Experimental: This is an experimental technology
Check the Browser compatibility table carefully before using this in production.
The forcedStyleAndLayoutDuration read-only property of the PerformanceScriptTiming interface returns a DOMHighResTimeStamp indicating the total time spent, in milliseconds, by the script processing forced layout/style. See Avoid layout thrashing to understand what causes this.
See Long animation frame timing for examples related to the Long Animation Frames API.