<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd"> <html> <head> <title>CSS Test: Margin collapsing - in-flow block-level margins with an element 'height' of 'auto' and 'max-height' and 'min-height'</title> <link rel="author" title="Microsoft" href="http://www.microsoft.com/"> <link rel="reviewer" title="Gérard Talbot" href="http://www.gtalbot.org/BrowserBugsSection/css21testsuite/"> <!-- 2012-08-15 --> <link rel="help" href="http://www.w3.org/TR/CSS21/box.html#collapsing-margins"> <link rel="match" href="reference/margin-collapse-002-ref.htm"> <meta name="flags" content="ahem image"> <meta name="assert" content="The bottom margin of an in-flow block-level element(#div2) with a 'height' of 'auto' will adjoin to its last in-flow block-level child's (#div3) bottom margin if such auto-height in-flow block-level element has no bottom padding and no bottom border. The bottom margins will then collapse."> <style type="text/css"> div { font: 20px/1em Ahem; width: 5em; } #div1 { background: url('support/margin-collapse-2em-space.png') 0 0; height: 4em; } #div2 { background: red; height: auto; min-height: 0.5em; max-height: 2em; } #div3, #div4 { background: green; height: 1em; } #div2, #div3 { margin-bottom: 2em; } </style> </head> <body> <p>Test passes if there is <strong>no red</strong>.</p> <div id="div1"> <div id="div2"> <div id="div3"></div> </div> <div id="div4"></div> </div> </body> </html>