history-replace-with-unload.html

<script>
window.addEventListener("unload", () => {
    console.log("unloading");
});
function replace(){
    var oNewDoc = document.open("", "replace");
    var sMarkup = `
        <title>New Document</title>
        <script>
            window.addEventListener('unload', () => {
                console.log('unloading');
            })
        </` + `script>
        Hello, world
    `;
    oNewDoc.write(sMarkup);
    oNewDoc.close();
}
</script>
<h1>I just want to say</h1><br>
<!--Button will call the replace function and replace the current page with a new one-->
<input type="button" value="Finish Sentence" onclick="replace();">