Clarification needed on Target Size in mobile context.

[youngheek]

To what extent do mobile touchscreen error correction mechanisms (like touch sensitivity or system-level expansion) influence compliance with WCAG 2.1 Success Criterion 2.5.5 (Target Size: minimum 44x44 CSS pixels)? Specifically, can these OS-level touch tolerance features be considered a mitigating factor for the target size requirement?

[GreggVan]

Only if you can guarantee that your web pages will never be looked at by anyone on any computer or other device that does not have that feature.

That is - you cannot rely on user agents to meet your requirements unless you know that essentially all user agents will have that feature or capability.

So for all practical purposes -- the answer to the case you pose is no.

[youngheek]

Thank you for your clear answer.