I am finding the :nth-child() property to be a bit confusing. Sometimes it takes arguments like :nth-child(2),:nth-child(2n),:nth-child(2n + 1). I'm not sure what these mean exactly - are they referring to even or odd divs, or is there another property at play here?
A quote from the source below
Explaining the concept of using a formula (an + b): where a represents cycle size, n is a counter starting at 0, and b is an offset value.
An example is given to specify a background color for every third
pelement:p:nth-child(3n+0) { background: #ff0000; }
In summary, you can utilize the number :nth-child(n) to target the nth child of an element.
You also have the option of using :nth-child(odd/even) to select alternating children.
Lastly, you can apply the formula mentioned in the quote. By using 3n, you can select every child with an index of 3 (the second child), while 5n will target the child with an index of 5 (the fourth child), and so forth. Adding a value after the plus sign acts as an offset - selecting elements either before or after it.
For instance:
:nth-child(5n+2) - This will choose every element two positions ahead of each 5th element:
5 + 2 = Index of 7, representing the 6th element10 + 2 = Index of 12, representing the 11th element15 + 2 = Index of 17, representing the 16th element20 + 2 = Index of 22, representing the 21st elementThe :nth-child() function can take odd/even or an expression as a parameter, where the most basic expression is just a simple number.
For in-depth information about how :nth-child works, check out this article on CSS-tricks.com: https://css-tricks.com/how-nth-child-works/
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