Rollup merge of #79379 - GuillaumeGomez:no-js-not-hidden, r=Nemo157

Rollup merge of #79379 - GuillaumeGomez:no-js-not-hidden, r=Nemo157

Show hidden elements by default when JS is disabled

Fixes  #79301.

A lot of things are hidden by default which shouldn't when JS is disabled. This PR fixes it.

Before:

![Screenshot from 2020-11-24 14-10-16](https://user-images.githubusercontent.com/3050060/100099361-a16d5580-2e5f-11eb-891b-a4c005aeb1d0.png)

After:

![after](https://user-images.githubusercontent.com/3050060/100099382-a6caa000-2e5f-11eb-8190-14f330aff9a2.png)

r? `@jyn514`