<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd"> <html> <head> <title>CSS Test: Block replaced elements and 'auto' specified for 'margin-left', 'margin-right' and percentage intrinsic width</title> <link rel="author" title="Microsoft" href="http://www.microsoft.com/"> <link rel="reviewer" title="Gérard Talbot" href="http://www.gtalbot.org/BrowserBugsSection/css21testsuite/"> <!-- 2012-10-06 --> <link rel="help" href="http://www.w3.org/TR/CSS21/visudet.html#block-replaced-width"> <link rel="match" href="reference/block-replaced-width-006-ref.htm"> <meta name="flags" content="ahem image"> <meta name="assert" content="Percentage intrinsic widths are evaluated against the containing block's width."> <style type="text/css"> #div1 { border: solid black; height: 300px; width: 200px; } img { display: block; margin-left: auto; margin-right: auto; } div div { color: orange; font: 100px/1em Ahem; text-align: center; } </style> </head> <body> <p>Test passes if the blue and orange squares have the <strong>same width</strong> and if they are <strong>horizontally centered</strong> inside an hollow black rectangle.</p> <div id="div1"> <img alt="blue 15x15" src="support/blue15x15.png" width="50%"> <div>X</div> </div> </body> </html>