HTML Code

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

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

    div {
      border-top-style: hidden;
      border-top-width: 3px;
      border-top-color: #0f172a;
      padding: 12px;
      max-width: 18rem;
      background: #f1f5f9;
    }
  </style>
</head>
<body>
  <p><strong>border-top-style: hidden</strong> looks like none on a normal box. In collapsed tables it has higher priority.</p>
  <div>Hidden top border</div>
</body>
</html>

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CSS border-top-style Property — hidden