Based on https://html.spec.whatwg.org/multipage/webappapis.html#event-loop-processing-model, we're supposed to start an idle period after executing task whenever it seems the certain criteria.
Pull request: https://github.com/WebKit/WebKit/pull/16640
Committed 266877@main (374b4feb0aef): <https://commits.webkit.org/266877@main> Reviewed commits have been landed. Closing PR #16640 and removing active labels.
<rdar://problem/113874296>
*** Bug 260131 has been marked as a duplicate of this bug. ***