CSS study notes 2_html/css_WEB-ITnose
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>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/>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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