or (var i = 0; i < elt.childNodes.length; ++i) {
        flushLayout(elt.childNodes[i]);
      }
    }
    window.onload = function() {
      flushLayout(document.documentElement);
      document.getElementById("target").className = "block";
    }
  ]]></script>
 </head>
 <body>
   <div class="run-in">Run-in header</div>
   <span id="target">Start of block.
    The run-in header should be inside the border around this block and there
    should be no space between the word "header" and the word "Start".</sp