<!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 - in-flow block-level margin adjoining child's margin</title>
        <link rel="author" title="Microsoft" href="http://www.microsoft.com/" />
        <link rel="help" href="http://www.w3.org/TR/CSS21/box.html#collapsing-margins" />
        <link rel="match" href="margin-collapse-024-ref.xht" />

        <meta name="flags" content="ahem image" />
        <meta name="assert" content="When an in-flow block-level element (#div3) is adjoining its in-flow block-level child's top margin and the child has no top border, no top padding or no clearance applied to it, then such top margins collapse." />
        <style type="text/css">
            div
            {
                font: 20px/1em Ahem;
                width: 5em;
            }
            #div1
            {
                background: url('support/margin-collapse-2em-space.png');
                height: 4em;
            }
            #div2, #div4
            {
                background: green;
                height: 1em;
            }
            #div3
            {
                background: red;
            }
            #div3, #div4
            {
                margin-top: 2em;
            }
        </style>
    </head>
    <body>
        <p>Test passes if there is no red.</p>
        <div id="div1">
            <div id="div2"></div>
            <div id="div3">
                <div id="div4"></div>
            </div>
        </div>
    </body>
</html>