HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <title>aspect-ratio: auto 3 / 2</title>
  <style>
    body {
      font-family: Arial, sans-serif;
      margin: 16px;
      color: #0f172a;
    }

    p {
      margin: 0 0 12px;
      max-width: 40rem;
      line-height: 1.5;
    }

    .row {
      display: flex;
      flex-wrap: wrap;
      align-items: flex-start;
      gap: 12px;
    }

    .label {
      margin: 0 0 8px;
      font-weight: 700;
    }

    .box, .photo {
      width: 180px;
      background: #1d4ed8;
      aspect-ratio: auto 3 / 2;
    }

    .box {
      display: flex;
      align-items: center;
      justify-content: center;
      color: #fff;
      font-weight: 700;
    }

    .photo { display: block; }
  </style>
</head>
<body>
  <p>Both use <strong>auto 3 / 2</strong>. The div has no natural ratio, so it stays 3 / 2. The image is 2 / 1, so <strong>auto</strong> uses that after it loads.</p>
  <div class="row">
    <div>
      <p class="label">div: auto 3 / 2</p>
      <div class="box">3 / 2</div>
    </div>
    <div>
      <p class="label">image: auto 3 / 2</p>
      <img class="photo" alt="Green rectangle, twice as wide as it is tall" src="data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='100' height='50'%3E%3Crect width='100' height='50' fill='%230f766e'/%3E%3C/svg%3E">
    </div>
  </div>
</body>
</html>

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CSS aspect-ratio Property — auto and a ratio