'How can I recreate the javascript alert box in HTML so it does not display "The page at blahblah says"

So I have a piece of code that displays an alert box when opened in your browser. See below. However, when opened, it says... The page at whateverwebsite.com says: - at the top.

How can I recreate it in HTML so it's exactly like the browsers default alert box?

Please help!

<script> function myFunction() { alert("Alert here"); } </script>


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