HTML Code

<!DOCTYPE html>
<html>
<head>
  <title>CSS [class*=] Example</title>
  <style>
    [class*="btn-"] {
      display: inline-block;
      padding: 0.5rem 1rem;
      border: none;
      border-radius: 6px;
      font-weight: 600;
      cursor: pointer;
      margin-right: 0.5rem;
      margin-bottom: 0.5rem;
    }

    .btn-primary { background: #2563eb; color: #fff; }
    .btn-danger { background: #dc2626; color: #fff; }
    .btn-ghost { background: #e2e8f0; color: #1e293b; }
  </style>
</head>
<body>
  <h1>Button Variants</h1>
  <button class="btn-primary">Save</button>
  <button class="btn-danger">Delete</button>
  <button class="btn-ghost">Cancel</button>
</body>
</html>

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CSS [attribute*=value] - Class Name Pattern