How to invalidate css styles-CSS Tutorial-php.cn

How to invalidate css styles

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Release： 2021-04-29 15:19:49

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Methods to invalidate the css style: 1. By changing the element name to invalidate the css in this area; 2. By setting a high-priority css style to overwrite this css style and make it invalid.

How to invalidate css styles

The operating environment of this tutorial: windows7 system, css3 version, DELL G3 computer.

Methods to invalidate the css style:

1. By changing the element name, we can achieve the purpose of invalidating the css in this area.

As we have already If the above separate style is set for #notice, you can cancel the style by changing the name of the element #notice

<script src="http://libs.baidu.com/jquery/2.0.0/jquery.min.js"></script>
<script type="text/javascript">
$(function() {
    $("#notice").attr("id", "notice00");
});
</script>

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2. Overwrite this css style to make it invalid by setting a high-priority css style

Use !important to increase style priority.

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" 
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
 <html xmlns="http://www.w3.org/1999/xhtml">  
<head>  
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />  
<title>Untitled Document</title>  
<style type="text/css">  
.aa{  
        font-family: Verdana, Arial, Helvetica, sans-serif;  
        font-size: 12px;  
        background-color: #FF0000 !important  
}  
.bb{  
        font-family: Verdana, Arial, Helvetica, sans-serif;  
        font-size: 12px;  
        background-color: #FF0000;  
}  
</style>  
</head>  
<body>  
<div class="aa" style="background-color:#cc6600;font-size:16px;">中Class中包括:!important的样式
</div> <div class="bb" style="background-color:#cc6600">不包括的样式</div>  
</body>  
</html>

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How to invalidate css styles

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