Experimental: This is an experimental technology
Check the Browser compatibility table carefully before using this in production.
The pauseDuration read-only property of the PerformanceScriptTiming interface returns a DOMHighResTimeStamp indicating the total time, in milliseconds, spent by the script on "pausing" synchronous operations (for example, Window.alert() calls or synchronous XMLHttpRequests).
See Long animation frame timing for examples related to the Long Animation Frames API.