diff --git a/demos/nav-online.html b/demos/nav-online.html
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+<title>navigator.onLine testing</title>
+<article>
+  <p>Current network status: <span id="status">checking...</span></p>
+  <p>A timer is constantly polling the navigator.onLine property, which is typically switched via File -&gt; Work Offline</p>
+</article>
+<script>
+var status = document.getElementById('status')
+
+setInterval(function () {
+  status.className = navigator.onLine ? 'online' : 'offline';
+  status.innerHTML = navigator.onLine ? 'online' : 'offline';  
+}, 250);
+</script>
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