A question about the "leaving page" dialog box in Chrome

Hi,

Whenever I go to leave certain webpages (usually the gambling websites I frequent) I get a conformation dialog box asking if i'm sure I want to leave. Is this normal for Chrome? I figured it works by Javascript, but disabling Javascript is not an option on my sites as it disables site functionality.

So my question is how can I disable this annoying box completely (without disabling Javascript)
Using latest version of Chrome

This is what I am talking about

This is common and not an issue.

This serve as a reminder that you are about to leave that website page.

This most often is in Forum and website that need input.
Once you add your input, it consider as using it.
Hence when you click the cross sign X to close the website page, this prompt you to confirm.

Leave is exit and close the tab.


Edit: No need to turn off Javascript if you need it.