<!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 and elements with 'overflow' set to 'hidden'</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/" /> <!-- 2012-08-14 --> <link rel="help" href="http://www.w3.org/TR/CSS21/box.html#collapsing-margins" /> <link rel="match" href="../reference/ref-if-there-is-no-red.xht" /> <meta name="flags" content="ahem" /> <meta name="assert" content="Elements with 'overflow' set to 'hidden' do not collapse margin with in-flow children." /> <link rel="stylesheet" type="text/css" href="/fonts/ahem.css" /> <style type="text/css"> div { font: 20px/1em Ahem; height: 5em; width: 5em; } #div1 { height: 2em; margin-top: 2em; overflow: hidden; } #div2 { height: 1em; background: red; margin-top: 2em; } </style> </head> <body> <p>Test passes if there is <strong>no red</strong>.</p> <div> <div id="div1"> <div id="div2"></div> </div> </div> </body> </html>