Contact emailsyoavwe...@chromium.org

Explainer

https://github.com/WICG/soft-navigations#soft-navigations
<https://bit.ly/soft-navigation>

Specification

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


Summary

Exposes the (experimental) soft navigation heuristics
<https://github.com/WICG/soft-navigations#soft-navigations> to web
developers, using both PerformanceObserver and the performance timeline.

Blink componentBlink>PerformanceAPIs
<https://bugs.chromium.org/p/chromium/issues/list?q=component:Blink%3EPerformanceAPIs>

TAG review
Not yet.


TAG review statusNot 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
<https://github.com/WICG/proposals/issues/71#issuecomment-1325856231>
support <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?


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
<https://chromium.googlesource.com/chromium/src/+/main/docs/testing/web_platform_tests.md>
?Yes
<https://wpt.fyi/results/soft-navigation-heuristics?label=experimental&label=master&aligned&view=subtest>
!


Flag nameSoftNavigationHeuristics

Requires code in //chrome?False

Tracking bughttps://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 discussionsIntent 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
<https://chromestatus.com/>.

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