Web platform features explorer

The longtask performance event type and the PerformanceLongTaskTiming API provides information about tasks that occupy the UI thread for 50 milliseconds or more, a metric for input latency, delayed animations, and other sources of "jank."

Status

Limited availability

MDN documentation

PerformanceLongTaskTiming

Specifications

Long Tasks API, from Web Performance Working Group (W3C).

Browser support

Chrome 58 Released on 2017-04-19
Chrome Android 58 Released on 2017-04-25
Edge 79 Released on 2020-01-15
Firefox ❌ See bugzil.la/1348405 Vendor position : unknown
Firefox for Android ❌ See bugzil.la/1348405 Vendor position : unknown
Safari ❌ Vendor position : unknown
Safari on iOS ❌ Vendor position : unknown

Web Platform Tests (WPT)

View the latest WPT test results for this feature

Developer signals

Votes: 1

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