diff --git a/components/style/stylesheets/scroll_timeline_rule.rs b/components/style/stylesheets/scroll_timeline_rule.rs
index 5a6f3ad1cc0..589814eff20 100644
--- a/components/style/stylesheets/scroll_timeline_rule.rs
+++ b/components/style/stylesheets/scroll_timeline_rule.rs
@@ -157,15 +157,19 @@ impl<'a, 'b, 'i> DeclarationParser<'i> for ScrollTimelineDescriptorsParser<'a, '
 /// The scroll-timeline source.
 ///
 /// https://drafts.csswg.org/scroll-animations/#descdef-scroll-timeline-source
+// FIXME: Bug 1733260 may drop the entire @scroll-timeline, and now we don't support source other
+// than the default value (so use #[css(skip)]).
 #[derive(Clone, Debug, Parse, PartialEq, ToCss, ToShmem)]
 pub enum Source {
     /// The scroll container.
+    #[css(skip)]
     Selector(ScrollTimelineSelector),
     /// The initial value. The scrollingElement of the Document associated with the Window that is
     /// the current global object.
     Auto,
     /// Null. However, it's not clear what is the expected behavior of this. See the spec issue:
     /// https://drafts.csswg.org/scroll-animations/#issue-0d1e73bd
+    #[css(skip)]
     None,
 }
 
@@ -215,7 +219,7 @@ pub struct ScrollOffsets(#[css(if_empty = "none", iterable)] Box<[ScrollTimeline
 
 impl Parse for ScrollOffsets {
     fn parse<'i, 't>(
-        context: &ParserContext,
+        _context: &ParserContext,
         input: &mut Parser<'i, 't>,
     ) -> Result<Self, ParseError<'i>> {
         if input.try_parse(|i| i.expect_ident_matching("none")).is_ok() {
@@ -224,7 +228,7 @@ impl Parse for ScrollOffsets {
 
         Ok(ScrollOffsets(
             input
-                .parse_comma_separated(|i| ScrollTimelineOffset::parse(context, i))?
+                .parse_comma_separated(|i| ScrollTimelineOffset::parse(i))?
                 .into_boxed_slice(),
         ))
     }
@@ -234,14 +238,18 @@ impl Parse for ScrollOffsets {
 /// value: auto | <length-percentage> | <element-offset>
 ///
 /// https://drafts.csswg.org/scroll-animations/#typedef-scroll-timeline-offset
+// FIXME: Bug 1733260 may drop the entire @scroll-timeline, and now we don't support
+// <scroll-timeline-offset> other than the default value (so use #[css(skip)]).
 #[derive(Clone, Debug, Parse, PartialEq, ToCss, ToShmem)]
 pub enum ScrollTimelineOffset {
     /// The initial value. A container-based offset.
     Auto,
     /// A container-based offset with the distance indicated by the value along source's scroll
     /// range in orientation.
+    #[css(skip)]
     LengthPercentage(LengthPercentage),
     /// An element-based offset.
+    #[css(skip)]
     ElementOffset(ElementOffset),
 }