diff --git a/components/malloc_size_of/lib.rs b/components/malloc_size_of/lib.rs
index 2c064f1ebe2..d9aff95912d 100644
--- a/components/malloc_size_of/lib.rs
+++ b/components/malloc_size_of/lib.rs
@@ -403,7 +403,10 @@ impl<T> MallocShallowSizeOf for thin_vec::ThinVec<T> {
             return 0;
         }
 
-        assert_eq!(std::mem::size_of::<Self>(), std::mem::size_of::<*const ()>());
+        assert_eq!(
+            std::mem::size_of::<Self>(),
+            std::mem::size_of::<*const ()>()
+        );
         unsafe { ops.malloc_size_of(*(self as *const Self as *const *const ())) }
     }
 }
diff --git a/components/selectors/builder.rs b/components/selectors/builder.rs
index 127b08f6b6e..3539032b35e 100644
--- a/components/selectors/builder.rs
+++ b/components/selectors/builder.rs
@@ -385,8 +385,7 @@ where
 /// Finds the maximum specificity of elements in the list and returns it.
 pub(crate) fn selector_list_specificity_and_flags<'a, Impl: SelectorImpl>(
     itr: impl Iterator<Item = &'a Selector<Impl>>,
-) -> SpecificityAndFlags
-{
+) -> SpecificityAndFlags {
     let mut specificity = 0;
     let mut flags = SelectorFlags::empty();
     for selector in itr {
diff --git a/components/selectors/parser.rs b/components/selectors/parser.rs
index 6a963211475..95cba4a41a4 100644
--- a/components/selectors/parser.rs
+++ b/components/selectors/parser.rs
@@ -658,10 +658,13 @@ impl<Impl: SelectorImpl> Selector<Impl> {
     }
 
     fn ampersand() -> Self {
-        Self(ThinArc::from_header_and_iter(SpecificityAndFlags {
-            specificity: 0,
-            flags: SelectorFlags::HAS_PARENT,
-        }, std::iter::once(Component::ParentSelector)))
+        Self(ThinArc::from_header_and_iter(
+            SpecificityAndFlags {
+                specificity: 0,
+                flags: SelectorFlags::HAS_PARENT,
+            },
+            std::iter::once(Component::ParentSelector),
+        ))
     }
 
     #[inline]
@@ -977,8 +980,12 @@ impl<Impl: SelectorImpl> Selector<Impl> {
             specificity += parent_specificity;
             let iter = iter
                 .cloned()
-                .chain(std::iter::once(Component::Combinator(Combinator::Descendant)))
-                .chain(std::iter::once(Component::Is(parent.to_vec().into_boxed_slice())));
+                .chain(std::iter::once(Component::Combinator(
+                    Combinator::Descendant,
+                )))
+                .chain(std::iter::once(Component::Is(
+                    parent.to_vec().into_boxed_slice(),
+                )));
             let header = HeaderWithLength::new(specificity_and_flags, len);
             UniqueArc::from_header_and_iter_with_size(header, iter, len)
         } else {
@@ -4081,25 +4088,19 @@ pub mod tests {
         let parent = parse(".bar, div .baz").unwrap();
         let child = parse("#foo &.bar").unwrap();
         assert_eq!(
-            SelectorList::from_vec(vec![child.0[0]
-                .replace_parent_selector(&parent.0)
-            ]),
+            SelectorList::from_vec(vec![child.0[0].replace_parent_selector(&parent.0)]),
             parse("#foo :is(.bar, div .baz).bar").unwrap()
         );
 
         let has_child = parse("#foo:has(&.bar)").unwrap();
         assert_eq!(
-            SelectorList::from_vec(vec![has_child.0[0]
-                .replace_parent_selector(&parent.0)
-                ]),
+            SelectorList::from_vec(vec![has_child.0[0].replace_parent_selector(&parent.0)]),
             parse("#foo:has(:is(.bar, div .baz).bar)").unwrap()
         );
 
         let child = parse("#foo").unwrap();
         assert_eq!(
-            SelectorList::from_vec(vec![child.0[0]
-                .replace_parent_selector(&parent.0)
-                ]),
+            SelectorList::from_vec(vec![child.0[0].replace_parent_selector(&parent.0)]),
             parse(":is(.bar, div .baz) #foo").unwrap()
         );
     }
diff --git a/components/servo_arc/lib.rs b/components/servo_arc/lib.rs
index cb75f359486..a201e5f7065 100644
--- a/components/servo_arc/lib.rs
+++ b/components/servo_arc/lib.rs
@@ -1045,11 +1045,17 @@ impl<H, T> UniqueArc<HeaderSliceWithLength<H, [T]>> {
     }
 
     #[inline]
-    pub fn from_header_and_iter_with_size<I>(header: HeaderWithLength<H>, items: I, num_items: usize) -> Self
+    pub fn from_header_and_iter_with_size<I>(
+        header: HeaderWithLength<H>,
+        items: I,
+        num_items: usize,
+    ) -> Self
     where
         I: Iterator<Item = T>,
     {
-        Self(Arc::from_header_and_iter_with_size(header, items, num_items))
+        Self(Arc::from_header_and_iter_with_size(
+            header, items, num_items,
+        ))
     }
 
     /// Returns a mutable reference to the header.
diff --git a/components/style/counter_style/mod.rs b/components/style/counter_style/mod.rs
index e1953477816..65143d69906 100644
--- a/components/style/counter_style/mod.rs
+++ b/components/style/counter_style/mod.rs
@@ -13,7 +13,9 @@ use crate::str::CssStringWriter;
 use crate::values::specified::Integer;
 use crate::values::CustomIdent;
 use crate::Atom;
-use cssparser::{AtRuleParser, RuleBodyParser, RuleBodyItemParser, DeclarationParser, QualifiedRuleParser};
+use cssparser::{
+    AtRuleParser, DeclarationParser, QualifiedRuleParser, RuleBodyItemParser, RuleBodyParser,
+};
 use cssparser::{CowRcStr, Parser, SourceLocation, Token};
 use selectors::parser::SelectorParseErrorKind;
 use std::fmt::{self, Write};
@@ -159,9 +161,15 @@ impl<'a, 'b, 'i> QualifiedRuleParser<'i> for CounterStyleRuleParser<'a, 'b> {
     type Error = StyleParseErrorKind<'i>;
 }
 
-impl<'a, 'b, 'i> RuleBodyItemParser<'i, (), StyleParseErrorKind<'i>> for CounterStyleRuleParser<'a, 'b> {
-    fn parse_qualified(&self) -> bool { false }
-    fn parse_declarations(&self) -> bool { true }
+impl<'a, 'b, 'i> RuleBodyItemParser<'i, (), StyleParseErrorKind<'i>>
+    for CounterStyleRuleParser<'a, 'b>
+{
+    fn parse_qualified(&self) -> bool {
+        false
+    }
+    fn parse_declarations(&self) -> bool {
+        true
+    }
 }
 
 macro_rules! checker {
diff --git a/components/style/custom_properties.rs b/components/style/custom_properties.rs
index f7fdd0913e9..f9516befc67 100644
--- a/components/style/custom_properties.rs
+++ b/components/style/custom_properties.rs
@@ -149,10 +149,7 @@ static CHROME_ENVIRONMENT_VARIABLES: [EnvironmentVariable; 6] = [
         atom!("-moz-content-preferred-color-scheme"),
         get_content_preferred_color_scheme
     ),
-    make_variable!(
-        atom!("scrollbar-inline-size"),
-        get_scrollbar_inline_size
-    ),
+    make_variable!(atom!("scrollbar-inline-size"), get_scrollbar_inline_size),
 ];
 
 impl CssEnvironment {
diff --git a/components/style/data.rs b/components/style/data.rs
index 587c1e3a1a8..62dff225f8f 100644
--- a/components/style/data.rs
+++ b/components/style/data.rs
@@ -398,7 +398,9 @@ impl ElementData {
 
         let needs_to_recascade_self = hint.intersects(RestyleHint::RECASCADE_SELF) ||
             (hint.intersects(RestyleHint::RECASCADE_SELF_IF_INHERIT_RESET_STYLE) &&
-                style.flags.contains(ComputedValueFlags::INHERITS_RESET_STYLE));
+                style
+                    .flags
+                    .contains(ComputedValueFlags::INHERITS_RESET_STYLE));
         if needs_to_recascade_self {
             return Some(RestyleKind::CascadeOnly);
         }
@@ -442,7 +444,9 @@ impl ElementData {
 
         let needs_to_recascade_self = hint.intersects(RestyleHint::RECASCADE_SELF) ||
             (hint.intersects(RestyleHint::RECASCADE_SELF_IF_INHERIT_RESET_STYLE) &&
-                style.flags.contains(ComputedValueFlags::INHERITS_RESET_STYLE));
+                style
+                    .flags
+                    .contains(ComputedValueFlags::INHERITS_RESET_STYLE));
         if needs_to_recascade_self {
             return Some(RestyleKind::CascadeOnly);
         }
diff --git a/components/style/dom.rs b/components/style/dom.rs
index 9f9a7af7b78..015e1eb80b6 100644
--- a/components/style/dom.rs
+++ b/components/style/dom.rs
@@ -17,8 +17,8 @@ use crate::properties::{AnimationDeclarations, ComputedValues, PropertyDeclarati
 use crate::selector_parser::{AttrValue, Lang, PseudoElement, SelectorImpl};
 use crate::shared_lock::{Locked, SharedRwLock};
 use crate::stylist::CascadeData;
-use crate::values::AtomIdent;
 use crate::values::computed::Display;
+use crate::values::AtomIdent;
 use crate::{LocalName, Namespace, WeakAtom};
 use atomic_refcell::{AtomicRef, AtomicRefMut};
 use selectors::matching::{QuirksMode, VisitedHandlingMode};
@@ -199,7 +199,10 @@ pub trait TNode: Sized + Copy + Clone + Debug + NodeInfo + PartialEq {
                 return Some(s);
             }
 
-            debug_assert!(current.parent_node().is_some(), "Not a descendant of the scope?");
+            debug_assert!(
+                current.parent_node().is_some(),
+                "Not a descendant of the scope?"
+            );
             current = current.parent_node()?;
         }
     }
@@ -893,7 +896,10 @@ pub trait TElement:
     /// Returns the size of the element to be used in container size queries.
     /// This will usually be the size of the content area of the primary box,
     /// but can be None if there is no box or if some axis lacks size containment.
-    fn query_container_size(&self, display: &Display) -> euclid::default::Size2D<Option<app_units::Au>>;
+    fn query_container_size(
+        &self,
+        display: &Display,
+    ) -> euclid::default::Size2D<Option<app_units::Au>>;
 
     /// Returns true if this element anchors a relative selector, now or after
     /// a DOM mutation.
diff --git a/components/style/dom_apis.rs b/components/style/dom_apis.rs
index 41ee2b2073c..4afcc813ef8 100644
--- a/components/style/dom_apis.rs
+++ b/components/style/dom_apis.rs
@@ -7,10 +7,10 @@
 
 use crate::context::QuirksMode;
 use crate::dom::{TDocument, TElement, TNode, TShadowRoot};
-use crate::selector_parser::SelectorImpl;
 use crate::invalidation::element::invalidation_map::Dependency;
 use crate::invalidation::element::invalidator::{DescendantInvalidationLists, Invalidation};
 use crate::invalidation::element::invalidator::{InvalidationProcessor, InvalidationVector};
+use crate::selector_parser::SelectorImpl;
 use crate::values::AtomIdent;
 use selectors::attr::CaseSensitivity;
 use selectors::matching::{self, MatchingContext, MatchingMode, NeedsSelectorFlags};
@@ -381,7 +381,12 @@ fn get_id(component: &Component<SelectorImpl>) -> Option<&AtomIdent> {
     use selectors::attr::AttrSelectorOperator;
     Some(match component {
         Component::ID(ref id) => id,
-        Component::AttributeInNoNamespace { ref operator, ref local_name, ref value, .. } => {
+        Component::AttributeInNoNamespace {
+            ref operator,
+            ref local_name,
+            ref value,
+            ..
+        } => {
             if *local_name != local_name!("id") {
                 return None;
             }
@@ -510,9 +515,19 @@ where
                         if combinator.is_none() {
                             // In the rightmost compound, just find descendants of root that match
                             // the selector list with that id.
-                            collect_elements_with_id::<E, Q, _>(root, id, results, quirks_mode, |e| {
-                                matching::matches_selector_list(selector_list, &e, matching_context)
-                            });
+                            collect_elements_with_id::<E, Q, _>(
+                                root,
+                                id,
+                                results,
+                                quirks_mode,
+                                |e| {
+                                    matching::matches_selector_list(
+                                        selector_list,
+                                        &e,
+                                        matching_context,
+                                    )
+                                },
+                            );
                             return Ok(());
                         }
 
diff --git a/components/style/driver.rs b/components/style/driver.rs
index c6011b6c5a0..6031feb16ee 100644
--- a/components/style/driver.rs
+++ b/components/style/driver.rs
@@ -137,10 +137,7 @@ where
             continue;
         }
         depth += 1;
-        if pool.is_some() &&
-            discovered.len() > parallelism_threshold &&
-            parallelism_threshold > 0
-        {
+        if pool.is_some() && discovered.len() > parallelism_threshold && parallelism_threshold > 0 {
             let pool = pool.unwrap();
             let tls = ScopedTLS::<ThreadLocalStyleContext<E>>::new(pool);
             let root_opaque = root.as_node().opaque();
diff --git a/components/style/font_face.rs b/components/style/font_face.rs
index 2166523656b..86b1bf2ba53 100644
--- a/components/style/font_face.rs
+++ b/components/style/font_face.rs
@@ -27,8 +27,8 @@ use crate::values::specified::NonNegativePercentage;
 #[cfg(feature = "gecko")]
 use cssparser::UnicodeRange;
 use cssparser::{
-    AtRuleParser, CowRcStr, RuleBodyParser, RuleBodyItemParser, DeclarationParser, Parser,
-    QualifiedRuleParser, SourceLocation,
+    AtRuleParser, CowRcStr, DeclarationParser, Parser, QualifiedRuleParser, RuleBodyItemParser,
+    RuleBodyParser, SourceLocation,
 };
 use selectors::parser::SelectorParseErrorKind;
 use std::fmt::{self, Write};
@@ -566,9 +566,15 @@ impl<'a, 'b, 'i> QualifiedRuleParser<'i> for FontFaceRuleParser<'a, 'b> {
     type Error = StyleParseErrorKind<'i>;
 }
 
-impl<'a, 'b, 'i> RuleBodyItemParser<'i, (), StyleParseErrorKind<'i>> for FontFaceRuleParser<'a, 'b> {
-    fn parse_qualified(&self) -> bool { false }
-    fn parse_declarations(&self) -> bool { true }
+impl<'a, 'b, 'i> RuleBodyItemParser<'i, (), StyleParseErrorKind<'i>>
+    for FontFaceRuleParser<'a, 'b>
+{
+    fn parse_qualified(&self) -> bool {
+        false
+    }
+    fn parse_declarations(&self) -> bool {
+        true
+    }
 }
 
 fn font_tech_enabled() -> bool {
diff --git a/components/style/gecko/arc_types.rs b/components/style/gecko/arc_types.rs
index 1ee2c23c2da..4a9512b4447 100644
--- a/components/style/gecko/arc_types.rs
+++ b/components/style/gecko/arc_types.rs
@@ -94,11 +94,7 @@ impl_locked_arc_ffi!(
     Servo_MediaList_AddRef,
     Servo_MediaList_Release
 );
-impl_simple_arc_ffi!(
-    MediaRule,
-    Servo_MediaRule_AddRef,
-    Servo_MediaRule_Release
-);
+impl_simple_arc_ffi!(MediaRule, Servo_MediaRule_AddRef, Servo_MediaRule_Release);
 impl_simple_arc_ffi!(
     NamespaceRule,
     Servo_NamespaceRule_AddRef,
diff --git a/components/style/gecko/data.rs b/components/style/gecko/data.rs
index 169ae1668ae..c4a5554c5e5 100644
--- a/components/style/gecko/data.rs
+++ b/components/style/gecko/data.rs
@@ -6,7 +6,9 @@
 
 use crate::dom::TElement;
 use crate::gecko_bindings::bindings;
-use crate::gecko_bindings::structs::{self, ServoStyleSetSizes, StyleSheet as DomStyleSheet, StyleSheetInfo};
+use crate::gecko_bindings::structs::{
+    self, ServoStyleSetSizes, StyleSheet as DomStyleSheet, StyleSheetInfo,
+};
 use crate::invalidation::media_queries::{MediaListKey, ToMediaListKey};
 use crate::media_queries::{Device, MediaList};
 use crate::properties::ComputedValues;
diff --git a/components/style/gecko/media_features.rs b/components/style/gecko/media_features.rs
index 7e61f4e1232..4ca746ea84d 100644
--- a/components/style/gecko/media_features.rs
+++ b/components/style/gecko/media_features.rs
@@ -239,8 +239,9 @@ fn eval_prefers_reduced_transparency(
     context: &Context,
     query_value: Option<PrefersReducedTransparency>,
 ) -> bool {
-    let prefers_reduced =
-        unsafe { bindings::Gecko_MediaFeatures_PrefersReducedTransparency(context.device().document()) };
+    let prefers_reduced = unsafe {
+        bindings::Gecko_MediaFeatures_PrefersReducedTransparency(context.device().document())
+    };
     let query_value = match query_value {
         Some(v) => v,
         None => return prefers_reduced,
@@ -309,10 +310,7 @@ enum InvertedColors {
 }
 
 /// https://drafts.csswg.org/mediaqueries-5/#inverted
-fn eval_inverted_colors(
-    context: &Context,
-    query_value: Option<InvertedColors>,
-) -> bool {
+fn eval_inverted_colors(context: &Context, query_value: Option<InvertedColors>) -> bool {
     let inverted_colors =
         unsafe { bindings::Gecko_MediaFeatures_InvertedColors(context.device().document()) };
     let query_value = match query_value {
@@ -604,13 +602,12 @@ pub enum Scripting {
     /// See: https://github.com/w3c/csswg-drafts/issues/8621
     InitialOnly,
     /// Scripting is supported and enabled
-    Enabled
+    Enabled,
 }
 
 /// https://drafts.csswg.org/mediaqueries-5/#scripting
 fn eval_scripting(context: &Context, query_value: Option<Scripting>) -> bool {
-    let scripting =
-        unsafe { bindings::Gecko_MediaFeatures_Scripting(context.device().document()) };
+    let scripting = unsafe { bindings::Gecko_MediaFeatures_Scripting(context.device().document()) };
     match query_value {
         Some(v) => v == scripting,
         None => scripting != Scripting::None,
@@ -824,7 +821,10 @@ pub static MEDIA_FEATURES: [QueryFeatureDescription; 67] = [
     feature!(
         atom!("prefers-reduced-transparency"),
         AllowsRanges::No,
-        keyword_evaluator!(eval_prefers_reduced_transparency, PrefersReducedTransparency),
+        keyword_evaluator!(
+            eval_prefers_reduced_transparency,
+            PrefersReducedTransparency
+        ),
         FeatureFlags::empty(),
     ),
     feature!(
diff --git a/components/style/gecko/media_queries.rs b/components/style/gecko/media_queries.rs
index abd9f8af5e1..508e714e3c9 100644
--- a/components/style/gecko/media_queries.rs
+++ b/components/style/gecko/media_queries.rs
@@ -73,10 +73,7 @@ impl fmt::Debug for Device {
 
         let mut doc_uri = nsCString::new();
         unsafe {
-            bindings::Gecko_nsIURI_Debug(
-                (*self.document()).mDocumentURI.raw(),
-                &mut doc_uri,
-            )
+            bindings::Gecko_nsIURI_Debug((*self.document()).mDocumentURI.raw(), &mut doc_uri)
         };
 
         f.debug_struct("Device")
@@ -132,13 +129,12 @@ impl Device {
                 pres_context.map_or(std::ptr::null(), |pc| pc),
                 vertical,
                 &**font,
-                element.map_or(std::ptr::null(), |e| e.0)
+                element.map_or(std::ptr::null(), |e| e.0),
             )
         });
         NonNegativeLength::new(au.to_f32_px())
     }
 
-
     /// Tells the device that a new viewport rule has been found, and stores the
     /// relevant viewport constraints.
     pub fn account_for_viewport_rule(&mut self, _constraints: &ViewportConstraints) {
@@ -208,9 +204,7 @@ impl Device {
             // XXX: we could have a more reasonable default perhaps.
             None => return Length::new(0.0),
         };
-        Length::new(unsafe {
-            bindings::Gecko_GetScrollbarInlineSize(pc)
-        })
+        Length::new(unsafe { bindings::Gecko_GetScrollbarInlineSize(pc) })
     }
 
     /// Queries font metrics
diff --git a/components/style/gecko/pseudo_element.rs b/components/style/gecko/pseudo_element.rs
index c5b2686b958..d0c47d51a41 100644
--- a/components/style/gecko/pseudo_element.rs
+++ b/components/style/gecko/pseudo_element.rs
@@ -14,8 +14,8 @@ use crate::properties::{ComputedValues, PropertyFlags};
 use crate::selector_parser::{PseudoElementCascadeType, SelectorImpl};
 use crate::str::{starts_with_ignore_ascii_case, string_as_ascii_lowercase};
 use crate::string_cache::Atom;
-use crate::values::AtomIdent;
 use crate::values::serialize_atom_identifier;
+use crate::values::AtomIdent;
 use cssparser::ToCss;
 use static_prefs::pref;
 use std::fmt;
@@ -159,7 +159,7 @@ impl PseudoElement {
     pub fn highlight_name(&self) -> Option<&AtomIdent> {
         match &*self {
             PseudoElement::Highlight(name) => Some(&name),
-            _ => None
+            _ => None,
         }
     }
 
@@ -178,7 +178,7 @@ impl PseudoElement {
         if self.is_highlight() && !pref!("dom.customHighlightAPI.enabled") {
             return false;
         }
-        return self.flags() & structs::CSS_PSEUDO_ELEMENT_ENABLED_IN_UA_SHEETS_AND_CHROME == 0
+        return self.flags() & structs::CSS_PSEUDO_ELEMENT_ENABLED_IN_UA_SHEETS_AND_CHROME == 0;
     }
 
     /// Whether this pseudo is enabled explicitly in UA sheets.
diff --git a/components/style/gecko/wrapper.rs b/components/style/gecko/wrapper.rs
index eb3ab03c73c..3396d3ca583 100644
--- a/components/style/gecko/wrapper.rs
+++ b/components/style/gecko/wrapper.rs
@@ -59,8 +59,8 @@ use crate::selector_parser::{AttrValue, Lang};
 use crate::shared_lock::{Locked, SharedRwLock};
 use crate::string_cache::{Atom, Namespace, WeakAtom, WeakNamespace};
 use crate::stylist::CascadeData;
-use crate::values::{AtomIdent, AtomString};
 use crate::values::computed::Display;
+use crate::values::{AtomIdent, AtomString};
 use crate::CaseSensitivityExt;
 use crate::LocalName;
 use app_units::Au;
@@ -321,7 +321,7 @@ impl<'ln> GeckoNode<'ln> {
     #[inline]
     fn is_in_shadow_tree(&self) -> bool {
         use crate::gecko_bindings::structs::NODE_IS_IN_SHADOW_TREE;
-        self.flags() & NODE_IS_IN_SHADOW_TREE  != 0
+        self.flags() & NODE_IS_IN_SHADOW_TREE != 0
     }
 
     /// Returns true if we know for sure that `flattened_tree_parent` and `parent_node` return the
@@ -824,9 +824,8 @@ impl<'le> GeckoElement<'le> {
         let mut map = FxHashMap::with_capacity_and_hasher(collection_length, Default::default());
 
         for i in 0..collection_length {
-            let end_value = unsafe {
-                Arc::from_raw_addrefed(Gecko_ElementTransitions_EndValueAt(self.0, i))
-            };
+            let end_value =
+                unsafe { Arc::from_raw_addrefed(Gecko_ElementTransitions_EndValueAt(self.0, i)) };
             let property = end_value.id();
             debug_assert!(!property.is_logical());
             map.insert(property, end_value);
@@ -918,13 +917,7 @@ fn get_animation_rule(
         effect_count.min(ANIMATABLE_PROPERTY_COUNT),
         Default::default(),
     );
-    if unsafe {
-        Gecko_GetAnimationRule(
-            element.0,
-            cascade_level,
-            &mut animation_values,
-        )
-    } {
+    if unsafe { Gecko_GetAnimationRule(element.0, cascade_level, &mut animation_values) } {
         let shared_lock = &GLOBAL_STYLE_DATA.shared_lock;
         Some(Arc::new(shared_lock.wrap(
             PropertyDeclarationBlock::from_animation_value_map(&animation_values),
@@ -1326,9 +1319,12 @@ impl<'le> TElement for GeckoElement<'le> {
     /// pseudo-elements).
     #[inline]
     fn matches_user_and_content_rules(&self) -> bool {
-        use crate::gecko_bindings::structs::{NODE_IS_IN_NATIVE_ANONYMOUS_SUBTREE, NODE_HAS_BEEN_IN_UA_WIDGET};
+        use crate::gecko_bindings::structs::{
+            NODE_HAS_BEEN_IN_UA_WIDGET, NODE_IS_IN_NATIVE_ANONYMOUS_SUBTREE,
+        };
         let flags = self.flags();
-        (flags & NODE_IS_IN_NATIVE_ANONYMOUS_SUBTREE) == 0 || (flags & NODE_HAS_BEEN_IN_UA_WIDGET) != 0
+        (flags & NODE_IS_IN_NATIVE_ANONYMOUS_SUBTREE) == 0 ||
+            (flags & NODE_HAS_BEEN_IN_UA_WIDGET) != 0
     }
 
     #[inline]
@@ -1508,7 +1504,9 @@ impl<'le> TElement for GeckoElement<'le> {
             transitions_to_keep.insert(physical_longhand);
             if self.needs_transitions_update_per_property(
                 physical_longhand,
-                after_change_ui_style.transition_combined_duration_at(transition_property.index).seconds(),
+                after_change_ui_style
+                    .transition_combined_duration_at(transition_property.index)
+                    .seconds(),
                 before_change_style,
                 after_change_style,
                 &existing_transitions,
@@ -2096,7 +2094,12 @@ impl<'le> ::selectors::Element for GeckoElement<'le> {
                     );
                     return false;
                 }
-                if context.extra_data.invalidation_data.document_state.intersects(state_bit) {
+                if context
+                    .extra_data
+                    .invalidation_data
+                    .document_state
+                    .intersects(state_bit)
+                {
                     return !context.in_negation();
                 }
                 self.document_state().contains(state_bit)
diff --git a/components/style/invalidation/element/invalidator.rs b/components/style/invalidation/element/invalidator.rs
index db644d1a449..00f714c5b15 100644
--- a/components/style/invalidation/element/invalidator.rs
+++ b/components/style/invalidation/element/invalidator.rs
@@ -402,7 +402,9 @@ where
             );
 
             if invalidated_sibling {
-                sibling_invalidator.processor.invalidated_sibling(sibling, self.element);
+                sibling_invalidator
+                    .processor
+                    .invalidated_sibling(sibling, self.element);
             }
 
             any_invalidated |= invalidated_sibling;
diff --git a/components/style/invalidation/element/restyle_hints.rs b/components/style/invalidation/element/restyle_hints.rs
index 6020e429ec6..ffadecd7aa2 100644
--- a/components/style/invalidation/element/restyle_hints.rs
+++ b/components/style/invalidation/element/restyle_hints.rs
@@ -143,7 +143,11 @@ impl RestyleHint {
     /// be replaced.
     #[inline]
     pub fn has_animation_hint_or_recascade(&self) -> bool {
-        self.intersects(Self::for_animations() | Self::RECASCADE_SELF | Self::RECASCADE_SELF_IF_INHERIT_RESET_STYLE)
+        self.intersects(
+            Self::for_animations() |
+                Self::RECASCADE_SELF |
+                Self::RECASCADE_SELF_IF_INHERIT_RESET_STYLE,
+        )
     }
 
     /// Returns whether the hint specifies some restyle work other than an
diff --git a/components/style/invalidation/element/state_and_attributes.rs b/components/style/invalidation/element/state_and_attributes.rs
index 9758ae244d9..bd69f35c66c 100644
--- a/components/style/invalidation/element/state_and_attributes.rs
+++ b/components/style/invalidation/element/state_and_attributes.rs
@@ -136,7 +136,11 @@ where
             return;
         }
     }
-    debug_assert!(false, "Should've found {:?} as an ancestor of {:?}", ancestor, child);
+    debug_assert!(
+        false,
+        "Should've found {:?} as an ancestor of {:?}",
+        ancestor, child
+    );
 }
 
 /// Propagates the bits after invalidating a descendant child, if needed.
@@ -169,13 +173,20 @@ pub fn invalidated_sibling<E>(element: E, of: E)
 where
     E: TElement,
 {
-    debug_assert_eq!(element.as_node().parent_node(), of.as_node().parent_node(), "Should be siblings");
+    debug_assert_eq!(
+        element.as_node().parent_node(),
+        of.as_node().parent_node(),
+        "Should be siblings"
+    );
     if !invalidated_self(element) {
         return;
     }
     if element.traversal_parent() != of.traversal_parent() {
         let parent = element.as_node().parent_element_or_host();
-        debug_assert!(parent.is_some(), "How can we have siblings without parent nodes?");
+        debug_assert!(
+            parent.is_some(),
+            "How can we have siblings without parent nodes?"
+        );
         if let Some(e) = parent {
             propagate_dirty_bit_up_to(e, element)
         }
diff --git a/components/style/invalidation/viewport_units.rs b/components/style/invalidation/viewport_units.rs
index 75a3aad24ba..06faeb14c46 100644
--- a/components/style/invalidation/viewport_units.rs
+++ b/components/style/invalidation/viewport_units.rs
@@ -36,7 +36,10 @@ where
     let usage = data.styles.viewport_unit_usage();
     let uses_viewport_units = usage != ViewportUnitUsage::None;
     if uses_viewport_units {
-        debug!("invalidate_recursively: {:?} uses viewport units {:?}", element, usage);
+        debug!(
+            "invalidate_recursively: {:?} uses viewport units {:?}",
+            element, usage
+        );
     }
 
     match usage {
@@ -46,7 +49,7 @@ where
         },
         ViewportUnitUsage::FromDeclaration => {
             data.hint.insert(RestyleHint::RECASCADE_SELF);
-        }
+        },
     }
 
     let mut any_children_invalid = false;
diff --git a/components/style/media_queries/media_list.rs b/components/style/media_queries/media_list.rs
index dc9a131d247..3c2ba9ee5c1 100644
--- a/components/style/media_queries/media_list.rs
+++ b/components/style/media_queries/media_list.rs
@@ -10,8 +10,8 @@ use super::{Device, MediaQuery, Qualifier};
 use crate::context::QuirksMode;
 use crate::error_reporting::ContextualParseError;
 use crate::parser::ParserContext;
-use crate::values::computed;
 use crate::queries::condition::KleeneValue;
+use crate::values::computed;
 use cssparser::{Delimiter, Parser};
 use cssparser::{ParserInput, Token};
 
@@ -83,7 +83,9 @@ impl MediaList {
         computed::Context::for_media_query_evaluation(device, quirks_mode, |context| {
             self.media_queries.iter().any(|mq| {
                 let mut query_match = if mq.media_type.matches(device.media_type()) {
-                    mq.condition.as_ref().map_or(KleeneValue::True, |c| c.matches(context))
+                    mq.condition
+                        .as_ref()
+                        .map_or(KleeneValue::True, |c| c.matches(context))
                 } else {
                     KleeneValue::False
                 };
diff --git a/components/style/media_queries/media_query.rs b/components/style/media_queries/media_query.rs
index c1ec2fd2a6e..c30a4453930 100644
--- a/components/style/media_queries/media_query.rs
+++ b/components/style/media_queries/media_query.rs
@@ -120,7 +120,9 @@ impl MediaQuery {
     /// Returns whether this media query depends on the viewport.
     pub fn is_viewport_dependent(&self) -> bool {
         self.condition.as_ref().map_or(false, |c| {
-            return c.cumulative_flags().contains(FeatureFlags::VIEWPORT_DEPENDENT)
+            return c
+                .cumulative_flags()
+                .contains(FeatureFlags::VIEWPORT_DEPENDENT);
         })
     }
 
diff --git a/components/style/parser.rs b/components/style/parser.rs
index cb97f12d368..8d8d408f53f 100644
--- a/components/style/parser.rs
+++ b/components/style/parser.rs
@@ -85,7 +85,11 @@ impl<'a> ParserContext<'a> {
     }
 
     /// Temporarily sets the rule_type and executes the callback function, returning its result.
-    pub fn nest_for_rule<R>(&mut self, rule_type: CssRuleType, cb: impl FnOnce(&mut Self) -> R) -> R {
+    pub fn nest_for_rule<R>(
+        &mut self,
+        rule_type: CssRuleType,
+        cb: impl FnOnce(&mut Self) -> R,
+    ) -> R {
         let old_rule_types = self.rule_types;
         self.rule_types.insert(rule_type);
         let r = cb(self);
diff --git a/components/style/properties/cascade.rs b/components/style/properties/cascade.rs
index 0b3b2a71c39..4cd0a2c273d 100644
--- a/components/style/properties/cascade.rs
+++ b/components/style/properties/cascade.rs
@@ -370,7 +370,7 @@ where
             } else {
                 LonghandIdSet::late_group()
             }
-        }
+        },
     };
 
     cascade.apply_properties(
@@ -430,7 +430,10 @@ fn tweak_when_ignoring_colors(
 
     // Always honor colors if forced-color-adjust is set to none.
     #[cfg(feature = "gecko")] {
-        let forced = context.builder.get_inherited_text().clone_forced_color_adjust();
+        let forced = context
+            .builder
+            .get_inherited_text()
+            .clone_forced_color_adjust();
         if forced == computed::ForcedColorAdjust::None {
             return;
         }
@@ -439,7 +442,10 @@ fn tweak_when_ignoring_colors(
     // Don't override background-color on ::-moz-color-swatch. It is set as an
     // author style (via the style attribute), but it's pretty important for it
     // to show up for obvious reasons :)
-    if context.builder.pseudo.map_or(false, |p| p.is_color_swatch()) &&
+    if context
+        .builder
+        .pseudo
+        .map_or(false, |p| p.is_color_swatch()) &&
         longhand_id == LonghandId::BackgroundColor
     {
         return;
@@ -482,13 +488,22 @@ fn tweak_when_ignoring_colors(
         },
         PropertyDeclaration::Color(ref color) => {
             // We honor color: transparent and system colors.
-            if color.0.honored_in_forced_colors_mode(/* allow_transparent = */ true) {
+            if color
+                .0
+                .honored_in_forced_colors_mode(/* allow_transparent = */ true)
+            {
                 return;
             }
             // If the inherited color would be transparent, but we would
             // override this with a non-transparent color, then override it with
             // the default color. Otherwise just let it inherit through.
-            if context.builder.get_parent_inherited_text().clone_color().alpha == 0.0 {
+            if context
+                .builder
+                .get_parent_inherited_text()
+                .clone_color()
+                .alpha ==
+                0.0
+            {
                 let color = context.builder.device.default_color();
                 declarations_to_apply_unless_overriden.push(PropertyDeclaration::Color(
                     specified::ColorPropertyValue(color.into()),
@@ -500,7 +515,11 @@ fn tweak_when_ignoring_colors(
         PropertyDeclaration::BackgroundImage(ref bkg) => {
             use crate::values::generics::image::Image;
             if static_prefs::pref!("browser.display.permit_backplate") {
-                if bkg.0.iter().all(|image| matches!(*image, Image::Url(..) | Image::None)) {
+                if bkg
+                    .0
+                    .iter()
+                    .all(|image| matches!(*image, Image::Url(..) | Image::None))
+                {
                     return;
                 }
             }
@@ -632,7 +651,8 @@ impl<'a, 'b: 'a> Cascade<'a, 'b> {
             return false;
         }
 
-        let can_have_logical_properties = can_have_logical_properties == CanHaveLogicalProperties::Yes;
+        let can_have_logical_properties =
+            can_have_logical_properties == CanHaveLogicalProperties::Yes;
 
         let ignore_colors = !self.context.builder.device.use_document_colors();
         let mut declarations_to_apply_unless_overriden = DeclarationsToApplyUnlessOverriden::new();
@@ -662,7 +682,9 @@ impl<'a, 'b: 'a> Cascade<'a, 'b> {
             }
 
             if self.reverted_set.contains(physical_longhand_id) {
-                if let Some(&(reverted_priority, is_origin_revert)) = self.reverted.get(&physical_longhand_id) {
+                if let Some(&(reverted_priority, is_origin_revert)) =
+                    self.reverted.get(&physical_longhand_id)
+                {
                     if !reverted_priority.allows_when_reverted(&priority, is_origin_revert) {
                         continue;
                     }
@@ -691,14 +713,14 @@ impl<'a, 'b: 'a> Cascade<'a, 'b> {
 
             let is_unset = match declaration.get_css_wide_keyword() {
                 Some(keyword) => match keyword {
-                    CSSWideKeyword::RevertLayer |
-                    CSSWideKeyword::Revert => {
+                    CSSWideKeyword::RevertLayer | CSSWideKeyword::Revert => {
                         let origin_revert = keyword == CSSWideKeyword::Revert;
                         // We intentionally don't want to insert it into
                         // `self.seen`, `reverted` takes care of rejecting other
                         // declarations as needed.
                         self.reverted_set.insert(physical_longhand_id);
-                        self.reverted.insert(physical_longhand_id, (priority, origin_revert));
+                        self.reverted
+                            .insert(physical_longhand_id, (priority, origin_revert));
                         continue;
                     },
                     CSSWideKeyword::Unset => true,
@@ -834,12 +856,18 @@ impl<'a, 'b: 'a> Cascade<'a, 'b> {
         }
 
         #[cfg(feature = "gecko")]
-        if self.author_specified.contains(LonghandId::FontSynthesisWeight) {
+        if self
+            .author_specified
+            .contains(LonghandId::FontSynthesisWeight)
+        {
             builder.add_flags(ComputedValueFlags::HAS_AUTHOR_SPECIFIED_FONT_SYNTHESIS_WEIGHT);
         }
 
         #[cfg(feature = "gecko")]
-        if self.author_specified.contains(LonghandId::FontSynthesisStyle) {
+        if self
+            .author_specified
+            .contains(LonghandId::FontSynthesisStyle)
+        {
             builder.add_flags(ComputedValueFlags::HAS_AUTHOR_SPECIFIED_FONT_SYNTHESIS_STYLE);
         }
 
@@ -918,7 +946,10 @@ impl<'a, 'b: 'a> Cascade<'a, 'b> {
             };
 
             let initial_generic = font.mFont.family.families.single_generic();
-            debug_assert!(initial_generic.is_some(), "Initial font should be just one generic font");
+            debug_assert!(
+                initial_generic.is_some(),
+                "Initial font should be just one generic font"
+            );
             if initial_generic == Some(default_font_type) {
                 return;
             }
@@ -927,7 +958,8 @@ impl<'a, 'b: 'a> Cascade<'a, 'b> {
         };
 
         // NOTE: Leaves is_initial untouched.
-        builder.mutate_font().mFont.family.families = FontFamily::generic(default_font_type).families.clone();
+        builder.mutate_font().mFont.family.families =
+            FontFamily::generic(default_font_type).families.clone();
     }
 
     /// Prioritize user fonts if needed by pref.
@@ -1107,7 +1139,8 @@ impl<'a, 'b: 'a> Cascade<'a, 'b> {
             let mut b = computed_math_depth;
             let c = SCALE_FACTOR_WHEN_INCREMENTING_MATH_DEPTH_BY_ONE;
             let scale_between_0_and_1 = parent_script_percent_scale_down.unwrap_or_else(|| c);
-            let scale_between_0_and_2 = parent_script_script_percent_scale_down.unwrap_or_else(|| c * c);
+            let scale_between_0_and_2 =
+                parent_script_script_percent_scale_down.unwrap_or_else(|| c * c);
             let mut s = 1.0;
             let mut invert_scale_factor = false;
             if a == b {
@@ -1156,7 +1189,8 @@ impl<'a, 'b: 'a> Cascade<'a, 'b> {
             // the default scale, use MathML3's implementation for backward
             // compatibility. Otherwise, follow MathML Core's algorithm.
             let scale = if parent_font.mScriptSizeMultiplier !=
-                SCALE_FACTOR_WHEN_INCREMENTING_MATH_DEPTH_BY_ONE {
+                SCALE_FACTOR_WHEN_INCREMENTING_MATH_DEPTH_BY_ONE
+            {
                 (parent_font.mScriptSizeMultiplier as f32).powi(delta as i32)
             } else {
                 // Script scale factors are independent of orientation.
diff --git a/components/style/properties/declaration_block.rs b/components/style/properties/declaration_block.rs
index 77b359b5d3d..90845af311a 100644
--- a/components/style/properties/declaration_block.rs
+++ b/components/style/properties/declaration_block.rs
@@ -594,9 +594,8 @@ impl PropertyDeclarationBlock {
                 .all_shorthand
                 .declarations()
                 .any(|decl| {
-                    !self.contains(decl.id())
-                        || self
-                            .declarations
+                    !self.contains(decl.id()) ||
+                        self.declarations
                             .iter()
                             .enumerate()
                             .find(|&(_, ref d)| d.id() == decl.id())
@@ -638,9 +637,9 @@ impl PropertyDeclarationBlock {
                                     }
                                     return DeclarationUpdate::UpdateInPlace { pos };
                                 }
-                                if !needs_append
-                                    && id.logical_group() == Some(logical_group)
-                                    && id.is_logical() != longhand_id.is_logical()
+                                if !needs_append &&
+                                    id.logical_group() == Some(logical_group) &&
+                                    id.is_logical() != longhand_id.is_logical()
                                 {
                                     needs_append = true;
                                 }
@@ -1428,7 +1427,8 @@ impl<'i> DeclarationParserState<'i> {
         };
         // In case there is still unparsed text in the declaration, we should roll back.
         input.expect_exhausted()?;
-        self.output_block.extend(self.declarations.drain(), self.importance);
+        self.output_block
+            .extend(self.declarations.drain(), self.importance);
         // We've successfully parsed a declaration, so forget about
         // `last_parsed_property_id`. It'd be wrong to associate any
         // following error with this property.
diff --git a/components/style/properties/mod.rs b/components/style/properties/mod.rs
index c6fe96c3938..9eb567ca6f6 100644
--- a/components/style/properties/mod.rs
+++ b/components/style/properties/mod.rs
@@ -4,8 +4,8 @@
 
 //! Supported CSS properties and the cascade.
 
-pub mod declaration_block;
 pub mod cascade;
+pub mod declaration_block;
 
 /// The CSS properties supported by the style system.
 /// Generated from the properties.mako.rs template by build.rs
diff --git a/components/style/queries/condition.rs b/components/style/queries/condition.rs
index 56822c914a7..e17e6abd2e7 100644
--- a/components/style/queries/condition.rs
+++ b/components/style/queries/condition.rs
@@ -310,9 +310,10 @@ impl QueryCondition {
                         // We're about to swallow the error in a `<general-enclosed>`
                         // condition, so report it while we can.
                         let loc = e.location;
-                        let error = ContextualParseError::InvalidMediaRule(input.slice_from(start), e);
+                        let error =
+                            ContextualParseError::InvalidMediaRule(input.slice_from(start), e);
                         context.log_css_error(loc, error);
-                    }
+                    },
                 }
             },
             Token::Function(..) => {
diff --git a/components/style/queries/feature.rs b/components/style/queries/feature.rs
index 0a85d7a245f..e8fd62284bd 100644
--- a/components/style/queries/feature.rs
+++ b/components/style/queries/feature.rs
@@ -4,11 +4,11 @@
 
 //! Query features.
 
+use super::condition::KleeneValue;
 use crate::parser::ParserContext;
 use crate::values::computed::{self, CSSPixelLength, Ratio, Resolution};
 use crate::Atom;
 use cssparser::Parser;
-use super::condition::KleeneValue;
 use std::fmt;
 use style_traits::ParseError;
 
diff --git a/components/style/queries/feature_expression.rs b/components/style/queries/feature_expression.rs
index 7a31397b989..a3f067c923a 100644
--- a/components/style/queries/feature_expression.rs
+++ b/components/style/queries/feature_expression.rs
@@ -651,7 +651,7 @@ impl QueryFeatureExpression {
                     .kind
                     .non_ranged_value()
                     .map(|v| *expect!(Enumerated, v));
-                return evaluator(context, computed)
+                return evaluator(context, computed);
             },
             Evaluator::BoolInteger(eval) => {
                 let computed = self
diff --git a/components/style/sharing/mod.rs b/components/style/sharing/mod.rs
index e376a6da412..31a9587a853 100644
--- a/components/style/sharing/mod.rs
+++ b/components/style/sharing/mod.rs
@@ -66,8 +66,8 @@
 
 use crate::applicable_declarations::ApplicableDeclarationBlock;
 use crate::bloom::StyleBloom;
-use crate::context::{SharedStyleContext, StyleContext};
 use crate::computed_value_flags::ComputedValueFlags;
+use crate::context::{SharedStyleContext, StyleContext};
 use crate::dom::{SendElement, TElement};
 use crate::properties::ComputedValues;
 use crate::rule_tree::StrongRuleNode;
diff --git a/components/style/style_adjuster.rs b/components/style/style_adjuster.rs
index e6ace1864bf..5f169429949 100644
--- a/components/style/style_adjuster.rs
+++ b/components/style/style_adjuster.rs
@@ -293,10 +293,7 @@ impl<'a, 'b: 'a> StyleAdjuster<'a, 'b> {
                 .add_flags(ComputedValueFlags::SELF_OR_ANCESTOR_HAS_CONTAIN_STYLE);
         }
 
-        if box_style
-            .clone_container_type()
-            .is_size_container_type()
-        {
+        if box_style.clone_container_type().is_size_container_type() {
             self.style
                 .add_flags(ComputedValueFlags::SELF_OR_ANCESTOR_HAS_SIZE_CONTAINER_TYPE);
         }
@@ -446,7 +443,9 @@ impl<'a, 'b: 'a> StyleAdjuster<'a, 'b> {
         if !column_style.column_rule_has_nonzero_width() {
             return;
         }
-        self.style.mutate_column().set_column_rule_width(crate::Zero::zero());
+        self.style
+            .mutate_column()
+            .set_column_rule_width(crate::Zero::zero());
     }
 
     /// outline-style: none causes a computed outline-width of zero at computed
@@ -459,7 +458,9 @@ impl<'a, 'b: 'a> StyleAdjuster<'a, 'b> {
         if !outline.outline_has_nonzero_width() {
             return;
         }
-        self.style.mutate_outline().set_outline_width(crate::Zero::zero());
+        self.style
+            .mutate_outline()
+            .set_outline_width(crate::Zero::zero());
     }
 
     /// CSS overflow-x and overflow-y require some fixup as well in some cases.
@@ -484,7 +485,10 @@ impl<'a, 'b: 'a> StyleAdjuster<'a, 'b> {
     #[cfg(feature = "gecko")]
     fn adjust_for_contain(&mut self) {
         let box_style = self.style.get_box();
-        debug_assert_eq!(box_style.clone_contain(), box_style.clone_effective_containment());
+        debug_assert_eq!(
+            box_style.clone_contain(),
+            box_style.clone_effective_containment()
+        );
         let container_type = box_style.clone_container_type();
         let content_visibility = box_style.clone_content_visibility();
         if container_type == ContainerType::Normal &&
@@ -499,28 +503,33 @@ impl<'a, 'b: 'a> StyleAdjuster<'a, 'b> {
             // `content-visibility:auto` also applies size containment when content
             // is not relevant (and therefore skipped). This is checked in
             // nsIFrame::GetContainSizeAxes.
-            ContentVisibility::Auto => new_contain.insert(
-                Contain::LAYOUT | Contain::PAINT | Contain::STYLE),
-            ContentVisibility::Hidden => new_contain.insert(
-                Contain::LAYOUT | Contain::PAINT | Contain::SIZE | Contain::STYLE),
+            ContentVisibility::Auto => {
+                new_contain.insert(Contain::LAYOUT | Contain::PAINT | Contain::STYLE)
+            },
+            ContentVisibility::Hidden => new_contain
+                .insert(Contain::LAYOUT | Contain::PAINT | Contain::SIZE | Contain::STYLE),
         }
         match container_type {
             ContainerType::Normal => {},
             // https://drafts.csswg.org/css-contain-3/#valdef-container-type-inline-size:
             //     Applies layout containment, style containment, and inline-size
             //     containment to the principal box.
-            ContainerType::InlineSize => new_contain.insert(
-                Contain::LAYOUT | Contain::STYLE | Contain::INLINE_SIZE),
+            ContainerType::InlineSize => {
+                new_contain.insert(Contain::LAYOUT | Contain::STYLE | Contain::INLINE_SIZE)
+            },
             // https://drafts.csswg.org/css-contain-3/#valdef-container-type-size:
             //     Applies layout containment, style containment, and size
             //     containment to the principal box.
-            ContainerType::Size => new_contain.insert(
-                Contain::LAYOUT | Contain::STYLE | Contain::SIZE),
+            ContainerType::Size => {
+                new_contain.insert(Contain::LAYOUT | Contain::STYLE | Contain::SIZE)
+            },
         }
         if new_contain == old_contain {
             return;
         }
-        self.style.mutate_box().set_effective_containment(new_contain);
+        self.style
+            .mutate_box()
+            .set_effective_containment(new_contain);
     }
 
     /// Handles the relevant sections in:
diff --git a/components/style/style_resolver.rs b/components/style/style_resolver.rs
index bd120159a0d..a082b2cbfff 100644
--- a/components/style/style_resolver.rs
+++ b/components/style/style_resolver.rs
@@ -420,7 +420,10 @@ where
         originating_element_style: &PrimaryStyle,
         layout_parent_style: Option<&ComputedValues>,
     ) -> Option<ResolvedStyle> {
-        let MatchingResults { rule_node, mut flags } = self.match_pseudo(
+        let MatchingResults {
+            rule_node,
+            mut flags,
+        } = self.match_pseudo(
             &originating_element_style.style.0,
             pseudo,
             VisitedHandlingMode::AllLinksUnvisited,
@@ -428,14 +431,16 @@ where
 
         let mut visited_rules = None;
         if originating_element_style.style().visited_style().is_some() {
-            visited_rules = self.match_pseudo(
-                &originating_element_style.style.0,
-                pseudo,
-                VisitedHandlingMode::RelevantLinkVisited,
-            ).map(|results| {
-                flags |= results.flags;
-                results.rule_node
-            });
+            visited_rules = self
+                .match_pseudo(
+                    &originating_element_style.style.0,
+                    pseudo,
+                    VisitedHandlingMode::RelevantLinkVisited,
+                )
+                .map(|results| {
+                    flags |= results.flags;
+                    results.rule_node
+                });
         }
 
         Some(self.cascade_style_and_visited(
@@ -553,8 +558,7 @@ where
             self.context.shared.quirks_mode(),
             NeedsSelectorFlags::Yes,
         );
-        matching_context.extra_data.originating_element_style =
-            Some(originating_element_style);
+        matching_context.extra_data.originating_element_style = Some(originating_element_style);
 
         // NB: We handle animation rules for ::before and ::after when
         // traversing them.
diff --git a/components/style/stylesheets/document_rule.rs b/components/style/stylesheets/document_rule.rs
index 871c7a791ed..75edab308db 100644
--- a/components/style/stylesheets/document_rule.rs
+++ b/components/style/stylesheets/document_rule.rs
@@ -13,7 +13,7 @@ use crate::shared_lock::{SharedRwLock, SharedRwLockReadGuard, ToCssWithGuard};
 use crate::str::CssStringWriter;
 use crate::stylesheets::CssRules;
 use crate::values::CssUrl;
-use cssparser::{Parser, SourceLocation, BasicParseErrorKind};
+use cssparser::{BasicParseErrorKind, Parser, SourceLocation};
 #[cfg(feature = "gecko")]
 use malloc_size_of::{MallocSizeOfOps, MallocUnconditionalShallowSizeOf};
 use servo_arc::Arc;
@@ -260,9 +260,7 @@ impl DocumentCondition {
 
         let condition = DocumentCondition(conditions);
         if !condition.allowed_in(context) {
-            return Err(input.new_error(BasicParseErrorKind::AtRuleInvalid(
-                "-moz-document".into(),
-            )));
+            return Err(input.new_error(BasicParseErrorKind::AtRuleInvalid("-moz-document".into())));
         }
         Ok(condition)
     }
diff --git a/components/style/stylesheets/font_feature_values_rule.rs b/components/style/stylesheets/font_feature_values_rule.rs
index f6ea3a1f477..06016ec2bd9 100644
--- a/components/style/stylesheets/font_feature_values_rule.rs
+++ b/components/style/stylesheets/font_feature_values_rule.rs
@@ -19,8 +19,8 @@ use crate::values::computed::font::FamilyName;
 use crate::values::serialize_atom_identifier;
 use crate::Atom;
 use cssparser::{
-    AtRuleParser, BasicParseErrorKind, CowRcStr, RuleBodyParser, RuleBodyItemParser, Parser,
-    ParserState, QualifiedRuleParser, DeclarationParser, SourceLocation, Token,
+    AtRuleParser, BasicParseErrorKind, CowRcStr, DeclarationParser, Parser, ParserState,
+    QualifiedRuleParser, RuleBodyItemParser, RuleBodyParser, SourceLocation, Token,
 };
 use std::fmt::{self, Write};
 use style_traits::{CssWriter, ParseError, StyleParseErrorKind, ToCss};
@@ -222,12 +222,17 @@ where
     }
 }
 
-impl<'a, 'b, 'i, T> RuleBodyItemParser<'i, (), StyleParseErrorKind<'i>> for FFVDeclarationsParser<'a, 'b, T>
+impl<'a, 'b, 'i, T> RuleBodyItemParser<'i, (), StyleParseErrorKind<'i>>
+    for FFVDeclarationsParser<'a, 'b, T>
 where
     T: Parse,
 {
-    fn parse_declarations(&self) -> bool { true }
-    fn parse_qualified(&self) -> bool { false }
+    fn parse_declarations(&self) -> bool {
+        true
+    }
+    fn parse_qualified(&self) -> bool {
+        false
+    }
 }
 
 macro_rules! font_feature_values_blocks {
diff --git a/components/style/stylesheets/import_rule.rs b/components/style/stylesheets/import_rule.rs
index 6af4e0bf93e..9c69a27a595 100644
--- a/components/style/stylesheets/import_rule.rs
+++ b/components/style/stylesheets/import_rule.rs
@@ -13,8 +13,8 @@ use crate::shared_lock::{
 };
 use crate::str::CssStringWriter;
 use crate::stylesheets::{
-    layer_rule::LayerName, supports_rule::SupportsCondition, CssRule,
-    CssRuleType, StylesheetInDocument,
+    layer_rule::LayerName, supports_rule::SupportsCondition, CssRule, CssRuleType,
+    StylesheetInDocument,
 };
 use crate::values::CssUrl;
 use cssparser::{Parser, SourceLocation};
@@ -258,7 +258,8 @@ impl ImportRule {
                         .parse_nested_block(|input| LayerName::parse(context, input))
                         .map(|name| ImportLayer::Named(name))
                 })
-                .ok().unwrap_or(ImportLayer::None)
+                .ok()
+                .unwrap_or(ImportLayer::None)
         };
 
         #[cfg(feature = "gecko")]
@@ -272,9 +273,8 @@ impl ImportRule {
             input
                 .try_parse(SupportsCondition::parse_for_import)
                 .map(|condition| {
-                    let enabled = context.nest_for_rule(CssRuleType::Style, |context| {
-                        condition.eval(context)
-                    });
+                    let enabled = context
+                        .nest_for_rule(CssRuleType::Style, |context| condition.eval(context));
                     ImportSupportsCondition { condition, enabled }
                 })
                 .ok()
diff --git a/components/style/stylesheets/keyframes_rule.rs b/components/style/stylesheets/keyframes_rule.rs
index 9b4caaa0fd6..6e5016080e9 100644
--- a/components/style/stylesheets/keyframes_rule.rs
+++ b/components/style/stylesheets/keyframes_rule.rs
@@ -23,8 +23,8 @@ use cssparser::{
     QualifiedRuleParser, RuleBodyItemParser, RuleBodyParser, SourceLocation, Token,
 };
 use servo_arc::Arc;
-use std::fmt::{self, Write};
 use std::borrow::Cow;
+use std::fmt::{self, Write};
 use style_traits::{CssWriter, ParseError, ParsingMode, StyleParseErrorKind, ToCss};
 
 /// A [`@keyframes`][keyframes] rule.
@@ -545,7 +545,9 @@ pub fn parse_keyframe_list<'a>(
         shared_lock,
         declarations: &mut declarations,
     };
-    RuleBodyParser::new(input, &mut parser).filter_map(Result::ok) .collect()
+    RuleBodyParser::new(input, &mut parser)
+        .filter_map(Result::ok)
+        .collect()
 }
 
 impl<'a, 'b, 'i> AtRuleParser<'i> for KeyframeListParser<'a, 'b> {
@@ -588,28 +590,31 @@ impl<'a, 'b, 'i> QualifiedRuleParser<'i> for KeyframeListParser<'a, 'b> {
     ) -> Result<Self::QualifiedRule, ParseError<'i>> {
         let mut block = PropertyDeclarationBlock::new();
         let declarations = &mut self.declarations;
-        self.context.nest_for_rule(CssRuleType::Keyframe, |context| {
-            let mut parser = KeyframeDeclarationParser {
-                context: &context,
-                declarations,
-            };
-            let mut iter = RuleBodyParser::new(input, &mut parser);
-            while let Some(declaration) = iter.next() {
-                match declaration {
-                    Ok(()) => {
-                        block.extend(iter.parser.declarations.drain(), Importance::Normal);
-                    },
-                    Err((error, slice)) => {
-                        iter.parser.declarations.clear();
-                        let location = error.location;
-                        let error =
-                            ContextualParseError::UnsupportedKeyframePropertyDeclaration(slice, error);
-                        context.log_css_error(location, error);
-                    },
+        self.context
+            .nest_for_rule(CssRuleType::Keyframe, |context| {
+                let mut parser = KeyframeDeclarationParser {
+                    context: &context,
+                    declarations,
+                };
+                let mut iter = RuleBodyParser::new(input, &mut parser);
+                while let Some(declaration) = iter.next() {
+                    match declaration {
+                        Ok(()) => {
+                            block.extend(iter.parser.declarations.drain(), Importance::Normal);
+                        },
+                        Err((error, slice)) => {
+                            iter.parser.declarations.clear();
+                            let location = error.location;
+                            let error =
+                                ContextualParseError::UnsupportedKeyframePropertyDeclaration(
+                                    slice, error,
+                                );
+                            context.log_css_error(location, error);
+                        },
+                    }
+                    // `parse_important` is not called here, `!important` is not allowed in keyframe blocks.
                 }
-                // `parse_important` is not called here, `!important` is not allowed in keyframe blocks.
-            }
-        });
+            });
         Ok(Arc::new(self.shared_lock.wrap(Keyframe {
             selector,
             block: Arc::new(self.shared_lock.wrap(block)),
@@ -618,9 +623,15 @@ impl<'a, 'b, 'i> QualifiedRuleParser<'i> for KeyframeListParser<'a, 'b> {
     }
 }
 
-impl<'a, 'b, 'i> RuleBodyItemParser<'i, Arc<Locked<Keyframe>>, StyleParseErrorKind<'i>> for KeyframeListParser<'a, 'b> {
-    fn parse_qualified(&self) -> bool { true }
-    fn parse_declarations(&self) -> bool { false }
+impl<'a, 'b, 'i> RuleBodyItemParser<'i, Arc<Locked<Keyframe>>, StyleParseErrorKind<'i>>
+    for KeyframeListParser<'a, 'b>
+{
+    fn parse_qualified(&self) -> bool {
+        true
+    }
+    fn parse_declarations(&self) -> bool {
+        false
+    }
 }
 
 struct KeyframeDeclarationParser<'a, 'b: 'a> {
@@ -668,7 +679,13 @@ impl<'a, 'b, 'i> DeclarationParser<'i> for KeyframeDeclarationParser<'a, 'b> {
     }
 }
 
-impl<'a, 'b, 'i> RuleBodyItemParser<'i, (), StyleParseErrorKind<'i>> for KeyframeDeclarationParser<'a, 'b> {
-    fn parse_qualified(&self) -> bool { false }
-    fn parse_declarations(&self) -> bool { true }
+impl<'a, 'b, 'i> RuleBodyItemParser<'i, (), StyleParseErrorKind<'i>>
+    for KeyframeDeclarationParser<'a, 'b>
+{
+    fn parse_qualified(&self) -> bool {
+        false
+    }
+    fn parse_declarations(&self) -> bool {
+        true
+    }
 }
diff --git a/components/style/stylesheets/loader.rs b/components/style/stylesheets/loader.rs
index 9515e2bc62e..f987cf95972 100644
--- a/components/style/stylesheets/loader.rs
+++ b/components/style/stylesheets/loader.rs
@@ -8,7 +8,7 @@
 use crate::media_queries::MediaList;
 use crate::parser::ParserContext;
 use crate::shared_lock::{Locked, SharedRwLock};
-use crate::stylesheets::import_rule::{ImportLayer, ImportSupportsCondition, ImportRule};
+use crate::stylesheets::import_rule::{ImportLayer, ImportRule, ImportSupportsCondition};
 use crate::values::CssUrl;
 use cssparser::SourceLocation;
 use servo_arc::Arc;
diff --git a/components/style/stylesheets/mod.rs b/components/style/stylesheets/mod.rs
index 7636efb3a61..800ebee12ff 100644
--- a/components/style/stylesheets/mod.rs
+++ b/components/style/stylesheets/mod.rs
@@ -225,10 +225,7 @@ impl fmt::Debug for UrlExtraData {
         formatter
             .debug_struct("URLExtraData")
             .field("chrome_rules_enabled", &self.chrome_rules_enabled())
-            .field(
-                "base",
-                &DebugURI(self.as_ref().mBaseURI.raw()),
-            )
+            .field("base", &DebugURI(self.as_ref().mBaseURI.raw()))
             .field(
                 "referrer",
                 &DebugReferrerInfo(self.as_ref().mReferrerInfo.raw()),
@@ -481,9 +478,7 @@ impl DeepCloneWithLock for CssRule {
         params: &DeepCloneParams,
     ) -> CssRule {
         match *self {
-            CssRule::Namespace(ref arc) => {
-                CssRule::Namespace(arc.clone())
-            },
+            CssRule::Namespace(ref arc) => CssRule::Namespace(arc.clone()),
             CssRule::Import(ref arc) => {
                 let rule = arc
                     .read_with(guard)
@@ -506,19 +501,13 @@ impl DeepCloneWithLock for CssRule {
                 let rule = arc.read_with(guard);
                 CssRule::FontFace(Arc::new(lock.wrap(rule.clone())))
             },
-            CssRule::FontFeatureValues(ref arc) => {
-                CssRule::FontFeatureValues(arc.clone())
-            },
-            CssRule::FontPaletteValues(ref arc) => {
-                CssRule::FontPaletteValues(arc.clone())
-            },
+            CssRule::FontFeatureValues(ref arc) => CssRule::FontFeatureValues(arc.clone()),
+            CssRule::FontPaletteValues(ref arc) => CssRule::FontPaletteValues(arc.clone()),
             CssRule::CounterStyle(ref arc) => {
                 let rule = arc.read_with(guard);
                 CssRule::CounterStyle(Arc::new(lock.wrap(rule.clone())))
             },
-            CssRule::Viewport(ref arc) => {
-                CssRule::Viewport(arc.clone())
-            },
+            CssRule::Viewport(ref arc) => CssRule::Viewport(arc.clone()),
             CssRule::Keyframes(ref arc) => {
                 let rule = arc.read_with(guard);
                 CssRule::Keyframes(Arc::new(
@@ -542,9 +531,7 @@ impl DeepCloneWithLock for CssRule {
             CssRule::Document(ref arc) => {
                 CssRule::Document(Arc::new(arc.deep_clone_with_lock(lock, guard, params)))
             },
-            CssRule::LayerStatement(ref arc) => {
-                CssRule::LayerStatement(arc.clone())
-            },
+            CssRule::LayerStatement(ref arc) => CssRule::LayerStatement(arc.clone()),
             CssRule::LayerBlock(ref arc) => {
                 CssRule::LayerBlock(Arc::new(arc.deep_clone_with_lock(lock, guard, params)))
             },
diff --git a/components/style/stylesheets/rule_parser.rs b/components/style/stylesheets/rule_parser.rs
index 936c92337e2..b601f607e85 100644
--- a/components/style/stylesheets/rule_parser.rs
+++ b/components/style/stylesheets/rule_parser.rs
@@ -147,8 +147,8 @@ impl<'a, 'i> TopLevelRuleParser<'a, 'i> {
         // If there's anything that isn't a namespace rule (or import rule, but
         // we checked that already at the beginning), reject with a
         // StateError.
-        if new_state == State::Namespaces
-            && ctx.rule_list[ctx.index..]
+        if new_state == State::Namespaces &&
+            ctx.rule_list[ctx.index..]
                 .iter()
                 .any(|r| !matches!(*r, CssRule::Namespace(..)))
         {
@@ -356,12 +356,11 @@ impl<'a, 'i> AtRuleParser<'i> for TopLevelRuleParser<'a, 'i> {
                 };
 
                 self.state = State::Namespaces;
-                self.rules
-                    .push(CssRule::Namespace(Arc::new(NamespaceRule {
-                        prefix,
-                        url,
-                        source_location: start.source_location(),
-                    })));
+                self.rules.push(CssRule::Namespace(Arc::new(NamespaceRule {
+                    prefix,
+                    url,
+                    source_location: start.source_location(),
+                })));
             },
             AtRulePrelude::Layer(..) => {
                 AtRuleParser::rule_without_block(&mut self.nested(), prelude, start)?;
@@ -489,7 +488,11 @@ impl<'a, 'b, 'i> NestedRuleParser<'a, 'b, 'i> {
                     Ok(()) => {},
                     Err((error, slice)) => {
                         if parse_declarations {
-                            iter.parser.declaration_parser_state.did_error(iter.parser.context, error, slice);
+                            iter.parser.declaration_parser_state.did_error(
+                                iter.parser.context,
+                                error,
+                                slice,
+                            );
                         } else {
                             let location = error.location;
                             let error = ContextualParseError::InvalidRule(slice, error);
@@ -541,7 +544,7 @@ impl<'a, 'b, 'i> AtRuleParser<'i> for NestedRuleParser<'a, 'b, 'i> {
         input: &mut Parser<'i, 't>,
     ) -> Result<Self::Prelude, ParseError<'i>> {
         if !self.allow_at_and_qualified_rules() {
-            return Err(input.new_error(BasicParseErrorKind::AtRuleInvalid(name)))
+            return Err(input.new_error(BasicParseErrorKind::AtRuleInvalid(name)));
         }
         Ok(match_ignore_ascii_case! { &*name,
             "media" => {
@@ -874,7 +877,8 @@ impl<'a, 'b, 'i> DeclarationParser<'i> for NestedRuleParser<'a, 'b, 'i> {
         name: CowRcStr<'i>,
         input: &mut Parser<'i, 't>,
     ) -> Result<(), ParseError<'i>> {
-        self.declaration_parser_state.parse_value(self.context, name, input)
+        self.declaration_parser_state
+            .parse_value(self.context, name, input)
     }
 }
 
diff --git a/components/style/stylesheets/rules_iterator.rs b/components/style/stylesheets/rules_iterator.rs
index 11eb1fda0c0..950bcd238eb 100644
--- a/components/style/stylesheets/rules_iterator.rs
+++ b/components/style/stylesheets/rules_iterator.rs
@@ -74,7 +74,10 @@ where
             CssRule::FontPaletteValues(_) => None,
             CssRule::Style(ref style_rule) => {
                 let style_rule = style_rule.read_with(guard);
-                style_rule.rules.as_ref().map(|r| r.read_with(guard).0.iter())
+                style_rule
+                    .rules
+                    .as_ref()
+                    .map(|r| r.read_with(guard).0.iter())
             },
             CssRule::Import(ref import_rule) => {
                 let import_rule = import_rule.read_with(guard);
@@ -108,9 +111,7 @@ where
                 }
                 Some(supports_rule.rules.read_with(guard).0.iter())
             },
-            CssRule::LayerBlock(ref layer_rule) => {
-                Some(layer_rule.rules.read_with(guard).0.iter())
-            },
+            CssRule::LayerBlock(ref layer_rule) => Some(layer_rule.rules.read_with(guard).0.iter()),
         }
     }
 }
diff --git a/components/style/stylesheets/style_rule.rs b/components/style/stylesheets/style_rule.rs
index f2dc78b69f8..d5a22d6fc20 100644
--- a/components/style/stylesheets/style_rule.rs
+++ b/components/style/stylesheets/style_rule.rs
@@ -6,9 +6,11 @@
 
 use crate::properties::PropertyDeclarationBlock;
 use crate::selector_parser::SelectorImpl;
-use crate::shared_lock::{DeepCloneParams, DeepCloneWithLock, Locked, SharedRwLock, SharedRwLockReadGuard, ToCssWithGuard};
-use crate::stylesheets::CssRules;
+use crate::shared_lock::{
+    DeepCloneParams, DeepCloneWithLock, Locked, SharedRwLock, SharedRwLockReadGuard, ToCssWithGuard,
+};
 use crate::str::CssStringWriter;
+use crate::stylesheets::CssRules;
 use cssparser::SourceLocation;
 #[cfg(feature = "gecko")]
 use malloc_size_of::MallocUnconditionalShallowSizeOf;
@@ -60,7 +62,8 @@ impl StyleRule {
         n += self.block.unconditional_shallow_size_of(ops) +
             self.block.read_with(guard).size_of(ops);
         if let Some(ref rules) = self.rules {
-            n += rules.unconditional_shallow_size_of(ops) + rules.read_with(guard).size_of(guard, ops)
+            n += rules.unconditional_shallow_size_of(ops) +
+                rules.read_with(guard).size_of(guard, ops)
         }
         n
     }
@@ -87,7 +90,7 @@ impl ToCssWithGuard for StyleRule {
                     dest.write_str("\n  ")?;
                     declaration_block.to_css(dest)?;
                 }
-                return rules.to_css_block_without_opening(guard, dest)
+                return rules.to_css_block_without_opening(guard, dest);
             }
         }
 
diff --git a/components/style/stylesheets/stylesheet.rs b/components/style/stylesheets/stylesheet.rs
index 3994e5cab68..ece2c4a6060 100644
--- a/components/style/stylesheets/stylesheet.rs
+++ b/components/style/stylesheets/stylesheet.rs
@@ -537,7 +537,12 @@ impl Stylesheet {
 
         let source_map_url = input.current_source_map_url().map(String::from);
         let source_url = input.current_source_url().map(String::from);
-        (rule_parser.context.namespaces.into_owned(), rule_parser.rules, source_map_url, source_url)
+        (
+            rule_parser.context.namespaces.into_owned(),
+            rule_parser.rules,
+            source_map_url,
+            source_url,
+        )
     }
 
     /// Creates an empty stylesheet and parses it with a given base url, origin
diff --git a/components/style/stylesheets/supports_rule.rs b/components/style/stylesheets/supports_rule.rs
index ea00fadd2ff..e0afd1f258f 100644
--- a/components/style/stylesheets/supports_rule.rs
+++ b/components/style/stylesheets/supports_rule.rs
@@ -329,9 +329,7 @@ impl ToCss for SupportsCondition {
                 }
                 Ok(())
             },
-            SupportsCondition::Declaration(ref decl) => {
-                decl.to_css(dest)
-            },
+            SupportsCondition::Declaration(ref decl) => decl.to_css(dest),
             SupportsCondition::Selector(ref selector) => {
                 dest.write_str("selector(")?;
                 selector.to_css(dest)?;
diff --git a/components/style/stylesheets/viewport_rule.rs b/components/style/stylesheets/viewport_rule.rs
index 49ed4d463a4..13480fd5621 100644
--- a/components/style/stylesheets/viewport_rule.rs
+++ b/components/style/stylesheets/viewport_rule.rs
@@ -310,9 +310,15 @@ impl<'a, 'b, 'i> DeclarationParser<'i> for ViewportRuleParser<'a, 'b> {
     }
 }
 
-impl<'a, 'b, 'i> RuleBodyItemParser<'i, ViewportDeclarations, StyleParseErrorKind<'i>> for ViewportRuleParser<'a, 'b> {
-    fn parse_declarations(&self) -> bool { true }
-    fn parse_qualified(&self) -> bool { false }
+impl<'a, 'b, 'i> RuleBodyItemParser<'i, ViewportDeclarations, StyleParseErrorKind<'i>>
+    for ViewportRuleParser<'a, 'b>
+{
+    fn parse_declarations(&self) -> bool {
+        true
+    }
+    fn parse_qualified(&self) -> bool {
+        false
+    }
 }
 
 /// A `@viewport` rule.
diff --git a/components/style/stylist.rs b/components/style/stylist.rs
index 48d20ba33e7..92adee56457 100644
--- a/components/style/stylist.rs
+++ b/components/style/stylist.rs
@@ -50,7 +50,9 @@ use selectors::attr::{CaseSensitivity, NamespaceConstraint};
 use selectors::bloom::BloomFilter;
 use selectors::matching::VisitedHandlingMode;
 use selectors::matching::{matches_selector, MatchingContext, MatchingMode, NeedsSelectorFlags};
-use selectors::parser::{AncestorHashes, Combinator, Component, Selector, SelectorList, SelectorIter};
+use selectors::parser::{
+    AncestorHashes, Combinator, Component, Selector, SelectorIter, SelectorList,
+};
 use selectors::visitor::{SelectorListKind, SelectorVisitor};
 use selectors::NthIndexCache;
 use servo_arc::{Arc, ArcBorrow};
@@ -593,7 +595,8 @@ impl<'a> ContainingRuleState<'a> {
     fn restore(&mut self, saved: &SavedContainingRuleState) {
         debug_assert!(self.layer_name.0.len() >= saved.layer_name_len);
         debug_assert!(self.ancestor_selector_lists.len() >= saved.ancestor_selector_lists_len);
-        self.ancestor_selector_lists.truncate(saved.ancestor_selector_lists_len);
+        self.ancestor_selector_lists
+            .truncate(saved.ancestor_selector_lists_len);
         self.layer_name.0.truncate(saved.layer_name_len);
         self.layer_id = saved.layer_id;
         self.container_condition_id = saved.container_condition_id;
@@ -1154,8 +1157,7 @@ impl Stylist {
         );
 
         matching_context.pseudo_element_matching_fn = matching_fn;
-        matching_context.extra_data.originating_element_style =
-            Some(originating_element_style);
+        matching_context.extra_data.originating_element_style = Some(originating_element_style);
 
         self.push_applicable_declarations(
             element,
@@ -1188,8 +1190,7 @@ impl Stylist {
                 needs_selector_flags,
             );
             matching_context.pseudo_element_matching_fn = matching_fn;
-            matching_context.extra_data.originating_element_style =
-                Some(originating_element_style);
+            matching_context.extra_data.originating_element_style = Some(originating_element_style);
 
             self.push_applicable_declarations(
                 element,
@@ -1733,20 +1734,12 @@ impl ExtraStyleData {
     }
 
     /// Add the given @font-feature-values rule.
-    fn add_font_feature_values(
-        &mut self,
-        rule: &Arc<FontFeatureValuesRule>,
-        layer: LayerId,
-    ) {
+    fn add_font_feature_values(&mut self, rule: &Arc<FontFeatureValuesRule>, layer: LayerId) {
         self.font_feature_values.push(rule.clone(), layer);
     }
 
     /// Add the given @font-palette-values rule.
-    fn add_font_palette_values(
-        &mut self,
-        rule: &Arc<FontPaletteValuesRule>,
-        layer: LayerId,
-    ) {
+    fn add_font_palette_values(&mut self, rule: &Arc<FontPaletteValuesRule>, layer: LayerId) {
         self.font_palette_values.push(rule.clone(), layer);
     }
 
@@ -2666,13 +2659,11 @@ impl CascadeData {
                     let has_nested_rules = style_rule.rules.is_some();
                     let ancestor_selectors = containing_rule_state.ancestor_selector_lists.last();
                     if has_nested_rules {
-                        selectors_for_nested_rules = Some(
-                            if ancestor_selectors.is_some() {
-                                Cow::Owned(SelectorList(Default::default()))
-                            } else {
-                                Cow::Borrowed(&style_rule.selectors)
-                            }
-                        );
+                        selectors_for_nested_rules = Some(if ancestor_selectors.is_some() {
+                            Cow::Owned(SelectorList(Default::default()))
+                        } else {
+                            Cow::Borrowed(&style_rule.selectors)
+                        });
                     }
 
                     for selector in &style_rule.selectors.0 {
@@ -2721,12 +2712,15 @@ impl CascadeData {
                             containing_rule_state.container_condition_id,
                         );
 
-                        if let Some(Cow::Owned(ref mut nested_selectors)) = selectors_for_nested_rules {
+                        if let Some(Cow::Owned(ref mut nested_selectors)) =
+                            selectors_for_nested_rules
+                        {
                             nested_selectors.0.push(rule.selector.clone())
                         }
 
                         if rebuild_kind.should_rebuild_invalidation() {
-                            self.invalidation_map.note_selector(&rule.selector, quirks_mode)?;
+                            self.invalidation_map
+                                .note_selector(&rule.selector, quirks_mode)?;
                             let mut needs_revalidation = false;
                             let mut visitor = StylistSelectorVisitor {
                                 needs_revalidation: &mut needs_revalidation,
@@ -2777,17 +2771,19 @@ impl CascadeData {
                             // NOTE(emilio): It's fine to look at :host and then at
                             // ::slotted(..), since :host::slotted(..) could never
                             // possibly match, as <slot> is not a valid shadow host.
-                            let rules =
-                                if rule.selector.is_featureless_host_selector_or_pseudo_element() {
-                                    self.host_rules
-                                        .get_or_insert_with(|| Box::new(Default::default()))
-                                } else if rule.selector.is_slotted() {
-                                    self.slotted_rules
-                                        .get_or_insert_with(|| Box::new(Default::default()))
-                                } else {
-                                    &mut self.normal_rules
-                                }
-                                .for_insertion(pseudo_element);
+                            let rules = if rule
+                                .selector
+                                .is_featureless_host_selector_or_pseudo_element()
+                            {
+                                self.host_rules
+                                    .get_or_insert_with(|| Box::new(Default::default()))
+                            } else if rule.selector.is_slotted() {
+                                self.slotted_rules
+                                    .get_or_insert_with(|| Box::new(Default::default()))
+                            } else {
+                                &mut self.normal_rules
+                            }
+                            .for_insertion(pseudo_element);
                             rules.insert(rule, quirks_mode)?;
                         }
                     }
@@ -2946,14 +2942,19 @@ impl CascadeData {
                             .saw_effective(import_rule);
                     }
                     match import_rule.layer {
-                        ImportLayer::Named(ref name) => maybe_register_layers(self, Some(name), containing_rule_state),
-                        ImportLayer::Anonymous => maybe_register_layers(self, None, containing_rule_state),
+                        ImportLayer::Named(ref name) => {
+                            maybe_register_layers(self, Some(name), containing_rule_state)
+                        },
+                        ImportLayer::Anonymous => {
+                            maybe_register_layers(self, None, containing_rule_state)
+                        },
                         ImportLayer::None => {},
                     }
                 },
                 CssRule::Media(ref media_rule) => {
                     if rebuild_kind.should_rebuild_invalidation() {
-                        self.effective_media_query_results.saw_effective(&**media_rule);
+                        self.effective_media_query_results
+                            .saw_effective(&**media_rule);
                     }
                 },
                 CssRule::LayerBlock(ref rule) => {
@@ -2970,7 +2971,7 @@ impl CascadeData {
                     if let Some(s) = selectors_for_nested_rules {
                         containing_rule_state.ancestor_selector_lists.push(s);
                     }
-                }
+                },
                 CssRule::Container(ref rule) => {
                     let id = ContainerConditionId(self.container_conditions.len() as u16);
                     self.container_conditions.push(ContainerConditionReference {
@@ -3122,8 +3123,9 @@ impl CascadeData {
                 CssRule::Media(ref media_rule) => {
                     let mq = media_rule.media_queries.read_with(guard);
                     let effective_now = mq.evaluate(device, quirks_mode);
-                    let effective_then =
-                        self.effective_media_query_results.was_effective(&**media_rule);
+                    let effective_then = self
+                        .effective_media_query_results
+                        .was_effective(&**media_rule);
 
                     if effective_now != effective_then {
                         debug!(
diff --git a/components/style/values/animated/font.rs b/components/style/values/animated/font.rs
index ef0ce0ec6d0..63d4a14b2fe 100644
--- a/components/style/values/animated/font.rs
+++ b/components/style/values/animated/font.rs
@@ -16,7 +16,8 @@ use crate::values::distance::{ComputeSquaredDistance, SquaredDistance};
 impl Animate for FontVariationSettings {
     #[inline]
     fn animate(&self, other: &Self, procedure: Procedure) -> Result<Self, ()> {
-        let result: Vec<_> = super::lists::by_computed_value::animate(&self.0, &other.0, procedure)?;
+        let result: Vec<_> =
+            super::lists::by_computed_value::animate(&self.0, &other.0, procedure)?;
         Ok(Self(result.into_boxed_slice()))
     }
 }
diff --git a/components/style/values/animated/grid.rs b/components/style/values/animated/grid.rs
index 14e8fc56204..8136ba5ece3 100644
--- a/components/style/values/animated/grid.rs
+++ b/components/style/values/animated/grid.rs
@@ -82,7 +82,11 @@ impl Animate for generics::TrackRepeat<LengthPercentage, Integer> {
         }
 
         let count = self.count;
-        let track_sizes = super::lists::by_computed_value::animate(&self.track_sizes, &other.track_sizes, procedure)?;
+        let track_sizes = super::lists::by_computed_value::animate(
+            &self.track_sizes,
+            &other.track_sizes,
+            procedure,
+        )?;
 
         // The length of |line_names| is always 0 or N+1, where N is the length
         // of |track_sizes|. Besides, <line-names> is always discrete.
@@ -120,7 +124,8 @@ impl Animate for TrackList {
             return Err(());
         }
 
-        let values = super::lists::by_computed_value::animate(&self.values, &other.values, procedure)?;
+        let values =
+            super::lists::by_computed_value::animate(&self.values, &other.values, procedure)?;
 
         // The length of |line_names| is always 0 or N+1, where N is the length
         // of |track_sizes|. Besides, <line-names> is always discrete.
diff --git a/components/style/values/animated/lists.rs b/components/style/values/animated/lists.rs
index 1c688446cc1..8b3898c4971 100644
--- a/components/style/values/animated/lists.rs
+++ b/components/style/values/animated/lists.rs
@@ -8,7 +8,10 @@
 
 /// https://drafts.csswg.org/web-animations-1/#by-computed-value
 pub mod by_computed_value {
-    use crate::values::{animated::{Animate, Procedure}, distance::{ComputeSquaredDistance, SquaredDistance}};
+    use crate::values::{
+        animated::{Animate, Procedure},
+        distance::{ComputeSquaredDistance, SquaredDistance},
+    };
     use std::iter::FromIterator;
 
     #[allow(missing_docs)]
@@ -18,11 +21,12 @@ pub mod by_computed_value {
         C: FromIterator<T>,
     {
         if left.len() != right.len() {
-            return Err(())
+            return Err(());
         }
-        left.iter().zip(right.iter()).map(|(left, right)| {
-            left.animate(right, procedure)
-        }).collect()
+        left.iter()
+            .zip(right.iter())
+            .map(|(left, right)| left.animate(right, procedure))
+            .collect()
     }
 
     #[allow(missing_docs)]
@@ -31,11 +35,12 @@ pub mod by_computed_value {
         T: ComputeSquaredDistance,
     {
         if left.len() != right.len() {
-            return Err(())
+            return Err(());
         }
-        left.iter().zip(right.iter()).map(|(left, right)| {
-            left.compute_squared_distance(right)
-        }).sum()
+        left.iter()
+            .zip(right.iter())
+            .map(|(left, right)| left.compute_squared_distance(right))
+            .sum()
     }
 }
 
@@ -44,8 +49,11 @@ pub mod by_computed_value {
 ///
 /// https://drafts.csswg.org/web-animations-1/#animating-shadow-lists
 pub mod with_zero {
-    use crate::values::{animated::{Animate, Procedure}, distance::{ComputeSquaredDistance, SquaredDistance}};
     use crate::values::animated::ToAnimatedZero;
+    use crate::values::{
+        animated::{Animate, Procedure},
+        distance::{ComputeSquaredDistance, SquaredDistance},
+    };
     use itertools::{EitherOrBoth, Itertools};
     use std::iter::FromIterator;
 
@@ -56,23 +64,16 @@ pub mod with_zero {
         C: FromIterator<T>,
     {
         if procedure == Procedure::Add {
-            return Ok(
-                left.iter().chain(right.iter()).cloned().collect()
-            );
+            return Ok(left.iter().chain(right.iter()).cloned().collect());
         }
-        left.iter().zip_longest(right.iter()).map(|it| {
-            match it {
-                EitherOrBoth::Both(left, right) => {
-                    left.animate(right, procedure)
-                },
-                EitherOrBoth::Left(left) => {
-                    left.animate(&left.to_animated_zero()?, procedure)
-                },
-                EitherOrBoth::Right(right) => {
-                    right.to_animated_zero()?.animate(right, procedure)
-                }
-            }
-        }).collect()
+        left.iter()
+            .zip_longest(right.iter())
+            .map(|it| match it {
+                EitherOrBoth::Both(left, right) => left.animate(right, procedure),
+                EitherOrBoth::Left(left) => left.animate(&left.to_animated_zero()?, procedure),
+                EitherOrBoth::Right(right) => right.to_animated_zero()?.animate(right, procedure),
+            })
+            .collect()
     }
 
     #[allow(missing_docs)]
@@ -80,22 +81,24 @@ pub mod with_zero {
     where
         T: ToAnimatedZero + ComputeSquaredDistance,
     {
-        left.iter().zip_longest(right.iter()).map(|it| {
-            match it {
-                EitherOrBoth::Both(left, right) => {
-                    left.compute_squared_distance(right)
-                },
+        left.iter()
+            .zip_longest(right.iter())
+            .map(|it| match it {
+                EitherOrBoth::Both(left, right) => left.compute_squared_distance(right),
                 EitherOrBoth::Left(item) | EitherOrBoth::Right(item) => {
                     item.to_animated_zero()?.compute_squared_distance(item)
                 },
-            }
-        }).sum()
+            })
+            .sum()
     }
 }
 
 /// https://drafts.csswg.org/web-animations-1/#repeatable-list
-pub mod repeatable_list  {
-    use crate::values::{animated::{Animate, Procedure}, distance::{ComputeSquaredDistance, SquaredDistance}};
+pub mod repeatable_list {
+    use crate::values::{
+        animated::{Animate, Procedure},
+        distance::{ComputeSquaredDistance, SquaredDistance},
+    };
     use std::iter::FromIterator;
 
     #[allow(missing_docs)]
@@ -110,9 +113,12 @@ pub mod repeatable_list  {
             return Err(());
         }
         let len = lcm(left.len(), right.len());
-        left.iter().cycle().zip(right.iter().cycle()).take(len).map(|(left, right)| {
-            left.animate(right, procedure)
-        }).collect()
+        left.iter()
+            .cycle()
+            .zip(right.iter().cycle())
+            .take(len)
+            .map(|(left, right)| left.animate(right, procedure))
+            .collect()
     }
 
     #[allow(missing_docs)]
@@ -125,8 +131,11 @@ pub mod repeatable_list  {
             return Err(());
         }
         let len = lcm(left.len(), right.len());
-        left.iter().cycle().zip(right.iter().cycle()).take(len).map(|(left, right)| {
-            left.compute_squared_distance(right)
-        }).sum()
+        left.iter()
+            .cycle()
+            .zip(right.iter().cycle())
+            .take(len)
+            .map(|(left, right)| left.compute_squared_distance(right))
+            .sum()
     }
 }
diff --git a/components/style/values/animated/mod.rs b/components/style/values/animated/mod.rs
index e8284272fbb..04a05a81ac4 100644
--- a/components/style/values/animated/mod.rs
+++ b/components/style/values/animated/mod.rs
@@ -22,9 +22,9 @@ use std::cmp;
 
 pub mod color;
 pub mod effects;
-pub mod lists;
 mod font;
 mod grid;
+pub mod lists;
 mod svg;
 pub mod transform;
 
diff --git a/components/style/values/animated/svg.rs b/components/style/values/animated/svg.rs
index 85f24816481..04e35098adb 100644
--- a/components/style/values/animated/svg.rs
+++ b/components/style/values/animated/svg.rs
@@ -20,9 +20,11 @@ where
             return Err(());
         }
         match (self, other) {
-            (&SVGStrokeDashArray::Values(ref this), &SVGStrokeDashArray::Values(ref other)) => Ok(
-                SVGStrokeDashArray::Values(super::lists::repeatable_list::animate(this, other, procedure)?),
-            ),
+            (&SVGStrokeDashArray::Values(ref this), &SVGStrokeDashArray::Values(ref other)) => {
+                Ok(SVGStrokeDashArray::Values(
+                    super::lists::repeatable_list::animate(this, other, procedure)?,
+                ))
+            },
             _ => Err(()),
         }
     }
diff --git a/components/style/values/computed/font.rs b/components/style/values/computed/font.rs
index 4f51f8a99ff..70c47752140 100644
--- a/components/style/values/computed/font.rs
+++ b/components/style/values/computed/font.rs
@@ -26,8 +26,8 @@ use std::fmt::{self, Write};
 use style_traits::{CssWriter, ParseError, ToCss};
 
 pub use crate::values::computed::Length as MozScriptMinSize;
-pub use crate::values::specified::font::{FontPalette, FontSynthesis};
 pub use crate::values::specified::font::MozScriptSizeMultiplier;
+pub use crate::values::specified::font::{FontPalette, FontSynthesis};
 pub use crate::values::specified::font::{
     FontVariantAlternates, FontVariantEastAsian, FontVariantLigatures, FontVariantNumeric, XLang,
     XTextScale,
@@ -869,7 +869,7 @@ where
     SpecifiedValueInfo,
     ToComputedValue,
     ToResolvedValue,
-    ToShmem
+    ToShmem,
 )]
 #[repr(C)]
 #[value_info(other_values = "normal")]
diff --git a/components/style/values/computed/length.rs b/components/style/values/computed/length.rs
index eb30dbcc13f..64285e7c124 100644
--- a/components/style/values/computed/length.rs
+++ b/components/style/values/computed/length.rs
@@ -48,18 +48,11 @@ impl specified::NoCalcLength {
     ) -> Length {
         match *self {
             Self::Absolute(length) => length.to_computed_value(context),
-            Self::FontRelative(length) => {
-                length.to_computed_value(context, base_size)
-            },
-            Self::ViewportPercentage(length) => {
-                length.to_computed_value(context)
-            },
-            Self::ContainerRelative(length) => {
-                length.to_computed_value(context)
-            },
-            Self::ServoCharacterWidth(length) => {
-                length.to_computed_value(context.style().get_font().clone_font_size().computed_size())
-            },
+            Self::FontRelative(length) => length.to_computed_value(context, base_size),
+            Self::ViewportPercentage(length) => length.to_computed_value(context),
+            Self::ContainerRelative(length) => length.to_computed_value(context),
+            Self::ServoCharacterWidth(length) => length
+                .to_computed_value(context.style().get_font().clone_font_size().computed_size()),
         }
     }
 }
@@ -71,9 +64,7 @@ impl ToComputedValue for specified::Length {
     fn to_computed_value(&self, context: &Context) -> Self::ComputedValue {
         match *self {
             Self::NoCalc(l) => l.to_computed_value(context),
-            Self::Calc(ref calc) => {
-                calc.to_computed_value(context).to_length().unwrap()
-            },
+            Self::Calc(ref calc) => calc.to_computed_value(context).to_length().unwrap(),
         }
     }
 
@@ -92,9 +83,7 @@ macro_rules! computed_length_percentage_or_auto {
         pub fn to_used_value(&self, percentage_basis: Au) -> Option<Au> {
             match *self {
                 Self::Auto => None,
-                Self::LengthPercentage(ref lp) => {
-                    Some(lp.to_used_value(percentage_basis))
-                },
+                Self::LengthPercentage(ref lp) => Some(lp.to_used_value(percentage_basis)),
             }
         }
 
diff --git a/components/style/values/computed/mod.rs b/components/style/values/computed/mod.rs
index c10ab1160eb..92d9cd9503b 100644
--- a/components/style/values/computed/mod.rs
+++ b/components/style/values/computed/mod.rs
@@ -42,6 +42,8 @@ pub use self::align::{
 #[cfg(feature = "gecko")]
 pub use self::align::{AlignSelf, JustifySelf};
 pub use self::angle::Angle;
+pub use self::animation::{AnimationIterationCount, AnimationName, AnimationTimeline};
+pub use self::animation::{ScrollAxis, ScrollTimelineName, TransitionProperty, ViewTimelineInset};
 pub use self::background::{BackgroundRepeat, BackgroundSize};
 pub use self::basic_shape::FillRule;
 pub use self::border::{BorderCornerRadius, BorderRadius, BorderSpacing};
@@ -50,6 +52,7 @@ pub use self::border::{BorderImageSlice, BorderImageWidth};
 pub use self::box_::{
     Appearance, BreakBetween, BreakWithin, Clear, ContainIntrinsicSize, ContentVisibility, Float,
 };
+pub use self::box_::{BaselineSource, TouchAction, VerticalAlign, WillChange};
 pub use self::box_::{
     Contain, ContainerName, ContainerType, Display, LineClamp, Overflow, OverflowAnchor,
 };
@@ -57,7 +60,6 @@ pub use self::box_::{OverflowClipBox, OverscrollBehavior, Perspective, Resize, S
 pub use self::box_::{
     ScrollSnapAlign, ScrollSnapAxis, ScrollSnapStop, ScrollSnapStrictness, ScrollSnapType,
 };
-pub use self::box_::{BaselineSource, TouchAction, VerticalAlign, WillChange};
 pub use self::color::{
     Color, ColorOrAuto, ColorPropertyValue, ColorScheme, ForcedColorAdjust, PrintColorAdjust,
 };
@@ -106,8 +108,6 @@ pub use self::transform::{TransformOrigin, TransformStyle, Translate};
 #[cfg(feature = "gecko")]
 pub use self::ui::CursorImage;
 pub use self::ui::{BoolInteger, Cursor, UserSelect};
-pub use self::animation::{AnimationIterationCount, AnimationName, AnimationTimeline};
-pub use self::animation::{ScrollAxis, ScrollTimelineName, TransitionProperty, ViewTimelineInset};
 pub use super::specified::TextTransform;
 pub use super::specified::ViewportVariant;
 pub use super::specified::{BorderStyle, TextDecorationLine};
@@ -390,7 +390,12 @@ impl<'a> Context<'a> {
     /// Apply text-zoom if enabled.
     #[cfg(feature = "gecko")]
     pub fn maybe_zoom_text(&self, size: CSSPixelLength) -> CSSPixelLength {
-        if self.style().get_font().clone__x_text_scale().text_zoom_enabled() {
+        if self
+            .style()
+            .get_font()
+            .clone__x_text_scale()
+            .text_zoom_enabled()
+        {
             self.device().zoom_text(size)
         } else {
             size
diff --git a/components/style/values/computed/text.rs b/components/style/values/computed/text.rs
index 951626d536c..3c9d13031f2 100644
--- a/components/style/values/computed/text.rs
+++ b/components/style/values/computed/text.rs
@@ -125,7 +125,12 @@ impl ToResolvedValue for LineHeight {
             }
             let wm = context.style.writing_mode;
             let vertical = wm.is_vertical() && !wm.is_sideways();
-            return Self::Length(context.device.calc_line_height(&self, vertical, context.style.get_font(), Some(context.element_info.element)));
+            return Self::Length(context.device.calc_line_height(
+                &self,
+                vertical,
+                context.style.get_font(),
+                Some(context.element_info.element),
+            ));
         }
         if let LineHeight::Number(num) = &self {
             let size = context.style.get_font().clone_font_size().computed_size();
diff --git a/components/style/values/generics/basic_shape.rs b/components/style/values/generics/basic_shape.rs
index 870b6c82b5b..00d682a169f 100644
--- a/components/style/values/generics/basic_shape.rs
+++ b/components/style/values/generics/basic_shape.rs
@@ -5,7 +5,7 @@
 //! CSS handling for the [`basic-shape`](https://drafts.csswg.org/css-shapes/#typedef-basic-shape)
 //! types that are generic over their `ToCss` implementations.
 
-use crate::values::animated::{Animate, Procedure, ToAnimatedZero, lists};
+use crate::values::animated::{lists, Animate, Procedure, ToAnimatedZero};
 use crate::values::distance::{ComputeSquaredDistance, SquaredDistance};
 use crate::values::generics::border::GenericBorderRadius;
 use crate::values::generics::position::GenericPosition;
@@ -479,7 +479,8 @@ where
         if self.fill != other.fill {
             return Err(());
         }
-        let coordinates = lists::by_computed_value::animate(&self.coordinates, &other.coordinates, procedure)?;
+        let coordinates =
+            lists::by_computed_value::animate(&self.coordinates, &other.coordinates, procedure)?;
         Ok(Polygon {
             fill: self.fill,
             coordinates,
diff --git a/components/style/values/generics/counters.rs b/components/style/values/generics/counters.rs
index c342e035fc9..3f23c74b334 100644
--- a/components/style/values/generics/counters.rs
+++ b/components/style/values/generics/counters.rs
@@ -237,7 +237,16 @@ impl<Image> Content<Image> {
 
 /// Items for the `content` property.
 #[derive(
-    Clone, Debug, Eq, MallocSizeOf, PartialEq, ToComputedValue, SpecifiedValueInfo, ToCss, ToResolvedValue, ToShmem,
+    Clone,
+    Debug,
+    Eq,
+    MallocSizeOf,
+    PartialEq,
+    ToComputedValue,
+    SpecifiedValueInfo,
+    ToCss,
+    ToResolvedValue,
+    ToShmem,
 )]
 #[repr(u8)]
 pub enum GenericContentItem<I> {
diff --git a/components/style/values/generics/grid.rs b/components/style/values/generics/grid.rs
index b01ef388707..e35c96a28ca 100644
--- a/components/style/values/generics/grid.rs
+++ b/components/style/values/generics/grid.rs
@@ -699,10 +699,8 @@ impl Parse for LineNameList {
                     // FIXME(emilio): we shouldn't expand repeat() at
                     // parse time for subgrid. (bug 1583429)
                     RepeatCount::Number(num) => {
-                        let n = handle_size(
-                            num.value() as usize * names_list.len());
-                        line_names.extend(
-                            names_list.iter().cloned().cycle().take(n));
+                        let n = handle_size(num.value() as usize * names_list.len());
+                        line_names.extend(names_list.iter().cloned().cycle().take(n));
                     },
                     RepeatCount::AutoFill if fill_data.is_none() => {
                         let fill_idx = line_names.len();
diff --git a/components/style/values/generics/page.rs b/components/style/values/generics/page.rs
index 5c96a788f44..91f02bc4b37 100644
--- a/components/style/values/generics/page.rs
+++ b/components/style/values/generics/page.rs
@@ -74,7 +74,18 @@ impl PaperSize {
 ///
 /// https://drafts.csswg.org/css-page-3/#page-orientation-prop
 #[derive(
-    Clone, Copy, Debug, Eq, MallocSizeOf, Parse, PartialEq, SpecifiedValueInfo, ToComputedValue, ToCss, ToResolvedValue, ToShmem,
+    Clone,
+    Copy,
+    Debug,
+    Eq,
+    MallocSizeOf,
+    Parse,
+    PartialEq,
+    SpecifiedValueInfo,
+    ToComputedValue,
+    ToCss,
+    ToResolvedValue,
+    ToShmem,
 )]
 #[repr(u8)]
 pub enum PageOrientation {
@@ -128,7 +139,10 @@ pub enum GenericPageSize<S> {
     /// An orientation with no size.
     Orientation(PageSizeOrientation),
     /// Paper size by name
-    PaperSize(PaperSize, #[css(skip_if = "is_portrait")] PageSizeOrientation),
+    PaperSize(
+        PaperSize,
+        #[css(skip_if = "is_portrait")] PageSizeOrientation,
+    ),
 }
 
 pub use self::GenericPageSize as PageSize;
diff --git a/components/style/values/mod.rs b/components/style/values/mod.rs
index ce0d9fc42f3..173312cb0b5 100644
--- a/components/style/values/mod.rs
+++ b/components/style/values/mod.rs
@@ -100,7 +100,12 @@ fn nan_inf_enabled() -> bool {
 }
 
 /// Serialize a specified dimension with unit, calc, and NaN/infinity handling (if enabled)
-pub fn serialize_specified_dimension<W>(v: f32, unit: &str, was_calc: bool, dest: &mut CssWriter<W>) -> fmt::Result
+pub fn serialize_specified_dimension<W>(
+    v: f32,
+    unit: &str,
+    was_calc: bool,
+    dest: &mut CssWriter<W>,
+) -> fmt::Result
 where
     W: Write,
 {
@@ -567,7 +572,10 @@ impl ToCss for CustomIdent {
 pub struct DashedIdent(pub Atom);
 
 impl Parse for DashedIdent {
-    fn parse<'i, 't>(_: &ParserContext, input: &mut Parser<'i, 't>) -> Result<Self, ParseError<'i>> {
+    fn parse<'i, 't>(
+        _: &ParserContext,
+        input: &mut Parser<'i, 't>,
+    ) -> Result<Self, ParseError<'i>> {
         let location = input.current_source_location();
         let ident = input.expect_ident()?;
         if ident.starts_with("--") {
diff --git a/components/style/values/specified/angle.rs b/components/style/values/specified/angle.rs
index 54b690c80c7..fb4554eb852 100644
--- a/components/style/values/specified/angle.rs
+++ b/components/style/values/specified/angle.rs
@@ -73,7 +73,7 @@ impl AngleDimension {
             AngleDimension::Deg(_) => "deg",
             AngleDimension::Rad(_) => "rad",
             AngleDimension::Turn(_) => "turn",
-            AngleDimension::Grad(_) => "grad"
+            AngleDimension::Grad(_) => "grad",
         }
     }
 }
@@ -105,7 +105,12 @@ impl ToCss for Angle {
     where
         W: Write,
     {
-        crate::values::serialize_specified_dimension(self.value.unitless_value(), self.value.unit(), self.was_calc, dest)
+        crate::values::serialize_specified_dimension(
+            self.value.unitless_value(),
+            self.value.unit(),
+            self.was_calc,
+            dest,
+        )
     }
 }
 
@@ -117,11 +122,7 @@ impl ToComputedValue for Angle {
         let degrees = self.degrees();
 
         // NaN and +-infinity should degenerate to 0: https://github.com/w3c/csswg-drafts/issues/6105
-        ComputedAngle::from_degrees(if degrees.is_finite() {
-            degrees
-        } else {
-            0.0
-        })
+        ComputedAngle::from_degrees(if degrees.is_finite() { degrees } else { 0.0 })
     }
 
     #[inline]
diff --git a/components/style/values/specified/font.rs b/components/style/values/specified/font.rs
index 68401da02b4..6443548a443 100644
--- a/components/style/values/specified/font.rs
+++ b/components/style/values/specified/font.rs
@@ -19,7 +19,7 @@ use crate::values::generics::NonNegative;
 use crate::values::specified::length::{FontBaseSize, PX_PER_PT};
 use crate::values::specified::{AllowQuirks, Angle, Integer, LengthPercentage};
 use crate::values::specified::{NoCalcLength, NonNegativeNumber, NonNegativePercentage, Number};
-use crate::values::{CustomIdent, SelectorParseErrorKind, serialize_atom_identifier};
+use crate::values::{serialize_atom_identifier, CustomIdent, SelectorParseErrorKind};
 use crate::Atom;
 use cssparser::{Parser, Token};
 #[cfg(feature = "gecko")]
@@ -1034,7 +1034,15 @@ bitflags! {
 }
 
 #[derive(
-    Clone, Debug, MallocSizeOf, PartialEq, SpecifiedValueInfo, ToCss, ToComputedValue, ToResolvedValue, ToShmem,
+    Clone,
+    Debug,
+    MallocSizeOf,
+    PartialEq,
+    SpecifiedValueInfo,
+    ToCss,
+    ToComputedValue,
+    ToResolvedValue,
+    ToShmem,
 )]
 #[repr(C, u8)]
 /// Set of variant alternates
@@ -1817,9 +1825,15 @@ pub struct FontPalette(Atom);
 
 #[allow(missing_docs)]
 impl FontPalette {
-    pub fn normal() -> Self { Self(atom!("normal")) }
-    pub fn light() -> Self { Self(atom!("light")) }
-    pub fn dark() -> Self { Self(atom!("dark")) }
+    pub fn normal() -> Self {
+        Self(atom!("normal"))
+    }
+    pub fn light() -> Self {
+        Self(atom!("light"))
+    }
+    pub fn dark() -> Self {
+        Self(atom!("dark"))
+    }
 }
 
 impl Parse for FontPalette {
diff --git a/components/style/values/specified/image.rs b/components/style/values/specified/image.rs
index e614d279d30..af2ec979869 100644
--- a/components/style/values/specified/image.rs
+++ b/components/style/values/specified/image.rs
@@ -190,12 +190,7 @@ impl Parse for Image {
         context: &ParserContext,
         input: &mut Parser<'i, 't>,
     ) -> Result<Image, ParseError<'i>> {
-        Image::parse_with_cors_mode(
-            context,
-            input,
-            CorsMode::None,
-            ParseImageFlags::empty()
-        )
+        Image::parse_with_cors_mode(context, input, CorsMode::None, ParseImageFlags::empty())
     }
 }
 
@@ -204,9 +199,11 @@ impl Image {
         context: &ParserContext,
         input: &mut Parser<'i, 't>,
         cors_mode: CorsMode,
-        flags: ParseImageFlags
+        flags: ParseImageFlags,
     ) -> Result<Image, ParseError<'i>> {
-        if !flags.contains(ParseImageFlags::FORBID_NONE) && input.try_parse(|i| i.expect_ident_matching("none")).is_ok() {
+        if !flags.contains(ParseImageFlags::FORBID_NONE) &&
+            input.try_parse(|i| i.expect_ident_matching("none")).is_ok()
+        {
             return Ok(generic::Image::None);
         }
 
@@ -233,7 +230,9 @@ impl Image {
         }
 
         if cross_fade_enabled() {
-            if let Ok(cf) = input.try_parse(|input| CrossFade::parse(context, input, cors_mode, flags)) {
+            if let Ok(cf) =
+                input.try_parse(|input| CrossFade::parse(context, input, cors_mode, flags))
+            {
                 return Ok(generic::Image::CrossFade(Box::new(cf)));
             }
         }
@@ -287,7 +286,7 @@ impl Image {
             context,
             input,
             CorsMode::Anonymous,
-            ParseImageFlags::empty()
+            ParseImageFlags::empty(),
         )
     }
 
@@ -296,12 +295,7 @@ impl Image {
         context: &ParserContext,
         input: &mut Parser<'i, 't>,
     ) -> Result<Image, ParseError<'i>> {
-        Self::parse_with_cors_mode(
-            context,
-            input,
-            CorsMode::None,
-            ParseImageFlags::FORBID_NONE
-        )
+        Self::parse_with_cors_mode(context, input, CorsMode::None, ParseImageFlags::FORBID_NONE)
     }
 
     /// Provides an alternate method for parsing, but only for urls.
@@ -313,7 +307,7 @@ impl Image {
             context,
             input,
             CorsMode::None,
-            ParseImageFlags::FORBID_NONE | ParseImageFlags::FORBID_NON_URL
+            ParseImageFlags::FORBID_NONE | ParseImageFlags::FORBID_NON_URL,
         )
     }
 }
@@ -324,11 +318,13 @@ impl CrossFade {
         context: &ParserContext,
         input: &mut Parser<'i, 't>,
         cors_mode: CorsMode,
-        flags: ParseImageFlags
+        flags: ParseImageFlags,
     ) -> Result<Self, ParseError<'i>> {
         input.expect_function_matching("cross-fade")?;
         let elements = input.parse_nested_block(|input| {
-            input.parse_comma_separated(|input| CrossFadeElement::parse(context, input, cors_mode, flags))
+            input.parse_comma_separated(|input| {
+                CrossFadeElement::parse(context, input, cors_mode, flags)
+            })
         })?;
         let elements = crate::OwnedSlice::from(elements);
         Ok(Self { elements })
@@ -355,7 +351,7 @@ impl CrossFadeElement {
         context: &ParserContext,
         input: &mut Parser<'i, 't>,
         cors_mode: CorsMode,
-        flags: ParseImageFlags
+        flags: ParseImageFlags,
     ) -> Result<Self, ParseError<'i>> {
         // Try and parse a leading percent sign.
         let mut percent = Self::parse_percentage(context, input);
@@ -377,12 +373,14 @@ impl CrossFadeImage {
         context: &ParserContext,
         input: &mut Parser<'i, 't>,
         cors_mode: CorsMode,
-        flags: ParseImageFlags
+        flags: ParseImageFlags,
     ) -> Result<Self, ParseError<'i>> {
         if let Ok(image) = input.try_parse(|input| {
             Image::parse_with_cors_mode(
-                context, input, cors_mode,
-                flags | ParseImageFlags::FORBID_NONE
+                context,
+                input,
+                cors_mode,
+                flags | ParseImageFlags::FORBID_NONE,
             )
         }) {
             return Ok(Self::Image(image));
@@ -396,7 +394,7 @@ impl ImageSet {
         context: &ParserContext,
         input: &mut Parser<'i, 't>,
         cors_mode: CorsMode,
-        flags: ParseImageFlags
+        flags: ParseImageFlags,
     ) -> Result<Self, ParseError<'i>> {
         let function = input.expect_function()?;
         match_ignore_ascii_case! { &function,
@@ -428,7 +426,7 @@ impl ImageSetItem {
         context: &ParserContext,
         input: &mut Parser<'i, 't>,
         cors_mode: CorsMode,
-        flags: ParseImageFlags
+        flags: ParseImageFlags,
     ) -> Result<Self, ParseError<'i>> {
         let image = match input.try_parse(|i| i.expect_url_or_string()) {
             Ok(url) => Image::Url(SpecifiedImageUrl::parse_from_string(
@@ -437,8 +435,10 @@ impl ImageSetItem {
                 cors_mode,
             )),
             Err(..) => Image::parse_with_cors_mode(
-                context, input, cors_mode,
-                flags | ParseImageFlags::FORBID_NONE | ParseImageFlags::FORBID_IMAGE_SET
+                context,
+                input,
+                cors_mode,
+                flags | ParseImageFlags::FORBID_NONE | ParseImageFlags::FORBID_IMAGE_SET,
             )?,
         };
 
diff --git a/components/style/values/specified/length.rs b/components/style/values/specified/length.rs
index 0ad727d7486..06001b294ef 100644
--- a/components/style/values/specified/length.rs
+++ b/components/style/values/specified/length.rs
@@ -22,9 +22,9 @@ use crate::{Zero, ZeroNoPercent};
 use app_units::Au;
 use cssparser::{Parser, Token};
 use std::cmp;
-use style_traits::values::specified::AllowedNumericType;
 use std::fmt::{self, Write};
-use style_traits::{ParseError, SpecifiedValueInfo, StyleParseErrorKind, CssWriter, ToCss};
+use style_traits::values::specified::AllowedNumericType;
+use style_traits::{CssWriter, ParseError, SpecifiedValueInfo, StyleParseErrorKind, ToCss};
 
 pub use super::image::Image;
 pub use super::image::{EndingShape as GradientEndingShape, Gradient};
@@ -89,12 +89,9 @@ impl FontRelativeLength {
     /// Return the unitless, raw value.
     fn unitless_value(&self) -> CSSFloat {
         match *self {
-            Self::Em(v) |
-            Self::Ex(v) |
-            Self::Ch(v) |
-            Self::Cap(v) |
-            Self::Ic(v) |
-            Self::Rem(v) => v,
+            Self::Em(v) | Self::Ex(v) | Self::Ch(v) | Self::Cap(v) | Self::Ic(v) | Self::Rem(v) => {
+                v
+            },
         }
     }
 
@@ -574,7 +571,12 @@ impl ViewportPercentageLength {
         // See bug 989802. We truncate so that adding multiple viewport units
         // that add up to 100 does not overflow due to rounding differences
         let trunc_scaled = ((length.0 as f64) * factor as f64 / 100.).trunc();
-        Au::from_f64_au(if trunc_scaled.is_nan() { 0.0f64 } else { trunc_scaled }).into()
+        Au::from_f64_au(if trunc_scaled.is_nan() {
+            0.0f64
+        } else {
+            trunc_scaled
+        })
+        .into()
     }
 }
 
@@ -901,11 +903,8 @@ impl NoCalcLength {
     /// because the font they're relative to should be zoomed already.
     pub fn should_zoom_text(&self) -> bool {
         match *self {
-            Self::Absolute(..) |
-            Self::ViewportPercentage(..) |
-            Self::ContainerRelative(..) => true,
-            Self::ServoCharacterWidth(..) |
-            Self::FontRelative(..) => false,
+            Self::Absolute(..) | Self::ViewportPercentage(..) | Self::ContainerRelative(..) => true,
+            Self::ServoCharacterWidth(..) | Self::FontRelative(..) => false,
         }
     }
 
@@ -1101,7 +1100,12 @@ impl ToCss for NoCalcLength {
     where
         W: Write,
     {
-        crate::values::serialize_specified_dimension(self.unitless_value(), self.unit(), false, dest)
+        crate::values::serialize_specified_dimension(
+            self.unitless_value(),
+            self.unit(),
+            false,
+            dest,
+        )
     }
 }
 
diff --git a/components/style/values/specified/mod.rs b/components/style/values/specified/mod.rs
index 8d862885461..d3a4373fd09 100644
--- a/components/style/values/specified/mod.rs
+++ b/components/style/values/specified/mod.rs
@@ -30,12 +30,15 @@ pub use self::align::{AlignContent, AlignItems, AlignSelf, AlignTracks, ContentD
 #[cfg(feature = "gecko")]
 pub use self::align::{JustifyContent, JustifyItems, JustifySelf, JustifyTracks, SelfAlignment};
 pub use self::angle::{AllowUnitlessZeroAngle, Angle};
+pub use self::animation::{AnimationIterationCount, AnimationName, AnimationTimeline};
+pub use self::animation::{ScrollAxis, ScrollTimelineName, TransitionProperty, ViewTimelineInset};
 pub use self::background::{BackgroundRepeat, BackgroundSize};
 pub use self::basic_shape::FillRule;
 pub use self::border::{BorderCornerRadius, BorderImageSlice, BorderImageWidth};
 pub use self::border::{BorderImageRepeat, BorderImageSideWidth};
 pub use self::border::{BorderRadius, BorderSideWidth, BorderSpacing, BorderStyle};
 pub use self::box_::{Appearance, BreakBetween, BreakWithin, ContainerName, ContainerType};
+pub use self::box_::{BaselineSource, TouchAction, VerticalAlign, WillChange};
 pub use self::box_::{
     Clear, ContainIntrinsicSize, ContentVisibility, Float, LineClamp, Overflow, OverflowAnchor,
 };
@@ -43,7 +46,6 @@ pub use self::box_::{Contain, Display};
 pub use self::box_::{OverflowClipBox, OverscrollBehavior, Perspective, Resize, ScrollbarGutter};
 pub use self::box_::{ScrollSnapAlign, ScrollSnapAxis, ScrollSnapStop};
 pub use self::box_::{ScrollSnapStrictness, ScrollSnapType};
-pub use self::box_::{BaselineSource, TouchAction, VerticalAlign, WillChange};
 pub use self::color::{
     Color, ColorOrAuto, ColorPropertyValue, ColorScheme, ForcedColorAdjust, PrintColorAdjust,
 };
@@ -100,8 +102,6 @@ pub use self::transform::{TransformOrigin, TransformStyle, Translate};
 #[cfg(feature = "gecko")]
 pub use self::ui::CursorImage;
 pub use self::ui::{BoolInteger, Cursor, UserSelect};
-pub use self::animation::{AnimationIterationCount, AnimationName, AnimationTimeline};
-pub use self::animation::{ScrollAxis, ScrollTimelineName, TransitionProperty, ViewTimelineInset};
 pub use super::generics::grid::GridTemplateComponent as GenericGridTemplateComponent;
 
 #[cfg(feature = "gecko")]
diff --git a/components/style/values/specified/percentage.rs b/components/style/values/specified/percentage.rs
index c44a2781a8a..ccf16d64639 100644
--- a/components/style/values/specified/percentage.rs
+++ b/components/style/values/specified/percentage.rs
@@ -10,7 +10,7 @@ use crate::values::computed::{Context, ToComputedValue};
 use crate::values::generics::NonNegative;
 use crate::values::specified::calc::CalcNode;
 use crate::values::specified::Number;
-use crate::values::{serialize_percentage, normalize, CSSFloat};
+use crate::values::{normalize, serialize_percentage, CSSFloat};
 use cssparser::{Parser, Token};
 use std::fmt::{self, Write};
 use style_traits::values::specified::AllowedNumericType;
diff --git a/components/style/values/specified/source_size_list.rs b/components/style/values/specified/source_size_list.rs
index 7fa92fe581a..ac47461cc48 100644
--- a/components/style/values/specified/source_size_list.rs
+++ b/components/style/values/specified/source_size_list.rs
@@ -55,10 +55,12 @@ impl SourceSizeList {
     /// Evaluate this <source-size-list> to get the final viewport length.
     pub fn evaluate(&self, device: &Device, quirks_mode: QuirksMode) -> Au {
         computed::Context::for_media_query_evaluation(device, quirks_mode, |context| {
-            let matching_source_size = self
-                .source_sizes
-                .iter()
-                .find(|source_size| source_size.condition.matches(context).to_bool(/* unknown = */ false));
+            let matching_source_size = self.source_sizes.iter().find(|source_size| {
+                source_size
+                    .condition
+                    .matches(context)
+                    .to_bool(/* unknown = */ false)
+            });
 
             match matching_source_size {
                 Some(source_size) => source_size.value.to_computed_value(context),
diff --git a/components/style/values/specified/svg_path.rs b/components/style/values/specified/svg_path.rs
index 844294f2482..3b33a188fec 100644
--- a/components/style/values/specified/svg_path.rs
+++ b/components/style/values/specified/svg_path.rs
@@ -995,9 +995,7 @@ fn parse_number(iter: &mut Peekable<Cloned<slice::Iter<u8>>>) -> Result<CSSFloat
     }
 
     if value.is_finite() {
-        Ok(value
-            .min(f32::MAX as f64)
-            .max(f32::MIN as f64) as CSSFloat)
+        Ok(value.min(f32::MAX as f64).max(f32::MIN as f64) as CSSFloat)
     } else {
         Err(())
     }
diff --git a/components/style/values/specified/time.rs b/components/style/values/specified/time.rs
index 3fbba214f36..e8410c7f43d 100644
--- a/components/style/values/specified/time.rs
+++ b/components/style/values/specified/time.rs
@@ -33,7 +33,10 @@ pub enum TimeUnit {
 
 impl Time {
     /// Returns a time value that represents `seconds` seconds.
-    pub fn from_seconds_with_calc_clamping_mode(seconds: CSSFloat, calc_clamping_mode: Option<AllowedNumericType>) -> Self {
+    pub fn from_seconds_with_calc_clamping_mode(
+        seconds: CSSFloat,
+        calc_clamping_mode: Option<AllowedNumericType>,
+    ) -> Self {
         Time {
             seconds,
             unit: TimeUnit::Second,
@@ -61,7 +64,7 @@ impl Time {
     pub fn unit(&self) -> &'static str {
         match self.unit {
             TimeUnit::Second => "s",
-            TimeUnit::Millisecond => "ms"
+            TimeUnit::Millisecond => "ms",
         }
     }
 
@@ -69,7 +72,7 @@ impl Time {
     fn unitless_value(&self) -> CSSFloat {
         match self.unit {
             TimeUnit::Second => self.seconds,
-            TimeUnit::Millisecond => self.seconds * 1000.
+            TimeUnit::Millisecond => self.seconds * 1000.,
         }
     }
 
@@ -129,7 +132,8 @@ impl ToComputedValue for Time {
     type ComputedValue = ComputedTime;
 
     fn to_computed_value(&self, _context: &Context) -> Self::ComputedValue {
-        let seconds = self.calc_clamping_mode
+        let seconds = self
+            .calc_clamping_mode
             .map_or(self.seconds(), |mode| mode.clamp(self.seconds()));
 
         ComputedTime::from_seconds(crate::values::normalize(seconds))
@@ -158,7 +162,12 @@ impl ToCss for Time {
     where
         W: Write,
     {
-        crate::values::serialize_specified_dimension(self.unitless_value(), self.unit(), self.calc_clamping_mode.is_some(), dest)
+        crate::values::serialize_specified_dimension(
+            self.unitless_value(),
+            self.unit(),
+            self.calc_clamping_mode.is_some(),
+            dest,
+        )
     }
 }
 
diff --git a/components/to_shmem/lib.rs b/components/to_shmem/lib.rs
index 819ff8d6923..74f546ced22 100644
--- a/components/to_shmem/lib.rs
+++ b/components/to_shmem/lib.rs
@@ -434,7 +434,7 @@ where
             return Err(format!(
                 "ToShmem failed for HashSet: We only support empty sets \
                  (we don't expect custom properties in UA sheets, they're observable by content)",
-            ))
+            ));
         }
         Ok(ManuallyDrop::new(Self::default()))
     }
@@ -519,7 +519,7 @@ impl<T: ToShmem> ToShmem for ThinVec<T> {
     fn to_shmem(&self, builder: &mut SharedMemoryBuilder) -> Result<Self> {
         let len = self.len();
         if len == 0 {
-            return Ok(ManuallyDrop::new(Self::new()))
+            return Ok(ManuallyDrop::new(Self::new()));
         }
 
         assert_eq!(mem::size_of::<Self>(), mem::size_of::<*const ()>());
@@ -541,7 +541,11 @@ impl<T: ToShmem> ToShmem for ThinVec<T> {
         assert!(item_align <= header_size);
         let header_padding = 0;
 
-        let layout = Layout::from_size_align(header_size + header_padding + padded_size(item_size, item_align) * len, item_align).unwrap();
+        let layout = Layout::from_size_align(
+            header_size + header_padding + padded_size(item_size, item_align) * len,
+            item_align,
+        )
+        .unwrap();
 
         let shmem_header_ptr = builder.alloc::<u8>(layout);
         let shmem_data_ptr = unsafe { shmem_header_ptr.add(header_size + header_padding) };