How to Create a Snake-Line Filling Pattern in CSS Grid with Grid-Auto-Flow?

Grid-Auto-Flow in Snake Lines

In CSS grid, it is possible to create a snake-like filling pattern using the grid-auto-flow property. This property determines how the remaining space in the grid is filled. One way to achieve a snake-like pattern is to use the column dense value for the grid-auto-flow property. This will fill the available cells in a column-by-column manner, and then move to the next row.

To create a snake-line pattern, we can make use of the fact that there will always be three rows in the grid. By using the :nth-child selector, we can specify that every fourth, fifth, and sixth element should be placed in the third, second, and first rows respectively. This creates the snake-like filling pattern.

<code class="css">.container {
  display: grid;
  grid-template-rows: 20px 20px 20px;
  grid-auto-columns: 20px;
  grid-auto-flow: column dense;
}

.container > div:nth-child(6n + 4) { grid-row: 3; }
.container > div:nth-child(6n + 5) { grid-row: 2; }

/* Irrelevant styles */
.container {
  grid-gap: 5px;
  counter-reset: num;
  margin: 10px;
}

.container > div {
  border: 1px solid;
}

.container > div:before {
  content: counter(num);
  counter-increment: num;
}</code>

This CSS will produce the following result:

<code class="html"><div class="container">
  <div></div>
<div></div>
<div></div>
<div></div>
<div></div>
<div></div>
<div></div>
<div></div>
</div>

<div class="container">
  <div></div>
<div></div>
<div></div>
<div></div>
<div></div>
<div></div>
<div></div>
<div></div>
<div></div>
<div></div>
<div></div>
<div></div>
</div>

<div class="container">
  <div></div>
<div></div>
<div></div>
<div></div>
<div></div>
<div></div>
<div></div>
<div></div>
<div></div>
<div></div>
<div></div>
<div></div>
<div></div>
<div></div>
<div></div>
<div></div>
</div></code>

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