How Can I Efficiently Select Every Nth Element in CSS Using `nth-child()`?

Selecting Every Nth Element in CSS

The nth-child() selector in CSS provides a convenient way to target specific child elements within their parent element. However, it can be cumbersome to list out each nth child individually. Is there a more efficient method?

Using Arithmetic Expressions in nth-child()

The true power of nth-child() lies in its ability to incorporate arithmetic expressions using the "n" variable. This variable represents the position of the child element within its parent.

Simplified Selector for Every 4th Element

To select every fourth div element, replace the individual selectors with the following:

div:nth-child(4n)

This expression means that the selector matches any div element that is a multiple of 4 (e.g., 0, 4, 8, 12).

Customization via Arithmetic

The n variable allows for further customization. For example:

• 2n - 1: Matches odd-numbered div elements (e.g., 1, 3, 5).
• 4n 2: Matches div elements with positions that are two more than a multiple of 4 (e.g., 2, 6, 10).

Equalizing Arithmetic Expressions

While 4n and 4n 4 may seem identical at first glance, they are not. nth-child() starts counting from 0. 4n will match elements at positions 0, 4, 8, while 4n 4 will match elements at positions 4, 8, 12.

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