diff --git a/components/style/properties/longhands/ui.mako.rs b/components/style/properties/longhands/ui.mako.rs
index 81b9f0ba2c1..184c1c94aa0 100644
--- a/components/style/properties/longhands/ui.mako.rs
+++ b/components/style/properties/longhands/ui.mako.rs
@@ -315,3 +315,14 @@ ${helpers.predefined_type(
     spec="https://github.com/w3c/csswg-drafts/issues/6674",
     rule_types_allowed=DEFAULT_RULES_EXCEPT_KEYFRAME,
 )}
+
+${helpers.predefined_type(
+    "scroll-timeline-axis",
+    "ScrollAxis",
+    "computed::ScrollAxis::default()",
+    engines="gecko",
+    animation_value_type="none",
+    gecko_pref="layout.css.scroll-linked-animations.enabled",
+    spec="https://github.com/w3c/csswg-drafts/issues/6674",
+    rule_types_allowed=DEFAULT_RULES_EXCEPT_KEYFRAME,
+)}
diff --git a/components/style/values/computed/box.rs b/components/style/values/computed/box.rs
index 9207b2e5ef0..96071177a57 100644
--- a/components/style/values/computed/box.rs
+++ b/components/style/values/computed/box.rs
@@ -15,8 +15,9 @@ pub use crate::values::specified::box_::{
     AnimationName, AnimationTimeline, Appearance, BreakBetween, BreakWithin,
     Clear as SpecifiedClear, Contain, ContainerName, ContainerType, ContentVisibility, Display,
     Float as SpecifiedFloat, Overflow, OverflowAnchor, OverflowClipBox, OverscrollBehavior,
-    ScrollSnapAlign, ScrollSnapAxis, ScrollSnapStop, ScrollSnapStrictness, ScrollSnapType,
-    ScrollTimelineName, ScrollbarGutter, TouchAction, TransitionProperty, WillChange,
+    ScrollAxis, ScrollSnapAlign, ScrollSnapAxis, ScrollSnapStop, ScrollSnapStrictness,
+    ScrollSnapType, ScrollTimelineName, ScrollbarGutter, TouchAction, TransitionProperty,
+    WillChange,
 };
 
 /// A computed value for the `vertical-align` property.
diff --git a/components/style/values/computed/mod.rs b/components/style/values/computed/mod.rs
index b9cebd60159..729959ed71e 100644
--- a/components/style/values/computed/mod.rs
+++ b/components/style/values/computed/mod.rs
@@ -49,7 +49,7 @@ pub use self::box_::{AnimationIterationCount, AnimationName, AnimationTimeline,
 pub use self::box_::{Appearance, BreakBetween, BreakWithin, Clear, ContentVisibility, Float};
 pub use self::box_::{Display, Overflow, OverflowAnchor, TransitionProperty};
 pub use self::box_::{OverflowClipBox, OverscrollBehavior, Perspective, Resize, ScrollbarGutter};
-pub use self::box_::{ScrollSnapAlign, ScrollSnapAxis, ScrollSnapStop};
+pub use self::box_::{ScrollAxis, ScrollSnapAlign, ScrollSnapAxis, ScrollSnapStop};
 pub use self::box_::{ScrollSnapStrictness, ScrollSnapType, ScrollTimelineName};
 pub use self::box_::{TouchAction, VerticalAlign, WillChange};
 pub use self::color::{Color, ColorOrAuto, ColorPropertyValue, ColorScheme, PrintColorAdjust};
diff --git a/components/style/values/specified/box.rs b/components/style/values/specified/box.rs
index 2749b70c57d..c9583c96235 100644
--- a/components/style/values/specified/box.rs
+++ b/components/style/values/specified/box.rs
@@ -774,13 +774,13 @@ impl Default for Scroller {
 #[repr(u8)]
 pub enum ScrollAxis {
     /// The block axis of the scroll container. (Default.)
-    Block,
+    Block = 0,
     /// The inline axis of the scroll container.
-    Inline,
+    Inline = 1,
     /// The vertical block axis of the scroll container.
-    Vertical,
+    Vertical = 2,
     /// The horizontal axis of the scroll container.
-    Horizontal,
+    Horizontal = 3,
 }
 
 impl Default for ScrollAxis {
diff --git a/components/style/values/specified/mod.rs b/components/style/values/specified/mod.rs
index a13167c7f38..fd931761562 100644
--- a/components/style/values/specified/mod.rs
+++ b/components/style/values/specified/mod.rs
@@ -40,7 +40,7 @@ pub use self::box_::{AnimationIterationCount, AnimationName, AnimationTimeline,
 pub use self::box_::{Appearance, BreakBetween, BreakWithin, ContainerName, ContainerType};
 pub use self::box_::{Clear, ContentVisibility, Float, Overflow, OverflowAnchor};
 pub use self::box_::{OverflowClipBox, OverscrollBehavior, Perspective, Resize, ScrollbarGutter};
-pub use self::box_::{ScrollSnapAlign, ScrollSnapAxis, ScrollSnapStop};
+pub use self::box_::{ScrollAxis, ScrollSnapAlign, ScrollSnapAxis, ScrollSnapStop};
 pub use self::box_::{ScrollSnapStrictness, ScrollSnapType, ScrollTimelineName};
 pub use self::box_::{TouchAction, TransitionProperty, VerticalAlign, WillChange};
 pub use self::color::{Color, ColorOrAuto, ColorPropertyValue, ColorScheme, PrintColorAdjust};