Safari HTML5 offline problem - html

I am trying to run a script that supports for HTML5 offline working. It works fine in Firefox but not in safari. I want it to work in safari too. You can see here.
http://vps.sunztech.com/clock.html
HOW TO CHECK OFFLINE WORKING: open the URL when internet is connected.close the browser after loading all contents. now disable internet and load that URL again it should show the the data from cache.
The above is working fine in Firefox but not in Safari.
May anyone can give me the solution...
I will be thankful

Make sure that the manifest file is served as type text/cache-manifest. There are several other guidelines worth checking in Apple's developer documentation for iPhone and Mobile Safari.

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There's even a ticket on that package from people complaining about the same issue, but with no solution.
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pleaseeee Help would be highly appreciated. Thanks.
Try to update your browsers and check if proxies are working perfectly.
Try to clean catches.
I have used opera, safari, chrome, internet explorer, Microsoft edge, Firefox and some other browsers on Linux, Windows and Mac OS. But I didn't find such problem even I have explored Github Pages on these browsers.
Probably, The problems may be with proxy or some network settings. Check your firewall as well. If these solutions don't work, try to update your Operating System.
Thank You
try to clear your cache browser
this can fix
open cmd
ipconfig/flusdns
ipconfig/release
ipconfig/renew
restart your pc
restart your router/wifi hub/etc......
enter your desired site

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