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ArtOfCode's answer covers true A/B testing, which involves a randomised experiment and the system to support it. However, the question sounds as if it is also considering the ability for individua...
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#1: Initial revision
[ArtOfCode's answer](https://meta.codidact.com/posts/290743/290753#answer-290753) covers true [A/B testing](https://en.wikipedia.org/wiki/A/B_testing), which involves a randomised experiment and the system to support it. However, the question sounds as if it is also considering the ability for individual users to choose how to see the site: > ... in case people want to see what the site would be like with some change in design ... This could potentially take much less developer support than full A/B testing, as there is no random selection of which users to show the new design, especially if there is no record kept of how users interacted with it. If the change being considered is solely a front end change (no change to the code running on the server, just changing what the browser displays to the user) then users are free to experiment with [userscripts](https://en.wikipedia.org/wiki/Userscript), which require no developer support. For example, there is not yet developer support for implementing and maintaining a dark mode, but a couple of people (one of them me) have posted [scripts that users can use to modify the colour scheme in the meantime](https://meta.codidact.com/posts/275838).