<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml" class="reftest-wait">
  <head>
    <bindings xmlns="http://www.mozilla.org/xbl">
      <binding id="a">
        <content>
          <html:span xmlns:html="http://www.w3.org/1999/xhtml"
                     id="hasBefore"><children/></html:span>
        </content>
      </binding>
    </bindings>
    <style>
      #hasBefore::before { content: "x"; }
    </style>
    <script>
      function doTest() {
        var l = document.getElementById("l");
        l.parentNode.insertBefore(document.createTextNode("y"), l);
        document.documentElement.removeAttribute("class");
      }
    </script>
  </head>
  <body onload="doTest()">
    <div style="-moz-binding: url(#a); font-size: 300%;"><span id="l"></span></div>
  </body>
</html>