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CSS ::backdrop 伪元素
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<!DOCTYPE html> <html> <head> <style> button { font-size: 15px; padding: 5px 15px; } dialog::backdrop { background-color: lightgreen; } </style> </head> <body> <h1>Demo of ::backdrop</h1> <p>Click the button to show a dialog:</p> <button id="dialogBtn">Show dialog</button> <dialog id="myDialog"> <form method="dialog"> <p>The background behind this dialog, is a backdrop.</p> <button>Close dialog</button> </form> </dialog> <script> const dialogBtn = document.getElementById('dialogBtn'); const myDialog = document.getElementById('myDialog'); dialogBtn.addEventListener('click', () => myDialog.showModal()); </script> </body> </html>