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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: 0; padding: 1.5rem; background: #f8fafc; color: #334155; line-height: 1.6; }
    h1 { margin: 0 0 0.5rem; font-size: 1.25rem; color: #0f172a; }
    p { margin: 0 0 1rem; max-width: 440px; }
    button { padding: 0.55rem 1rem; font-size: 0.9375rem; background: #2563eb; color: #fff; border: none; border-radius: 8px; cursor: pointer; }
    button:hover { background: #1d4ed8; }
    #status { padding: 0.75rem 1rem; max-width: 440px; background: #fff; border: 1px solid #e2e8f0; border-radius: 8px; font-size: 0.875rem; }
    #status.ok { border-left: 4px solid #22c55e; }
    #status.err { border-left: 4px solid #ef4444; }
    code { background: #e2e8f0; padding: 0.1rem 0.35rem; border-radius: 4px; }
  </style>
</head>
<body>
  <h1>Open IndexedDB</h1>
  <p>Click to run <code>indexedDB.open()</code> and create a <code>contacts</code> object store.</p>
  <button type="button" id="setupBtn">Open &amp; create store</button>
  <p id="status">Ready.</p>
  <script>
    var statusEl = document.getElementById('status');
    if (!window.indexedDB) {
      statusEl.textContent = 'IndexedDB is not supported in this browser.';
      statusEl.className = 'err';
    } else {
      document.getElementById('setupBtn').addEventListener('click', function () {
        var req = indexedDB.open('tryitIntro', 1);
        req.onupgradeneeded = function (e) {
          e.target.result.createObjectStore('contacts', { keyPath: 'id', autoIncrement: true });
        };
        req.onsuccess = function () {
          statusEl.textContent = 'Database opened. Object store "contacts" is ready.';
          statusEl.className = 'ok';
        };
        req.onerror = function (e) {
          statusEl.textContent = 'Error: ' + e.target.error.message;
          statusEl.className = 'err';
        };
      });
    }
  </script>
</body>
</html>
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IndexedDB — Open Database & Create Store
