third_party/WebKit/LayoutTests/css2.1/20110323/absolute-non-replaced-width-004.htm

   1 <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
   2 <html>
   3     <head>
   4         <title>CSS Test: Absolutely positioned non-replaced elements when both 'margin-left' and 'margin-right' are set to 'auto' and direction is left-to-right</title>
   5         <link rel="author" title="Microsoft" href="http://www.microsoft.com/">
   6         <link rel="help" href="http://www.w3.org/TR/CSS21/visudet.html#abs-non-replaced-width">
   7         <meta name="flags" content="ahem">
   8         <script src="../../resources/ahem.js"></script>
   9         <meta name="assert" content="When direction is 'ltr' and 'left', 'width' and 'right' are not 'auto', solve for 'margin-right' and 'margin-left' to equal values. If this would make 'margin-left' and 'margin-right' negative, then set 'margin-left' to zero and solve for 'margin-right'.">
  10         <style type="text/css">
  11             #div1
  12             {
  13                 border: solid black;
  14                 direction: ltr;
  15                 height: 2in;
  16                 position: relative;
  17                 width: 2in;
  18             }
  19             div div
  20             {
  21                 background: red;
  22                 color: blue;
  23                 font: 1in/1em Ahem;
  24                 left: 1in;
  25                 margin-left: auto;
  26                 margin-right: auto;
  27                 position: absolute;
  28                 right: 1in;
  29                 width: 1in;
  30             }
  31             /*
  32                 left                    :   1in
  33               + margin-left             :   solve (auto)
  34               + border-left-width       :   0
  35               + padding-left            :   0
  36               + width                   :   1in
  37               + padding-right           :   0
  38               + border-right-width      :   0
  39               + margin-right            :   solve (auto)
  40               + right                   :   1in
  41               ====================================
  42               width of containing block :   2in
  43
  44             So, margin-left and margin-right would be each -0.5in at this point.
  45
  46             "...unless this would make them (the two margins) negative in which case when direction of the containing block is 'ltr' ('rtl'), set 'margin-left' ('margin-right') to zero and solve for 'margin-right' ('margin-left')."
  47
  48             So, under such extra constraint, 'margin-left' must become 0 and 'margin-right' must become -1in.
  49             */
  50         </style>
  51     </head>
  52     <body>
  53         <p>Test passes if the blue box fills the upper-right corner of the black box and there is no red visible on the page.</p>
  54         <div id="div1">
  55             <div>X</div>
  56         </div>
  57     </body>
  58 </html>