On a Mac everything is supposed to “just work”, and usually it does. However, sometimes a missing internet plug-in or other component may be required for correct operation:
I have been a Mac user since the first home/small Mac computers were available. My recent eMac was 9 years old, so I was out of sync with EVERYTHING. Just bought a new iMac and I have Safari. Sometimes I click on a document on the Internet, and I get a basically blank page that says “Missing plug-in.” So I can’t open everything I need.