This will also work when the site&#x27;s servers are down. It serves offline content from the local cache if the original fetch fails - it can fail either due to your device&#x27;s connection, the server, or anything in between.<p>However, since offline content is served <i>after</i> trying the network, it&#x27;s still going to be slow in flakey network conditions as you wait for the original request to either succeed or give up.