[css-anchor-position] Added 'inset-area()' to position-try-options. w3c#9270

Author: tabatkins

css-anchor-position-1/Overview.bs

@@ -1005,7 +1005,7 @@ Giving Fallback Options: the 'position-try-options' property {#position-try-opti
 
 <pre class=propdef>
 Name: position-try-options
-Value: none | [ <<dashed-ident>> || <<try-tactic>> ]#
+Value: none | [ [<<dashed-ident>> || <<try-tactic>>] | inset-area( <<'inset-area'>> ) ]#
 Initial: none
 Inherited: no
 Applies to: [=absolutely-positioned=] elements
@@ -1097,6 +1097,12 @@ Values have the following meanings:
 		to the element's [=position options list=].
 
 		Otherwise, does nothing.
+
+	: <dfn>inset-area( <<'inset-area'>> )</dfn>
+	::
+		Automatically creates a [=position option=]
+		composed solely of an 'inset-area' property
+		with the given value.
 </dl>
 
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