I'm generally concerned about the proliferation of all these X timing API. It's hard to review the aspect of "first input timing" because its definition is imprecise: https://github.com/WICG/event-timing/issues/91

On Thu, Aug 6, 2020 at 11:07 AM Simon Fraser <simon.fraser@apple.com> 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@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.
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