In safari in my Mac:

Comparison of Google Site using a Gadget (Code Wrapper) with HTML inside (basically the code that is used can be found here: http://www.google.com/support/forum/p/sites/thread?tid=2e29914e2b464a23&hl=en)

On the left you can see the page rendered with Safari 5+ and on the right with Chrome for Mac:

Safari is not only missing the Video player (Gadget with Flash) but also the Gadget with the HTML.