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The Pseudo-class of CSS

Source: Internet
Author: User
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1.:link add a style to a link that has not been visited: visited adds a style to the link that has been visited: hover adds a style to an element when the mouse hovers over it: AC tive add a style to the active element (clicked) when the above four pseudo-classes are applied to hyperlinks, the order cannot be changed to Hyperlinks: 
<style>a:link{    color:red;    } a:visited{    color:green;    } a:hover{    color:blue;    } a:active{    color:yellow;    } </style>

<a href= "#" >pmx-cnblogs</a>

Div: 
<style>div{    width:100px;    height:100px;    background-color:red;    BORDER:3PX Solid blue;    overflow:hidden;        Transition:width 1s,height 2s,background-color 1s,line-height 2s,font-size 2s;        line-height:100px;    text-align:center;} div:hover{    background-color:green;    width:300px;        height:300px;    line-height:300px;        font-size:2em}div:active{    color:yellow;} </style>

<div>this is div</div>

Normal state:

What to look like when you move the mouse over the Div:

The left mouse button is pressed to look like:

2.:first-child P:first-child selects the P element as the first child element of an element, instead of selecting the first child element of the P element 
<style> #myDiv > p:first-child{   background-color: #3C6;    } </style><body>    <p>p8</p>    <div id= ' mydiv ' style= ' Width:300px;height:300px;o Verflow:auto ' >        <p>p1</p>        <p>p2</p>        <p>p3</p>        <div >            <p>p4</p>            <p>p5</p>        </div>    </div>    <p>p6 </p>    <p>p7</p></body>

P1 is selected as the first child element of a mydiv 3.: Focus adds a special style to the focused element, such as when the button is clicked and the text box enters text 
<style>input:focus{    background-color:yellow;    } </style><input type= ' text ' value= ""/>

4.: Lang adds a style to an element with the specified lang attribute 
<style>:lang (zh) {    color:red;    } </style><p lang= "en" >p7</p>

The Pseudo-class of CSS

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