[css-cascade-5] Make note understandable to people who don't know about the “container query” proposal. #64907

Author: fantasai

css-cascade-5/Overview.bs

@@ -1515,15 +1515,17 @@ Layer Ordering</h4>
 	</div>
 
 	Layers that are defined inside of a [=conditional group rule=]
-	do not contribute to the layer order unless the condition is true,
-	or unless the [=conditional group rule=] evaluates contextually
-	for different elements on the page.
-
-	Note: A feature like "container queries"
-	would need to evaluate contextually for individual elements.
-	Because of that, layers defined inside a container query
-	would be considered part of the global layer order
-	regardless of the condition.
+	do not contribute to the layer order unless the condition is true
+	or unless the [=conditional group rule=] can evaluate differently
+	for different elements in the document.
+
+	Note: Since the layer order is global to the document,
+	any layers defined inside an element-sensitive [=conditional group rule=]
+	need to be accommodated when establishing the global layer order,
+	regardless of the rule's condition.
+	Conditions that are global to the document, however
+	(such as ''@media'' and ''@supports'')
+	can accommodate such ''@layer'' rules conditionally.
 
 	<div class=example>
 		For example,