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IIRC, service workers allow you to intercept all requests made by the page, for the purposes of implementing offline caching.

• comboy 10y ago
  Right, but you need to execute some JS to set them up, and the example only shows img tag.
  • detaro 10y ago
    No, the Link-tag with rel=serviceworker on the image response installs the service worker. Not clear (to me) if that's part of the origin trial or not.
    • comboy 10y ago
      That seems to be the case, it seems really weird that it's allowed though, especially from a different domain.
    • youngtaff 10y ago
      The link tag with rel=serviceworker behaviour here is part of 'Foreign-Fetch' - an experiment too allow third-parties to install a serviceworker e.g. analytics provider could install a SW that handles analytics offline so a developer doesn't need to. I think the origin-trial for this expires early next year. https://developers.google.com/web/updates/2016/09/foreign-fetch https://developers.google.com/web/updates/2016/09/foreign-fe... https://groups.google.com/a/chromium.org/forum/#!topic/Blink-dev/sIzHpZVhmBE https://groups.google.com/a/chromium.org/forum/#!topic/Blink...