Choosing nth-child for a potentially endless list of children

I have a grid - 4 columns per row. I am using CSS grid layout.

Say there could potentially be an infinite number of elements.

<div class="grid">
    <div class="item"></div>
    <div class="item"></div>
    <!-- ... -->
</div>

How can I select the two middle elements of each row if the number of elements is potentially infinite. For example, for the first three lines, I would need to select:

nth-child(2), nth-child(3), nth-child(6), nth-child(7), nth-child(10),nth-child(11)

I could hard code the styles to a certain number, assuming there would be no infinite number, but if there is a way to do it dynamically, I would rather do it.

enter image description here

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3 answers

.item:nth-child(4n+2) ( 2- ) .item:nth-child(4n+3) ( 3-) ). :

.item:nth-child(4n+2),
.item:nth-child(4n+3) {
  color: red;
  background-color: yellow;
}
<div class="grid">
    <div class="item">1</div>
    <div class="item">2</div>
    <div class="item">3</div>
    <div class="item">4</div>
    <div class="item">5</div>
    <div class="item">6</div>
    <div class="item">7</div>
    <div class="item">8</div>
    <div class="item">9</div>
    <div class="item">10</div>
    <div class="item">11</div>
    <div class="item">12</div>
</div>
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+6

nth-child(xN+y)...

.container {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  grid-gap: 25px;
}

.box {
  padding: 1em;
  border: 1px solid grey;
}

.container :nth-child(4n+2) {
  background: red;
}

.container :nth-child(4n+3) {
  background: blue;
}
<div class="container">
  <div class="box"></div>
  <div class="box"></div>
  <div class="box"></div>
  <div class="box"></div>
  <div class="box"></div>
  <div class="box"></div>
  <div class="box"></div>
  <div class="box"></div>
  <div class="box"></div>
  <div class="box"></div>
  <div class="box"></div>
  <div class="box"></div>
  <div class="box"></div>
  <div class="box"></div>
  <div class="box"></div>
  <div class="box"></div>
  <div class="box"></div>
  <div class="box"></div>
  <div class="box"></div>
  <div class="box"></div>
  <div class="box"></div>
  <div class="box"></div>
  <div class="box"></div>
  <div class="box"></div>
  <div class="box"></div>
</div>
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+2

Following is js solution:

var items = document.getElementsByClassName('item');
for (i = 0; i < items.length; i++) {
  if(i % 2 === 0 && i % 4 === 0) {
    var el1 = items[i + 1];
    var el2 = items[i + 2];
    if (el1)
      el1.style.backgroundColor = "red";
    if (el2)
      el2.style.backgroundColor = "red";
  }
}
.grid {
  display:grid;
  grid-template-columns: 100px 100px 100px 100px;
}

.item {
  border:1px solid black;
  padding:20px;
  margin:4px;
}
<div class="grid">
  <div class="item"></div>
  <div class="item"></div>
  <div class="item"></div>
  <div class="item"></div>
  <div class="item"></div>
  <div class="item"></div>
  <div class="item"></div>
  <div class="item"></div>
  <div class="item"></div>
  <div class="item"></div>
  <div class="item"></div>
  <div class="item"></div>
  <div class="item"></div>
  <div class="item"></div>
</div>
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Source: https://habr.com/ru/post/1686270/


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