How do you wrap one text div around another that follows a brother in the DOM?
Suppose I have this HTML:
<div id="a"> a aa aaa a aa aaa a aa aaa a aa aaa a aa aaa a aa aaa a aa aaa a aa aaa a aa aaa a aa aaa a aa aaa a aa aaa a aa aaa a aa aaa a aa aaa a aa aaa a aa aaa a aa aaa a aa aaa a aa aaa a aa aaa </div> <div id="b"> b bb bbb b bb bbb b bb bbb b bb bbb b bb bbb b bb bbb </div> Using CSS, how can I wrap div A around div B to get this effect below?

Of everything that I tried, and everything that I read, Iβm not even sure that this is possible. Negative margin floats simply overlap instead of wrapping, and any attempt at absolute positioning will result in div B getting out of the stream, and therefore there will be no wrapping.
I want div A to follow div B like a brother, so that the content is displayed simply on mobile phones or for reading from the screen. This is why div B is not a child of div A.
Without resorting to moving div B with JavaScript, is there any CSS way that can achieve the effect. The only thing I can think of is to put an empty div in the div div from div A, and then move div B to the βtopβ. Is this the right technique, or am I just asking about problems in viewports of different sizes?
It seems that everyone agrees that this kind of thing cannot be done with CSS alone. So, I hacked a short (far-fetched) solution using jQuery if anyone else helped. You can also see the results at http://jsfiddle.net/qadJB/
<!DOCTYPE html> <html> <body> <div id="a"> a aa aaa a aa aaa a aa aaa a aa aaa a aa aaa a aa aaa a aa aaa <div id="b-box"></div> a aa aaa a aa aaa a aa aaa a aa aaa a aa aaa a aa aaa a aa aaa a aa aaa a aa aaa a aa aaa a aa aaa a aa aaa a aa aaa a aa aaa </div> <div id="b"> b bb bbb b bb bbb b bb bbb b bb bbb b bb bbb b bb bbb </div> <style> div { font-family: consolas; } #a { margin-left: 5em; width: 18em; } #b-box { border: 1px solid #eee; float: left; height: 3.25em; width: 10em; margin: 0.5em; margin-left: -4em; } </style> <script src="//code.jquery.com/jquery-1.9.1.min.js"></script> <script> $(function() { var boxPos = $('#b-box').offset(); $('#b') .css('position', 'absolute') .width($('#b-box').width()) .css('top', boxPos.top + 'px') .css('left', boxPos.left + 'px'); }); </script> </body> </html> EDIT: To keep things simple, I skipped the code to hide the Box-B div and didn't move the div B for small screens. I would use a CSS media query to hide the B-Box div, and when it's hidden, jQuery code won't do anything with div B.