Who should handle text spacing?

[sajkaj]

Detlev Fischer on October 14 commented on:
[https://w3c.github.io/wcag/conformance-challenges/#challenge-4-non-web-information-and-communications-technologies](Challenge #4)
Another one: 1.4.12 Text spacing looks like something that should be dealt with not by the individual app/author but by the OS in its general accessibility settings, and may then only apply to scalable/system text.
It is hard to see how 1.4.12 should equally apply to each and every text in apps, including toolbar / navigation (compare AGWG decision #620 (comment)) considering the
space contraints.
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Peter Korn on October 15 commented:
Detlev - agreed. Can I invite you to draft text for 1.4.12 in this section?

[sajkaj]

Added Appendix A.15: "Text Spacing".