Google chrome not displaying alert() popups for one site

I was working on a javascript loop that alerted each key value as the loop progressed.

To speed things along, I checked the box "Prevent this page from creating additional dialogs". Usually this only suppresses popups for the one routine, but they haven't come back.

In Google Chrome, alert() messages no longer pop up from that site. Other sites do, but not that site.

Has anyone heard of this before?

Q: How can I reset the alert() messages for that site?

Why are my chrome Notifications not working?

On Windows, click the Start button and then Settings. In the navigation pane on the left, choose System, then Notifications. At the top of the page, make sure Notifications is on by swiping the button to the right. In the Notifications from apps and other senders section, make sure Google Chrome is turned on as well.

You don't need to restart the browser. Just close the tab and reopen it again. It does not need to be Incognito.