Hi all, I'm starting the effort to implement requestIdleCallback  in WebKit in https://bugs.webkit.org/show_bug.cgi?id=164193. It's an API for executing scripts when the browser is idle. It's supported by both Gecko & Blink as well as the old Edge engine.
Because we don't plan on implementing any sort of scheduler or the literal event loop in WebKit, the major part of this effort involves identifying task sources  that interact with the idleness as discussed in https://github.com/w3c/requestidlecallback/issues/71, and contributing to more explicitly define what "idle" means in the cooperative scheduling specification itself. This would entail studying the use thereof and refactoring of Timer, GenericTaskQueue, GenericEventQueue, etc... in order to track origins of tasks and determining the quality of service of each task; e.g. whether a given task is considered as a task that should delay requestIdleCallback if it's author observable, and if not, then its relative priority with requestIdleCallback.  Spec: https://w3c.github.io/requestidlecallback/  https://html.spec.whatwg.org/multipage/webappapis.html#generic-task-sources - R. Niwa
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