add negative margin case to margin-box

w3c · Oct 15, 2019 · 6792d49 · 6792d49
1 parent 4c8379a
commit 6792d49
Showing 1 changed file with 4 additions and 2 deletions.
diff --git a/css-shapes-1/Overview.bs b/css-shapes-1/Overview.bs
@@ -760,10 +760,12 @@ Shapes from Box Values</h2>
 	enclosed by the outside margin edge.
 	The corner radii of this shape are determined
 	by the corresponding border-radius and margin values.
-	If the ratio of <code>border-radius/margin</code> is 1 or more,
+	If the ratio of <code>border-radius/margin</code> is 1 or more, 
+	or margin is negative, 
 	then the margin box corner radius is
-	<code>border-radius + margin</code>.
+	<code>max(border-radius + margin, 0)</code>.
 	If the ratio of <code>border-radius/margin</code> is less than 1,
+	and margin is positive, 
 	then the margin box corner radius is
 	<code>border-radius + (margin * (1 + (ratio-1)^3))</code>.