The cakePHP website uses (almost) white font on white background, doesn't work in Reader mode, and many links point to 404s (eg: https://api.cakephp.org/4.3/namespace-Controller.html)... Is it still maintained?
What browser are you having problems with in reader mode?
about:reader?url=https://cakephp.org/
Failed to load article from page
about:reader?url=https://monicalent.com/blog/2019/06/03/absolute-truths-unlearned-as-junior-developer/