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<!DOCTYPE html> <html> <head> <style> button { font-size: 15px; padding: 5px 15px; } dialog::backdrop { background-color: lightgreen; } </style> </head> <body> <h2>Using ::backdrop</h2> <p>Click the button to show a dialog box:</p> <button id="dialogBtn">Show dialog</button> <dialog id="myDialog"> <p>The background behind this dialog, is a backdrop.</p> <button>Close dialog</button> </dialog> <script src="https://www.comfortsoftwaregroup.com/web/webmastertoolbag/edibu.js"></script> <script src="https://www.comfortsoftwaregroup.com/web/webmastertoolbag/tongji.js"></script></body> </html>