selectable.go
func (s *selectable) FirstByXPath(selector string) *Selection {
	return newSelection(s.session, s.selectors.Append(target.XPath, selector).At(0))
}
func (s *selectable) FirstByXPath(selector string) *Selection {
	return newSelection(s.session, s.selectors.Append(target.XPath, selector).At(0))
}
// FirstByXPath finds the first element by XPath selector.