| <!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 - 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" /> |
| <link rel="author" title="Gérard Talbot" href="http://www.gtalbot.org/BrowserBugsSection/css21testsuite/" /> |
| <link rel="author" title="Daniel Schattenkirchner" href="mailto:crazy-daniel@gmx.de" /> |
| <link rel="match" href="margin-collapse-clear-017-ref.xht" /> |
| |
| <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" /> |
| <meta content="image" name="flags" /> |
| |
| <style type="text/css"><![CDATA[ |
| body |
| { |
| background: white url("support/ruler-v-100px-200px-300px.png") no-repeat; |
| margin: 34px 8px 8px 55px; |
| /* |
| 34px : body's top margin collapsing with p's top margin: max(34px, 16px) |
| + 20px : p's 1st line box height |
| + 20px : p's 2nd line box height |
| + 16px : p's bottom margin |
| + 10px : height of topmost green bar |
| ====== |
| 100px |
| */ |
| } |
| |
| p |
| { |
| font-size: 16px; |
| line-height: 20px; |
| margin: 1em 8px; |
| } |
| |
| div#parent-block {margin-bottom: 100px;} |
| |
| div.vertical-gap-separator |
| { |
| background-color: green; |
| height: 10px; |
| } |
| |
| div#element-without-clearance |
| { |
| clear: both; |
| margin-top: 100px; |
| } |
| |
| /* |
| In this test, div#element-without-clearance |
| is what the spec refers to as |
| 'collapsed through' box |
| http://www.w3.org/TR/CSS21/box.html#collapsed-through |
| */ |
| ]]></style> |
| |
| </head> |
| |
| <body> |
| |
| <p>Test passes if there is a vertical gap<br /> |
| of exactly 100px between 2 green bars.</p> |
| |
| <div id="parent-block"> |
| <div class="vertical-gap-separator"></div> |
| <div id="element-without-clearance"></div> |
| </div> |
| |
| <div class="vertical-gap-separator"></div> |
| |
| <!-- |
| div#element-without-clearance's margin-top should collapse |
| with #parent-block's margin-bottom: max(100px, 100px) = 100px |
| --> |
| |
| </body> |
| </html> |
