Why aren't min-width and max-width working as I expect?

Posted by Nathan Long on Stack Overflow See other posts from Stack Overflow or by Nathan Long
Published on 2010-05-14T20:43:31Z Indexed on 2010/05/14 20:54 UTC
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I'm trying to adjust a CSS page layout using min-width and max-width. To simplify the problem, I made this test page. I'm trying it out in the latest versions of Firefox and Chrome with the same results.

<!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>
    <title>Testing min-width and max-width</title>
    <style type="text/css">
       div{float: left; max-width: 400px; min-width: 200px;}
       div.a{background: orange;}
       div.b{background: gray;}
    </style>
  </head>
  <body>
    <div class="a">
      (Giant block of filler text here)
    </div>
    <div class="b">
      (Giant block of filler text here)
    </div>
  </body>
</html>

Here's what I expect to happen:

  • With the browser maximized, the divs sit side by side, each 400px wide: their maximum width
  • Shrink the browser window, and they both shrink to 200px: their minimum width
  • Further shrinking the browser has no effect on them

Here's what actually happens, starting at step 2:

  • Shrink the browser window, and as soon as they can't sit side-by-side at their max width, the second div drops below the first
  • Further shrinking the browser makes them get narrower and narrower, as small as I can make the window

So here's are my questions:

  • What does max-width mean if the element will sooner hop down in the layout than go lower than its maximum width?
  • What does min-width mean if the element will happily get narrower than that if the browser window keeps shrinking?
  • Is there any way to achieve what I want: have these elements sit side-by-side, happily shrinking until they reach 200px each, and only then adjust the layout so that the second one drops down?

And of course...

What am I doing wrong?

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