The PerformanceEventTiming interface provides timing information about the latency of the first discrete user interaction, specifically one of key down, mouse down, click, a pointer down followed by a pointer up. (Pointer down may be the start of scrolling, which is not tracked.) This is a subset of the EventTiming API, but will be exposed in advance because it provides key metrics to help measure and optimize responsiveness.
Specification being incubated in a Community Group
Status in Chromium
Enabled by default
Consensus & Standardization
Last updated on 2021-12-13