Dear WT, The perennial discussion about ways to provide logged-out users with persistent customization of their reading experience in the browser has cropped up again in the context of the pending deployment of Vector 2022. Can a cookie-based width toggle <https://en.wikipedia.org/wiki/Wikipedia:Requests_for_comment/Deployment_of_Vector_(2022)#Alt_proposal:_gradual_changeover_+_width_toggle> be offered without splitting the cache or otherwise making the toggler regret their tog? The answers currently range from "*shouldn't be very complicated or hacky, just toggling a class*..." and "*can be delivered to logged-out users on top of the cached parser output*.." to "*impossible*". Could someone clarify the challenges and costs of trying to toggle css classes in this way? Warmly, SJ -- Samuel Klein @metasj w:user:sj +1 617 529 4266