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
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