[css-position-3] Parallel notes wrt properties that create containing blocks. <https://lists.w3.org/Archives/Public/www-style/2020Apr/0021.html>

Author: fantasai

css-position-3/Overview.bs

@@ -329,10 +329,9 @@ Containing Blocks of Positioned Boxes</h3>
 			the [=absolute positioning containing block=] is 
 			the [=initial containing block=].
 
-			Note: The 'position' property causes an element to establish an [=absolute positioning containing block=]
-			for any value other than ''static'';
-			other properties, such as 'contain',
-			can also do so.
+			Note: Properties that can cause a box to establish
+			an [=absolute positioning containing block=] include
+			'position', 'transform', 'will-change', 'contain'&hellip;
 
 		<dt id="fixed-cb">If the box has ''position: fixed'':
 		<dd>
@@ -346,6 +345,10 @@ Containing Blocks of Positioned Boxes</h3>
 			the [=viewport=] in the case of [=continuous media=],
 			or the [=page area=] in the case of [=paged media=].
 			See [[#fixpos-insets]].
+
+			Note: Properties that can cause a box to establish
+			an [=fixed positioning containing block=] include
+			 'transform', 'will-change', 'contain'&hellip;
 	</dl>
 
 <div class="example">