The browser checks by downloading offline.appcache each time you browse to the page or refresh it. It won't check at any other time. Do you need it to?
If the contents of offline.appcache has changed, it will then proceed to check every file in the appcache (every file in the project). However the ordinary browser cache is still in use as it does this, so any files that have not changed it should not need to download again.Ashley2013-08-14 14:08:21