To me it’s a demonstration of why this is a holy grail and best metered with a layered approach that tries to compensate with the assumption to designer (or some future designer) will come along and fail to account for something – and that they lack the required psychic powers to foresee future browser behaviours.

In other words: don’t rely on dynamic functionality until you already have a fallback in place… or you end up with testimonials regurgitated over your whole site =)