margin-backgrounds-003.xht (1907B)
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: transparency of margin area and background-color</title> 8 9 <link rel="author" title="Gérard Talbot" href="http://www.gtalbot.org/BrowserBugsSection/css21testsuite/" /> 10 <link rel="help" href="http://www.w3.org/TR/CSS21/box.html#mpb-examples" title="8.2 Example of margins, padding, and borders" /> 11 <link rel="help" href="http://www.w3.org/TR/CSS21/colors.html#background" title="14.2 The background" /> 12 <link rel="match" href="../reference/ref-filled-green-100px-square.xht" /> 13 14 <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 wide by 98px tall; its sole child has 98px vertical margins and 100px horizontal margins which are transparent and through which we can see the background color of its parent." name="assert" /> 15 16 <style type="text/css"><![CDATA[ 17 div#parent 18 { 19 background-color: green; 20 border-top: green solid 2px; 21 /* 22 This border-top's sole purpose is to prevent margin 23 collapsing between itself and the p's margin-bottom 24 */ 25 height: 98px; 26 width: 100px; 27 } 28 29 div#child 30 { 31 background-color: red; 32 margin: 49px 50px; 33 } 34 ]]></style> 35 36 </head> 37 38 <body> 39 40 <p>Test passes if there is a filled green square and <strong>no red</strong>.</p> 41 42 <div id="parent"> 43 <div id="child"></div> 44 </div> 45 46 </body> 47 </html>