HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <title>scroll-padding-top vs block-start</title>
  <style>
    body {
      font-family: Arial, sans-serif;
      margin: 16px;
      color: #0f172a;
    }

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

    .scroller {
      height: 200px;
      overflow-y: auto;
      scroll-snap-type: y mandatory;
      border: 1px solid #64748b;
      border-radius: 8px;
      scroll-padding-top: 48px;
    }

    .panel {
      height: 160px;
      scroll-snap-align: start;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      font-size: 1.125rem;
    }

    .panel:nth-child(odd) {
      background: #c7d2fe;
    }

    .panel:nth-child(even) {
      background: #a5f3fc;
    }
  </style>
</head>
<body>
  <p>Physical <strong>scroll-padding-top: 48px</strong> matches <code>scroll-padding-block-start</code> in horizontal-tb.</p>
  <div class="scroller">
    <div class="panel">1</div>
    <div class="panel">2</div>
    <div class="panel">3</div>
  </div>
</body>
</html>

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CSS scroll-padding-top Property — vs logical start