<!DOCTYPE html>
<html>
<body>
<p>Click the button to open the dialog window.</p>
<button onclick="myFunction()">Try it</button>
<p><b>Note:</b> The dialog element is only supported in Chrome 37+, Safari 6+ and Opera 24+.</p>
<dialog id="myDialog">This is an open dialog window</dialog>
<script>
function myFunction() {
var x = document.getElementById("myDialog");
x.open = true;
}
</script>
</body>
</html>