Preflight Checklist

• I have read the Contributing Guidelines for this project.
• I agree to follow the Code of Conduct that this project adheres to.
• I have searched the issue tracker for a bug report that matches the one I want to file, without success.

Electron Version

26.2.1

What operating system are you using?

Windows

Operating System Version

Windows 10

What arch are you using?

x64

Last Known Working Electron version

No response

Expected Behavior

Electron has background sync disabled. Background sync is used to trigger the service worker to sync changes. It helps to sync work which was done by user when he was offline. Would be good to enable it by default. It is enabled by default in chromium and chrome.
On page with service worker registered, this snippet should produce no errors.

navigator.serviceWorker.ready.then(function(swRegistration) {
  return swRegistration.sync.register('myFirstSync');
});

This issue was raised at #9802
It is unclear to me why #9802 was merged with #6697. The other issue is about Web Push, which is distinct from Background Sync.
Also, the #6697 was closed without a fix to the Background Sync problem #9802 .

Actual Behavior

When run with electron, I get

Uncaught (in promise) DOMException: Background Sync is disabled.

Testcase Gist URL

No response

Additional Information

How to reproduce
Open youtube.com with electron

OR

git clone https://github.com/hokein/electron-sample-apps
cd electron-sample-apps
npm install -g electron
electron service-worker/mock-response
Open the console and type in the snippet:

navigator.serviceWorker.ready.then(function(swRegistration) {
return swRegistration.sync.register('myFirstSync');
});
It gives the error in electron. Use the same snippet in youtube on the browser, it runs fine.

This is the same bug as #31063 which is closed as not planned the issue still exists with electron v 26.2.1