95 lines
2.4 KiB
HTML
95 lines
2.4 KiB
HTML
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
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<html xmlns="http://www.w3.org/1999/xhtml">
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<head>
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<title>CSS Test: Absolutely positioned, non-replaced elements, 'margin-top' and 'margin-bottom' set to '0'</title>
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<link rel="author" title="Microsoft" href="http://www.microsoft.com/" />
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<link rel="reviewer" title="Gérard Talbot" href="http://www.gtalbot.org/BrowserBugsSection/css21testsuite/" /> <!-- 2012-08-31 -->
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<link rel="help" href="http://www.w3.org/TR/CSS21/visudet.html#abs-non-replaced-height" />
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<link rel="match" href="absolute-non-replaced-height-003-ref.xht" />
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<meta name="assert" content="The 'auto' values for 'margin-top' and 'margin-bottom' are set to '0', when 'top' is 'auto' and 'height' and 'bottom' are not 'auto'." />
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<style type="text/css">
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#div1
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{
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border: solid black;
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height: 3in;
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position: relative;
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width: 3in;
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}
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div div
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{
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background: blue;
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bottom: 1in;
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height: 1in;
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margin-bottom: auto;
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margin-top: auto;
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position: absolute;
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top: auto;
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width: 100%;
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}
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/*
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auto (to solve) : top
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+
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auto (to solve): margin-top
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+
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0 : border-top-width
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+
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0 : padding-top
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+
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1in : height
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+
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0 : padding-bottom
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+
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0 : border-bottom-width
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+
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auto (to solve): margin-bottom
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+
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1in : bottom
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=============
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3in : height of containing block
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"
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'top' is 'auto', 'height' and 'bottom' are not 'auto',
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then set 'auto' values for 'margin-top' and 'margin-bottom' to 0,
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and solve for 'top'
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"
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so this brings:
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auto (to solve) : top
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+
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0 (set): margin-top
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0 : border-top-width
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+
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0 : padding-top
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+
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1in : height
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+
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0 : padding-bottom
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+
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0 : border-bottom-width
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+
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0 (set): margin-bottom
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+
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1in : bottom
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=============
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3in : height of containing block
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So, top must use 1in in order to balance the equation
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*/
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</style>
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</head>
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<body>
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<p>Test passes if a blue rectangle is <strong>vertically centered</strong> in an hollow black square.</p>
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<div id="div1">
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<div></div>
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</div>
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</body>
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</html>
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