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pseudo.classes.html
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pseudo.classes.html
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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width,initial-scale=1,user-scalable=0">
<meta name="renderer" content="webkit">
<title>css伪类</title>
<meta name="description" content="首页描述"/>
<meta name="keywords" content="首页关键词"/>
<meta name="author" content="Web Layout:amu"/>
<meta name="format-detection" content="telephone=no,date=no,address=no,email=no,url=no"/>
<style>
.list li{color: orange;line-height: 24px;}
.list li:not(.end){color: blue;}
.list li:has(span){color: chartreuse;}
.list li:not(:last-child){
border-bottom: 1px dashed #ccc;
}
input{
height: 24px;
line-height: 24px;
padding: 3px;
}
form p{
position: relative;
}
input:focus{
outline: none;
}
input:valid{
border: 1px solid green;
}
input:invalid{
border: 1px solid red;
}
input::placeholder{
color: darkgoldenrod;
}
input:placeholder-shown{
border: 2px solid sienna;
color: sienna;
}
/*input:not(:placeholder-shown){
border: 2px solid silver;
}*/
.input-url + .input-label{
position: absolute;
color: darkgoldenrod;
pointer-events: none;/*元素经过状态失效*/
left: 5px;
top: 6px;
transform-origin: 0 0;
transition: all .3s;
font-size: 14px;
}
.input-url:placeholder-shown::placeholder{
color: transparent;
}
.input-url:not(:placeholder-shown){
border: 1px dashed violet;
}
.input-url:focus ~ .input-label,
.input-url:not(:placeholder-shown) ~ .input-label{
color: teal;
background: #fff;
transform: scale(0.75) translateY(-20px);
}
</style>
</head>
<body>
<h1>Effect without js</h1>
<h2>css伪类:not()/:has()/:last-child</h2>
<ol class="list">
<li><span>:has()草案，浏览器未实现</span></li>
<li>li:not(.end){color: blue;}</li>
<li class="end"><p class="e">:has(span)</p></li>
<li><p class="e">:has(span)</p></li>
</ol>
<style>
.target p{
position: relative;
display: none;
}
.target p:target{
background: palegoldenrod;
border: 1px dashed #ccc;
padding: 15px;
display: block;
}
.target p:target::before{
position: absolute;
left: 5px;
top: -15px;
content: '';
border-color: transparent transparent palegoldenrod transparent ;
border-width: 8px;
border-style: solid;
}
.centerblock{
position: absolute;
left: 50%;
top: 50%;
background: #fff;
transform: translate(-50%,-50%);
border: 2px solid gray;
padding: 20px;
}
div#open:target{
display: block;
}
.mask-layer{
position: fixed;
left: 0;
top: 0;
width: 100%;
height: 100%;
z-index: 9999;
display: block;
display: none;
background: rgba(0,0,0,.2);
}
</style>
<div class="target">
<h2>:target</h2>
<a href="#text1">第一段</a> |
<a href="#text2">第二段</a> |
<a href="#text3">第三段</a> |
<a href="#open">弹出层</a>
<p id="text1">我是第一段话，一</p>
<p id="text2">我是第二段话，二二</p>
<p id="text3">我是第三段话，三三三</p>
</div>
<div class="mask-layer" id="open">
<div class="centerblock">
<p>你可以不使用任何Javascript代码，只使用:target伪类创建一个加亮框。该技术依赖于初始化时就隐藏在页面中的链接到指定元素的锚。一旦定位，CSS就会更改其display 以便显示它们。</p>
<p style="text-align: right;"><a href="#">关闭</a></p>
</div>
</div>
<h2>表单伪类</h2>
<form action="">
<h4>验证通过:valid</h4>
<p>
<label for=""></label>
<input type="email" value="s@rr.com">
</p>
<h4>验证不通过:invalid</h4>
<p>
<label for=""></label>
<input type="email" value="srrcom">
</p>
<h4>placeholder显示和隐藏:placeholder-shown</h4>
<p>
<input type="datetime" value="" placeholder="请输入">
</p>
<h4>type='url'</h4>
<p>
<input class="input-url" type="text" value="" placeholder="输入连接地址">
<label class="input-label" for="">输入连接地址</label>
</p>
</form>
</body>
</html>