HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Vertical scroll-snap-stop onboarding</title>
  <style>
    body {
      font-family: system-ui, sans-serif;
      padding: 20px;
      background: #f8fafc;
    }

    .onboarding {
      height: 320px;
      overflow-y: scroll;
      scroll-snap-type: y mandatory;
      border: 2px solid #2563eb;
      border-radius: 12px;
      background: #fff;
    }

    .step {
      height: 100%;
      scroll-snap-align: start;
      display: grid;
      place-items: center;
      font-size: 1.25rem;
      font-weight: 700;
      color: #1e3a8a;
      padding: 1rem;
      text-align: center;
    }

    .step--required {
      background: #dbeafe;
      scroll-snap-stop: always;
    }

    .step--optional {
      background: #eff6ff;
    }
  </style>
</head>
<body>
  <h1>Onboarding Always Stop</h1>
  <p>The required step uses <code>scroll-snap-stop: always</code>.</p>
  <div class="onboarding">
    <div class="step step--required">Step 1: Required intro (always)</div>
    <div class="step step--optional">Step 2: Optional tip</div>
    <div class="step step--optional">Step 3: Finish setup</div>
  </div>
</body>
</html>

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Always stop on a key onboarding panel