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I'm using Opera, with the option to discard all cookies from one session to the next. So, how does stackoverflow log me in automatically, if I didn't visit the site for several days?

Opera version:

Version 11.51
Build 1087
Platform Linux
System x86_64, 2.6.32-33-generic
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migrated from Sep 17 '11 at 21:34

This question came from our site for professional and enthusiast programmers.

how do you log in? openid, userpass? – mmatloka Sep 17 '11 at 20:25
Most likely this is done using HTML5 web storage. – Shadow Wizard Sep 17 '11 at 20:27

Stack Exchange uses HTML5 LocalStorage for its global network auto-login. This means that even if your cookies are removed, it will read your login token from LocalStorage, and automatically generate login cookies again.

We use HTML 5 Local Storage for global authentication, at our centralized domain Now, this does require a modern browser, though not unreasonably so: IE8+, Chrome, Safari, FireFox 3.6+, and Opera 10.61+ are all supported.

You can read all about the technical background in this meta post.

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