What does this debug information mean?
When I preview the page, the code works as expected
It is nothing to worry about you can safely ignore it.
But since you sound curious…when you create the static event handler using the properties panel, a function is created with a parameter passed to it. The reason the parameter is included is because it contains information that you might want to use in your event handler. Since you are not using the information in the parameter, you see that warning message. If you want, you can delete the parameter (the word “event”) and the warning will go away.
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