HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <title>grid: auto-flow / columns</title>
  <style>
    section {
      display: grid;
      grid: auto-flow / 1fr 1fr 1fr;
    }
  </style>
</head>
<body>
  <section>
    <div>1</div>
    <div>2</div>
    <div>3</div>
    <div>4</div>
    <div>5</div>
    <div>6</div>
  </section>
</body>
</html>

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CSS grid Property — auto-flow rows