Contact emailsnrosent...@chromium.org

Specificationhttps://github.com/w3c/resource-timing/pull/366

Summary

Expose timings about final response headers start/end and response body
time. Requested by people who use RT-based dashboards as a consequence of
103 Early hints.


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

TAG reviewNone

TAG review statusNot applicable

Risks


Interoperability and Compatibility

This feature changes the meaning of responseStart. Since this change would
affect only for the current users of early hints, which is a new feature in
itself, the risk can be mitigated with communication. The handful of
partners known to use early hints were already contacted.


*Gecko*: Worth prototyping (
https://github.com/mozilla/standards-positions/issues/722)

*WebKit*: No signal (
https://github.com/WebKit/standards-positions/issues/109) Safari has not
implemented early hints yet, so it's not applicable yet.

*Web developers*: Positive (
https://github.com/w3c/resource-timing/issues/345) Requested by multiple
partners (Shopify, Wix)

*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


Debuggability



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

Is this feature fully tested by web-platform-tests
<https://chromium.googlesource.com/chromium/src/+/main/docs/testing/web_platform_tests.md>
?Yes

Flag nameResourceTimingInterimResponseTimes

Requires code in //chrome?False

Tracking bughttps://bugs.chromium.org/p/chromium/issues/detail?id=1402089

Estimated milestones
Shipping on desktop 115
Shipping on Android 115
Shipping on WebView 115

Anticipated spec changes

Open questions about a feature may be a source of future web compat or
interop issues. Please list open issues (e.g. links to known github issues
in the project for the feature specification) whose resolution may
introduce web compat/interop risk (e.g., changing to naming or structure of
the API in a non-backward-compatible way).
None

Link to entry on the Chrome Platform Status
https://chromestatus.com/feature/5086730938482688

Links to previous Intent discussions

This intent message was generated by Chrome Platform Status
<https://chromestatus.com/>.

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