'Time to go offline' what is the best technologies to start? [on hold]

If I am familiar with 'angularjs','jQuery' and chrome features like push notifications and service worker.Is it necessary to use a framework or we can use native HTML5 and CSS3. The best way to get is with service worker a chrome features . Here are some questions that might help you to answer my question: What makes offline applications different from online application? What technologies are used for this approach? Does using framework increases efficiency?