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

 <head>

  <title>CSS Writing Modes Test: 'vertical-lr' and margin collapsing - right margin of a block collapses with right margin of its last child</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/#logical-direction-layout" title="7.4 Flow-Relative Mappings" />
  <link rel="match" href="../reference/ref-filled-green-100px-square.xht" />

  <!--
  "
  The margin collapsing rules apply exactly with the block-start margin substituted for the top margin and the block-end margin substituted for the bottom margin.
  "
  -->

  <meta content="ahem image" name="flags" />
  <meta name="assert" content="This test checks that, in a vertical-lr context, the right margin an in-flow block box collapses with its last in-flow block-level child's right margin if the element has no right padding and no right border and the child's right margin does not collapse with a left margin that has clearance." />

  <style type="text/css"><![CDATA[
  div
    {
      font: 25px/1em Ahem;
      height: 4em;
    }

  div#wrapper
    {
      background: red url("support/margin-collapse-2em-space-wm-vert.png") -1em top;
      border-left: green solid 1em;
      width: 3em;
      writing-mode: vertical-lr;
    }

  div#parent
    {
      background-color: green;
      margin-right: 2em; /* block-end margin */
    }

  div#last-child
    {
      margin-right: 2em; /* block-end margin of last child */
    }

  div#following-parent
    {
      background-color: green;
      width: 1em;
    }
  ]]></style>

 </head>

 <body>

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

  <div id="wrapper">
    <div id="parent">
      <div id="widthless-child"></div>
      <div id="last-child"></div>
    </div>
    <div id="following-parent"></div>
  </div>

 </body>
</html>