Having style and layout interleaved doesn't prevent us from accounting for the time each took separately.
On Fri, Mar 6, 2026 at 6:04 PM Ian Kilpatrick <[email protected]> wrote: > Ah I see Emilio gave the same feedback here: > https://github.com/w3c/long-animation-frames/pull/30#issuecomment-3819162688 > can you address this before experimenting? > > > > On Fri, Mar 6, 2026 at 9:02 AM Ian Kilpatrick <[email protected]> > wrote: > >> >> >> On Fri, Mar 6, 2026 at 8:58 AM Yoav Weiss (@Shopify) < >> [email protected]> wrote: >> >>> *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. >>> >>> >> Its incorrect to think of style and layout as two separate things now. >> They can be interleaved. What's the usecase for separating them out? E.g. >> can the API be simplified as a styleLayoutDuration and >> forcedStyleLayoutDuration ? >> >> Ian >> >> >>> *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/>. >>> >>> -- >>> You received this message because you are subscribed to the Google >>> Groups "blink-dev" group. >>> To unsubscribe from this group and stop receiving emails from it, send >>> an email to [email protected]. >>> To view this discussion visit >>> https://groups.google.com/a/chromium.org/d/msgid/blink-dev/CAOmohSJ2PJ0dZxYH48PALOSUenSSV7VuZ9CzTHnGd8u_jTKkcg%40mail.gmail.com >>> <https://groups.google.com/a/chromium.org/d/msgid/blink-dev/CAOmohSJ2PJ0dZxYH48PALOSUenSSV7VuZ9CzTHnGd8u_jTKkcg%40mail.gmail.com?utm_medium=email&utm_source=footer> >>> . >>> >> -- You received this message because you are subscribed to the Google Groups "blink-dev" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion visit https://groups.google.com/a/chromium.org/d/msgid/blink-dev/CAOmohSKnLGJ%2BHv23TXEqzOh%2BKh4dTnHZsX3hj8Q_AZBVa%3DOUzw%40mail.gmail.com.
