Originating from bug 245156

I tried to do all changes in one go and got quite a lot of failures and difficult to manage them, so I am going to separate them one by one and land them.

It would be easier to manage for me and this is about this one below:

3) fieldset element needs to change to "min-inline-size: min-content;" from "min-width: min-content;"

https://html.spec.whatwg.org/#the-fieldset-and-legend-elements

In case, if I am not able to do it and had to close my PR, I will share details on genuine test failures or why this is no go at the moment for Webkit so someone else can take a look in future.

Thanks!