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<!DOCTYPE html> <html> <body> <p>Click the button to show the dialog.</p> <button onclick="myFunction()">Show dialog</button> <p><b>Note:</b> Use the "Esc" button to close the modal.</p> <p><b>Note:</b> The dialog element is only supported in Chrome 37+, Safari 6+ and Opera 24+.</p> <dialog id="myDialog">This is a dialog window</dialog> <script> function myFunction() { document.getElementById("myDialog").showModal(); } </script> </body> </html>