<!DOCTYPE html>
<html>
<body>
<p>Click the button to open a new window and add some content.</p>
<button onclick="myFunction()">Try it</button>
<script>
function myFunction() {
var w = window.open();
w.document.open();
w.document.write("<h1>Hello World!</h1>");
w.document.close();
}
</script>
</body>
</html>