Safari - Reload Page from Origin, does what exactly? If you hold cmd and click View -> Reload Page From Origin what does that do exactly and how does it differ from a standard reload?

I'm guessing it reloads the current page without using cache? But i'm not sure. I hope some one can confirm this.
This loads the page and any same-domain resources requested by the page without using the cache. Resources located on other domains may still use the cache. You can completely bypass the cache using the Network tab of the Web Inspector as just ⌥⌘R is insufficient.