<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<bindings xmlns="http://www.mozilla.org/xbl"
xmlns:xhtml="http://www.w3.org/1999/xhtml">
<binding id="a">
<content>
<xhtml:div>
<children includes="span"/>
</xhtml:div>
<xhtml:div>
<children/>
</xhtml:div>
</content>
</binding>
</bindings>
</head>
<body>
<div style="-moz-binding: url(#a);">
<div>3</div><span>1</span><div>4</div><span>2</span><div>5</div>
</div>
</body>
</html>