[css] how to make a div to wrap two float divs inside?

Here's another, I found helpful. It works even for Responsive CSS design too.

#wrap
{
   display: table;
   table-layout: fixed; /* it'll enable the div to be responsive */
   width: 100%; /* as display table will shrink the div to content-wide */
}

WARNING: But this theory won't work for holder contains inner elements with absolute positions. And it will create problem for fixed-width layout. But for responsive design, it's just excellent. :)

ADDITION TO Meep3D's ANSWER

With CSS3, in a dynamic portion, you can add clear float to the last element by:

#wrap [class*='my-div-class']:last-of-type {
  display: block;
  clear: both;
}

Where your divs are:

<div id="wrap">
<?php for( $i = 0; $i < 3; $i++ ) {
   <div class="my-div-class-<?php echo $i ?>>
      <p>content</p>
   </div> <!-- .my-div-class-<?php echo $i ?> -->
}
</div>

Reference:

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