<!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>CSS Test: Margin collapsing is based on used values of 'padding', 'margin' and 'border'</title> <link rel="author" title="Microsoft" href="http://www.microsoft.com/" /> <link rel="reviewer" title="GĂ©rard 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="margin-collapse-002-ref.xht" /> <meta name="flags" content="ahem image" /> <meta name="assert" content="Collapsing of margins is based on the used values of 'padding', 'margin' and 'border'." /> <link rel="stylesheet" type="text/css" href="/fonts/ahem.css" /> <style type="text/css"> div { font: 20px/1em Ahem; width: 5em; } #div3, #div5 { background: green; height: 1em; } #div1 { background: url('support/margin-collapse-2em-space.png'); } #div2 { border: 0 solid red; width: 0; } #div3 { margin-bottom: 2em; } #div4 { border: inherit; margin: 50%; padding: 50%; } #div5 { margin-top: 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 id="div4"> <div id="div5"></div> </div> </div> </div> </body> </html>