[…] the online version of Cam Banks’ Cortex Prime rules put out by Fandom. Can players read, learn and reference a complex ruleset presented in hyperlinks?

To be honest, the online version of Cortex is disappointing. It’s very badly optimized, heavy and laggish even on a laptop, and almost unusable on a phone. Its TOC is badly designed, with the hierarchical structure not very easy to see, and no way to collapse the nodes.

As a counter-example, fate-srd.com is bland and plain-looking, but it’s waaaaay more usable. Everybody should copy it.