absolute-non-replaced-max-height-010.xht (2645B)
1 <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"> 2 <html xmlns="http://www.w3.org/1999/xhtml"> 3 <head> 4 <title>CSS Test: Max-height on absolutely positioned, non-replaced elements, 'margin-top' and 'margin-bottom' set to '0'</title> 5 <link rel="author" title="Microsoft" href="http://www.microsoft.com/" /> 6 <link rel="reviewer" title="Gérard Talbot" href="http://www.gtalbot.org/BrowserBugsSection/css21testsuite/" /> <!-- 2012-08-31 --> 7 <link rel="help" href="http://www.w3.org/TR/CSS21/visudet.html#abs-non-replaced-height" /> 8 <link rel="match" href="absolute-non-replaced-height-003-ref.xht" /> 9 10 <meta name="assert" content="When 'top' and 'height' are 'auto' and 'bottom' is not 'auto', then the height is based on the content (and such height can be constrained by a max-height declaration) and then set 'auto' values for 'margin-top' and 'margin-bottom' to 0, and solve for 'top' " /> 11 <style type="text/css"> 12 #div1 13 { 14 border: solid black; 15 height: 3in; 16 position: relative; 17 width: 3in; 18 } 19 div div 20 { 21 background: blue; 22 bottom: 1in; 23 height: 2in; 24 margin-bottom: auto; 25 margin-top: auto; 26 max-height: 1in; 27 position: absolute; 28 top: auto; 29 width: 100%; 30 } 31 32 /* 33 34 auto (to solve) : top 35 + 36 auto (to solve): margin-top 37 + 38 0 : border-top-width 39 + 40 0 : padding-top 41 + 42 2in : height (will be constrained to use 1in by max-height) 43 + 44 0 : padding-bottom 45 + 46 0 : border-bottom-width 47 + 48 auto (to solve): margin-bottom 49 + 50 1in : bottom 51 ============= 52 3in : height of containing block 53 54 55 " 56 'top' is 'auto', 'height' and 'bottom' are not 'auto', 57 then set 'auto' values for 'margin-top' and 'margin-bottom' to 0, 58 and solve for 'top' 59 " 60 61 so this brings: 62 63 auto (to solve) : top 64 + 65 0 (set): margin-top 66 + 67 0 : border-top-width 68 + 69 0 : padding-top 70 + 71 1in (constrained) : height 72 + 73 0 : padding-bottom 74 + 75 0 : border-bottom-width 76 + 77 0 (set): margin-bottom 78 + 79 1in : bottom 80 ============= 81 3in : height of containing block 82 83 So, top must use 1in in order to balance the equation 84 85 */ 86 </style> 87 </head> 88 <body> 89 <p>Test passes if a blue rectangle is <strong>vertically centered</strong> in an hollow black square.</p> 90 <div id="div1"> 91 <div></div> 92 </div> 93 </body> 94 </html>