Event timingThe event and first-input performance entries and the PerformanceEventTiming API measures the latency of user input events, such as mouse clicks or keypresses. They're used to calculate Interaction to Next Paint (INP), a common metric for perceived responsiveness.performancePerformancenewly2025-12-12https://w3c.github.io/event-timing/https://developer.mozilla.org/docs/Web/API/EventCountsapi.EventCountsapi.EventCounts.@@iteratorapi.EventCounts.entriesapi.EventCounts.forEachapi.EventCounts.getapi.EventCounts.hasapi.EventCounts.keysapi.EventCounts.sizeapi.EventCounts.valuesapi.Performance.eventCountsapi.PerformanceEventTimingapi.PerformanceEventTiming.cancelableapi.PerformanceEventTiming.interactionIdapi.PerformanceEventTiming.processingEndapi.PerformanceEventTiming.processingStartapi.PerformanceEventTiming.targetapi.PerformanceEventTiming.toJSONhttps://nowyoucanuse.com/features--event-timing.html