Test
<html>
<head>
<script>
window.addEventListener('offline', function(e) { console.log('offline'); });
window.addEventListener('online', function(e) { console.log('online'); });
</script>
</head>
<body></body>
</html>
Local Storage
localStorage.setItem('key', 'value');
val value = localStorage.getItem('key');
localStorage.removeItem('key');
localStorage.clear();
Web Security Checklist
- Subresource Integrity. SRI, linking to 3rd party resources.
- Content-Security-Policy
Read or other Links
Here are some articles to read.