By toggling a class name on the table, the descendant selector is applied and certain rows are shown and hidden.

even row, even row, even row, even row, even row, even row |

odd row, odd row, odd row, odd row, odd row, odd row |

even row, even row, even row, even row, even row, even row |

odd row, odd row, odd row, odd row, odd row, odd row |

even row, even row, even row, even row, even row, even row |

odd row, odd row, odd row, odd row, odd row, odd row |

even row, even row, even row, even row, even row, even row |

odd row, odd row, odd row, odd row, odd row, odd row |