题

!DOCTYPE html
html
head
meta charset="utf-8" /
title</title
link rel="stylesheet" type="text/css" href="css/style.css"/
/head
body
h1 align="center">hello</h1
h2 style="color: orange;">world</h2
p style="color: red;">my name is</p
a href="#" target="_blank">超级链接</a
/body
/html
子页
body{
background-color:blue ;

}
a[target="_blank"]{
color: red;
}
h1[align]{
color:orange;

}