Limited availability
The read-only processingStart property returns the time at which event dispatch started. This is when event handlers are about to be executed.
A DOMHighResTimeStamp timestamp.
The processingStart property can be used when observing event timing entries (PerformanceEventTiming). For example, to calculate input delay or event processing times.
const observer = new PerformanceObserver((list) => {
list.getEntries().forEach((entry) => {
// Full duration
const duration = entry.duration;
// Input delay (before processing event)
const delay = entry.processingStart - entry.startTime;
// Synchronous event processing time
// (between start and end dispatch)
const time = entry.processingEnd - entry.processingStart;
});
});
// Register the observer for events
observer.observe({ type: "event", buffered: true });
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