--- a/layout/style/test/property_database.js
+++ b/layout/style/test/property_database.js
@@ -655,16 +655,18 @@ if (IsCSSPropertyPrefEnabled("layout.css
 
     "-moz-linear-gradient(top left, red, blue)",
     "-moz-linear-gradient(0 0, red, blue)",
     "-moz-linear-gradient(20% bottom, red, blue)",
     "-moz-linear-gradient(center 20%, red, blue)",
     "-moz-linear-gradient(left 35px, red, blue)",
     "-moz-linear-gradient(10% 10em, red, blue)",
     "-moz-linear-gradient(44px top, red, blue)",
+    "-moz-linear-gradient(left, red, blue)",
+    "-moz-linear-gradient(top, red, blue)",
 
     "-moz-linear-gradient(0px, red, blue)",
     "-moz-linear-gradient(0, red, blue)",
     "-moz-linear-gradient(top left 45deg, red, blue)",
     "-moz-linear-gradient(20% bottom -300deg, red, blue)",
     "-moz-linear-gradient(center 20% 1.95929rad, red, blue)",
     "-moz-linear-gradient(left 35px 30grad, red, blue)",
     "-moz-linear-gradient(left 35px 0.1turn, red, blue)",