I think that you've read this article on MDN EventLoop, that is really confusing, not everything what is on MDN is true, this is community Wiki created by volunteers like WIkipedia. It can have mistakes. And this aricle is a proof. I will report this error immediately.
Note that Event Loop MDN article got updated after my intervention on GitHub. There no more concurrency in that article. You can correct your article now.
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I think that you've read this article on MDN EventLoop, that is really confusing, not everything what is on MDN is true, this is community Wiki created by volunteers like WIkipedia. It can have mistakes. And this aricle is a proof. I will report this error immediately.
Note that Event Loop MDN article got updated after my intervention on GitHub. There no more concurrency in that article. You can correct your article now.