I.e. “Disable animations in all web pages (gracefully)”.
Now whether any sites actually make use of it is another matter. Also I don't know how the user would enable it. Perhaps an OS-specific, system-wide setting like dark mode.
https://developer.mozilla.org/en-US/docs/Web/CSS/@media/pref...
It would be so much better if browsers were User Agents and respected user settings before the will of the site creator.
In Apple products, it's exposed as an accessibility option:
macOS: https://support.apple.com/guide/mac-help/reduce-screen-motio...
iOS: https://support.apple.com/en-us/HT202655
tvOS: https://support.apple.com/guide/tv/reduce-screen-motion-atvb... (which also disables autoplaying previews!)
I think I have yet to see a webpage that uses animations in a way I enjoy, even when they’re smooth. (The same goes for most PowerPoint transitions and window manager animations...)
I would opt to stop letting web page authors just mangle my CPU cycles because they've opted to poorly animate an SVG or some HTML element. If anything I'd prefer each got a CPU budget and that was all they could use, unless they request more CPU time from the user, then voila! People who want to be annoyed can be, and the rest of us can go back to "browsing the web."
Personally I'd rather wait longer for things to complete than have my whole system grind to a halt because it starts swapping like crazy.