[css-flexbox-1][css-grid-1][css-grid-2] Check computed overflow instead of scroll container-ness #7714

Author: fantasai

css-flexbox-1/Overview.bs

@@ -955,7 +955,7 @@ Automatic Minimum Size of Flex Items</h3>
 
 	To provide a more reasonable default <a>minimum size</a> for <a>flex items</a>,
 	the used value of a <a>main axis</a> <a>automatic minimum size</a>
-	on a <a>flex item</a> that is not a <a>scroll container</a>
+	on a <a>flex item</a> whose [=computed value|computed=] 'overflow' value is [=non-scrollable overflow value|non-scrollable=]
 	is its [=content-based minimum size=];
 	for <a>scroll containers</a> the <a>automatic minimum size</a> is zero, as usual.
 

css-grid-1/Overview.bs

@@ -1283,7 +1283,7 @@ Automatic Minimum Size of Grid Items</h3>
 	the used value of its <a>automatic minimum size</a> in a given axis
 	is the <a>content-based minimum size</a> if all of the following are true:
 
-	* it is not a [=scroll container=]
+	* its [=computed value|computed=] 'overflow' is not a [=scrollable overflow value=]
 	* it spans at least one [=track=] in that axis
 		whose <a>min track sizing function</a> is ''grid-template-rows/auto''
 	* if it spans more than one track in that axis, none of those tracks are [=flexible track|flexible=]
@@ -5375,6 +5375,14 @@ Minor Changes</h4>
 			<wpt>
 			layout-algorithm/grid-intrinsic-track-sizes-001.html
 			</wpt>
+
+		<li id="change-2020-auto-min-size-overflow">
+			Pin [=automatic minimum size=] conditional on [=computed value=] of 'overflow'
+			rather than on being a [=scroll container=]
+			to avoid cases such as [=replaced elements=]
+			whose computed [=scrollable overflow values=] resolve to
+			[=non-scrollable overflow values|non-scrollable=] [=used values=].
+			(<a href="https://github.com/w3c/csswg-drafts/issues/7714">7714</a>)
 	</ul>
 
 <h4 id="clarify-2017">

css-grid-2/Overview.bs

@@ -1342,7 +1342,7 @@ Automatic Minimum Size of Grid Items</h3>
 	the used value of its <a>automatic minimum size</a> in a given axis
 	is the <a>content-based minimum size</a> if all of the following are true:
 
-	* it is not a [=scroll container=]
+	* its [=computed value|computed=] 'overflow' is not a [=scrollable overflow value=]=]
 	* it spans at least one [=track=] in that axis
 		whose <a>min track sizing function</a> is ''grid-template-rows/auto''
 	* if it spans more than one track in that axis, none of those tracks are [=flexible track|flexible=]
@@ -5528,6 +5528,14 @@ Changes since the <a href="https://www.w3.org/TR/2020/CRD-css-grid-2-20201218/">
 			and grid track sizing.
 			See [[#layout-algorithm]].
 			(<a href="https://github.com/w3c/csswg-drafts/issues/3418">Issue 3418</a>)
+
+		<li id="change-2020-auto-min-size-overflow">
+			Pin [=automatic minimum size=] conditional on [=computed value=] of 'overflow'
+			rather than on being a [=scroll container=]
+			to avoid cases such as [=replaced elements=]
+			whose computed [=scrollable overflow values=] resolve to
+			[=non-scrollable overflow values|non-scrollable=] [=used values=].
+			(<a href="https://github.com/w3c/csswg-drafts/issues/7714">7714</a>)
 	</ul>
 
 <h3 id="changes-202008">