Why offline web application doesn't work?
It looks like offline app is supported on most browsers. I copied the example app from WHATWG and put it on an web server but it didn't work when I test with the steps below: browse to clock.html with windows phone 8.1 (IE 11) page looks fine, then exit the browser disable wifi and cell data browse to the clock.html again but get Cannot find server or DNS error I was not browsing in private mode and did not clear any browser cache. I don't know if this is specific to windows phone yet, but will test with other devices later. clock.appcache CACHE MANIFEST CACHE: clock.html clock.css clock.js