CSS study notes 2_html/css_WEB-ITnose-HTML Tutorial-php.cn

CSS study notes 2_html/css_WEB-ITnose

WBOY

Release： 2016-06-24 11:53:37

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When we browse the website, we will click some links. These links have different effects before and after clicking. These effects are done using pseudo-element selectors

Pseudo element selector:

It is to pre-define some selectors in HTML and become pseudo-elements

format: tag name: pseudo-element: class name tag name.class name: Pseudo element

Hyperlink status:

a :link : Hyperlink unclicked status

a :visited Status after being visited

a :hover Status when the cursor moves to the hyperlink (not clicked) ->Mouseover Stop

a :active Status when clicking a hyperlink

Usage sequence: L - V - H - A, before and after clicking It is a status

It is best to use IE browser to test, some browsers may not see the effect

 <style type="text/css">        /*未访问*/       a:link{            background-color: #06F;  color: #FFF;            text-decoration: none; font-size: 15px;       }        /*鼠标悬停*/        a:hover{             background-color: #FFF; color: #F00;            font-size: 20px;        }        /*点击效果*/        a:active{            background-color: #000; color: #FFF;            font-size: 25px;        }        /*点击后效果*/        a:visited{            background-color: #FF9; color: #000;            text-decoration: line-through;        }    </style>

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The paragraph tag also has the above effect

p:first-line: the first line of text in the paragraph

p:first-letter: the first letter in the paragraph

:focus: element with focus (ps: not supported by IE6, FIrefox, You can see the effect on google)

    <style type="text/css">              div:hover{   /*类似于悬停效果 一样可以加在div上*/            background-color: #F00;            color: #FFF;        }        input :focus{            background-color: #F0F;        }    </style></head><body><hr/><a href="http://www.sina.com.cn" target="_blank">伪元素选择器演示</a><input type="text" /><input type="text" /><hr/>

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Combined application of CSS styles:

css can be used in conjunction with many tags in html

<head lang="en">    <meta charset="UTF-8">    <style type="text/css">    ul{        list-style-type:none;        list-style-image: url(imgs/1.png);    }        table{            border-bottom: #0C0 double 3px;            border-left:#F00 solid 3px;/*solid 实线*/            border-right:#FC0 dashed 3px;/*dashed 虚*/            border-top:#000 groove 3px;            width: 600px;        }        table td{            border: #0CF dotted 2px;            padding: 20px;        }        div{            border: #0F0 dashed 2px;            height: 50px; width: 300px;        }        input{            border: none;            border-bottom: #0CF 1px solid;        }        .Per{            border: none;        }    </style>    <title>asd</title></head><body>        姓名:<input type="text" />        年龄:<input type="text" />        <hr/>        <div> div区域 </div>        <hr/>        <table ><!--html里<table border:.....>,与css结合后,在style设置即可-->            <tr>                <td><input type="text" class="Per"> </td> <td>  单元格二  </td>            </tr>            <tr>                <td>  单元格三  </td> <td>  单元格四  </td>            </tr>        </table>        <hr/>      <ul>          <li>你好</li>          <li>你好</li>          <li>你好</li>          <li>你好</li>      </ul></body>

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