1 files changed, 40 insertions, 0 deletions
diff --git a/servo/components/style/values/specified/animation.rs b/servo/components/style/values/specified/animation.rs
index 5a1f5003f3..552521711c 100644
--- a/servo/components/style/values/specified/animation.rs
+++ b/servo/components/style/values/specified/animation.rs
@@ -165,6 +165,12 @@ impl AnimationIterationCount {
     pub fn one() -> Self {
         Self::Number(NonNegativeNumber::new(1.0))
     }
+
+    /// Returns true if it's `1.0`.
+    #[inline]
+    pub fn is_one(&self) -> bool {
+        *self == Self::one()
+    }
 }
 
 /// A value for the `animation-name` property.
@@ -230,6 +236,17 @@ pub enum AnimationDirection {
     AlternateReverse,
 }
 
+impl AnimationDirection {
+    /// Returns true if the name matches any animation-direction keyword.
+    #[inline]
+    pub fn match_keywords(name: &AnimationName) -> bool {
+        if let Some(name) = name.as_atom() {
+            return name.with_str(|n| Self::from_ident(n).is_ok());
+        }
+        false
+    }
+}
+
 /// https://drafts.csswg.org/css-animations/#animation-play-state
 #[derive(Copy, Clone, Debug, MallocSizeOf, Parse, PartialEq, SpecifiedValueInfo, ToComputedValue, ToCss, ToResolvedValue, ToShmem)]
 #[repr(u8)]
@@ -239,6 +256,17 @@ pub enum AnimationPlayState {
     Paused,
 }
 
+impl AnimationPlayState {
+    /// Returns true if the name matches any animation-play-state keyword.
+    #[inline]
+    pub fn match_keywords(name: &AnimationName) -> bool {
+        if let Some(name) = name.as_atom() {
+            return name.with_str(|n| Self::from_ident(n).is_ok());
+        }
+        false
+    }
+}
+
 /// https://drafts.csswg.org/css-animations/#propdef-animation-fill-mode
 #[derive(Copy, Clone, Debug, MallocSizeOf, Parse, PartialEq, SpecifiedValueInfo, ToComputedValue, ToCss, ToResolvedValue, ToShmem)]
 #[repr(u8)]
@@ -250,6 +278,18 @@ pub enum AnimationFillMode {
     Both,
 }
 
+impl AnimationFillMode {
+    /// Returns true if the name matches any animation-fill-mode keyword.
+    /// Note: animation-name:none is its initial value, so we don't have to match none here.
+    #[inline]
+    pub fn match_keywords(name: &AnimationName) -> bool {
+        if let Some(atom) = name.as_atom() {
+            return !name.is_none() && atom.with_str(|n| Self::from_ident(n).is_ok());
+        }
+        false
+    }
+}
+
 /// https://drafts.csswg.org/css-animations-2/#animation-composition
 #[derive(Copy, Clone, Debug, MallocSizeOf, Parse, PartialEq, SpecifiedValueInfo, ToComputedValue, ToCss, ToResolvedValue, ToShmem)]
 #[repr(u8)]