## Reference

### applicationCache checking

    if (window.applicationCache) {
      // "Naturally" reload when an update is available
      var reload = false

      window.applicationCache.addEventListener('updateready', () => {
        if (window.applicationCache.status === window.applicationCache.UPDATEREADY) {
          window.applicationCache.swapCache()
          reload = true
        }
      }, false)

      setInterval(() => {
        try {
          // There's nothing to update for first-time load, browser freaks out :/
          window.applicationCache.update()
        } catch (e) { }
      }, 1000 * 60 * 60) // Every hour
    }

This is a deprecated HTML feature. See: Using the application cache (developer.mozilla.org)

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