|  | <!DOCTYPE html> | 
|  | <link rel="help" href="https://compat.spec.whatwg.org/#css-gradients-webkit-radial-gradient"> | 
|  | <link rel="help" href="https://www.w3.org/TR/css3-images/#radial-gradients"> | 
|  | <meta name="assert" content="Negative radii values are invalid."> | 
|  | <script src="/resources/testharness.js"></script> | 
|  | <script src="/resources/testharnessreport.js"></script> | 
|  | <script> | 
|  | test(function() { | 
|  | assert_true(CSS.supports("background-image", "-webkit-radial-gradient(1px 2px, 3% 4%, red, blue)")); | 
|  | }, '-webkit-radial-gradient accepts comma before color stops.'); | 
|  |  | 
|  | test(function() { | 
|  | assert_false(CSS.supports("background-image", "-webkit-radial-gradient(1px 2px, 3% 4% red, blue)")); | 
|  | }, '-webkit-radial-gradient rejects missing comma before color stops.'); | 
|  | </script> |