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Make max-width toggle persistent for anonymous users
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In T319449 we will create a toggle for switching between max width and non-max-width mode. Initially this will only persist for logged in users. We hit a similar problem with T246427 but decided in that case it was not worthwhile adding code for one preference however as the web interface has evolved, a generalized solution would be very valuable.

We should explore generalizing a way for certain features to be set on the client side using localStorage and a small inline script that reads localStorage prior to rendering. I've sketched out a proof of concept at

It's hoped in future this generalized code could be used to support the following future features:

  • Dark mode
  • Font-size changing

Possibly with some refactoring:

  • Table of contents collapse behaviour
  • Sidebar state (previously explored in T246427)