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

 <head>

  <title>CSS Test: Margin collapsing - margins of a 'collapsed through' box without clearance can collapse with parent block's bottom margin</title>

  <link rel="help" href="http://www.w3.org/TR/CSS21/box.html#collapsing-margins">
  <link rel="author" title="Gérard Talbot" href="http://www.gtalbot.org/BrowserBugsSection/css21testsuite/">
  <link rel="author" title="Daniel Schattenkirchner" href="crazy-daniel{at}gmx.de">
  <link rel="match" href="margin-collapse-clear-017-ref.htm">

  <meta content="An element that does not have clearance applied to it can collapse its top margin with its parent block's bottom margin. Margins of a 'collapsed through' box without clearance applied to it can collapse with its parent block's bottom margin. An element with 'clear' set to a value other than 'none' can create a clearance only if and only when there is an earlier (in the source document) floating box." name="assert">
  <meta content="image" name="flags">

  <style type="text/css">
  body
  {
  background: white url("support/ruler-v-100px-200px-300px.png") no-repeat;
  margin: 34px 8px 8px 55px; 
  /* 
    34px : body's top margin collapsing with p's top margin: max(34px, 16px) 
  + 20px : p's 1st line box height 
  + 20px : p's 2nd line box height
  + 16px : p's bottom margin 
  + 10px : height of topmost green bar
  ======
   100px 
  */
  }

  p
  {
  font-size: 16px;
  line-height: 20px;
  margin: 1em 8px;
  }

  div#parent-block {margin-bottom: 100px;}

  div.vertical-gap-separator
  {
  background-color: green;
  height: 10px;
  }

  div#element-without-clearance
  {
  clear: both;
  margin-top: 100px;
  }
  
  /*
  In this test, div#element-without-clearance
  is what the spec refers to as
  'collapsed through' box
  http://www.w3.org/TR/CSS21/box.html#collapsed-through
  */
  </style>

 </head>

 <body>

  <p>Test passes if there is a vertical gap<br>
  of exactly 100px between 2 green bars.</p>

  <div id="parent-block">
    <div class="vertical-gap-separator"></div>
    <div id="element-without-clearance"></div>
  </div>

  <div class="vertical-gap-separator"></div>

  <!--
  div#element-without-clearance's margin-top should collapse 
  with #parent-block's margin-bottom: max(100px, 100px) = 100px
  -->

 </body>
</html>