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This is most likely a website keeping the same data in HTML5 web storage, flash cookies or other, and when noticing one of them has been removed, repopulating them. These are also sometimes called super, zombie or persistent cookies.

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Hold on. The setting is called “keep local data only until you quit your browser”. Not “local cookies”. And that’s always how I expected it to work. If it preserves data from web storage or others than this is either a massive fuck up or a disingenuous placebo setting.

I believe handling of Flash cookies is completely outside the browser.

Flash is bundled with and sandboxed by Chrome.

And disabled by default, too.

Isn't local data a superset of local cookies?

It seems it was kept in IndexedDB, but Chrome was only cleaning it up when you closed it and not when you closed all its windows (I didn't even know there was a difference).

https://bugs.chromium.org/p/chromium/issues/detail?id=750452...

There is on macOS, (for all 'apps', not just Chrome) but not, I think, on any other platform.

I don't know why anyone feel anything more than indifference about it; I find it annoying.

I used to use a tool (I think it was called RedQuits) that implemented the windows closed -> app quit behaviour.

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