HTML Code

<!DOCTYPE html>

<html lang=en>

<head>

  <meta charset=UTF-8>

  <meta name=viewport content="width=device-width,initial-scale=1">

  <title>ononline — retry sync</title>

  <style>body{font-family:system-ui,sans-serif;margin:0;padding:1.5rem;background:#f8fafc;color:#334155;line-height:1.7}h1{margin:0 0 .75rem;font-size:1.25rem;color:#0f172a}#banner{padding:.75rem 1rem;background:#991b1b;color:#fff;font-size:.875rem;font-weight:600;border-radius:8px;max-width:420px;margin-bottom:1rem}#banner[hidden]{display:none}#status{padding:.75rem 1rem;background:#eff6ff;border:1px solid #bfdbfe;border-radius:8px;font-size:.875rem;max-width:420px}</style>

</head>

<body>

  <div id=banner hidden role=status aria-live=polite>

    You are offline — changes will sync when you reconnect.

  </div>

  <h1>Reconnect sync demo</h1>

  <p>Go offline, then back online to see the banner hide and sync run.</p>

  <div id=status>Ready.</div>



  <script>var banner=document.getElementById("banner"),status=document.getElementById("status"),queue=0;function flushQueue(){queue>0?(status.textContent="Synced "+queue+" pending change(s).",queue=0):status.textContent="Back online — nothing to sync."}function handleOnline(){banner.hidden=!0,status.textContent="Syncing pending changes…",setTimeout(flushQueue,600)}function handleOffline(){banner.hidden=!1,queue+=1,status.textContent="Offline — 1 change queued."}window.addEventListener("online",handleOnline),window.addEventListener("offline",handleOffline),banner.hidden=navigator.onLine</script>

</body>

</html>

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HTML ononline Attribute — Retry sync