label标签
用于点击文字，使得关联的标签获取光标
fieldset标签
-legend
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>Title</title> </head> <body> <label for="username">用户名：</label> <input id="username" type="text" name="user" /> </body> </html>
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>Title</title> </head> <body> <fieldset> <legend>登录</legend> <label for="username">用户名：</label> <input id="username" type="text" name="user" /> <br /> <label for="pwd">密码：</label> <input id="pwd" type="text" name="pwd" /> </fieldset> </body> </html>