<!DOCTYPE html>
<html>
<body>
<p>Click the button to put the new window in the current window.</p>
<button onclick="myFunction()">Try it</button>
<script>
function myFunction() {
var myWindow = window.open("", "_self");
myWindow.document.write("<p>I replaced the current window.</p>");
}
</script>
</body>
</html>