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+# Online/Offline Event Detection
+
+Online and offline event detection can be implemented in the renderer process
+using standard HTML5 APIs, as shown in the following example.
+
+_main.js_
+
+```javascript
+var app = require('app');
+var BrowserWindow = require('browser-window');
+var onlineStatusWindow;
+
+app.on('ready', function() {
+ onlineStatusWindow = new BrowserWindow({ width: 0, height: 0, show: false });
+ onlineStatusWindow.loadUrl('file://' + __dirname + '/online-status.html');
+});
+```
+
+_online-status.html_
+
+```html
+
+
+
+
+
+
+```
+
+There may be instances where you want to respond to these events in the
+main process as well. The main process however does not have a
+`navigator` object and thus cannot detect these events directly. Using
+Electron's inter-process communication utilities, the events can be forwarded
+to the main process and handled as needed, as shown in the following example.
+
+_main.js_
+
+```javascript
+var app = require('app');
+var ipc = require('ipc');
+var BrowserWindow = require('browser-window');
+var onlineStatusWindow;
+
+app.on('ready', function() {
+ onlineStatusWindow = new BrowserWindow({ width: 0, height: 0, show: false });
+ onlineStatusWindow.loadUrl('file://' + __dirname + '/online-status.html');
+});
+
+ipc.on('online-status-changed', function(event, status) {
+ console.log(status);
+});
+```
+
+_online-status.html_
+
+```html
+
+
+
+
+
+
+```