# 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://' + path.join(__dirname, '/online-status.html'));
});
```
_online-status.html_
```html
```
There may be instances where one wants to respond to these events in the
browser process as well. The browser process however does not have a
"navigator" object and thus cannot detect these events directly. Using
Atom-shell's inter-process communication utilities, the events can be forwarded
to the browser 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://' + path.join(__dirname, '/online-status.html'));
});
ipc.on('onlineStatusMessage', function(event, status) {
console.log(status);
});
```
_online-status.html_
```html
```