heyjiawei / popup-on-leaving-page-demo Goto Github PK

https://www.chromestatus.com/feature/5082396709879808

The beforeunload dialog will only be shown if the frame attempting to display it has received a user gesture or user interaction (or if any embedded frame has received such a gesture). (There will be no change to the dispatch of the beforeunload event, just a change to whether the dialog is shown.)

In this section of HTML whatwg spec: https://html.spec.whatwg.org/multipage/browsing-the-web.html#unloading-documents

The user agent is encouraged to avoid asking the user for confirmation if it judges that doing so would be annoying, deceptive, or pointless. A simple heuristic might be that if the user has not interacted with the document, the user agent would not ask for confirmation before unloading it.