavigation performance entry

[Yoav Weiss]

Contact emails

yoav...@chromium.org

Explainer

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

Specification

Not yet. I want to use the OT's feedback to assess the solution's viability.

Summary

Exposes the (experimental) soft navigation heuristics to web developers, using both PerformanceObserver and the performance timeline.

Blink component

Blink>PerformanceAPIs

TAG review

Not yet.

TAG review status

Not yet.

Risks

Interoperability and Compatibility

Gecko: No signal for now. Will file once feedback confirms viability.

WebKit: No signal for now. Will file once feedback confirms viability.

Web developers: Strong support!

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?

Nope!

Goals for experimentation

I'm interested in gaining insights on the quality of the heuristic and how it compares to current heuristics employed by RUM providers or driven by framework- or app-specific knowledge. I'm also interested in knowing if developers find the correlation of various performance entries to their soft navigation ergonomic, and whether the emitted FP/FCP/LCP entries work well for them to evaluate the performance of their soft navigations.

Reason this experiment is being extended

N/A

Ongoing technical constraints

None.

Debuggability

Will this feature be supported on all six Blink platforms (Windows, Mac, Linux, Chrome OS, Android, and Android WebView)?

No

Is this feature fully tested by web-platform-tests?

Yes!

Flag name

SoftNavigationHeuristics

Requires code in //chrome?

False

Tracking bug

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

Estimated milestones

OriginTrial desktop last	112
OriginTrial desktop first	109

OriginTrial Android last	112
OriginTrial Android first	109

OriginTrial webView last	112
OriginTrial webView first	109

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

This intent message was generated by Chrome Platform Status.

[Mike Taylor]

LGTM to experiment from M109 to M112.

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[Yoav Weiss]

Update: We're bumping the experimentation from M109 to M110 (till M113), to align with partner timelines (and avoid them rediscovering bugs fixed in M109).