I'd argue that any serious production app should still be using both AppCache and Service Worker. Heck, if you have AppCache setup and working already, why woul

I'd argue that any serious production app should still be using both AppCache and Service Worker. Heck, if you have AppCache setup and working already, why would you remove it? Service Worker isn't supported by Internet Explorer, Safari, or Firefox ESR. Those browsers can account for a large portion of the market, depending on your target demographic. The <dialog> element is supported in even fewer browsers [0]! You can sorta polyfill it, but not perfectly. [0] http://caniuse.com/#feat=dialog http://caniuse.com/#feat=dialog