title: Does a service worker cache work site-wide, even without loading an HTML with sw.js?
body: <p>Does a service worker cache work site-wide, regardless whether the user is actually  on an HTML page that has sw.js loaded?</p>
  
  <p>For example:
  Assuming...</p>
  
  <ul>
  <li>A registered service worker on the users’ browser</li>
  <li>With a local cache controlled by the sw</li>
  <li>The local cache has a few files cached including html, js, css and some jpg’s</li>
  </ul>
  
  <p>If the user were to directly visit any of those JPG or CSS files in their browser, does the browser run the request through the service worker and/or on it’s own recognize those local files, and thus render the locally cached file?</p>