xxxxxxxxxx<html><head> <meta charset="utf-8"> <title>W3Cschool(w3cschool.cn)</title> </head><head><style>::input-placeholder { /* WebKit, Blink, Edge */ color: #909;}:placeholder { /* Mozilla Firefox 4 to 18 */ color: #909; opacity: 1;}::placeholder { /* Mozilla Firefox 19+ */ color: #909; opacity: 1;}:input-placeholder { /* Internet Explorer 10-11 */ color: #909;}</style></head><body><form action="/statics/demosource/demo-form.php"> <input type="text" name="fname" placeholder="First name"><br> <input type="text" name="lname" placeholder="Last name"><br> <input type="submit" value="提交"></form<p><strong>注意：</strong> Internet Explorer 9及更早IE版本不支持input标签的 placeholder 属性。</p></body></html>