class Nokogiri::CSS::XPathVisitor

def visit_element_name(node)
  if @doctype == DoctypeConfig::HTML5 && node.value.first != "*"
    # if there is already a namespace, use it as normal
    return node.value.first if node.value.first.include?(":")
    # HTML5 has namespaces that should be ignored in CSS queries
    # https://github.com/sparklemotion/nokogiri/issues/2376
    if @builtins == BuiltinsConfig::ALWAYS || (@builtins == BuiltinsConfig::OPTIMAL && Nokogiri.uses_libxml?)
      if WILDCARD_NAMESPACES
        "*:#{node.value.first}"
      else
        "*[nokogiri-builtin:local-name-is('#{node.value.first}')]"
      end
    else
      "*[local-name()='#{node.value.first}']"
    end
  else
    node.value.first
  end
end