PerformanceEventTiming: processingStart property
Limited availability
This feature is not Baseline because it does not work in some of the most widely-used browsers.
The read-only processingStart
property returns the time at which event dispatch started. This is when event handlers are about to be executed.
Value
A DOMHighResTimeStamp
timestamp.
Examples
Using the processingStart property
The processingStart
property can be used when observing event timing entries (PerformanceEventTiming
). For example, to calculate input delay or event processing times.
js
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 });
Specifications
Specification |
---|
Event Timing API # dom-performanceeventtiming-processingstart |
Browser compatibility
Report problems with this compatibility data on GitHubdesktop | mobile | |||||||||||
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processingStart |
Legend
Tip: you can click/tap on a cell for more information.
- Full support
- Full support
- No support
- No support
The compatibility table on this page is generated from structured data. If you'd like to contribute to the data, please check out https://github.com/mdn/browser-compat-data and send us a pull request.