diff --git a/test/unit/styling-scoped.html b/test/unit/styling-scoped.html
index d502d5905a..d7547740fe 100644
--- a/test/unit/styling-scoped.html
+++ b/test/unit/styling-scoped.html
@@ -418,6 +418,17 @@
       assertComputed(t, 'auto', 'top');
     });
 
+    test(':host(...) with non-matching type selector does not leak', function() {
+      var t = document.createElement('x-shared1x-shared2');
+      t.textContent = ':host(non-matching-type-selector)';
+      document.body.appendChild(t);
+      assertComputed(t, '0px');
+      var t = document.createElement('x-shared2x-shared1');
+      t.textContent = ':host(non-matching-type-selector)';
+      document.body.appendChild(t);
+      assertComputed(t, '0px');
+    });
+
 });
 
 </script>