2 files changed, 14 insertions, 6 deletions
diff --git a/servo/components/style/properties/longhands/font.mako.rs b/servo/components/style/properties/longhands/font.mako.rs
index f188af5b1f..4583de0bd7 100644
--- a/servo/components/style/properties/longhands/font.mako.rs
+++ b/servo/components/style/properties/longhands/font.mako.rs
@@ -305,10 +305,7 @@ ${helpers.predefined_type(
     "MathDepth",
     "0",
     engines="gecko",
-    gecko_pref="layout.css.math-depth.enabled",
-    has_effect_on_gecko_scrollbars=False,
     animation_value_type="none",
-    enabled_in="ua",
     spec="https://mathml-refresh.github.io/mathml-core/#the-math-script-level-property",
     affects="",
 )}
@@ -318,11 +315,8 @@ ${helpers.single_keyword(
     "normal compact",
     engines="gecko",
     gecko_enum_prefix="StyleMathStyle",
-    gecko_pref="layout.css.math-style.enabled",
     spec="https://mathml-refresh.github.io/mathml-core/#the-math-style-property",
-    has_effect_on_gecko_scrollbars=False,
     animation_value_type="none",
-    enabled_in="ua",
     needs_conversion=True,
     affects="layout",
 )}
diff --git a/servo/components/style/properties/longhands/ui.mako.rs b/servo/components/style/properties/longhands/ui.mako.rs
index 1150816ac0..58006e0d65 100644
--- a/servo/components/style/properties/longhands/ui.mako.rs
+++ b/servo/components/style/properties/longhands/ui.mako.rs
@@ -199,6 +199,20 @@ ${helpers.predefined_type(
     affects="",
 )}
 
+${helpers.predefined_type(
+    "transition-behavior",
+    "TransitionBehavior",
+    "computed::TransitionBehavior::normal()",
+    engines="gecko",
+    initial_specified_value="specified::TransitionBehavior::normal()",
+    vector=True,
+    need_index=True,
+    animation_value_type="none",
+    gecko_pref="layout.css.transition-behavior.enabled",
+    spec="https://drafts.csswg.org/css-transitions-2/#transition-behavior-property",
+    affects="",
+)}
+
 <% animation_extra_prefixes = "moz:layout.css.prefixes.animations webkit" %>
 
 ${helpers.predefined_type(