<!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><meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /> <title>CSS Test: Double lines border style does not change border 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/" /> <!-- 2012-06-26 --> <link rel="help" href="http://www.w3.org/TR/CSS21/box.html#border-style-properties" /> <meta name="flags" content="" /> <meta name="assert" content="The 'double' 'border-style' does not change the size of the border width. The sum of the two lines and the space need to equal the border width." /> <style type="text/css"> div { position: relative; width: 1in; } #test { border-top-style: double; border-top-width: 1in; } #reference { background: blue; height: 1in; left: 1.1in; position: absolute; top: 0; } </style> </head> <body> <p>Test passes if the top edge of the top-most black box is aligned with the top of the blue box and the bottom edge of the bottom-most black box is aligned with the bottom edge of the blue box.</p> <div> <div id="test"></div> <div id="reference"></div> </div> </body> </html>