[upstream] CKEditor 5 not asking confirmation before closing or reloading tab

I do not understand what this bug report means.

Can you provide some screenshots of what you were expecting to see?

Please check attached image.
When you do edit in the node and make the changes to the node body where the Creditor available and try to refresh the page, it is not asking me the Reload Page? browser popup.
I will make video and post for more information.

I don't ever recall seeing that functionality, in CKE4 or 5.
Are you sure it wasn't provided by custom code or a module?

That's indeed browser behavior, not CKEditor 4/5-specific logic.

I do think it's fair to expect CKEditor to be working in such a way that it protects the user against data loss.

And I think it's because the <textarea> is not updated until the user hits "Save".

Verify this yourself using document.querySelector('textarea#edit-body-0-value').value: it remains the empty string. I suspect this behaved differently in CKEditor 4.

We should report this upstream — I can't find an existing issue for it: https://github.com/search?q=repo%3Ackeditor%2Fckeditor5+changes+may+not+...