missing error event after the connection is interrupted and some media data has been received

• Component: Media
• Status: NEW ---

[Massimiliano Mura]

Summary: No error is fired after the connection is interrupted and some media data has been received, causing the user agent to give up trying to fetch the resource.

I've replicate the bug using the BBC Standard Media Player and with a basic HTML page too on iOS 12.3.1, iPhone 6s

To reproduce it, play a HLS video, go offline (I'm using Network Link Conditioner) and once the buffered video will finish to play you'll get a WAITING event and not a error one.

Thank you,
Massimiliano

[Radar WebKit Bug Importer]

<rdar://problem/51202282>

Created attachment 373010 [details]
Test case

I experienced the same issue in Safari 12.1.1 (macOS 10.14.5).

Test case
1. Open `test_case.html` in Safari
2. Press _Play_ button
3. Then PROGRESS events are fired
4. Turn off internet connection
5. Then STALLED and OFFLINE events are fired
6. Then "Failed to load resource: The internet connection appears to be offline".
7. Turn on internet connection
8. Then buffer is empty
9. Then the WAITING event is fired
10. Then playback hangs
11. Then the ERROR event is NOT fired


...finally the video element is broken. It's not possible to resume playback using play, pause or seek.

I would like to note that the behaviour was different in previous versions. Safari was able to resume loading content after connection was back:

1. Open `test_case.html` in Safari
2. Press _Play_ button
3. Then PROGRESS events are fired
4. Turn off internet connection
5. Then STALLED and OFFLINE events are fired
6. Then "Failed to load resource: The internet connection appears to be offline".
7. Turn on internet connection
8. Then the buffer is NOT empty
9. Then PROGRESS events are fired (loading content is back)
10. Then video continues to play