[css-overflow] Index new test

Author: frivoal

css-contain-1/Overview.bs

@@ -1188,6 +1188,10 @@ Paint Containment</h3>
 		nor does it inhibit the creation of any such mechanism through other properties,
 		<span class=informative>such as 'overflow', 'resize', or 'text-overflow'</span>.
 
+		<wpt>
+		contain-paint-050.html
+		</wpt>
+
 		Note: The next level of this specification [[CSS-CONTAIN-2]] refines this effect
 		to apply to the [=overflow clip edge=] rather than the [=padding edge=],
 		in order to take the new 'overflow-clip-margin' property into account.

css-contain-2/Overview.bs

@@ -1097,6 +1097,10 @@ Paint Containment</h3>
 		nor does it inhibit the creation of any such mechanism through other properties,
 		<span class=informative>such as 'overflow', 'resize', or 'text-overflow'</span>.
 
+		<wpt>
+		contain-paint-050.html
+		</wpt>
+
 		Note: This clipping shape respects 'overflow-clip-margin',
 		allowing an element with [=paint containment=]
 		to still slightly overflow its normal bounds.