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I have been using Axios for my last few projects, and been pretty happy with it, but less dependencies is always better!
I wish fetch's api required less boilerplate, I would only use fetch too.
Interesting concept, could help many junior developers, who are not designers, choosing better default styles, especially for accessibility.
A couple remarks though :
1) many of these answers are completely subjective.
Why is an input field with border-radius better than a squared inputs? It's totally up to your design system (e.g. https://designsystem.digital.gov/components/form-controls/)
2) for each answer it would be great to back it up with MDN pages, or sources, explaining why it is the good answer or not. Again, might be hard since many answers are subjective.
3) Would be great to add an "about" section to the page, so we know what this is about, who you are, etc.
I hope that helps :)