*Contact emails*
[email protected]

*Explainer*
https://github.com/w3c/long-animation-frames/pull/30#issue-3828859369

*Specification*
https://github.com/w3c/long-animation-frames/pull/30

*Summary*
Add `styleDuration`, `forcedStyleDuration`, `layoutDuration` and
`forcedLayoutDuration` information to the Long Animation Frame API,
enabling developers to distinguish style and layout times.

*Blink component*
Blink>PerformanceAPIs
<https://issues.chromium.org/issues?q=customfield1222907:%22Blink%3EPerformanceAPIs%22>

*Web Feature ID*
Missing feature

*TAG review*
*Not yet.*

*TAG review status*
Pending

*Risks*


*Interoperability and Compatibility*
*New attributes, so no compatibility risk. In terms of Interop, this
doesn't increase the interop risk of LoAF, which is currently only shipped
in Chromium.*

*Gecko*: No signal

*WebKit*: No signal

*Web developers*: Shopify developers need the data these attributes expose
in order to better understand CSS performance bottlenecks in the wild.

*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?
*No.*


*Goals for experimentation*
*See if the API provides the right data that enables developers to
understand their CSS performance bottlenecks.*

*Ongoing technical constraints*
*No.*

*Debuggability*
*Not applicable.*

*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://chromium.googlesource.com/chromium/src/+/main/docs/testing/web_platform_tests.md>?*
Yes.


*Flag name on about://flags*
*No information provided*

*Finch feature name*
*LongAnimationFrameStyleDuration*

*Non-finch justification*
*No information provided*

*Requires code in //chrome?*
False

*Tracking bug*
https://issues.chromium.org/issues/476826067

*Estimated milestones*

M147-M152


*Link to entry on the Chrome Platform Status*
https://chromestatus.com/feature/5171478175809536?gate=5452953152520192

*Links to previous Intent discussions*
Intent to Prototype:
https://groups.google.com/a/chromium.org/d/msgid/blink-dev/CAOmohSJxRuMp6Ha5RVCjzNfsG0Sj96Y%3Dgy9LnxtM%2Brq-S6DEew%40mail.gmail.com


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

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