| <!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: transparency of margin area and background-color</title> |
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| <link rel="author" title="Gérard Talbot" href="http://www.gtalbot.org/BrowserBugsSection/css21testsuite/" /> |
| <link rel="help" href="http://www.w3.org/TR/CSS21/box.html#mpb-examples" title="8.2 Example of margins, padding, and borders" /> |
| <link rel="help" href="http://www.w3.org/TR/CSS21/colors.html#background" title="14.2 The background" /> |
| <link rel="match" href="../reference/ref-filled-green-100px-square.xht" /> |
| |
| <meta content="The margin area of an element is always transparent. The background-color of an element never paints its own margin area. The background-color of an element only paints its own border area (if any), its own padding area (if any) and its own content area (if any). Therefore the background-color of the content area (and of the padding area, if any, and of the border area, if any) of a parent element shines through the margin area of its child. In this test, div#parent is painted green and is 100px by 100px; its sole child has an 99px margin bottom and a 100px margin right margin which are transparent and through which we can see the background color of its parent." name="assert" /> |
| |
| <style type="text/css"><![CDATA[ |
| p {margin: 1em 0em;} |
| |
| div#parent |
| { |
| background-color: green; |
| height: 100px; |
| width: 100px; |
| } |
| |
| div#child |
| { |
| background-color: red; |
| height: 1px; |
| /* |
| 'height: 1px' is set intentionally so that the |
| top margin (16px) and bottom margin (99px) of such child |
| box do not collapse through the element. |
| */ |
| margin: 16px 100px 99px 0px; |
| /* |
| 'margin-top: 16px' correspond to the margin-bottom of the |
| <p>. The margin-top of the child box collapses with the |
| margin-top of div#parent and then the collapsed margin-top |
| of div#parent then collapses in its turn with the |
| margin-bottom of the <p>. |
| */ |
| width: auto; |
| } |
| ]]></style> |
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| </head> |
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| <body> |
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| <p>Test passes if there is a filled green square and <strong>no red</strong>.</p> |
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| <div id="parent"> |
| <div id="child"></div> |
| </div> |
| |
| </body> |
| </html> |
