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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>IndexedDB open()</title>
  <style>
    body { font-family: system-ui, sans-serif; margin: 1.5rem; line-height: 1.5; }
    button { padding: 0.5rem 0.9rem; cursor: pointer; }
    #status { margin-top: 1rem; }
  </style>
</head>
<body>
  <h1>Open a database</h1>
  <p>Create <code>contacts</code> in <code>onupgradeneeded</code>.</p>

  <button type="button" id="openBtn">Open demoDb</button>
  <p id="status">Click Open to start.</p>

  <script>
    var statusEl = document.getElementById('status');

    if (!window.indexedDB) {
      statusEl.textContent = 'IndexedDB is not available.';
    }

    document.getElementById('openBtn').addEventListener('click', function () {
      var req = indexedDB.open('tryitHubOpen', 1);

      req.onupgradeneeded = function (event) {
        var db = event.target.result;
        if (!db.objectStoreNames.contains('contacts')) {
          db.createObjectStore('contacts', { keyPath: 'id' });
        }
      };

      req.onsuccess = function (event) {
        statusEl.textContent = 'Ready: ' + event.target.result.name;
        event.target.result.close();
      };

      req.onerror = function () {
        statusEl.textContent = 'Error: ' + (req.error && req.error.message);
      };
    });
  </script>
</body>
</html>

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IndexedDB — Open Database & Create Store