margin-collapse-clear-013.xht | Explore in Territory

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">

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

 <head>

  <title>CSS Test: Margin collapsing with clearance - margins of a 'collapsed through' box with clearance do not collapse with parent block's bottom margin</title>

  <link rel="help" href="http://www.w3.org/TR/CSS21/box.html#collapsing-margins" />
  <link rel="help" href="http://www.w3.org/TR/CSS21/visudet.html#normal-block" />
  <link rel="bookmark" href="http://lists.w3.org/Archives/Public/public-css-testsuite/2013Oct/0009.html" title="Issue with margin-collapse-clear-012.htm and margin-collapse-clear-013.htm" />
  <link rel="author" title="Gérard Talbot" href="http://www.gtalbot.org/BrowserBugsSection/css21testsuite/" />
  <link rel="author" title="Bruno Fassino" href="fassino[at]gmail.com" />
  <link rel="match" href="margin-collapse-clear-012-ref.xht" />

  <meta content="When an element has had clearance applied to it and its own margins collapse, these margins do not collapse with the bottom margin of the parent block" name="assert" />

  <style type="text/css"><![CDATA[
  #rel-pos-wrapper {position: relative;}

  #parent-lime
  {
  background-color: lime;
  border-top: black solid 1px;
  width: 50%;
  }

  #float-left-blue
  {
  background-color: blue;
  float: left;
  height: 100px;
  width: 100px;
  }

  #clear-left
  {
  clear: left;
  margin-bottom: 140px;
  margin-top: 40px;
  }

  #next-yellow
  {
  background-color: yellow;
  height: 100px;
  }

  .ref-overlapped-red
  {
  background-color: red;
  position: absolute;
  z-index: -1;
  }

  #ref1
  {
  height: 200px;
  top: 1px;
  width: 50%;
  }

  #ref2
  {
  height: 100px;
  top: 201px;
  width: 100%;
  }
  ]]></style>

 </head>

 <body>

  <p>Test passes if there is <strong>no red</strong>.</p>

  <div id="rel-pos-wrapper">

  <!--

     clearance
   +
     margin-top of #clear-left (40px)
   ====================================
     height of #float-left-blue (100px)

     therefore, clearance is equal to +60px

  -->

  <!--

  #parent-lime should have height 200px, sum of:

    100px          : height of #float-left-blue
  +
    (140px - 40px) : part of #clear-left's margin-bottom
                     exceeding #clear-left's margin-top
  =======
   200px

  The position of the top border edge of the div#clear-left
  is where it would have been if the element had a
  non-zero bottom border. The margins of div#clear-left
  collapse together to 140px and the top border edge of
  div#clear-left is at 40px inside of it. Clearance is
  added at such position, not to the whole 140px.

  Issue with margin-collapse-clear-012.htm and margin-collapse-clear-013.htm
  http://lists.w3.org/Archives/Public/public-css-testsuite/2013Oct/0012.html

  -->

    <div id="parent-lime">
      <div id="float-left-blue"></div>
      <div id="clear-left"></div>
    </div>

   <!--
   #next-yellow should immediately follow #parent-lime (no margins in between)
   -->

    <div id="next-yellow"></div>

   <!--
   #ref1 and #ref2 boxes create a sort of 'reference rendering'
   where #ref1 should be covered, overlapped by #parent-lime
   while #ref2 should be covered, overlapped by #next-yellow.
   -->

    <div id="ref1" class="ref-overlapped-red"></div>
    <div id="ref2" class="ref-overlapped-red"></div>

  </div>

 </body>
</html>
chromium/third_party/blink/web_tests/external/wpt/css/CSS2/floats-clear/margin-collapse-clear-013.xht
