selectable.go
func (s *selectable) FirstByLabel(text string) *Selection {
	return newSelection(s.session, s.selectors.Append(target.Label, text).At(0))
}
func (s *selectable) FirstByLabel(text string) *Selection {
	return newSelection(s.session, s.selectors.Append(target.Label, text).At(0))
}
// FirstByLabel finds the first element by associated label text.