w3school TIY
编辑您的代码：
<!DOCTYPE HTML> <html> <body> <form action="http://www.jb51.net/example/html5/demo_form.asp" method="get"> Name: <input type="text" name="usr_name" required="required" /> <input type="submit" value="提交" /> </form> </body> </html>
查看结果: