<html><head><style>input:read-write { background-color: beige; border: 2px solid maroon;}</style></head><body><h1>:read-write 演示</h1><p>:read-write 选择器选择没有 "readonly" 属性的表单元素：</p><form><label for="name">姓名：</label><br><input id="name" name="name" type="text" /><br><label for="email">邮箱：</label><br><input id="email" name="email" type="email" /><br><label for="country">国家：</label><br><input id="country" name="country" type="text" value="中国" readonly /></form></body></html>