What is it in the CSS/DOM that prevents an input box with display: block from expanding to the size of its container

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离开以前 2020-11-30 10:29

Sample HTML/CSS:


    
    


div.container


      
      
        
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                   执笔经年
                                             
                
                
                (楼主)
            
              
              
                2020-11-30 10:58
              

            
            
                        
Alright, due to the clarification of the original question...I did some digging and found these laments and this article.

There are a few elements (, </code>) that are considered <strong>replaced elements</strong> whose appearance and dimensions are defined by an external resource. (e.g. the operating system, a plugin, etc)  </p>

<blockquote>
  <p>Replaced elements can have intrinsic
  dimensions—width and height values
  that are defined by the element
  itself, rather than by its
  surroundings in the document. For
  example, if an image element has a
  width set to auto, the width of the
  linked image file will be used.
  Intrinsic dimensions also define an
  intrinsic ratio that’s used to
  determine the computed dimensions of
  the element should only one dimension
  be specified. For example, if only the
  width is specified for an image
  element—at, say, 100px—and the actual
  image is 200 pixels wide and 100
  pixels high, the height of the element
  will be scaled by the same amount, to
  50px.</p>
  
  <p>Replaced elements can also have visual 
  formatting requirements imposed by the 
  element, outside of the control of CSS; 
  for example, the user interface controls 
  rendered for form elements.</p>
</blockquote>

<p>W3C's CSS 2.1 "Visual Formatting Model Details" section discusses the calculation of widths of both replaced and non-replaced elements.</p>

<p>Overall...pretty annoying for some form elements (<code><textarea>, <button>, and <input></code>).  Can/will it change?  Probably not any time soon...Until it does change at the core, we'll have to stick with the hacks :(</p>
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