We just discovered that WebKit does not support DOMAttrModified-Events which are part of the DOM Level 2 Event Model. We utilizes those events to monitor changes in DOM-elements and therefore attribute updates (like in the jQuery example) do not work in Safari and Google Chrome right now. It is even a known bug in the WebKit-bug tracker since 2006-04-04.
We are really shocked since our synchronize architecture depends on DOM Level 2 events and they work perfectly in Firefox and Opera for years.
The only workarounds we can think of right now would be really nasty and slow.