Reading/Web/Accessibility for reading/dev/Cross language font size considerations

The following is a summary of T340848 where we investigate what types of adjustments we should make to font-size on a per-language basis. We draw on previous work done at the foundation as well as expert opinion.

Wikipedia's that change their default font-size
The following is a list of language wikipedia's that change the font-size of their content. The "computed font-size" refers to the final output size of a paragraph of content, with default browser settings, as an anonymous user.

Arabic
Computed font-size: 14px

Modification source: https://ar.wikipedia.org/wiki/%D9%85%D9%8A%D8%AF%D9%8A%D8%A7%D9%88%D9%8A%D9%83%D9%8A:Vector.css#L-16

modification code: For reasons unknown, maybe related to T312966 this font-size may have been modified at one point but has been set to, which has no effect on the computed font-size.

Chinese
Computed font-size: 15.008px

Modification source: A gadget that's enabled by default for all users: https://zh.wikipedia.org/wiki/MediaWiki:Gadget-large-font.css

modification code:

Japanese
Computed body font-size: 15.104px

Modification source: https://ja.wikipedia.org/wiki/MediaWiki:Vector.css

Modification code:

Urdu
Computed font-size: 16.94px

Modification source: unknown

Tibetan
Computed font-size: 17.5px

Modification source: https://bo.wikipedia.org/wiki/MediaWiki:Vector.css

Modification code: