Your browser should have a 'no style' option tucked away somewhere. Presentation is - according to the original web spec, not the present monstrosity - mostly the job of the client.
Isn't "reader mode" available on some browsers almost a "no style" option? I use it exactly for that reason. I admit not every page is reader-mode-enabled but I just don't bother with those.
In Firefox, you can select View > Page Style > None.