#### Description »

Styles specified child or children of a particular element.

#### Details »

In short, the **:nth-child()** pseudo-class selects a specified child or specified children of a particular element. For instance, if you had an unordered list with a bunch of <li> elements in it, using this pseudo-class you can select specific <li> elements and style them.

You specify which child using the parentheses. For instance, `ul li`:**nth-child(**5**)** will select the 5th <li> element of the <ul> block.

You can also select a pattern of elements using the value in the parentheses. You can provide a formula that selects any element that fits the formula:

**:nth-child(***a*n+*b***)**

In words, this selects every *a*^{th} element starting at *b*. If I used `ul li`**:nth-child(**2n+1**)**, every second element starting at the first one will be styled.

You can also specify two keywords: odd and even. Using odd will style every odd-numbered element (1st, 3rd, etc.), whereas using even will style every even-numbered element.

#### Examples »

The table below is styled so that every third element starting with the second is given a reddish background. Also, every second element starting with the third is given a red text color.

Number | Special Thing |
---|---|

1 | The multiplicative identity. |

2 | The only even prime. |

3 | Number of spatial dimensions we experience. |

4 | Smallest number of colors sufficient to color all planar maps. |

5 | Number of Platonic solids. |

6 | Smallest perfect number. |

7 | Smallest number of sides of a regular polygon that is not constructible by straightedge and compass. |

8 | Largest cube in the Fibonacci sequence. |

9 | Maximum number of cubes that are needed to sum to any positive integer. |

10 | Base of our number system. |

11 | Largest known multiplicative persistence. |

12 | Smallest abundant number. |

13 | Number of Archimedian solids. |

14 | Smallest even number n with no solutions to φ(m) = n. |

15 | Smallest composite number n with the property that there is only one group of order n. |

16 | Only number of the form x^{y} = y^{x} with x and y being different integers. |

17 | Number of wallpaper groups. |

18 | Only positive number that is twice the sum of its digits. |

19 | Maximum number of 4th powers needed to sum to any number. |

20 | Number of rooted trees with 6 vertices. |

Courtesy of http://www2.stetson.edu/~efriedma/numbers.html

table.wiki-content-table tr:nth-child(3n+2){ background: #FDD; } table.wiki-content-table tr:nth-child(2n+3){ color: #900; }

**Try It** on the CSS Zone Sandbox!

#### Base CSS »

Not defined in Base CSS.