乡下人产国偷v产偷v自拍,国产午夜片在线观看,婷婷成人亚洲综合国产麻豆,久久综合给合久久狠狠狠9

    • <output id="e9wm2"></output>
    <s id="e9wm2"><nobr id="e9wm2"><ins id="e9wm2"></ins></nobr></s> 
    

    • 
    
    
      



    
      
        
      
            
        
      
        
      
    
      
    
      
        
      
        
      
            
            
      
                
      
                    
                
      
                搜索
            
      

            分享
                
            

            
            
            
            
            
            
            
            

            
        
      
    
      
    
      

    
      

    
      
        
      
        
      
        
      
        
      
            
      
                
      
                    
      CSS How To...
      
                    
                    
                    
                    
      
                         liu_jinbo
                        
                        
                        2007-04-04
                        
                            
                        
                    
      
                    
      
                        
                        
      
                    
      
                    
                    
      
                        
      
                            
                        
      
                        
      
                            
                                
      
                                    
                                        
      

                                        
                                        

                                        
      

      CSS How To...
      
Previous Next

      

      Examples
      


      

      How to Insert a Style Sheet
      

      When a browser reads a style sheet, it will format the document according to it. There are three ways of inserting a style sheet: 
      

      External Style Sheet
      

      An external style sheet is ideal when the style is applied to many pages. With an external style sheet, you can change the look of an entire Web site by changing one file. Each page must link to the style sheet using the <link> tag. The <link> tag goes inside the head section: 
      

      
    
        
      
            
            
      <head>
            <link rel="stylesheet" type="text/css"
            href="mystyle.css" />
            </head>
      
                  		
        
      
          

      

      The browser will read the style definitions from the file mystyle.css, and format the document according to it. 
      

      An external style sheet can be written in any text editor. The file should not contain any html tags. Your style sheet should be saved with a .css extension. An example of a style sheet file is shown below: 
      

      
    
        
      
            
            
      hr {color: sienna}
            p {margin-left: 20px}
            body {background-image: url("images/back40.gif")}
      
                  		
        
      
          

      

      

      
    
        
      
            
            
      Remark Do NOT leave spaces between the property value and the units! If you use "margin-left: 20 px" instead of "margin-left: 20px" it will only work properly in IE6 but it will not work in Mozilla/Firefox or Netscape.
      
                  		
        
      
          

      

      Internal Style Sheet
      

      An internal style sheet should be used when a single document has a unique style. You define internal styles in the head section by using the <style> tag, like this: 
      

      
    
        
      
            
            
      <head>
            <style type="text/css">
            hr {color: sienna}
            p {margin-left: 20px}
            body {background-image: url("images/back40.gif")}
            </style>
            </head>
      
                  		
        
      
          

      

      The browser will now read the style definitions, and format the document according to it. 
      

      Note: A browser normally ignores unknown tags. This means that an old browser that does not support styles, will ignore the <style> tag, but the content of the <style> tag will be displayed on the page. It is possible to prevent an old browser from displaying the content by hiding it in the HTML comment element:  
      

      
    
        
      
            
            
      <head>
            <style type="text/css">
            <!--
            hr {color: sienna}
            p {margin-left: 20px}
            body {background-image: url("images/back40.gif")}
            -->
            </style>
            </head>
      
                  		
        
      
          

      

      Inline Styles
      

      An inline style loses many of the advantages of style sheets by mixing content with presentation. Use this method sparingly, such as when a style is to be applied to a single occurrence of an element. 
      

      To use inline styles you use the style attribute in the relevant tag. The style attribute can contain any CSS property. The example shows how to change the color and the left margin of a paragraph: 
      

      
    
        
      
            
            
      <p style="color: sienna; margin-left: 20px">
            This is a paragraph
            </p>
      
                  		
        
      
          

      

      

      

      Multiple Style Sheets
      

      If some properties have been set for the same selector in different style sheets, the values will be inherited from the more specific style sheet. 
      

      For example, an external style sheet has these properties for the h3 selector:
      

      
    
        
      
            
            
      h3
            {
            color: red;
            text-align: left;
            font-size: 8pt
            }
      
                  		
        
      
          

      

      And an internal style sheet has these properties for the h3 selector:
      

      
    
        
      
            
            
      h3
            {
            text-align: right;
            font-size: 20pt
            }
      
                  		
        
      
          

      

      If the page with the internal style sheet also links to the external style sheet the properties for h3 will be:
      

      
    
        
      
            
            
      color: red;
            text-align: right;
            font-size: 20pt
      
                  		
        
      
          

      

      The color is inherited from the external style sheet and the text-alignment and the font-size is replaced by the internal style sheet.
      

      
Previous Next 
      
                                          		
                                
      
                                  
                        
      
                    
      



                
      
                
      
                    
                    
                        
      
                            
                                
        
                                    		
                        
        
                            
                
        
                
        
                
                
                
        
                
        


                

                
        本站是提供個人知識管理的網(wǎng)絡(luò)存儲空間，所有內(nèi)容均由用戶發(fā)布，不代表本站觀點。請注意甄別內(nèi)容中的聯(lián)系方式、誘導(dǎo)購買等信息，謹(jǐn)防詐騙。如發(fā)現(xiàn)有害或侵權(quán)內(nèi)容，請點擊一鍵舉報。
        
                
                

                
        
                    轉(zhuǎn)藏
                    
                    
                    
                    
                    
                    
                        分享
                        
                        
                    
                    獻花（0）
                            
                
        
                
                
                
        
                    
        
                        
                        
                    
        
                
        

            
        

            
        

            
        
                
                
                
        
                
        
                    
        
                        
        0條評論
        
                        
                        
                        
        
                            
                            
        
                                發(fā)表
                            
        
                        
        
                        
                    
        
                    
                    
        請遵守用戶 評論公約
        
                    
                    
          
                    
        
                    
        
                    
        
                    
                
        
               
                
        
                    
        
                        類似文章
                        更多