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<html xmlns="http://www.w3.org/1999/xhtml">

 <head>

  <title>CSS Writing Modes Test: position absolute and 'vertical-lr' - 'left: auto', 'width: auto' and 'right: auto' with 'direction: ltr' in initial containing block</title>

  <link rel="author" title="Gérard Talbot" href="http://www.gtalbot.org/BrowserBugsSection/css21testsuite/" />
  <link rel="help" href="http://www.w3.org/TR/css-writing-modes-3/#vertical-layout" title="7.1 Principles of Layout in Vertical Writing Modes" />
  <link rel="match" href="../reference/ref-filled-green-100px-square.xht" />

  <meta content="" name="flags" />
  <meta content="This test checks that when the initial containing block's writing-mode is 'horizontal-tb' and its 'direction' is 'ltr', then an absolutely positioned box (with 'left: auto', 'width: auto' and 'right: auto') whose containing block is the initial containing block must set 'left' to the static position. Whether such absolutely positioned box's 'writing-mode' is vertical or not is irrelevant." name="assert" />

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

  div#green-overlapping-test
    {
      border-left: green solid 25px;
      border-right: green solid 75px;
      height: 100px;
      left: auto;
      position: absolute;
      right: auto;
      width: auto;
      writing-mode: vertical-lr;
    }

  /*
  "
  If all three of 'left', 'width', and 'right' are 'auto': First set any 'auto' values for 'margin-left' and 'margin-right' to 0. Then, if the 'direction' property of the element establishing the static-position containing block is 'ltr' set 'left' to the static position and apply rule number three below; otherwise, set 'right' to the static position and apply rule number one below.
  (...)
  3. 'width' and 'right' are 'auto' and 'left' is not 'auto', then the width is shrink-to-fit . Then solve for 'right'
  "
  10.3.7 Absolutely positioned, non-replaced elements
  http://www.w3.org/TR/CSS21/visudet.html#abs-non-replaced-width

  So:

            auto : left
        +
            0px : margin-left
        +
           25px : border-left-width
        +
            0px : padding-left
        +
           auto : width
        +
            0px : padding-right
        +
           75px : border-right-width
        +
            0px : margin-right
        +
           auto : right
        ====================
                : width of containing block (width of Initial Containing Block)

  becomes

            8px : left
        +
            0px : margin-left
        +
           25px : border-left-width
        +
            0px : padding-left
        +
            0px : width (shrink-to-fit)
        +
            0px : padding-right
        +
           75px : border-right-width
        +
            0px : margin-right
        +
          solve : right
        ====================
                : width of containing block (width of Initial Containing Block)
  */

  div#red-overlapped-reference
    {
      background-color: red;
      height: 100px;
      width: 100px;
    }
  ]]></style>
 </head>

 <body>

  <p>Test passes if there is a filled green square and <strong>no red</strong>.</p>

  <div id="green-overlapping-test"></div>

  <div id="red-overlapped-reference"></div>

 </body>
</html>