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<!DOCTYPE html>
<html>
<body ononline="onFunction()" onoffline="offFunction()">
​
<p>Open the File menu and click on "Work Offline" to toggle between working online and offline.</p>
​
<p><strong>Note:</strong> The ononline and onoffline events are only supported in Firefox and Internet Explorer version 8 to 10.</p>
​
<script>
function onFunction() {
  alert ("Your browser is working online.");
}
​
function offFunction() {
  alert ("Your browser is working offline.");
}
</script>
​
</body>
​
</html>
​
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