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<!DOCTYPE html>
<html>
<body>
<p>Click the button to find out if the dialog window is open.</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>
<p id="demo"></p>
<dialog id="myDialog" open>This is an open dialog window</dialog>
<script>
function myFunction() {
  var x = document.getElementById("myDialog").open;
  document.getElementById("demo").innerHTML = x;
}
</script>
</body>
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</html>