The Ars redesign 9.0.2 brings the text options you've requested
Briefly

In version 9.0.2 of the Ars Technica redesign, users can now select font sizes, access colored hyperlinks, and enjoy a new layout emphasizing information density.
The new font size selector allows for Small, Standard, and Large options, and offers a subscriber-only Wide option for those valuing increased information density.
Read at Ars Technica
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