# File lib/html5/treebuilders/rexml.rb, line 44
        def insertBefore node, refNode
          index = childNodes.index(refNode)
          if node.kind_of?(TextNode) and index > 0 && childNodes[index-1].kind_of?(TextNode)
            childNodes[index-1].rxobj.value = childNodes[index-1].rxobj.to_s + node.rxobj.to_s
            childNodes[index-1].rxobj.raw = true
          else
            childNodes.insert index, node
            refNode.rxobj.parent.insert_before(refNode.rxobj,node.rxobj)
          end
        end