raise ArgumentError if more specifiers are used with :xpath

watir/lib/watir/supported_elements.rb

@@ -34,7 +34,7 @@ def #{args.delete(:plural) || method_name.to_s + "s"}(how={}, what=nil)
     def format_specifiers(tag_name, how, what)
       defaults = {:tag_name => [tag_name].flatten.map(&:to_s)}
       formatted_specifiers = defaults.merge(what ? {how => what} : how)
-      if formatted_specifiers[:xpath] && formatted_specifiers.size > 1
+      if formatted_specifiers[:xpath] && formatted_specifiers.size > 2
         raise ArgumentError, ":xpath specifier should be the only one when used in #{formatted_specifiers.inspect}"
       end
       formatted_specifiers