PerformanceLongAnimationFrameTiming: firstUIEventTimestamp property

Limited availability

This feature is not Baseline because it does not work in some of the most widely-used browsers.

Experimental: This is an experimental technology
Check the Browser compatibility table carefully before using this in production.

The firstUIEventTimestamp read-only property of the PerformanceLongAnimationFrameTiming interface returns a DOMHighResTimeStamp indicating the time of the first UI event — such as a mouse or keyboard event — to be processed during the current animation frame. Note this timestamp can be before the start of this animation frame if there was a delay between the event happening and it being processed.