If you want your users to see the Existing Web Page and give them a message before doing a Redirect then you must use this in Conjunction with setTimeout() function

Using window.location to Redirect to a Different URL with Apr 20, 2016 How to Redirect Users to Another Page - dummies For example, if you’ve ever come across a page that reads This page has moved. Please wait 10 seconds to be automatically sent to the new location. (or something similar), you’ve seen this trick at work. HTML Basic - W3Schools

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