[webkit-dev] Request for position on Event Timing

[Yoav Weiss]

+Nicolás Peña <npm at chromium.org>

On Sun, Aug 9, 2020 at 5:40 AM Ryosuke Niwa <rniwa at webkit.org> wrote:

> On Fri, Aug 7, 2020 at 2:09 PM Rob Buis <rbuis at 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 <rbuis at 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 at lists.webkit.org
> > >> https://lists.webkit.org/mailman/listinfo/webkit-dev
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