html - Why do a div and a table behave differently when given width=100% here? -

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here's code, reduced relevant parts:

<html><head><title></title> <style type="text/css"> body { background-color: #fff; } #titlebar{ border: solid 1px black; margin:10px; }  #bodywrapper{ float: left; width: 100%; }  #bodycolumn{ margin-left: 230px; height:500px; }  #menucolumn{     float: left;     width: 230px;     border: solid 1px black;     margin-left: -100%;     height:500px; }  .bigcontent{ width: 100%; margin:10px; }  .section{     border: 1px solid black;     padding:10px;     overflow: auto; } </style></head><body>  <div id="titlebar">title</div> <div id="bodywrapper"><div id="bodycolumn">  <table class="section bigcontent"><tr><td>first</td></table></table> <div class="section bigcontent">second</div>  </div></div> <div id="menucolumn">menu</div> </body></html>

my problem:

  • the <div> containing "second" wider <table> containing "first" although both siblings , have width=100% via same css class
  • the <div> wider screen, causing scrollbars appear

why , can fix it?

note: seeing same problems in both firefox 3.6 , ie 8

this because of padding. in css, width property applies content box of elements, without padding.

see http://www.w3.org/tr/css21/box.html : width property applies content block in following schema:

so outer element's width 100% of parent's width, plus 10px of left padding , 10px of right padding.

given element block element, should not necessary specify width 100%.

so solutions are:

  • to not set width
  • to take padding account when setting width (here require set padding in %, e.g. 2% of padding , width of 96% (100-2*2)

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