I have created an PWA app in angular. In this app background syncing start on initial load in online mode. This background sync work well when the user iPhone screen is on and he switch to another app and come back. But when user get idle the iPhone goes in sleep mode or locked and the background sync stops. It resumes again when user is turn on the screen. It is happening specifically to iPhone. In android device it works fine.

I tested in different device but in iPhone it is a problem. I am expecting the background sync should continue even when the iPhone is in sleep mode or locked, like it is working for android device.