html - Do divs expand vertically to fit their children divs? -

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I have trouble developing my division vertically with my children

My There is something like: 

  & lt; Div class = 'headerwrapper' & gt; & Lt; Div class = 'header' & gt; & Lt; Img ..... height = 100 & gt; & Lt; / Div & gt; & Lt; / Div & gt;   
 In the firebug, there is a height of 100 in the header divisor, the height of 0 in the header divider divisor.  
 The image is visible in the diu below .. .. There is no definite height on the drawer's diwi.  
 is confused  
 thanks- jonathan   
 
 
 See if you have a header divi set float.  
 When a child element floats and its parents do not, then it gives the reason for falling to the root element of the "0".  
 This is a very good description problem about halfway down the page.

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