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When I access tagged stackoverflow page and leave it there for a while, I will get notified from my browser's tab if a new question has arrived. In the tab, it will be a number between parentheses as in (2) for 2 new questions since I first accessed the page.

Which technology is being used to send those notifications without a page reload?

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explained in this meta post - New Feature: real time updates to questions, answers, and inbox –  Lix Dec 24 '12 at 19:20
    
Also here is a list of all the technologies used on the network. –  Lix Dec 24 '12 at 19:21

1 Answer 1

JavaScript, baby.

It simply updates the title of the page after polling using AJAX to see if there were changes. Chances are that this will change in the future to use WebSockets, if it isn't doing so already.

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+1 for JavaScript, baby. –  NullPoiиteя Dec 24 '12 at 20:06

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