[css-anchor-position-1] Clarify writing-mode for try tactics. #12869

Author: fantasai

css-anchor-position-1/Overview.bs

@@ -1573,6 +1573,8 @@ Values have the following meanings:
 		If multiple keywords are given,
 		the transformations are composed in order
 		to produce a single [=position option=].
+		Logical directions are resolved against
+		the [=writing mode=] of the [=containing block=].
 
 	: <dfn><<dashed-ident>> || <<try-tactic>></dfn>
 	::
@@ -2613,5 +2615,7 @@ Significant changes since the <a href="https://www.w3.org/TR/2025/WD-css-anchor-
 * Define ''anchor-center'' to also use the [=scrollable containing block=]
 	so that it doesn't trigger overflow alignment when positioned outside the [=local containing block=].
 	(<a href="https://github.com/w3c/csswg-drafts/issues/12952">Issue 12952</a>)
+* Clarify that ''flip-block'', ''flip-inline'', and ''flip-start'' use the [=writing mode=] of the [=containing block=].
+	(<a href="https://github.com/w3c/csswg-drafts/issues/12869">Issue 12869</a>)
 
 See also <a href="https://www.w3.org/TR/2025/WD-css-anchor-position-1-20251007/#changes">Previous Changes</a>.