When dealing with a set of elements, it's often necessary to select specific elements at regular intervals. For example, you may want to select every fourth, sixth, or tenth element. Traditionally, this was achieved by explicitly specifying each nth element, such as:
div:nth-child(4), div:nth-child(8), div:nth-child(12), div:nth-child(16)
However, there's a more efficient way to achieve this using the :nth-child() selector.
The :nth-child() selector allows you to construct arithmetic expressions using the n variable. This means you can perform addition, subtraction, and coefficient multiplication.
To select every fourth element, you would use the following selector:
div:nth-child(4n)
This expression means that it will match every element that is 0n, 4n, 8n, and so on.
It's important to note that this expression assumes all child elements are of the same type. If you have elements of different types, such as h1 or p, you should use :nth-of-type() instead:
<body> <h1></h1> <div>1</div> <div>2</div> <div>3</div> <div>4</div> <h2></h2> <div>5</div> <div>6</div> <div>7</div> <div>8</div> <h2></h2> <div>9</div> <div>10</div> <div>11</div> <div>12</div> <h2></h2> <div>13</div> <div>14</div> <div>15</div> <div>16</div> </body>
div:nth-of-type(4n)
In CSS, the n variable starts counting from 0. Therefore, if you use the expression 4n, it will select the elements with index 0, 4, 8, and so on. If you want to count from 1, you can use the expression 4n 1 instead.
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