Could you please request the privacy, security & debuggability bits in
your chromestatus entry?
On 3/10/25 11:39 AM, 'Mike Jackson' via blink-dev wrote:
*Contact emails*
mjack...@microsoft.com <mailto:mjack...@microsoft.com>
*Explainer*
https://github.com/MicrosoftEdge/MSEdgeExplainers/blob/main/PerformanceNavigationTiming%20for%20User%20Agent%20Launch/explainer.md
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*Specification*
https://github.com/MicrosoftEdge/MSEdgeExplainers/blob/main/PerformanceNavigationTiming%20for%20User%20Agent%20Launch/explainer.md
<https://nam06.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgithub.com%2FMicrosoftEdge%2FMSEdgeExplainers%2Fblob%2Fmain%2FPerformanceNavigationTiming%2520for%2520User%2520Agent%2520Launch%2Fexplainer.md&data=05%7C02%7Cmjackson%40microsoft.com%7Cdc397aa61b7843369f3908dd5dc08796%7C72f988bf86f141af91ab2d7cd011db47%7C1%7C0%7C638769803697949544%7CUnknown%7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMDAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ%3D%3D%7C0%7C%7C%7C&sdata=53CDOgKaQqUr7h0uuqV0XTreC9Xc4PjJCd4P8pfjcsg%3D&reserved=0>
*Design docs*
https://docs.google.com/document/d/1D6DqptsCEd3wPRsZ0q1iwVBAXXmhxZuLV-KKFI0ptCg/edit#heading=h.7nki9mck5t64
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*Summary*
Web applications may suffer from bimodal distribution in page load
performance, due to factors outside of the web application’s control.
For example:
* When a user agent first launches (a "cold start" scenario), it must
perform many expensive initialization tasks that compete for resources
on the system.
* Browser extensions can affect the performance of a website. For
instance, some extensions run additional code on every page you visit,
which can increase CPU usage and result in slower response times.
* When a machine is busy performing intensive tasks, it can lead to
slower loading of web pages.
In these scenarios, content the web app attempts to load will be in
competition with other work happening on the system. This makes it
difficult to detect if performance issues exist within web
applications themselves, or because of external factors.
Teams we have worked with have been surprised at the difference
between real-world dashboard metrics and what they observe in page
profiling tools. Without more information, it is challenging for
developers to understand if (and when) their applications may be
misbehaving or are simply being loaded in a contended period.
A new ‘confidence’ field on the PerformanceNavigationTiming object
will enable developers to discern if the navigation timings are
representative for their web application.
For this experiment, we are only supporting the "cold start" scenario
described above.
*Blink component*
Blink>PerformanceAPIs>NavigationTiming
<https://nam06.safelinks.protection.outlook.com/?url=https%3A%2F%2Fissues.chromium.org%2Fissues%3Fq%3Dcustomfield1222907%3A%2522Blink%253EPerformanceAPIs%253ENavigationTiming%2522&data=05%7C02%7Cmjackson%40microsoft.com%7Cdc397aa61b7843369f3908dd5dc08796%7C72f988bf86f141af91ab2d7cd011db47%7C1%7C0%7C638769803697962141%7CUnknown%7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMDAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ%3D%3D%7C0%7C%7C%7C&sdata=WdtB1JHzsqw7nptXBxD8q1M49xTT3TPMS5cXNoB6CIE%3D&reserved=0>
*TAG review*
https://github.com/w3ctag/design-reviews/issues/878
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*TAG review status*
Pending
*Risks*
*Interoperability and Compatibility*
None.
/Gecko/: No signal
(https://github.com/mozilla/standards-positions/issues/1191
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/WebKit/: No signal
(https://github.com/WebKit/standards-positions/issues/469
<https://nam06.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgithub.com%2FWebKit%2Fstandards-positions%2Fissues%2F469&data=05%7C02%7Cmjackson%40microsoft.com%7Cdc397aa61b7843369f3908dd5dc08796%7C72f988bf86f141af91ab2d7cd011db47%7C1%7C0%7C638769803697981005%7CUnknown%7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMDAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ%3D%3D%7C0%7C%7C%7C&sdata=igAq%2B%2Fm4F9UA131uMaZJCquItGmJdDdFSZ6xasXf%2BVE%3D&reserved=0>)
/Web developers/: No signals
/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*
The noise added means that the 'confidence' field isn’t immediately
useful to developers. Developers can collect this field in their Real
User Monitoring (RUM) data and with enough records, correct the data
to "eliminate the noise". One of the objectives of the experiment is
to confirm developers are successfully able to do that. We're also
interested in feedback about the API shape and ease of use.
*Ongoing technical constraints*
*Debuggability*
*Will this feature be supported on all six Blink platforms (Windows,
Mac, Linux, ChromeOS, Android, and Android WebView)?*
Yes
*Is this feature fully tested by web-platform-tests
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Yes
third_party/blink/web_tests/http/tests/misc/performance-navigation-timing-entry-confidence.tentative.html
*Flag name on about://flags*
*Finch feature name*
PerformanceNavigationTimingConfidence
*Requires code in //chrome?*
True
*Tracking bug*
https://bugs.chromium.org/p/chromium/issues/detail?id=1413848
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*Estimated milestones*
Origin trial desktop first
136
Origin trial desktop last
139
DevTrial on desktop
135
Origin trial Android first
136
Origin trial Android last
139
DevTrial on Android
135
*Link to entry on the Chrome Platform Status*
https://chromestatus.com/feature/5186950448283648?gate=5434970730921984
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*Links to previous Intent discussions*
Intent to Prototype:
https://groups.google.com/a/chromium.org/g/blink-dev/c/o0F7nBKsgg0/m/bJSp3ekfAAAJ
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