html-css练习题(系统提示)




html-css练习题(系统提示)_第1张图片



代码赏析:

DOCTYPE html >
lang= "en" >
charset= "UTF-8" >
name= "viewport" content= "width=device-width, initial-scale=1.0" >
http-equiv= "X-UA-Compatible" content= "ie=edge" >
</span>Document <span style="color:#800000;">