Thanks.
LGTM to experiment from M135 to M139 inclusive (I think that's what
you've requested, at least).
On 3/10/25 7:29 PM, 'Mike Jackson' via blink-dev wrote:
Done. Sorry I missed doing that before sending the I2E.
On Monday, March 10, 2025 at 1:38:19 PM UTC-7 mike...@chromium.org wrote:
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*
mjac...@microsoft.com
*Explainer*
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%7C638769803697942336%7CUnknown%7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMDAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ%3D%3D%7C0%7C%7C%7C&sdata=l545yNmj1lynC9I%2BDSYM0WwxIf%2B7JPscZVRwqyO0CG0%3D&reserved=0>
*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
<https://nam06.safelinks.protection.outlook.com/?url=https%3A%2F%2Fdocs.google.com%2Fdocument%2Fd%2F1D6DqptsCEd3wPRsZ0q1iwVBAXXmhxZuLV-KKFI0ptCg%2Fedit%23heading%3Dh.7nki9mck5t64&data=05%7C02%7Cmjackson%40microsoft.com%7Cdc397aa61b7843369f3908dd5dc08796%7C72f988bf86f141af91ab2d7cd011db47%7C1%7C0%7C638769803697955783%7CUnknown%7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMDAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ%3D%3D%7C0%7C%7C%7C&sdata=I62vI9C34jU3P5nXvbD60nsR%2BMdmqbWoci8YcLZUX%2Fc%3D&reserved=0>
*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
<https://nam06.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgithub.com%2Fw3ctag%2Fdesign-reviews%2Fissues%2F878&data=05%7C02%7Cmjackson%40microsoft.com%7Cdc397aa61b7843369f3908dd5dc08796%7C72f988bf86f141af91ab2d7cd011db47%7C1%7C0%7C638769803697968285%7CUnknown%7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMDAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ%3D%3D%7C0%7C%7C%7C&sdata=nM5HjM1NBtOLdJjcsSC8ztVxC2j7XQ2Q%2FRoQqUhbv2Y%3D&reserved=0>
*TAG review status*
Pending
*Risks*
*Interoperability and Compatibility*
None.
/Gecko/: No signal
(https://github.com/mozilla/standards-positions/issues/1191
<https://nam06.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgithub.com%2Fmozilla%2Fstandards-positions%2Fissues%2F1191&data=05%7C02%7Cmjackson%40microsoft.com%7Cdc397aa61b7843369f3908dd5dc08796%7C72f988bf86f141af91ab2d7cd011db47%7C1%7C0%7C638769803697974689%7CUnknown%7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMDAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ%3D%3D%7C0%7C%7C%7C&sdata=BjW9lcveF2md4KwSBMdMattz93S%2BiL6dCTOuqImJedA%3D&reserved=0>)
/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
<https://nam06.safelinks.protection.outlook.com/?url=https%3A%2F%2Fchromium.googlesource.com%2Fchromium%2Fsrc%2F%2B%2Fmain%2Fdocs%2Ftesting%2Fweb_platform_tests.md&data=05%7C02%7Cmjackson%40microsoft.com%7Cdc397aa61b7843369f3908dd5dc08796%7C72f988bf86f141af91ab2d7cd011db47%7C1%7C0%7C638769803697987015%7CUnknown%7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMDAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ%3D%3D%7C0%7C%7C%7C&sdata=4tQ8p8wUbdNcbU1w9Q2ycphr9%2B26QTFSFi%2FkaFN976U%3D&reserved=0>?*
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
<https://nam06.safelinks.protection.outlook.com/?url=https%3A%2F%2Fbugs.chromium.org%2Fp%2Fchromium%2Fissues%2Fdetail%3Fid%3D1413848&data=05%7C02%7Cmjackson%40microsoft.com%7Cdc397aa61b7843369f3908dd5dc08796%7C72f988bf86f141af91ab2d7cd011db47%7C1%7C0%7C638769803697993345%7CUnknown%7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMDAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ%3D%3D%7C0%7C%7C%7C&sdata=shu8uGiF7pcS6ba5a0wPZMQlhDqSP%2FFt1c%2Fkgo%2Fmr%2B8%3D&reserved=0>
*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
<https://nam06.safelinks.protection.outlook.com/?url=https%3A%2F%2Fchromestatus.com%2Ffeature%2F5186950448283648%3Fgate%3D5434970730921984&data=05%7C02%7Cmjackson%40microsoft.com%7Cdc397aa61b7843369f3908dd5dc08796%7C72f988bf86f141af91ab2d7cd011db47%7C1%7C0%7C638769803697999701%7CUnknown%7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMDAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ%3D%3D%7C0%7C%7C%7C&sdata=FDqM0V2hX1IyOGPQqIywtNc1KKRudAbaF7N7%2F0h5DRw%3D&reserved=0>
*Links to previous Intent discussions*
Intent to Prototype:
https://groups.google.com/a/chromium.org/g/blink-dev/c/o0F7nBKsgg0/m/bJSp3ekfAAAJ
<https://nam06.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgroups.google.com%2Fa%2Fchromium.org%2Fd%2Fmsgid%2Fblink-dev%2FDM6PR00MB0751A324F65AAAAD9544C2028ED09%2540DM6PR00MB0751.namprd00.prod.outlook.com&data=05%7C02%7Cmjackson%40microsoft.com%7Cdc397aa61b7843369f3908dd5dc08796%7C72f988bf86f141af91ab2d7cd011db47%7C1%7C0%7C638769803698006323%7CUnknown%7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMDAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ%3D%3D%7C0%7C%7C%7C&sdata=aGxLAd3gKXHZFerHWRwS741opPk5%2BhEk8H6AyBok%2BRs%3D&reserved=0>
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