requestIdleCallback
external fun requestIdleCallback(callback: IdleRequestCallback, options: IdleRequestOptions? = definedExternally): IdleRequestId(source)
The window.requestIdleCallback() method queues a function to be called during a browser's idle periods. This enables developers to perform background and low priority work on the main thread, without impacting latency-critical events such as animation and input response. Functions are generally called in first-in-first-out order; however, callbacks which have a timeout specified may be called out-of-order if necessary in order to run them before the timeout elapses.