81 lines
2.3 KiB
HTML
81 lines
2.3 KiB
HTML
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
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<html>
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<head>
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<title>CSS Test: Margin collapsing - margins of a 'collapsed through' box without clearance can 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="author" title="Gérard Talbot" href="http://www.gtalbot.org/BrowserBugsSection/css21testsuite/">
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<link rel="author" title="Daniel Schattenkirchner" href="crazy-daniel{at}gmx.de">
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<link rel="match" href="margin-collapse-clear-017-ref.htm">
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<meta content="An element that does not have clearance applied to it can collapse its top margin with its parent block's bottom margin. Margins of a 'collapsed through' box without clearance applied to it can collapse with its parent block's bottom margin. An element with 'clear' set to a value other than 'none' can create a clearance only if and only when there is an earlier (in the source document) floating box." name="assert">
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<meta content="image" name="flags">
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<style type="text/css">
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body
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{
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background: white url("support/ruler-v-100px-200px-300px.png") no-repeat;
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margin: 34px 8px 8px 55px;
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/*
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34px : body's top margin collapsing with p's top margin: max(34px, 16px)
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+ 20px : p's 1st line box height
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+ 20px : p's 2nd line box height
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+ 16px : p's bottom margin
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+ 10px : height of topmost green bar
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======
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100px
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*/
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}
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p
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{
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font-size: 16px;
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line-height: 20px;
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margin: 1em 8px;
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}
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div#parent-block {margin-bottom: 100px;}
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div.vertical-gap-separator
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{
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background-color: green;
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height: 10px;
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}
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div#element-without-clearance
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{
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clear: both;
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margin-top: 100px;
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}
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/*
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In this test, div#element-without-clearance
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is what the spec refers to as
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'collapsed through' box
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http://www.w3.org/TR/CSS21/box.html#collapsed-through
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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 a vertical gap<br>
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of exactly 100px between 2 green bars.</p>
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<div id="parent-block">
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<div class="vertical-gap-separator"></div>
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<div id="element-without-clearance"></div>
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</div>
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<div class="vertical-gap-separator"></div>
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<!--
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div#element-without-clearance's margin-top should collapse
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with #parent-block's margin-bottom: max(100px, 100px) = 100px
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-->
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</body>
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</html> |