func (s *Selection) Attribute(attribute string) (string, error) {
	return s.hasProperty(element.Element.GetAttribute, attribute, "attribute")
}
func (s *Selection) Attribute(attribute string) (string, error) {
	return s.hasProperty(element.Element.GetAttribute, attribute, "attribute")
}
func ( s * Selection ) Attribute ( attribute string ) ( string , error ) { return s . hasProperty ( element . Element . GetAttribute , attribute , " " ) }
// Attribute returns an attribute value for exactly one element.
Attribute returns an attribute value for exactly one element .