[css-overflow] test coverage

Author: frivoal

css-overflow-4/Overview.bs

@@ -1858,6 +1858,7 @@ Handling of Excess Content: the 'continue' property</h3>
 		line-clamp-with-floats-005.html
 		line-clamp-with-floats-006.html
 		line-clamp-with-floats-010.html
+		line-clamp-with-floats-011.html
 	</wpt>
 
 	If a [=block container=] contains a [=clamp point=],