[css-contain-3] Clarify style queries of shorthand values w3c#7095

Author: mirisuzanne

css-contain-3/Overview.bs

@@ -882,6 +882,10 @@ Style Container Features</h3>
 	is the same as for [=CSS feature queries=].
 	(See ''@supports''. [[!CSS-CONDITIONAL-3]])
 
+	[=Style features=] that query a [=shorthand property=] are true if the
+	[=computed values=] match for each expanded [=longhand property=],
+	and false otherwise.
+
 	[=Cascade-dependent keywords=], such as ''revert'' and ''revert-layer'',
 	are not allowed as values in a [=style feature=], and cause the
 	[=container style query=] to be false.
@@ -1022,6 +1026,8 @@ Changes since the 21 December 2021 First Public Working Draft</h3>
 
 	Significant changes since the <a href="https://www.w3.org/TR/2021/WD-css-contain-3-20211221/">21 December 2021 First Public Working Draft</a> include:
 
+	* Clarify handling of [=shorthand properties=] in [=container style queries=].
+		(<a href="https://github.com/w3c/csswg-drafts/issues/7095">Issue 7095</a>)
 	* [=Cascade-dependent keywords=] are not allowed as values in a
 		[=style feature=], and cause the [=container style query=] to be false.
 		(<a href="https://github.com/w3c/csswg-drafts/issues/7080">Issue 7080</a>)