[css-anchor-position-1] Mark various open issues

Author: fantasai

css-anchor-position-1/Overview.bs

@@ -1279,8 +1279,11 @@ depending on some commonly needed layout conditions.
 	or other effects (such as [=paint containment=])
 	that clip to the [=overflow clip edge=].
 
+	ISSUE(12732): Define timing of visibility checks.
+	<!--
 	Whether or not |anchor| is [=clipped by intervening boxes=]
 	is determined immediately prior to triggering {{ResizeObserver}}s.
+	-->
 
 	Note: This means that if an abspos is next to its anchor in the DOM,
 	for example,
@@ -2079,6 +2082,11 @@ so they affect [=computed values=]
 (and can trigger transitions/etc)
 even though they depend on layout and [=used values=].
 
+ISSUE: Rewrite this section to be less confusing and more correct.
+See <a href="https://github.com/w3c/csswg-drafts/issues/12818">Issue 12818</a>,
+<a href="https://github.com/w3c/csswg-drafts/issues/12890">Issue 12890</a>,
+<a href="https://github.com/w3c/csswg-drafts/issues/12653">Issue 12653</a>.
+
 <div algorithm>
 	To <dfn>apply a position option</dfn> to a box's element |el|,
 	given a [=position option=] |new styles|: