[css-images-4] Add conic-gradient() issues

Author: LeaVerou

css-images-4/Overview.bs

@@ -636,7 +636,13 @@ Conic Gradients: the ''conic-gradient()'' notation</h3>
 	</dl>
 
 	<p class='issue'>
-		Anything else that might be useful?  Defining the shape of the gradient as elliptical, perhaps?
+		Usually in conic gradients the sharp transition at 0deg is undesirable, which is typically avoided by making sure the first and last color stops are the same color. Perhaps it would be useful to have a keyword for automatically achieving this.
+
+	<p class='issue'>
+		Would a radius (inner & outer) for clipping the gradient be useful? If so, we could also support lengths in color stop positions, since we now have a specific radius.
+
+	<p class='issue'>
+		Are elliptical conic gradients useful? Do graphics libraries support them?
 
 <h4 id='conic-color-stops' class='no-toc'>
 Placing Color Stops</h4>