Detailed introduction to CSS style weights

InLine style(InLine style)>Internal style sheet(Internal style sheet)>External style sheet(External style sheet)
Exception:But if the external style sheet is placed inside The style sheet is quoted below, then the external style sheet > internal style sheet;
1, the weight of the inline style sheet is 1000;
2, the weight of the ID selector is 100;
3, the Class class The weight of the selector is 10;
4, and the weight of the HTML tag selector is 1;
The specific code is as follows:

nbsp;html>  
      
      
        <meta>  
        <title>CSS样式权值</title>  
        <style>  
            body{   
                font-size: 20px;   
                font-weight: 900;    
            }   
            h3{   
                color: yellow;   
            }   
            #redP p{   
                /*权值100+1=101*/   
                color: #f00;   
                /*红色*/   
            }   
            #redP p.red em{   
                /*权值100+1+10+1=112*/   
                color: #00f;   
                /*蓝色*/   
            }   
            #redP .red em{   
                /*权值100+10+1=111*/   
                color: #0ff;   
                /*亮蓝色*/   
            }   
      
      
            #redP p span em{   
                /*权值100+1+1+1=103*/   
                color: #ff0;   
                /*黄色*/   
            }   
        </style>  
        <link>  
      
      
        <h3 id="例外-外部样式表-gt-内部样式表">例外:外部样式表>内部样式表</h3>  
        <p>  
            </p><p>  
                <span>  
                    <em>emred</em>  
                </span>  
            </p>  
            <p>red</p>  
          
      
    

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