Move font-feature-values to Fonts 4 (#11563)

diff --git a/css/css-fonts/test_font_feature_values_parsing.html b/css/css-fonts/test_font_feature_values_parsing.html
index f5c03c1..7a5844d 100644
--- a/css/css-fonts/test_font_feature_values_parsing.html
+++ b/css/css-fonts/test_font_feature_values_parsing.html
@@ -4,7 +4,7 @@
   <meta charset=utf-8>
   <title>@font-feature-values rule parsing tests</title>
   <link rel="author" title="John Daggett" href="mailto:jdaggett@mozilla.com">
-  <link rel="help" href="http://www.w3.org/TR/css-fonts-3/#font-feature-values" />
+  <link rel="help" href="http://www.w3.org/TR/css-fonts-4/#font-feature-values" />
   <meta name="assert" content="tests that valid @font-feature-values rules parse and invalid ones don't" />
   <!-- https://bugzilla.mozilla.org/show_bug.cgi?id=549861 -->
   <script type="text/javascript" src="/resources/testharness.js"></script>