HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <title>aspect-ratio: inherit</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;
    }

    .track {
      width: 220px;
      background: #e2e8f0;
    }

    /* inherit copies the parent only, so 16 / 9 sits on this track. */
    .named { aspect-ratio: 16 / 9; }

    .box {
      width: 120px;
      background: #1d4ed8;
      color: #fff;
      font-weight: 700;
      text-align: center;
    }

    .child { aspect-ratio: inherit; }
  </style>
</head>
<body>
  <p>The first track's ratio is <strong>16 / 9</strong>. <strong>inherit</strong> copies that onto its child. The second box keeps <strong>auto</strong>. Width is set on each box. It is not inherited.</p>
  <div class="row">
    <div class="track named"><div class="box child">Inherit</div></div>
    <div class="track"><div class="box">Auto</div></div>
  </div>
</body>
</html>

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CSS aspect-ratio Property — inherit