diff --git a/css/css-values/signs-abs-invalid.html b/css/css-values/signs-abs-invalid.html
index 15b058d0c42bad..ccb94c21c232eb 100644
--- a/css/css-values/signs-abs-invalid.html
+++ b/css/css-values/signs-abs-invalid.html
@@ -8,7 +8,16 @@
 <script src="../support/parsing-testcommon.js"></script>
 <script>
 function test_invalid_number(value) {
-  test_invalid_value('opacity', value);
+  test_invalid_value('font-weight', value);
+}
+
+function test_invalid_length_percentage(value) {
+  test_invalid_value('margin-left', value);
+  test_invalid_length(value);
+}
+
+function test_invalid_length(value) {
+  test_invalid_value('tab-size', value);
 }
 
 // Syntax checking
@@ -24,6 +33,13 @@
 test_invalid_number('abs(1 2)');
 test_invalid_number('abs(1, , 2)');
 test_invalid_number('abs(1, 2)');
+test_invalid_number('abs(1, 1%)');
+test_invalid_number('abs(1, 0px)');
+test_invalid_number('abs(1, 0s)');
+test_invalid_number('abs(1, 0deg)');
+test_invalid_number('abs(1, 0Hz)');
+test_invalid_number('abs(1, 0dpi)');
+test_invalid_number('abs(1, 0fr)');
 test_invalid_number('sign()');
 test_invalid_number('sign( )');
 test_invalid_number('sign(,)');
@@ -36,6 +52,13 @@
 test_invalid_number('sign(1 2)');
 test_invalid_number('sign(1, , 2)');
 test_invalid_number('sign(1, 2)');
+test_invalid_number('sign(1, 1%)');
+test_invalid_number('sign(1, 0px)');
+test_invalid_number('sign(1, 0s)');
+test_invalid_number('sign(1, 0deg)');
+test_invalid_number('sign(1, 0Hz)');
+test_invalid_number('sign(1, 0dpi)');
+test_invalid_number('sign(1, 0fr)');
 
 // Type checking
 test_invalid_number('abs(0px)');
@@ -44,18 +67,11 @@
 test_invalid_number('abs(0Hz)');
 test_invalid_number('abs(0dpi)');
 test_invalid_number('abs(0fr)');
-test_invalid_number('abs(1, 1%)');
-test_invalid_number('abs(1, 0px)');
-test_invalid_number('abs(1, 0s)');
-test_invalid_number('abs(1, 0deg)');
-test_invalid_number('abs(1, 0Hz)');
-test_invalid_number('abs(1, 0dpi)');
-test_invalid_number('abs(1, 0fr)');
-test_invalid_number('sign(1, 1%)');
-test_invalid_number('sign(1, 0px)');
-test_invalid_number('sign(1, 0s)');
-test_invalid_number('sign(1, 0deg)');
-test_invalid_number('sign(1, 0Hz)');
-test_invalid_number('sign(1, 0dpi)');
-test_invalid_number('sign(1, 0fr)');
-</script>
\ No newline at end of file
+test_invalid_number('abs(1%)');
+test_invalid_number('sign(10px + 5rad)');
+test_invalid_number('sign(10%)');
+test_invalid_length('abs(10%)');
+test_invalid_length('1px * sign(10%)');
+test_invalid_length('1px * sign(1em + 10%)');
+test_invalid_length_percentage('1px * sign(10px + 5rad)');
+</script>