How can the pseudo element detect the height of the non-pseudo element?

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 1  1993

Please see http://jsfiddle.net/ZWw3Z/

Text text text text text text text...

p {
    background-color: blue;
}

p:b


                      
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                  无人共我        
                
              
                            
                2021-02-18 22:17
              
            
            
                                                                       
To future readers, the effect was to have a bar appear over text on the left-hand side. To accomplish this, the OP was using position: absolute; on the psuedo element (p:before).

The error OP was encountering was because the psuedo-element was treating the <body> as it's relative position point - to fix, simply set position: relative; on the <p> tag.



p {
  position: relative;
  background-color: blue;
  padding-left: 10px;
  /* change the padding to something larger 
  than the width of the :before element to 
  add spacing for text
  */
}

p:before {
  content: '';
  position: absolute;
  left: 0;
  top: 0;
  width: 10px;
  height: 100%;
  background-color: red;
}
<p>text... text...</p>



                                                                        
                                                        
            
            
              
                
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