Pop-up blockers prevent unwanted web pages from appearing on your screen while browsing the internet. However, sometimes necessary pop-ups are blocked by the system. The pop-up blocker can be disabled for certain sites. This article gives instructions on how to turn on/off the Pop-up Blocker and how to allow pop-ups for specific websites on Safari.
Safari does not have an "allowed sites" function. To enable popups only for certain websites in Safari, you will have to turn off the pop-up blocker while on the site and turn it on again when leaving the site.