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<!DOCTYPE html> <html> <head> <style> :popover-open { width: 150px; height: 150px; color: maroon; background-color: orange; font-size: 25px; } #myPopover { transition: opacity .5s ease-in, scale .5s ease-in; @starting-style { opacity: 0; scale: 1.1; } } #myDialog { transition: opacity .5s ease-in, scale .5s ease-in; @starting-style { opacity: 0; scale: 1.1; } } </style> </head> <body> <h1>@starting-style 演示</h1> <button popovertarget="myPopover">显示弹出框</button> <div popover id="myPopover">HELLO!</div> <button id="dialogBtn">显示对话框</button> <dialog id="myDialog"> <form method="dialog"> <p>这是对话框中的一些文本。</p> <button>关闭对话框</button> </form> </dialog> <script> const dialogBtn = document.getElementById('dialogBtn'); const myDialog = document.getElementById('myDialog'); dialogBtn.addEventListener('click', () => myDialog.showModal()); </script> </body> </html>