diff --git a/mozilla/layout/html/tests/css/max-height.css b/mozilla/layout/html/tests/css/max-height.css
index 29841fea309..8f78556b218 100644
--- a/mozilla/layout/html/tests/css/max-height.css
+++ b/mozilla/layout/html/tests/css/max-height.css
@@ -16,10 +16,10 @@
  */
 
 
-GOOD :before { max-height: 3em } 
-GOOD :before { max-height: 15%; } 
-GOOD :before { max-height: none } 
-GOOD :before { max-height: inherit; } 
+GOOD { max-height: 3em } 
+GOOD { max-height: 15%; } 
+GOOD { max-height: none } 
+GOOD { max-height: inherit; } 
 BAD { max-height: babushka }
 BAD { max-height: auto; }
 BAD { max-height: 4px 4px; }
diff --git a/mozilla/layout/html/tests/css/max-width.css b/mozilla/layout/html/tests/css/max-width.css
index d016c935fb8..877b40a54d2 100644
--- a/mozilla/layout/html/tests/css/max-width.css
+++ b/mozilla/layout/html/tests/css/max-width.css
@@ -16,10 +16,12 @@
  */
 
 
-GOOD :before { max-width: 10px } 
-GOOD :before { max-width: 15%; } 
-GOOD :before { max-width: none } 
-GOOD :before { max-width: inherit; } 
+GOOD { max-width: 10px } 
+GOOD { max-width: 15%; } 
+GOOD { max-width: none } 
+GOOD { max-width: inherit; } 
 BAD { max-width: babushka }
 BAD { max-width: auto; }
 BAD { max-width: 1in 1in; }
+BAD { max-width: -3em; }
+BAD { max-width: -10%; }
\ No newline at end of file
diff --git a/mozilla/layout/html/tests/css/min-height.css b/mozilla/layout/html/tests/css/min-height.css
index 55cfb5e82eb..b830d4a5737 100644
--- a/mozilla/layout/html/tests/css/min-height.css
+++ b/mozilla/layout/html/tests/css/min-height.css
@@ -16,10 +16,12 @@
  */
 
 
-GOOD :before { min-height: 5pc } 
-GOOD :before { min-height: 15%; } 
-GOOD :before { min-height: none } 
-GOOD :before { min-height: inherit; } 
+GOOD { min-height: 5pc } 
+GOOD { min-height: 15%; } 
+GOOD { min-height: none } 
+GOOD { min-height: inherit; } 
 BAD { min-height: babushka }
 BAD { min-height: auto; }
 BAD { min-height: 4px 10mm; }
+BAD { min-height: -4pc; }
+BAD { min-height: -10%; }