[css-anchor-position-1] Compensating for Scroll & `overflow: clip` in one axis

[dshin-moz]

Currently, we compensate for scroll if anchor() refers a default anchor, or an anchor that has the same scroll container.

However, if we have e.g.

<div class=scroller>
  <div class=default-anchor style="anchor-name: --default;"></div>
  <div class=another-scroller style="overflow-x: scroll; overflow-y: clip;">
    <div class=another-anchor style="anchor-name: --another;"></div>
  </div>
  <div class=positioned>
</div>

and .positioned has position-anchor: --default; top: anchor(--another, bottom);, no scroll compensation is currently done in that axis, I imagine because overflow-x: scroll makes .another-scroller a scroll container.

Still, seems a bit odd that we won't compensate for scroll, even if --default and --anchor would scroll together?

(Testcase attached)
anchor-scroll.html

[fantasai]

Were looking at this bit in the spec, right?

at least one anchor() function on abspos’s used inset properties in the axis refers to a target anchor element with the same nearest scroll container ancestor as abspos’s default anchor box.

So what you're saying is that this shouldn't say "nearest" but "ancestor"?