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+<!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 with a value of 'auto'</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/" /> <!-- 2012-08-13 -->
+ <link rel="help" href="http://www.w3.org/TR/CSS21/box.html#propdef-margin" />
+ <link rel="help" href="http://www.w3.org/TR/CSS21/box.html#margin-properties" />
+ <link rel="match" href="margin-005-ref.xht" />
+
+ <meta name="assert" content="The 'margin' property with a value of 'auto' correctly sizes the margin. In normal flow, 'margin-top: auto' and 'margin-bottom: auto' for block-level, non-replaced elements are resolved as 0. In normal flow, 'margin-left: auto' and 'margin-right: auto' for block-level, non-replaced elements are resolved according to the constraint equation for the width of containing block: 'margin-left' + 'border-left-width' + 'padding-left' + 'width' + 'padding-right' + 'border-right-width' + 'margin-right' = width of containing block" />
+ <style type="text/css">
+ #wrapper
+ {
+ position: relative;
+ }
+ #div1, #div2
+ {
+ border: 10px solid green;
+ }
+ #div1, #reference
+ {
+ left: 0;
+ position: absolute;
+ top: 0;
+ }
+
+ /*
+ In this test, #div1, which is absolutely positioned, is
+ #div2's containing block. In which case, the width of #div1 is
+ shrink-to-fit to the width of #div2 plus its borders.
+ http://www.w3.org/TR/CSS21/visudet.html#abs-non-replaced-width
+ */
+
+ #div2
+ {
+ height: 1in;
+ margin: auto;
+ width: 3in;
+ }
+ #reference
+ {
+ border: 20px solid red;
+ height: 96px;
+ width: 288px;
+ }
+ </style>
+ </head>
+ <body>
+ <p>Test passes if there is <strong>no red</strong>.</p>
+ <div id="wrapper">
+ <div id="reference"></div>
+ <div id="div1">
+ <div id="div2"></div>
+ </div>
+ </div>
+ </body>
+</html>