<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">

<html>

 <head>

  <meta http-equiv="content-type" content="text/html; charset=UTF-8">

  <title>Embedded HTML document for abs-pos-non-replaced-icb-vrl-030 in 'writing-mode: vertical-rl'</title>

  <!--
  position absolute and 'vertical-rl' - overconstrained values with 'direction: ltr' in initial containing block
  -->

  <style type="text/css">
  html
    {
      direction: ltr;
    }

  div
    {
      background-color: green;
      border-left: green none 0px;
      border-right: green none 0px;
      height: 100px;
      left: 60%;
      margin-left: 0px;
      margin-right: 0px;
      position: absolute;
      right: 40%;
      top: 0px;
      width: 20%;
      writing-mode: vertical-rl;
    }

  /*
  "
  If the values are over-constrained, ignore the value for 'left' (in case the 'direction' property of the containing block is 'rtl') or 'right' (in case 'direction' is 'ltr') and solve for that value.
  "
  10.3.7 Absolutely positioned, non-replaced elements
  http://www.w3.org/TR/CSS21/visudet.html#abs-non-replaced-width

  So:

             60% : left
         +
             0px : margin-left
         +
             0px : border-left-width
         +
             0px : padding-left
         +
             20% : width
         +
             0px : padding-right
         +
             0px : border-right-width
         +
             0px : margin-right
         +
             40% : right
         ====================
           500px : width of containing block (width of Initial Containing Block)

  becomes

           300px : left (60% of 500px)
         +
             0px : margin-left
         +
             0px : border-left-width
         +
             0px : padding-left
         +
           100px : width (20% of 500px == 100px)
         +
             0px : padding-right
         +
             0px : border-right-width
         +
             0px : margin-right
         +
ignore and solve : right
         ====================
           500px : width of containing block (width of Initial Containing Block)

   so used right offset value must be 100px .

  */
  </style>
 </head>

 <body>

  <div></div>

 </body>
</html>