<!DOCTYPE html>
<html>
<body>
<button onclick="OpenAndAdd()">Open And Add</button>
<script>
function OpenAndAdd() {
var w = window.open();
w.document.open();
w.document.write("<h1>Title</h1>");
w.document.write("<p>Text text text</p>");
w.document.close();
}
</script>
</body>
</html>