Html – Nested DIV elements

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I am trying to enclose two DIV elements, inner-1 & inner-2, (dotted red border) inside a wrapper DIV (solid green border) but the wrapper DIV element does not expand to enclose the inner DIVs.

What am I doing wrong?

<!DOCTYPE HTML PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">

<head>
<meta http-equiv="content-type" content="text/html; charset=UTF-8">
<title> Nested divs </title>
</head>

<body>
<div id="wrapper" style="margin-left:auto; margin-right:auto; border:solid #669933;"> 
  content inside "wrapper" div
  <div id="inner-1" style="float:left; width:49%; border:dotted #CC3300;">
    content <br />
    inside <br />
    inner-1 div
  </div>

  <div id="inner-2" style="float:left; width:49%; border:dotted #CC3300;"> 
    content inside inner-2 div 
  </div>
</div>
</body>
</html>

Rendered HTML

Best Solution

Since you're floating both #inner-1 and #inner-2, you'll need a clear fix. Basically, setting overflow: auto on the parent (#wrapper) should do the trick.