<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd"> <html> <head> <title>CSS Test: Containing block for static positioned elements is nearest block-level ancestor</title> <link rel="author" title="Microsoft" href="http://www.microsoft.com/"> <link rel="reviewer" title="Gérard Talbot" href="http://www.gtalbot.org/BrowserBugsSection/css21testsuite/"> <!-- 2012-03-07 --> <link rel="help" href="http://www.w3.org/TR/CSS21/visudet.html#containing-block-details"> <link rel="match" href="reference/ref-filled-green-100px-square.htm"> <meta name="flags" content=""> <meta name="assert" content="If the element's position is 'static', the containing block is formed by the content edge of the nearest block-level ancestor box."> <style type="text/css"> #div1 { background: red; display: block; height: 100px; width: 100px; } div div { background: green; height: 100%; position: static; width: 100%; } </style> </head> <body> <p>Test passes if there is a filled green square and <strong>no red</strong>.</p> <div id="div1"> <div></div> </div> </body> </html>