chrome: disable internet connection or work offline
offline mode is added to Chrome v45.
Developer tools -> Network tab -> Choose "offline" from selectbox.
Offline switcher is a new handy Chrome Extension to do the job quickly. You can toogle to switch between offline and online mode.
The add-on is simple, just to set Chrome proxy to an un-existing point.
Google chrome doesn't have this feature.
This has been requested by many users. Take a look at productforums.google.com
you can raise your request in the above link.
Refer to the latest answer:https://stackoverflow.com/a/32607960/2520254