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