How can websites know that I'm offline? The 2019 Stack Overflow Developer Survey Results Are...

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Relations between two reciprocal partial derivatives?

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How can websites know that I'm offline?



The 2019 Stack Overflow Developer Survey Results Are In
Announcing the arrival of Valued Associate #679: Cesar Manara
Planned maintenance scheduled April 17/18, 2019 at 00:00UTC (8:00pm US/Eastern)Why does Apache server only work if I have an Internet connection?How to select which network adapter Firefox should use for specific sitesHow does windows (7 in my case) knows that I'm “connected to the internet”?How can I protect a PC that is directly connected to the Internet?How can I find out why the internet connection speed in our LAN is so slow?Installing Windows Update kills my internet connectionHow to prefer mobile connection over proxy?How do I diagnose a stuttering network connection?Firefox won't navigate to site on localhost when internet connection is brokenHow to know if I'm having WiFi micro-cuts?





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If there is no internet connection to a site, then how can they display this message?



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If there is no internet connection to a site, then how can they display this message?



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    apress.jensimmons.com/v5/pro-html5-programming/ch12.html

    – user726730
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  • 1





    apress.jensimmons.com/v5/pro-html5-programming/ch12.html

    – user726730
    yesterday








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apress.jensimmons.com/v5/pro-html5-programming/ch12.html

– user726730
yesterday





apress.jensimmons.com/v5/pro-html5-programming/ch12.html

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