Index: trunk/src/org/openstreetmap/josm/data/validation/tests/UntaggedWay.java
===================================================================
--- trunk/src/org/openstreetmap/josm/data/validation/tests/UntaggedWay.java	(revision 18174)
+++ trunk/src/org/openstreetmap/josm/data/validation/tests/UntaggedWay.java	(revision 18176)
@@ -13,4 +13,5 @@
 import org.openstreetmap.josm.data.osm.OsmDataManager;
 import org.openstreetmap.josm.data.osm.OsmPrimitive;
+import org.openstreetmap.josm.data.osm.OsmUtils;
 import org.openstreetmap.josm.data.osm.Relation;
 import org.openstreetmap.josm.data.osm.RelationMember;
@@ -112,5 +113,6 @@
         }
 
-        if (!w.isTagged() && !waysUsedInRelations.contains(w)) {
+        // #20393 - ways tagged with just area=yes are catched by MapCSS tests
+        if (!w.isTagged() && !w.hasTag("area", OsmUtils.TRUE_VALUE) && !waysUsedInRelations.contains(w)) {
             if (w.hasKeys()) {
                 errors.add(TestError.builder(this, Severity.WARNING, COMMENTED_WAY)