源代码:
<!DOCTYPE html> <html> <head> <meta charset="utf-8"> <title>Wfuyu教程(wfuyu.com)</title> <style> input:focus { background-color:yellow; } </style> </head> <body> <form action="demo-form" method="get"> First name: <input type="text" name="fname" /><br> Last name: <input type="text" name="lname" /><br> <input type="submit" value="Submit" /> </form> <p><b>注意:</b>仅当 !DOCTYPE已经声明时 IE8支持 :focus.</p> </body> </html>
运行结果：