Update web-platform-tests to revision 84af6c875d378944b39d895acdcfc170736b2d3d

tests/wpt/web-platform-tests/css/css-variables/variable-substitution-basic.html

@@ -38,6 +38,12 @@
                 expectedValue:"0px 0px",
                 style:"--gap: 20;border-spacing: var(--gap)px;"
             },
+            {
+                testName:"You can't build up a single token where part of it is provided by a variable (percentages)",
+                propertyName:"text-indent",
+                expectedValue:"0px",
+                style:"--v: 20;text-indent: var(--v)%;"
+            },
             {
                 testName:"Multiple variable references in a single property",
                 propertyName:"border-spacing",
@@ -115,4 +121,4 @@
         });
     </script>
 </body>
-</html>
+</html>