🏠 New in Low Baseline Support: Event timing

December 12, 2025

caniuse · mdn · spec

The 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.

Source features

• api.PerformanceEventTiming [mdn]
• api.PerformanceEventTiming.cancelable [mdn]
• api.PerformanceEventTiming.processingEnd [mdn]
• api.PerformanceEventTiming.processingStart [mdn]
• api.PerformanceEventTiming.toJSON [mdn]
• api.EventCounts [mdn]
• api.EventCounts.@@iterator [mdn]
• api.EventCounts.entries [mdn]
• api.EventCounts.forEach [mdn]
• api.EventCounts.get [mdn]
• api.EventCounts.has [mdn]
• api.EventCounts.keys [mdn]
• api.EventCounts.size [mdn]
• api.EventCounts.values [mdn]
• api.Performance.eventCounts [mdn]
• api.PerformanceEventTiming.target [mdn]
• api.PerformanceEventTiming.interactionId [mdn]