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<html><body><h1>The HTML Dialog Object</h1><h2>The open Property</h2><p>Click the button to find out if the dialog window is open.</p><button onclick="myFunction()">Try it</button><dialog id="myDialog" open>This is an open dialog window</dialog><p id="demo"></p><script>function myFunction() { let x = document.getElementById("myDialog").open; document.getElementById("demo").innerHTML = x;}</script></body></html>