Re: [w3ctag/design-reviews] CSS Overflow Navigation Controls (Carousels) (Issue #1037)

matatk left a comment (w3ctag/design-reviews#1037)

Hi again @flackr, and thanks for your update. We have some thoughts on it, and as there are a number of related threads and proposals here, we wanted to bring these together into one comment here.

Thank you for updating your implementation to prevent un-inerting; that is a positive change. Also we and APA WG are pleased to see that the [prevention of un-inerting has made it into the harmonisation PR on HTML](https://github.com/whatwg/html/pull/10956#issuecomment-2884388886).

That being said, whilst considering the related developments in this area, we still have several concerns expressed above, and some additional recommendations:

1. It seems that [scroll markers would be used to impart roles to elements on the page](https://github.com/w3c/csswg-drafts/issues/12122#issuecomment-2920507737), and the nature of those roles would vary depending on whether the CSS author choses `discrete` or `navigation`. Setting roles via CSS is a fundamental expansion of what CSS is doing.

   We do not think this is an appropriate use of CSS, and would encourage you to investigate the [Cascading Attribute Sheets](https://gist.github.com/tabatkins/4074abaf486af5b3f7ac289737e216e4) proposal, for this and future work. This seems like an effective way to address the general need, whilst maintaining separation of concerns.

2. What advice would be given to developers to help them decide whether the 'tabs' or 'links' semantics are more important?

Given particularly the first of these issues, we are still concerned about the addition of these features to the platform, particularly in their current form. We are keen to hear your thoughts on them.

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