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<!DOCTYPE html>

<html lang=en>

<head>

  <meta charset=UTF-8>

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

  <title>ononline — body handler</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}#status{padding:.75rem 1rem;border-radius:8px;font-size:.875rem;font-weight:600;max-width:420px}.online{background:#f0fdf4;border:1px solid #bbf7d0;color:#166534}.offline{background:#fef2f2;border:1px solid #fecaca;color:#991b1b}</style>

</head>

<body onoffline=handleOffline() ononline=handleOnline()>

  <h1>ononline / onoffline on body</h1>

  <p>Go offline in DevTools, then reconnect to test ononline.</p>

  <p id=status class=online>Online</p>



  <script>function handleOnline(){var n=document.getElementById("status");n.textContent="Back online!",n.className="online"}function handleOffline(){var n=document.getElementById("status");n.textContent="Offline",n.className="offline"}navigator.onLine||handleOffline()</script>

</body>

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HTML ononline Attribute — body handler