On Fri, Aug 7, 2020 at 2:09 PM Rob Buis <rb...@igalia.com> wrote: > > I was not aware of Long Tasks API. However it seems to have a slightly > different focus (task vs. input events). Also I am mostly interested in > First Input Delay, and it was decided some time ago to not put it in > Long Tasks API (see > https://docs.google.com/document/d/1bYMLTkjcyOZR5Jt3vrulzMSoS32zOFtwyH33f6hW_C8/edit#).
The concern still withstands. We don't have dozens of slightly different APIs that websites need to track for junks & delays during user interactions. It's also unclear how this first input delay works with a single page app which may have multiple transitions after a single page load from the browser engine's perspective. There had been some discussions about this in the past in Web Perf WG but I don't think we've come to any conclusion about it. In general, I'm hesitant to have any of these APIs implemented in WebKit without figuring out more coherent picture of how they'd all fit together to address underlying use cases. - R. Niwa > On 06.08.20 20:07, Simon Fraser wrote: > > Our feedback is that this API seems reasonable, but that there's overlap > > with the "long tasks" API, > > and it's not clear if we need both. > > > > Simon > > > >> On Aug 6, 2020, at 10:43 AM, Rob Buis <rb...@igalia.com> wrote: > >> > >> Hi Webkit-Dev, > >> > >> I would like to get an official position from Webkit on the Event Timing > >> Web Perf API. > >> Besides providing information about input event latency it can be used to > >> obtain > >> First Input Timing metrics. This specification builds on the Performance > >> Timeline > >> specification, which is implemented in Webkit. Chrome has implemented the > >> Event > >> Timing API, see the chrome status entry below. > >> > >> - Specification: https://wicg.github.io/event-timing/ > >> - Explainer: https://github.com/WICG/event-timing > >> - MDN: > >> https://developer.mozilla.org/en-US/docs/Web/API/PerformanceEventTiming > >> - ChromeStatus: https://chromestatus.com/feature/5167290693713920 > >> - Caniuse.com URL: https://caniuse.com/#feat=mdn-api_performanceeventtiming > >> > >> Regards, > >> > >> Rob. > >> _______________________________________________ > >> webkit-dev mailing list > >> webkit-dev@lists.webkit.org > >> https://lists.webkit.org/mailman/listinfo/webkit-dev > _______________________________________________ > webkit-dev mailing list > webkit-dev@lists.webkit.org > https://lists.webkit.org/mailman/listinfo/webkit-dev _______________________________________________ webkit-dev mailing list webkit-dev@lists.webkit.org https://lists.webkit.org/mailman/listinfo/webkit-dev
