Three faults in one paragraph. It never left: a confirmation is an EVENT, and rendering it as page content claims the page CONTAINS the fact of having been saved, which is only true for a moment. A reload replayed it: ?saved=1 stays in the address bar, so a refresh — or a bookmark — congratulated the reader for a save from hours ago. And it shifted the layout under the button just pressed.

A one-shot cookie now carries the word across the redirect and is spent on arrival, so the URL stays clean and the second render is silent. The lifetime is CSS: it holds four seconds, then fades AND collapses, so no empty paragraph is left behind. Not script — this page must behave the same without JavaScript, and an animation costs nothing when the script is absent. role=status announces it on insert, before any of that runs.

Reduced motion keeps the message and drops the animation: someone asking for less movement is not asking to be told less. check-in: 563eb933dd user: dmestas tags: trunk