<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
<link rel="stylesheet" href="css/zuoye.css">
</head>
<body>
<ul id="listone">
<li>1-item</li>
<li>2-item</li>
<li>3-item</li>
<li>4-item</li>
<li>5-item</li>
<li>6-item</li>
<li>7-item</li>
<li>8-item</li>
<li>9-item</li>
</ul>
<form action="" class="biaodan">
<fieldset>
<legend>用户注册</legend>
<label>用户名 :
<input type="text" name="name"/>
</label>
<br>
<label class="tip">温馨提醒 :
<input type="text" disabled name="name" value="用户名不能为空,并且为中文"/>
</label>
<br/>
<div class="xingbie">
<label for="box">性别:</label>
<input type="radio" name="sex" id="box" value="0" checked /><label for="box">男</label>
<input type="radio" name="sex" id="girl" value="1" /><label for="girl">女</label>
</div>
<button>提交</button>
</fieldset>
</form>
</body>
</html>
<!--zuoye.css-->
/* 结构伪类 */
/* 获取第一个元素 */
#listone>li:nth-of-type(1){
background-color: chocolate;
}
/*获取2和5元素*/
#listone>li:nth-of-type(-3n+5){
background-color: aqua;
}
/*获取最后3个元素*/
#listone>li:nth-last-of-type(-n+3){
background-color: yellow;
}
/* 状态伪类 */
input:disabled,.tip{
color: red;
border: none;
outline: none;
width: 100%;
}
input:checked+label{
color: red;
}
button,button:hover{
border: none;
outline: none;
}
button{
background-color: darkgreen;
color: white;
}
button:hover{
color: red;
}
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>盒模型</title>
</head>
<body>
<div class="box"></div>
<p>宽度尺寸计算:padding-left-width+padding-right-width+border-left-width+border-right-width+width</p>
<p>宽度总尺寸332px</p>
<p>高度尺寸计算:padding-top-height+padding-botton-width+border--top-height+border-botton-width+height</p>
<p>高度总尺寸332px</p>
<style>
.box{
width: 300px;
background-color: yellowgreen;
border: 1px solid;
height: 300px;
padding: 15px;
margin: 15px;
}
</style>
</body>
</html>
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