This test passes now that bug 221428 is fixed.

layout/reftests/bugs/reftest.list

@@ -220,7 +220,7 @@ fails-if(MOZ_WIDGET_TOOLKIT=="cocoa") == 372037-1.html 372037-1-ref.html # bug 3
 == 374038-1.xul 374038-1-ref.xul
 == 374038-2.xul 374038-2-ref.xul
 == 374193-1.xhtml about:blank
-fails == 376484-1.html 376484-1-ref.html
+== 376484-1.html 376484-1-ref.html
 == 377603-1.html 377603-1-ref.html
 == 378535-1.html 378535-1-ref.html
 == 379316-1.html 379316-1-ref.html