@Toastie I've come to the conclusion that anything more than static content is just going to be abused to harass the users. Even supposedly "declarative" features like CSS animations.
Give me static HTML or some structured data and let my client decide how/if to present it.
Come to think of it, that's one reason I love #scuttlebutt: the apps are just displaying data. No fuss, no mess, no harassment.