I recently stumbled about a plugin to make A/B split tests. The plugin can be found at https://absplittest.com/.
All tests methods also work with Cornerstone, but the “On Page Elements” test is a bit of a hassle because one have to do it manually by adding classes to the desired elements. The plugin supports some other builders (eg. Elementor, Oxygen, Breakdance) by adding advanced options to their elements.
I wonder, if that could be also possible for Cornerstone elements e.g. by collaborating with the devs of the plugin I mentioned above.
Or in the best case as a built-in feature of Cornerstone, lovely handcrafted by theme.co
But that probably needs a lot of extra work because this A/B test feature will require to record and evaluate statistics, and should also be compatible with different caching solutions.
just dreaming
Mirco