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138 lines
3.4 KiB
HTML
138 lines
3.4 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: Margin collapsing with clearance - margins of a 'collapsed through' box with clearance do not collapse with parent block's bottom margin</title>
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<link rel="help" href="http://www.w3.org/TR/CSS21/box.html#collapsing-margins" />
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<link rel="help" href="http://www.w3.org/TR/CSS21/visudet.html#normal-block" />
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<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" />
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<link rel="author" title="Gérard Talbot" href="http://www.gtalbot.org/BrowserBugsSection/css21testsuite/" />
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<link rel="author" title="Bruno Fassino" href="fassino[at]gmail.com" />
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<link rel="match" href="margin-collapse-clear-012-ref.xht" />
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<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" />
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<meta content="" name="flags" />
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<style type="text/css"><![CDATA[
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#rel-pos-wrapper {position: relative;}
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#parent-lime
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{
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background-color: lime;
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border-top: black solid 1px;
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width: 50%;
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}
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#float-left-blue
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{
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background-color: blue;
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float: left;
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height: 100px;
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width: 100px;
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}
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#clear-left
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{
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clear: left;
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margin-bottom: 140px;
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margin-top: 40px;
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}
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#next-yellow
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{
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background-color: yellow;
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height: 100px;
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}
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.ref-overlapped-red
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{
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background-color: red;
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position: absolute;
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z-index: -1;
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}
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#ref1
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{
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height: 200px;
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top: 1px;
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width: 50%;
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}
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#ref2
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{
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height: 100px;
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top: 201px;
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width: 100%;
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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 there is <strong>no red</strong>.</p>
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<div id="rel-pos-wrapper">
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<!--
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clearance
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+
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margin-top of #clear-left (40px)
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====================================
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height of #float-left-blue (100px)
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therefore, clearance is equal to +60px
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-->
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<!--
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#parent-lime should have height 200px, sum of:
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100px : height of #float-left-blue
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+
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(140px - 40px) : part of #clear-left's margin-bottom
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exceeding #clear-left's margin-top
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=======
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200px
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The position of the top border edge of the div#clear-left
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is where it would have been if the element had a
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non-zero bottom border. The margins of div#clear-left
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collapse together to 140px and the top border edge of
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div#clear-left is at 40px inside of it. Clearance is
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added at such position, not to the whole 140px.
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Issue with margin-collapse-clear-012.htm and margin-collapse-clear-013.htm
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http://lists.w3.org/Archives/Public/public-css-testsuite/2013Oct/0012.html
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-->
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<div id="parent-lime">
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<div id="float-left-blue"></div>
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<div id="clear-left"></div>
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</div>
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<!--
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#next-yellow should immediately follow #parent-lime (no margins in between)
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-->
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<div id="next-yellow"></div>
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<!--
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#ref1 and #ref2 boxes create a sort of 'reference rendering'
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where #ref1 should be covered, overlapped by #parent-lime
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while #ref2 should be covered, overlapped by #next-yellow.
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-->
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<div id="ref1" class="ref-overlapped-red"></div>
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<div id="ref2" class="ref-overlapped-red"></div>
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</div>
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</body>
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</html>
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