Is PubNub compatible with iOS Web Browser (Mobile Safari)?

PubNub JavaScript API implementation works on Mobile Safari, the iOS Web Browser app.

NOTE: If your app makes cross origin (CORS) JavaScript requests, the activity indicator in the browser's status bar may continuously spin (even though nothing is happening). This is because Mobile Safari treats PubNub's live socket connection to the device as loading and shows a system-level spinner. This effect is only avoidable by deploying natively with Cordova / WebView / PhoneGap.

This is a known issue with Safari with other SDKs that keep a live socket connection open.