margin-collapse-clear-013.xht (3399B)
1 <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"> 2 3 <html xmlns="http://www.w3.org/1999/xhtml"> 4 5 <head> 6 7 <title>CSS Test: Margin collapsing with clearance - margins of a 'collapsed through' box with clearance do not collapse with parent block's bottom margin</title> 8 9 <link rel="help" href="http://www.w3.org/TR/CSS21/box.html#collapsing-margins" /> 10 <link rel="help" href="http://www.w3.org/TR/CSS21/visudet.html#normal-block" /> 11 <link rel="bookmark" href="http://lists.w3.org/Archives/Public/public-css-testsuite/2013Oct/0009.html" title="Issue with margin-collapse-clear-012.htm and margin-collapse-clear-013.htm" /> 12 <link rel="author" title="Gérard Talbot" href="http://www.gtalbot.org/BrowserBugsSection/css21testsuite/" /> 13 <link rel="author" title="Bruno Fassino" href="fassino[at]gmail.com" /> 14 <link rel="match" href="margin-collapse-clear-012-ref.xht" /> 15 16 <meta content="When an element has had clearance applied to it and its own margins collapse, these margins do not collapse with the bottom margin of the parent block" name="assert" /> 17 18 <style type="text/css"><![CDATA[ 19 #rel-pos-wrapper {position: relative;} 20 21 #parent-lime 22 { 23 background-color: lime; 24 border-top: black solid 1px; 25 width: 50%; 26 } 27 28 #float-left-blue 29 { 30 background-color: blue; 31 float: left; 32 height: 100px; 33 width: 100px; 34 } 35 36 #clear-left 37 { 38 clear: left; 39 margin-bottom: 140px; 40 margin-top: 40px; 41 } 42 43 #next-yellow 44 { 45 background-color: yellow; 46 height: 100px; 47 } 48 49 .ref-overlapped-red 50 { 51 background-color: red; 52 position: absolute; 53 z-index: -1; 54 } 55 56 #ref1 57 { 58 height: 200px; 59 top: 1px; 60 width: 50%; 61 } 62 63 #ref2 64 { 65 height: 100px; 66 top: 201px; 67 width: 100%; 68 } 69 ]]></style> 70 71 </head> 72 73 <body> 74 75 <p>Test passes if there is <strong>no red</strong>.</p> 76 77 <div id="rel-pos-wrapper"> 78 79 <!-- 80 81 clearance 82 + 83 margin-top of #clear-left (40px) 84 ==================================== 85 height of #float-left-blue (100px) 86 87 therefore, clearance is equal to +60px 88 89 --> 90 91 <!-- 92 93 #parent-lime should have height 200px, sum of: 94 95 100px : height of #float-left-blue 96 + 97 (140px - 40px) : part of #clear-left's margin-bottom 98 exceeding #clear-left's margin-top 99 ======= 100 200px 101 102 The position of the top border edge of the div#clear-left 103 is where it would have been if the element had a 104 non-zero bottom border. The margins of div#clear-left 105 collapse together to 140px and the top border edge of 106 div#clear-left is at 40px inside of it. Clearance is 107 added at such position, not to the whole 140px. 108 109 Issue with margin-collapse-clear-012.htm and margin-collapse-clear-013.htm 110 http://lists.w3.org/Archives/Public/public-css-testsuite/2013Oct/0012.html 111 112 --> 113 114 <div id="parent-lime"> 115 <div id="float-left-blue"></div> 116 <div id="clear-left"></div> 117 </div> 118 119 <!-- 120 #next-yellow should immediately follow #parent-lime (no margins in between) 121 --> 122 123 <div id="next-yellow"></div> 124 125 <!-- 126 #ref1 and #ref2 boxes create a sort of 'reference rendering' 127 where #ref1 should be covered, overlapped by #parent-lime 128 while #ref2 should be covered, overlapped by #next-yellow. 129 --> 130 131 <div id="ref1" class="ref-overlapped-red"></div> 132 <div id="ref2" class="ref-overlapped-red"></div> 133 134 </div> 135 136 </body> 137 </html>