From ebd19dfa4a404fd102c61975083bef7d78e858e6 Mon Sep 17 00:00:00 2001
From: Ting-Yu Lin <tlin@mozilla.com>
Date: Wed, 28 Sep 2022 07:10:52 +0000
Subject: [PATCH] Bug 1792615 - Run "cargo +nightly fmt" for style components
 in servo. r=emilio

The directories changed:
* servo/components/selectors/
* servo/components/style/
* servo/components/style_derive/
* servo/ports/geckolib/

Per review request, disable rustfmt in `components_to_transform_3d_matrix()` to
preserve the format for a call to `Transform3D::new`.

My mozilla-central is at
https://hg.mozilla.org/mozilla-central/rev/d1ae84015c22f2034435b47194fdced878072035

My nightly rust is 1.66.0-nightly (8b705839c 2022-09-26).

Differential Revision: https://phabricator.services.mozilla.com/D158234
---
 servo/components/selectors/builder.rs         |   4 +-
 servo/components/selectors/matching.rs        |  44 +++--
 servo/components/selectors/parser.rs          |  16 +-
 servo/components/style/animation.rs           |   3 +-
 .../style/applicable_declarations.rs          |   5 +-
 servo/components/style/custom_properties.rs   |  11 +-
 servo/components/style/font_face.rs           |  22 ++-
 .../components/style/gecko/media_features.rs  |  33 +++-
 servo/components/style/gecko/media_queries.rs |   6 +-
 .../style/gecko/snapshot_helpers.rs           |   3 +-
 servo/components/style/gecko/wrapper.rs       |  30 ++-
 .../invalidation/element/document_state.rs    |   4 +-
 .../element/state_and_attributes.rs           |   9 +-
 .../style/invalidation/stylesheets.rs         |   7 +-
 servo/components/style/lib.rs                 |   4 +-
 servo/components/style/matching.rs            |   9 +-
 .../style/media_queries/media_list.rs         |   4 +-
 .../style/media_queries/media_query.rs        |   8 +-
 servo/components/style/parallel.rs            |   5 +-
 servo/components/style/piecewise_linear.rs    |   5 +-
 .../style/properties/computed_value_flags.rs  |   1 -
 servo/components/style/queries/condition.rs   |   5 +-
 servo/components/style/queries/feature.rs     |   8 +-
 .../style/queries/feature_expression.rs       |  39 ++--
 servo/components/style/queries/mod.rs         |   2 +-
 servo/components/style/selector_map.rs        |  30 +--
 servo/components/style/sharing/checks.rs      |   3 +-
 servo/components/style/sharing/mod.rs         |  17 +-
 servo/components/style/style_adjuster.rs      |  12 +-
 servo/components/style/style_resolver.rs      |   2 +-
 .../style/stylesheets/container_rule.rs       |  62 ++++---
 servo/components/style/stylesheets/mod.rs     |   4 +-
 .../style/stylesheets/namespace_rule.rs       |   6 +-
 .../components/style/stylesheets/page_rule.rs |  12 +-
 .../style/stylesheets/rule_parser.rs          |  20 +-
 .../style/stylesheets/supports_rule.rs        |   2 +-
 servo/components/style/stylist.rs             |  67 ++++---
 servo/components/style/traversal.rs           |  13 +-
 .../components/style/values/animated/color.rs |  10 +-
 .../style/values/animated/transform.rs        |  37 ++--
 servo/components/style/values/computed/box.rs |   6 +-
 .../components/style/values/computed/color.rs |   2 +-
 .../components/style/values/computed/font.rs  | 112 ++++++++---
 .../style/values/computed/length.rs           |   6 +-
 .../values/computed/length_percentage.rs      |   6 +-
 servo/components/style/values/computed/mod.rs |  22 ++-
 servo/components/style/values/generics/box.rs |   2 +-
 .../components/style/values/generics/color.rs |  80 ++++++--
 .../style/values/generics/transform.rs        |  10 +-
 servo/components/style/values/mod.rs          |  51 ++++-
 .../components/style/values/specified/box.rs  |  63 +++++--
 .../components/style/values/specified/calc.rs |  31 ++--
 .../style/values/specified/color.rs           |   8 +-
 .../style/values/specified/easing.rs          |  25 ++-
 .../components/style/values/specified/font.rs |  12 +-
 .../style/values/specified/image.rs           |   8 +-
 .../style/values/specified/length.rs          | 175 ++++--------------
 .../components/style/values/specified/mod.rs  |   8 +-
 .../style/values/specified/percentage.rs      |   4 +-
 .../values/specified/source_size_list.rs      |   2 +-
 servo/components/style_derive/parse.rs        |  11 +-
 servo/components/style_derive/to_css.rs       |   5 +-
 servo/ports/geckolib/glue.rs                  |  89 +++++----
 .../ports/geckolib/tests/piecewise_linear.rs  |  16 +-
 64 files changed, 768 insertions(+), 570 deletions(-)

diff --git a/servo/components/selectors/builder.rs b/servo/components/selectors/builder.rs
index e329f2e25e1b..c63964627cde 100644
--- a/servo/components/selectors/builder.rs
+++ b/servo/components/selectors/builder.rs
@@ -326,9 +326,7 @@ where
             Component::NonTSPseudoClass(..) => {
                 specificity.class_like_selectors += 1;
             },
-            Component::Negation(ref list) |
-            Component::Is(ref list) |
-            Component::Has(ref list) => {
+            Component::Negation(ref list) | Component::Is(ref list) | Component::Has(ref list) => {
                 // https://drafts.csswg.org/selectors/#specificity-rules:
                 //
                 //     The specificity of an :is(), :not(), or :has() pseudo-class
diff --git a/servo/components/selectors/matching.rs b/servo/components/selectors/matching.rs
index 08d00176fe64..a6c9eecfa1f1 100644
--- a/servo/components/selectors/matching.rs
+++ b/servo/components/selectors/matching.rs
@@ -317,8 +317,7 @@ where
         debug_assert_eq!(next_sequence, Combinator::PseudoElement);
     }
 
-    let result =
-        matches_complex_selector_internal(iter, element, context, Rightmost::Yes);
+    let result = matches_complex_selector_internal(iter, element, context, Rightmost::Yes);
 
     matches!(result, SelectorMatchingResult::Matched)
 }
@@ -478,19 +477,13 @@ where
         selector_iter, element
     );
 
-    let matches_compound_selector = matches_compound_selector(
-        &mut selector_iter,
-        element,
-        context,
-        rightmost,
-    );
+    let matches_compound_selector =
+        matches_compound_selector(&mut selector_iter, element, context, rightmost);
 
     let combinator = selector_iter.next_sequence();
     if combinator.map_or(false, |c| c.is_sibling()) {
         if context.needs_selector_flags() {
-            element.apply_selector_flags(
-                ElementSelectorFlags::HAS_SLOW_SELECTOR_LATER_SIBLINGS
-            );
+            element.apply_selector_flags(ElementSelectorFlags::HAS_SLOW_SELECTOR_LATER_SIBLINGS);
         }
     }
 
@@ -528,7 +521,8 @@ where
             visited_handling = VisitedHandlingMode::AllLinksUnvisited;
         }
 
-        element = match next_element_for_combinator(&element, combinator, &selector_iter, &context) {
+        element = match next_element_for_combinator(&element, combinator, &selector_iter, &context)
+        {
             None => return candidate_not_found,
             Some(next_element) => next_element,
         };
@@ -768,9 +762,9 @@ where
         Component::Slotted(ref selector) => {
             // <slots> are never flattened tree slottables.
             !element.is_html_slot_element() &&
-                context.shared.nest(|context| {
-                    matches_complex_selector(selector.iter(), element, context)
-                })
+                context
+                    .shared
+                    .nest(|context| matches_complex_selector(selector.iter(), element, context))
         },
         Component::PseudoElement(ref pseudo) => {
             element.match_pseudo_element(pseudo, context.shared)
@@ -785,7 +779,10 @@ where
         },
         Component::NonTSPseudoClass(ref pc) => {
             if let Some((ref rightmost, ref iter)) = context.quirks_data {
-                if pc.is_active_or_hover() && !element.is_link() && hover_and_active_quirk_applies(iter, context.shared, *rightmost) {
+                if pc.is_active_or_hover() &&
+                    !element.is_link() &&
+                    hover_and_active_quirk_applies(iter, context.shared, *rightmost)
+                {
                     return false;
                 }
             }
@@ -794,7 +791,8 @@ where
         Component::FirstChild => matches_first_child(element, context.shared),
         Component::LastChild => matches_last_child(element, context.shared),
         Component::OnlyChild => {
-            matches_first_child(element, context.shared) && matches_last_child(element, context.shared)
+            matches_first_child(element, context.shared) &&
+                matches_last_child(element, context.shared)
         },
         Component::Root => element.is_root(),
         Component::Empty => {
@@ -809,9 +807,9 @@ where
                 .shadow_host()
                 .map_or(false, |host| host == element.opaque()) &&
                 selector.as_ref().map_or(true, |selector| {
-                    context.shared.nest(|context| {
-                        matches_complex_selector(selector.iter(), element, context)
-                    })
+                    context
+                        .shared
+                        .nest(|context| matches_complex_selector(selector.iter(), element, context))
                 })
         },
         Component::Scope => match context.shared.scope_element {
@@ -856,9 +854,9 @@ where
             }
             true
         }),
-        Component::Has(ref list) => context.shared.nest(|context| {
-            has_children_matching(list, element, context)
-        }),
+        Component::Has(ref list) => context
+            .shared
+            .nest(|context| has_children_matching(list, element, context)),
         Component::Combinator(_) => unsafe {
             debug_unreachable!("Shouldn't try to selector-match combinators")
         },
diff --git a/servo/components/selectors/parser.rs b/servo/components/selectors/parser.rs
index 43a68ec88023..26f71212d2d5 100644
--- a/servo/components/selectors/parser.rs
+++ b/servo/components/selectors/parser.rs
@@ -490,12 +490,18 @@ where
             Component::Class(ref class) if quirks_mode != QuirksMode::Quirks => {
                 class.precomputed_hash()
             },
-            Component::AttributeInNoNamespace { ref local_name, .. } if Impl::should_collect_attr_hash(local_name) => {
+            Component::AttributeInNoNamespace { ref local_name, .. }
+                if Impl::should_collect_attr_hash(local_name) =>
+            {
                 // AttributeInNoNamespace is only used when local_name ==
                 // local_name_lower.
                 local_name.precomputed_hash()
             },
-            Component::AttributeInNoNamespaceExists { ref local_name, ref local_name_lower, .. } => {
+            Component::AttributeInNoNamespaceExists {
+                ref local_name,
+                ref local_name_lower,
+                ..
+            } => {
                 // Only insert the local-name into the filter if it's all
                 // lowercase.  Otherwise we would need to test both hashes, and
                 // our data structures aren't really set up for that.
@@ -505,7 +511,9 @@ where
                 local_name.precomputed_hash()
             },
             Component::AttributeOther(ref selector) => {
-                if selector.local_name != selector.local_name_lower || !Impl::should_collect_attr_hash(&selector.local_name) {
+                if selector.local_name != selector.local_name_lower ||
+                    !Impl::should_collect_attr_hash(&selector.local_name)
+                {
                     continue;
                 }
                 selector.local_name.precomputed_hash()
@@ -1912,7 +1920,7 @@ where
                 _ if !in_attr_selector => {
                     input.reset(&after_star);
                     default_namespace(None)
-                }
+                },
                 result => {
                     let t = result?;
                     Err(after_star
diff --git a/servo/components/style/animation.rs b/servo/components/style/animation.rs
index 9724d3a9fd3d..46b812937e12 100644
--- a/servo/components/style/animation.rs
+++ b/servo/components/style/animation.rs
@@ -90,7 +90,8 @@ impl PropertyAnimation {
         // and whether the iteration is reversed. For now, we skip this calculation
         // by treating as if the flag is unset at all times.
         // https://drafts.csswg.org/css-easing/#step-timing-function-algo
-        self.timing_function.calculate_output(progress, BeforeFlag::Unset, epsilon)
+        self.timing_function
+            .calculate_output(progress, BeforeFlag::Unset, epsilon)
     }
 
     /// Update the given animation at a given point of progress.
diff --git a/servo/components/style/applicable_declarations.rs b/servo/components/style/applicable_declarations.rs
index 387dcdab07dc..a0dbb60da8e1 100644
--- a/servo/components/style/applicable_declarations.rs
+++ b/servo/components/style/applicable_declarations.rs
@@ -42,7 +42,10 @@ pub struct CascadePriority {
     layer_order: LayerOrder,
 }
 
-const_assert_eq!(std::mem::size_of::<CascadePriority>(), std::mem::size_of::<u32>());
+const_assert_eq!(
+    std::mem::size_of::<CascadePriority>(),
+    std::mem::size_of::<u32>()
+);
 
 impl PartialOrd for CascadePriority {
     #[inline]
diff --git a/servo/components/style/custom_properties.rs b/servo/components/style/custom_properties.rs
index 5de22993c6e9..63d4cd317954 100644
--- a/servo/components/style/custom_properties.rs
+++ b/servo/components/style/custom_properties.rs
@@ -126,7 +126,10 @@ static CHROME_ENVIRONMENT_VARIABLES: [EnvironmentVariable; 6] = [
         GTKCSDMaximizeButtonPosition,
         integer
     ),
-    make_variable!(atom!("-moz-content-preferred-color-scheme"), get_content_preferred_color_scheme),
+    make_variable!(
+        atom!("-moz-content-preferred-color-scheme"),
+        get_content_preferred_color_scheme
+    ),
 ];
 
 impl CssEnvironment {
@@ -783,7 +786,11 @@ impl<'a> CustomPropertiesBuilder<'a> {
 /// (meaning we should use the inherited value).
 ///
 /// It does cycle dependencies removal at the same time as substitution.
-fn substitute_all(custom_properties_map: &mut CustomPropertiesMap, seen: &PrecomputedHashSet<&Name>, device: &Device) {
+fn substitute_all(
+    custom_properties_map: &mut CustomPropertiesMap,
+    seen: &PrecomputedHashSet<&Name>,
+    device: &Device,
+) {
     // The cycle dependencies removal in this function is a variant
     // of Tarjan's algorithm. It is mostly based on the pseudo-code
     // listed in
diff --git a/servo/components/style/font_face.rs b/servo/components/style/font_face.rs
index ee8a852f631d..ca13d2e446b3 100644
--- a/servo/components/style/font_face.rs
+++ b/servo/components/style/font_face.rs
@@ -19,7 +19,9 @@ use crate::values::specified::font::SpecifiedFontFeatureSettings;
 use crate::values::specified::font::SpecifiedFontStyle;
 #[cfg(feature = "gecko")]
 use crate::values::specified::font::SpecifiedFontVariationSettings;
-use crate::values::specified::font::{AbsoluteFontWeight, FontStretch as SpecifiedFontStretch, MetricsOverride};
+use crate::values::specified::font::{
+    AbsoluteFontWeight, FontStretch as SpecifiedFontStretch, MetricsOverride,
+};
 use crate::values::specified::url::SpecifiedUrl;
 use crate::values::specified::{Angle, NonNegativePercentage};
 #[cfg(feature = "gecko")]
@@ -477,8 +479,9 @@ impl<'a> FontFace<'a> {
                         // We support only opentype fonts and truetype is an alias for
                         // that format. Sources without format hints need to be
                         // downloaded in case we support them.
-                        url_source.format_hint.as_ref().map_or(true,
-                            |hint| hint == "truetype" || hint == "opentype" || hint == "woff")
+                        url_source.format_hint.as_ref().map_or(true, |hint| {
+                            hint == "truetype" || hint == "opentype" || hint == "woff"
+                        })
                     } else {
                         true
                     }
@@ -547,16 +550,21 @@ impl Parse for Source {
         };
 
         // Parse optional tech()
-        let tech_flags = if static_prefs::pref!("layout.css.font-tech.enabled") && input
-            .try_parse(|input| input.expect_function_matching("tech"))
-            .is_ok()
+        let tech_flags = if static_prefs::pref!("layout.css.font-tech.enabled") &&
+            input
+                .try_parse(|input| input.expect_function_matching("tech"))
+                .is_ok()
         {
             input.parse_nested_block(|input| FontFaceSourceTechFlags::parse(context, input))?
         } else {
             FontFaceSourceTechFlags::empty()
         };
 
-        Ok(Source::Url(UrlSource { url, format_hint, tech_flags }))
+        Ok(Source::Url(UrlSource {
+            url,
+            format_hint,
+            tech_flags,
+        }))
     }
 }
 
diff --git a/servo/components/style/gecko/media_features.rs b/servo/components/style/gecko/media_features.rs
index a0cd13291354..614d12135d80 100644
--- a/servo/components/style/gecko/media_features.rs
+++ b/servo/components/style/gecko/media_features.rs
@@ -6,10 +6,10 @@
 
 use crate::gecko_bindings::bindings;
 use crate::gecko_bindings::structs;
+use crate::media_queries::{Device, MediaType};
 use crate::queries::feature::{AllowsRanges, Evaluator, FeatureFlags, QueryFeatureDescription};
 use crate::queries::values::Orientation;
-use crate::media_queries::{Device, MediaType};
-use crate::values::computed::{Context, CSSPixelLength, Ratio, Resolution};
+use crate::values::computed::{CSSPixelLength, Context, Ratio, Resolution};
 use app_units::Au;
 use euclid::default::Size2D;
 
@@ -89,7 +89,11 @@ pub enum DisplayMode {
 /// https://w3c.github.io/manifest/#the-display-mode-media-feature
 fn eval_display_mode(context: &Context, query_value: Option<DisplayMode>) -> bool {
     match query_value {
-        Some(v) => v == unsafe { bindings::Gecko_MediaFeatures_GetDisplayMode(context.device().document()) },
+        Some(v) => {
+            v == unsafe {
+                bindings::Gecko_MediaFeatures_GetDisplayMode(context.device().document())
+            }
+        },
         None => true,
     }
 }
@@ -139,7 +143,8 @@ fn eval_monochrome(context: &Context) -> u32 {
 
 /// https://drafts.csswg.org/mediaqueries-4/#resolution
 fn eval_resolution(context: &Context) -> Resolution {
-    let resolution_dppx = unsafe { bindings::Gecko_MediaFeatures_GetResolution(context.device().document()) };
+    let resolution_dppx =
+        unsafe { bindings::Gecko_MediaFeatures_GetResolution(context.device().document()) };
     Resolution::from_dppx(resolution_dppx)
 }
 
@@ -172,7 +177,10 @@ pub enum DynamicRange {
 }
 
 /// https://drafts.csswg.org/mediaqueries-5/#prefers-reduced-motion
-fn eval_prefers_reduced_motion(context: &Context, query_value: Option<PrefersReducedMotion>) -> bool {
+fn eval_prefers_reduced_motion(
+    context: &Context,
+    query_value: Option<PrefersReducedMotion>,
+) -> bool {
     let prefers_reduced =
         unsafe { bindings::Gecko_MediaFeatures_PrefersReducedMotion(context.device().document()) };
     let query_value = match query_value {
@@ -317,8 +325,9 @@ fn do_eval_prefers_color_scheme(
     use_content: bool,
     query_value: Option<PrefersColorScheme>,
 ) -> bool {
-    let prefers_color_scheme =
-        unsafe { bindings::Gecko_MediaFeatures_PrefersColorScheme(context.device().document(), use_content) };
+    let prefers_color_scheme = unsafe {
+        bindings::Gecko_MediaFeatures_PrefersColorScheme(context.device().document(), use_content)
+    };
     match query_value {
         Some(v) => prefers_color_scheme == v,
         None => true,
@@ -867,7 +876,13 @@ pub static MEDIA_FEATURES: [QueryFeatureDescription; 61] = [
         GTKCSDReversedPlacement
     ),
     lnf_int_feature!(atom!("-moz-system-dark-theme"), SystemUsesDarkTheme),
-    bool_pref_feature!(atom!("-moz-box-flexbox-emulation"), "layout.css.moz-box-flexbox-emulation.enabled"),
+    bool_pref_feature!(
+        atom!("-moz-box-flexbox-emulation"),
+        "layout.css.moz-box-flexbox-emulation.enabled"
+    ),
     // media query for MathML Core's implementation of maction/semantics
-    bool_pref_feature!(atom!("-moz-mathml-core-maction-and-semantics"), "mathml.legacy_maction_and_semantics_implementations.disabled"),
+    bool_pref_feature!(
+        atom!("-moz-mathml-core-maction-and-semantics"),
+        "mathml.legacy_maction_and_semantics_implementations.disabled"
+    ),
 ];
diff --git a/servo/components/style/gecko/media_queries.rs b/servo/components/style/gecko/media_queries.rs
index 9651762b8da2..ac64e6b5f34a 100644
--- a/servo/components/style/gecko/media_queries.rs
+++ b/servo/components/style/gecko/media_queries.rs
@@ -13,8 +13,8 @@ use crate::gecko_bindings::structs;
 use crate::media_queries::MediaType;
 use crate::properties::ComputedValues;
 use crate::string_cache::Atom;
-use crate::values::computed::{ColorScheme, Length};
 use crate::values::computed::font::GenericFontFamily;
+use crate::values::computed::{ColorScheme, Length};
 use crate::values::specified::color::SystemColor;
 use crate::values::specified::font::FONT_MEDIUM_PX;
 use crate::values::specified::ViewportVariant;
@@ -172,9 +172,7 @@ impl Device {
 
     /// Gets the base size given a generic font family and a language.
     pub fn base_size_for_generic(&self, language: &Atom, generic: GenericFontFamily) -> Length {
-        unsafe {
-            bindings::Gecko_GetBaseSize(self.document(), language.as_ptr(), generic)
-        }
+        unsafe { bindings::Gecko_GetBaseSize(self.document(), language.as_ptr(), generic) }
     }
 
     /// Queries font metrics
diff --git a/servo/components/style/gecko/snapshot_helpers.rs b/servo/components/style/gecko/snapshot_helpers.rs
index d75cd275310c..992a36528200 100644
--- a/servo/components/style/gecko/snapshot_helpers.rs
+++ b/servo/components/style/gecko/snapshot_helpers.rs
@@ -51,7 +51,8 @@ unsafe fn get_class_or_part_from_attr(attr: &structs::nsAttrValue) -> Class {
             .__bindgen_anon_1
             .mAtomArray
             .as_ref();
-        let array = (*attr_array).mArray.as_ptr() as *const structs::nsTArray<structs::RefPtr<nsAtom>>;
+        let array =
+            (*attr_array).mArray.as_ptr() as *const structs::nsTArray<structs::RefPtr<nsAtom>>;
         return Class::More(&**array);
     }
     debug_assert_eq!(base_type, structs::nsAttrValue_ValueBaseType_eStringBase);
diff --git a/servo/components/style/gecko/wrapper.rs b/servo/components/style/gecko/wrapper.rs
index 89d8ed9a696d..e0fded22e229 100644
--- a/servo/components/style/gecko/wrapper.rs
+++ b/servo/components/style/gecko/wrapper.rs
@@ -19,7 +19,6 @@ use crate::author_styles::AuthorStyles;
 use crate::context::{PostAnimationTasks, QuirksMode, SharedStyleContext, UpdateAnimationsTasks};
 use crate::data::ElementData;
 use crate::dom::{LayoutIterator, NodeInfo, OpaqueNode, TDocument, TElement, TNode, TShadowRoot};
-use dom::{DocumentState, ElementState};
 use crate::gecko::data::GeckoStyleSheet;
 use crate::gecko::selector_parser::{NonTSPseudoClass, PseudoElement, SelectorImpl};
 use crate::gecko::snapshot_helpers;
@@ -67,8 +66,9 @@ use crate::values::{AtomIdent, AtomString};
 use crate::CaseSensitivityExt;
 use crate::LocalName;
 use app_units::Au;
-use euclid::default::Size2D;
 use atomic_refcell::{AtomicRef, AtomicRefCell, AtomicRefMut};
+use dom::{DocumentState, ElementState};
+use euclid::default::Size2D;
 use fxhash::FxHashMap;
 use selectors::attr::{AttrSelectorOperation, AttrSelectorOperator};
 use selectors::attr::{CaseSensitivity, NamespaceConstraint};
@@ -77,11 +77,11 @@ use selectors::matching::{ElementSelectorFlags, MatchingContext};
 use selectors::sink::Push;
 use selectors::{Element, OpaqueElement};
 use servo_arc::{Arc, ArcBorrow, RawOffsetArc};
-use std::sync::atomic::{AtomicU32, Ordering};
 use std::fmt;
 use std::hash::{Hash, Hasher};
 use std::mem;
 use std::ptr;
+use std::sync::atomic::{AtomicU32, Ordering};
 
 #[inline]
 fn elements_with_id<'a, 'le>(
@@ -275,16 +275,15 @@ impl<'ln> GeckoNode<'ln> {
         #[allow(dead_code)]
         fn static_assert() {
             let _: [u8; std::mem::size_of::<Cell<u32>>()] = [0u8; std::mem::size_of::<AtomicU32>()];
-            let _: [u8; std::mem::align_of::<Cell<u32>>()] = [0u8; std::mem::align_of::<AtomicU32>()];
+            let _: [u8; std::mem::align_of::<Cell<u32>>()] =
+                [0u8; std::mem::align_of::<AtomicU32>()];
         }
 
         // Rust doesn't provide standalone atomic functions like GCC/clang do
         // (via the atomic intrinsics) or via std::atomic_ref, but it guarantees
         // that the memory representation of u32 and AtomicU32 matches:
         // https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU32.html
-        unsafe {
-            std::mem::transmute::<&Cell<u32>, &AtomicU32>(flags)
-        }
+        unsafe { std::mem::transmute::<&Cell<u32>, &AtomicU32>(flags) }
     }
 
     #[inline]
@@ -677,12 +676,16 @@ impl<'le> GeckoElement<'le> {
 
     #[inline]
     fn set_flags(&self, flags: u32) {
-        self.as_node().flags_atomic().fetch_or(flags, Ordering::Relaxed);
+        self.as_node()
+            .flags_atomic()
+            .fetch_or(flags, Ordering::Relaxed);
     }
 
     #[inline]
     unsafe fn unset_flags(&self, flags: u32) {
-        self.as_node().flags_atomic().fetch_and(!flags, Ordering::Relaxed);
+        self.as_node()
+            .flags_atomic()
+            .fetch_and(!flags, Ordering::Relaxed);
     }
 
     /// Returns true if this element has descendants for lazy frame construction.
@@ -1044,7 +1047,14 @@ impl<'le> TElement for GeckoElement<'le> {
         }
 
         unsafe {
-            let frame = self.0._base._base._base.__bindgen_anon_1.mPrimaryFrame.as_ref();
+            let frame = self
+                .0
+                ._base
+                ._base
+                ._base
+                .__bindgen_anon_1
+                .mPrimaryFrame
+                .as_ref();
             if frame.is_null() {
                 return Size2D::zero();
             }
diff --git a/servo/components/style/invalidation/element/document_state.rs b/servo/components/style/invalidation/element/document_state.rs
index 5b308cbdfa4d..2079d78bb58a 100644
--- a/servo/components/style/invalidation/element/document_state.rs
+++ b/servo/components/style/invalidation/element/document_state.rs
@@ -11,7 +11,9 @@ use crate::invalidation::element::invalidator::{Invalidation, InvalidationProces
 use crate::invalidation::element::state_and_attributes;
 use crate::stylist::CascadeData;
 use dom::DocumentState;
-use selectors::matching::{MatchingContext, MatchingMode, QuirksMode, VisitedHandlingMode, NeedsSelectorFlags};
+use selectors::matching::{
+    MatchingContext, MatchingMode, NeedsSelectorFlags, QuirksMode, VisitedHandlingMode,
+};
 
 /// A struct holding the members necessary to invalidate document state
 /// selectors.
diff --git a/servo/components/style/invalidation/element/state_and_attributes.rs b/servo/components/style/invalidation/element/state_and_attributes.rs
index 6d4b094e2a38..4d71a35ada58 100644
--- a/servo/components/style/invalidation/element/state_and_attributes.rs
+++ b/servo/components/style/invalidation/element/state_and_attributes.rs
@@ -19,7 +19,9 @@ use crate::stylesheets::origin::OriginSet;
 use crate::{Atom, WeakAtom};
 use dom::ElementState;
 use selectors::attr::CaseSensitivity;
-use selectors::matching::{matches_selector, MatchingContext, MatchingMode, VisitedHandlingMode, NeedsSelectorFlags};
+use selectors::matching::{
+    matches_selector, MatchingContext, MatchingMode, NeedsSelectorFlags, VisitedHandlingMode,
+};
 use selectors::NthIndexCache;
 use smallvec::SmallVec;
 
@@ -410,10 +412,7 @@ where
         self.collect_state_dependencies(&map.state_affecting_selectors)
     }
 
-    fn collect_state_dependencies(
-        &mut self,
-        map: &'selectors SelectorMap<StateDependency>,
-    ) {
+    fn collect_state_dependencies(&mut self, map: &'selectors SelectorMap<StateDependency>) {
         if self.state_changes.is_empty() {
             return;
         }
diff --git a/servo/components/style/invalidation/stylesheets.rs b/servo/components/style/invalidation/stylesheets.rs
index 2dadba31bada..b367e18daa92 100644
--- a/servo/components/style/invalidation/stylesheets.rs
+++ b/servo/components/style/invalidation/stylesheets.rs
@@ -18,8 +18,8 @@ use crate::shared_lock::SharedRwLockReadGuard;
 use crate::stylesheets::{CssRule, StylesheetInDocument};
 use crate::stylesheets::{EffectiveRules, EffectiveRulesIterator};
 use crate::values::AtomIdent;
-use crate::{Atom, ShrinkIfNeeded};
 use crate::LocalName as SelectorLocalName;
+use crate::{Atom, ShrinkIfNeeded};
 use selectors::parser::{Component, LocalName, Selector};
 
 /// The kind of change that happened for a given rule.
@@ -632,10 +632,7 @@ impl StylesheetInvalidationSet {
                     // existing elements.
                 }
             },
-            CounterStyle(..) |
-            Page(..) |
-            Viewport(..) |
-            FontFeatureValues(..) => {
+            CounterStyle(..) | Page(..) | Viewport(..) | FontFeatureValues(..) => {
                 debug!(
                     " > Found unsupported rule, marking the whole subtree \
                      invalid."
diff --git a/servo/components/style/lib.rs b/servo/components/style/lib.rs
index a72d3d8d7e38..94a492cade75 100644
--- a/servo/components/style/lib.rs
+++ b/servo/components/style/lib.rs
@@ -162,7 +162,7 @@ pub use style_traits::arc_slice::ArcSlice;
 pub use style_traits::owned_slice::OwnedSlice;
 pub use style_traits::owned_str::OwnedStr;
 
-use std::hash::{Hash, BuildHasher};
+use std::hash::{BuildHasher, Hash};
 
 /// The CSS properties supported by the style system.
 /// Generated from the properties.mako.rs template by build.rs
@@ -300,7 +300,7 @@ impl From<std::collections::TryReserveError> for AllocErr {
 }
 
 /// Shrink the capacity of the collection if needed.
-pub (crate) trait ShrinkIfNeeded {
+pub(crate) trait ShrinkIfNeeded {
     fn shrink_if_needed(&mut self);
 }
 
diff --git a/servo/components/style/matching.rs b/servo/components/style/matching.rs
index 4ba9f1576d7f..9cd2258881ba 100644
--- a/servo/components/style/matching.rs
+++ b/servo/components/style/matching.rs
@@ -900,8 +900,13 @@ pub trait MatchMethods: TElement {
         let new_primary_style = data.styles.primary.as_ref().unwrap();
 
         let mut restyle_requirement = ChildRestyleRequirement::CanSkipCascade;
-        let is_root = new_primary_style.flags.contains(ComputedValueFlags::IS_ROOT_ELEMENT_STYLE);
-        let is_container = !new_primary_style.get_box().clone_container_type().is_empty();
+        let is_root = new_primary_style
+            .flags
+            .contains(ComputedValueFlags::IS_ROOT_ELEMENT_STYLE);
+        let is_container = !new_primary_style
+            .get_box()
+            .clone_container_type()
+            .is_empty();
         if is_root || is_container {
             let new_font_size = new_primary_style.get_font().clone_font_size();
             let old_font_size = old_styles
diff --git a/servo/components/style/media_queries/media_list.rs b/servo/components/style/media_queries/media_list.rs
index 8ce317db5346..f97b718cf5cd 100644
--- a/servo/components/style/media_queries/media_list.rs
+++ b/servo/components/style/media_queries/media_list.rs
@@ -84,8 +84,8 @@ impl MediaList {
                 let media_match = mq.media_type.matches(device.media_type());
 
                 // Check if the media condition match.
-                let query_match = media_match &&
-                    mq.condition.as_ref().map_or(true, |c| c.matches(context));
+                let query_match =
+                    media_match && mq.condition.as_ref().map_or(true, |c| c.matches(context));
 
                 // Apply the logical NOT qualifier to the result
                 match mq.qualifier {
diff --git a/servo/components/style/media_queries/media_query.rs b/servo/components/style/media_queries/media_query.rs
index 1e737fa695f9..da34bdee5715 100644
--- a/servo/components/style/media_queries/media_query.rs
+++ b/servo/components/style/media_queries/media_query.rs
@@ -6,8 +6,8 @@
 //!
 //! https://drafts.csswg.org/mediaqueries/#typedef-media-query
 
-use crate::queries::{QueryCondition, FeatureType};
 use crate::parser::ParserContext;
+use crate::queries::{FeatureType, QueryCondition};
 use crate::str::string_as_ascii_lowercase;
 use crate::values::CustomIdent;
 use crate::Atom;
@@ -136,7 +136,11 @@ impl MediaQuery {
         let condition = if explicit_media_type.is_none() {
             Some(QueryCondition::parse(context, input, FeatureType::Media)?)
         } else if input.try_parse(|i| i.expect_ident_matching("and")).is_ok() {
-            Some(QueryCondition::parse_disallow_or(context, input, FeatureType::Media)?)
+            Some(QueryCondition::parse_disallow_or(
+                context,
+                input,
+                FeatureType::Media,
+            )?)
         } else {
             None
         };
diff --git a/servo/components/style/parallel.rs b/servo/components/style/parallel.rs
index 665b1548cb60..fea031115a72 100644
--- a/servo/components/style/parallel.rs
+++ b/servo/components/style/parallel.rs
@@ -75,9 +75,8 @@ type WorkUnit<N> = ArrayVec<SendNode<N>, WORK_UNIT_MAX>;
 /// out of line so we don't allocate stack space for the entire struct
 /// in the caller.
 #[inline(never)]
-fn create_thread_local_context<'scope, E>(
-    slot: &mut Option<ThreadLocalStyleContext<E>>,
-) where
+fn create_thread_local_context<'scope, E>(slot: &mut Option<ThreadLocalStyleContext<E>>)
+where
     E: TElement + 'scope,
 {
     *slot = Some(ThreadLocalStyleContext::new());
diff --git a/servo/components/style/piecewise_linear.rs b/servo/components/style/piecewise_linear.rs
index c4a4d7051ab5..9259a086bd2d 100644
--- a/servo/components/style/piecewise_linear.rs
+++ b/servo/components/style/piecewise_linear.rs
@@ -230,7 +230,10 @@ impl PiecewiseLinearFunctionBuilder {
         }
         // Guaranteed at least two elements.
         // Start element's x value should've been assigned when the first value was pushed.
-        debug_assert!(self.entries[0].x.is_some(), "Expected an entry with x defined!");
+        debug_assert!(
+            self.entries[0].x.is_some(),
+            "Expected an entry with x defined!"
+        );
         // Spec asserts that if the last entry does not have an x value, it is assigned the largest seen x value.
         self.entries
             .last_mut()
diff --git a/servo/components/style/properties/computed_value_flags.rs b/servo/components/style/properties/computed_value_flags.rs
index 3ed1f6f2787d..01c23ba73ad3 100644
--- a/servo/components/style/properties/computed_value_flags.rs
+++ b/servo/components/style/properties/computed_value_flags.rs
@@ -114,7 +114,6 @@ impl ComputedValueFlags {
             Self::HAS_TEXT_DECORATION_LINES |
             Self::IS_IN_OPACITY_ZERO_SUBTREE |
             Self::SELF_OR_ANCESTOR_HAS_CONTAIN_STYLE
-
     }
 
     /// Flags that may be propagated to descendants.
diff --git a/servo/components/style/queries/condition.rs b/servo/components/style/queries/condition.rs
index da8ad02d595b..01f7ff1bfd71 100644
--- a/servo/components/style/queries/condition.rs
+++ b/servo/components/style/queries/condition.rs
@@ -7,7 +7,7 @@
 //! https://drafts.csswg.org/mediaqueries-4/#typedef-media-condition
 //! https://drafts.csswg.org/css-contain-3/#typedef-container-condition
 
-use super::{QueryFeatureExpression, FeatureType, FeatureFlags};
+use super::{FeatureFlags, FeatureType, QueryFeatureExpression};
 use crate::parser::ParserContext;
 use crate::values::computed;
 use cssparser::{Parser, Token};
@@ -197,7 +197,8 @@ impl QueryCondition {
             if let Ok(inner) = input.try_parse(|i| Self::parse(context, i, feature_type)) {
                 return Ok(QueryCondition::InParens(Box::new(inner)));
             }
-            let expr = QueryFeatureExpression::parse_in_parenthesis_block(context, input, feature_type)?;
+            let expr =
+                QueryFeatureExpression::parse_in_parenthesis_block(context, input, feature_type)?;
             Ok(QueryCondition::Feature(expr))
         })
     }
diff --git a/servo/components/style/queries/feature.rs b/servo/components/style/queries/feature.rs
index 9efd64f8c237..19340f8e2400 100644
--- a/servo/components/style/queries/feature.rs
+++ b/servo/components/style/queries/feature.rs
@@ -5,7 +5,7 @@
 //! Query features.
 
 use crate::parser::ParserContext;
-use crate::values::computed::{self, CSSPixelLength, Resolution, Ratio};
+use crate::values::computed::{self, CSSPixelLength, Ratio, Resolution};
 use crate::Atom;
 use cssparser::Parser;
 use std::fmt;
@@ -66,10 +66,8 @@ macro_rules! keyword_evaluator {
         fn __parse<'i, 't>(
             context: &$crate::parser::ParserContext,
             input: &mut $crate::cssparser::Parser<'i, 't>,
-        ) -> Result<
-            $crate::queries::feature::KeywordDiscriminant,
-            ::style_traits::ParseError<'i>,
-        > {
+        ) -> Result<$crate::queries::feature::KeywordDiscriminant, ::style_traits::ParseError<'i>>
+        {
             let kw = <$keyword_type as $crate::parser::Parse>::parse(context, input)?;
             Ok(kw as $crate::queries::feature::KeywordDiscriminant)
         }
diff --git a/servo/components/style/queries/feature_expression.rs b/servo/components/style/queries/feature_expression.rs
index 0acf822955cf..74efa2fa8d05 100644
--- a/servo/components/style/queries/feature_expression.rs
+++ b/servo/components/style/queries/feature_expression.rs
@@ -6,7 +6,7 @@
 //! `(width >= 400px)`.
 
 use super::feature::{Evaluator, QueryFeatureDescription};
-use super::feature::{KeywordDiscriminant, FeatureFlags};
+use super::feature::{FeatureFlags, KeywordDiscriminant};
 use crate::parser::{Parse, ParserContext};
 use crate::str::{starts_with_ignore_ascii_case, string_as_ascii_lowercase};
 use crate::values::computed::{self, Ratio, ToComputedValue};
@@ -43,7 +43,10 @@ impl FeatureType {
     }
 
     fn find_feature(&self, name: &Atom) -> Option<(usize, &'static QueryFeatureDescription)> {
-        self.features().iter().enumerate().find(|(_, f)| f.name == *name)
+        self.features()
+            .iter()
+            .enumerate()
+            .find(|(_, f)| f.name == *name)
     }
 }
 
@@ -92,8 +95,12 @@ impl Operator {
         // context.
         match self {
             Self::Equal => false,
-            Self::GreaterThan | Self::GreaterThanEqual => matches!(right_op, Self::GreaterThan | Self::GreaterThanEqual),
-            Self::LessThan | Self::LessThanEqual => matches!(right_op, Self::LessThan | Self::LessThanEqual),
+            Self::GreaterThan | Self::GreaterThanEqual => {
+                matches!(right_op, Self::GreaterThan | Self::GreaterThanEqual)
+            },
+            Self::LessThan | Self::LessThanEqual => {
+                matches!(right_op, Self::LessThan | Self::LessThanEqual)
+            },
         }
     }
 
@@ -478,9 +485,7 @@ impl QueryFeatureExpression {
         let right = match right_op {
             Some(op) => {
                 if !left_op.is_compatible_with(op) {
-                    return Err(
-                        input.new_custom_error(StyleParseErrorKind::UnspecifiedError)
-                    );
+                    return Err(input.new_custom_error(StyleParseErrorKind::UnspecifiedError));
                 }
                 Some((op, QueryExpressionValue::parse(feature, context, input)?))
             },
@@ -583,9 +588,8 @@ impl QueryFeatureExpression {
         match self.feature().evaluator {
             Evaluator::Length(eval) => {
                 let v = eval(context);
-                self.kind.evaluate(v, |v| {
-                    expect!(Length, v).to_computed_value(context)
-                })
+                self.kind
+                    .evaluate(v, |v| expect!(Length, v).to_computed_value(context))
             },
             Evaluator::Integer(eval) => {
                 let v = eval(context);
@@ -594,14 +598,15 @@ impl QueryFeatureExpression {
             Evaluator::Float(eval) => {
                 let v = eval(context);
                 self.kind.evaluate(v, |v| *expect!(Float, v))
-            }
+            },
             Evaluator::NumberRatio(eval) => {
                 let ratio = eval(context);
                 // A ratio of 0/0 behaves as the ratio 1/0, so we need to call used_value()
                 // to convert it if necessary.
                 // FIXME: we may need to update here once
                 // https://github.com/w3c/csswg-drafts/issues/4954 got resolved.
-                self.kind.evaluate(ratio, |v| expect!(NumberRatio, v).used_value())
+                self.kind
+                    .evaluate(ratio, |v| expect!(NumberRatio, v).used_value())
             },
             Evaluator::Resolution(eval) => {
                 let v = eval(context).dppx();
@@ -610,11 +615,17 @@ impl QueryFeatureExpression {
                 })
             },
             Evaluator::Enumerated { evaluator, .. } => {
-                let computed = self.kind.non_ranged_value().map(|v| *expect!(Enumerated, v));
+                let computed = self
+                    .kind
+                    .non_ranged_value()
+                    .map(|v| *expect!(Enumerated, v));
                 evaluator(context, computed)
             },
             Evaluator::BoolInteger(eval) => {
-                let computed = self.kind.non_ranged_value().map(|v| *expect!(BoolInteger, v));
+                let computed = self
+                    .kind
+                    .non_ranged_value()
+                    .map(|v| *expect!(BoolInteger, v));
                 let boolean = eval(context);
                 computed.map_or(boolean, |v| v == boolean)
             },
diff --git a/servo/components/style/queries/mod.rs b/servo/components/style/queries/mod.rs
index 6bbf197c43bb..c68d0b30b392 100644
--- a/servo/components/style/queries/mod.rs
+++ b/servo/components/style/queries/mod.rs
@@ -16,4 +16,4 @@ pub mod values;
 
 pub use self::condition::QueryCondition;
 pub use self::feature::FeatureFlags;
-pub use self::feature_expression::{QueryFeatureExpression, FeatureType};
+pub use self::feature_expression::{FeatureType, QueryFeatureExpression};
diff --git a/servo/components/style/selector_map.rs b/servo/components/style/selector_map.rs
index bfb689f10375..e1b0e576c2f1 100644
--- a/servo/components/style/selector_map.rs
+++ b/servo/components/style/selector_map.rs
@@ -42,12 +42,12 @@ impl Default for PrecomputedHasher {
 /// these pseudo-class states.
 const RARE_PSEUDO_CLASS_STATES: ElementState = ElementState::from_bits_truncate(
     ElementState::FULLSCREEN.bits() |
-    ElementState::VISITED_OR_UNVISITED.bits() |
-    ElementState::URLTARGET.bits() |
-    ElementState::INERT.bits() |
-    ElementState::FOCUS.bits() |
-    ElementState::FOCUSRING.bits() |
-    ElementState::TOPMOST_MODAL.bits()
+        ElementState::VISITED_OR_UNVISITED.bits() |
+        ElementState::URLTARGET.bits() |
+        ElementState::INERT.bits() |
+        ElementState::FOCUS.bits() |
+        ElementState::FOCUSRING.bits() |
+        ElementState::TOPMOST_MODAL.bits(),
 );
 
 /// A simple alias for a hashmap using PrecomputedHasher.
@@ -290,7 +290,10 @@ impl SelectorMap<Rule> {
             )
         }
 
-        if rule_hash_target.state().intersects(RARE_PSEUDO_CLASS_STATES) {
+        if rule_hash_target
+            .state()
+            .intersects(RARE_PSEUDO_CLASS_STATES)
+        {
             SelectorMap::get_matching_rules(
                 element,
                 &self.rare_pseudo_classes,
@@ -349,13 +352,16 @@ impl SelectorMap<Rule> {
             }
 
             if rule.container_condition_id != ContainerConditionId::none() {
-                if !cascade_data.container_condition_matches(rule.container_condition_id, stylist, element) {
+                if !cascade_data.container_condition_matches(
+                    rule.container_condition_id,
+                    stylist,
+                    element,
+                ) {
                     continue;
                 }
             }
 
-            matching_rules
-                .push(rule.to_applicable_declaration_block(cascade_level, cascade_data));
+            matching_rules.push(rule.to_applicable_declaration_block(cascade_level, cascade_data));
         }
     }
 }
@@ -794,9 +800,7 @@ fn find_bucket<'a>(
 
 /// Wrapper for PrecomputedHashMap that does ASCII-case-insensitive lookup in quirks mode.
 #[derive(Clone, Debug, MallocSizeOf)]
-pub struct MaybeCaseInsensitiveHashMap<K: PrecomputedHash + Hash + Eq, V>(
-    PrecomputedHashMap<K, V>,
-);
+pub struct MaybeCaseInsensitiveHashMap<K: PrecomputedHash + Hash + Eq, V>(PrecomputedHashMap<K, V>);
 
 impl<V> Default for MaybeCaseInsensitiveHashMap<Atom, V> {
     #[inline]
diff --git a/servo/components/style/sharing/checks.rs b/servo/components/style/sharing/checks.rs
index 2f8f410190f7..42c7110dce8f 100644
--- a/servo/components/style/sharing/checks.rs
+++ b/servo/components/style/sharing/checks.rs
@@ -126,8 +126,7 @@ where
 {
     let stylist = &shared_context.stylist;
 
-    let for_element =
-        target.revalidation_match_results(stylist, bloom, nth_index_cache);
+    let for_element = target.revalidation_match_results(stylist, bloom, nth_index_cache);
 
     let for_candidate = candidate.revalidation_match_results(stylist, bloom, nth_index_cache);
 
diff --git a/servo/components/style/sharing/mod.rs b/servo/components/style/sharing/mod.rs
index 91e4f02e084c..28883d6d1394 100644
--- a/servo/components/style/sharing/mod.rs
+++ b/servo/components/style/sharing/mod.rs
@@ -75,7 +75,7 @@ use crate::stylist::Stylist;
 use crate::values::AtomIdent;
 use atomic_refcell::{AtomicRefCell, AtomicRefMut};
 use owning_ref::OwningHandle;
-use selectors::matching::{VisitedHandlingMode, NeedsSelectorFlags};
+use selectors::matching::{NeedsSelectorFlags, VisitedHandlingMode};
 use selectors::NthIndexCache;
 use servo_arc::Arc;
 use smallbitvec::SmallBitVec;
@@ -434,12 +434,7 @@ impl<E: TElement> StyleSharingTarget<E> {
             self.element.traversal_parent()
         );
 
-        cache.share_style_if_possible(
-            shared_context,
-            bloom_filter,
-            nth_index_cache,
-            self,
-        )
+        cache.share_style_if_possible(shared_context, bloom_filter, nth_index_cache, self)
     }
 
     /// Gets the validation data used to match against this target, if any.
@@ -800,13 +795,7 @@ impl<E: TElement> StyleSharingCache<E> {
             return None;
         }
 
-        if !checks::revalidate(
-            target,
-            candidate,
-            shared,
-            bloom,
-            nth_index_cache,
-        ) {
+        if !checks::revalidate(target, candidate, shared, bloom, nth_index_cache) {
             trace!("Miss: Revalidation");
             return None;
         }
diff --git a/servo/components/style/style_adjuster.rs b/servo/components/style/style_adjuster.rs
index b220b4fbaee8..858c283e8dd2 100644
--- a/servo/components/style/style_adjuster.rs
+++ b/servo/components/style/style_adjuster.rs
@@ -14,7 +14,6 @@ use crate::properties::longhands::overflow_x::computed_value::T as Overflow;
 use crate::properties::longhands::position::computed_value::T as Position;
 use crate::properties::{self, ComputedValues, StyleBuilder};
 
-
 /// A struct that implements all the adjustment methods.
 ///
 /// NOTE(emilio): If new adjustments are introduced that depend on reset
@@ -158,8 +157,8 @@ impl<'a, 'b: 'a> StyleAdjuster<'a, 'b> {
     /// https://bugzilla.mozilla.org/show_bug.cgi?id=1786147#c10
     fn adjust_for_webkit_line_clamp(&mut self) {
         use crate::properties::longhands::_moz_box_orient::computed_value::T as BoxOrient;
-        use crate::values::specified::box_::{DisplayOutside, DisplayInside};
-        let box_style= self.style.get_box();
+        use crate::values::specified::box_::{DisplayInside, DisplayOutside};
+        let box_style = self.style.get_box();
         if box_style.clone__webkit_line_clamp().is_none() {
             return;
         }
@@ -176,7 +175,9 @@ impl<'a, 'b: 'a> StyleAdjuster<'a, 'b> {
             debug_assert_eq!(disp.outside(), DisplayOutside::Inline);
             Display::InlineBlock
         };
-        self.style.mutate_box().set_adjusted_display(new_display, false);
+        self.style
+            .mutate_box()
+            .set_adjusted_display(new_display, false);
     }
 
     /// CSS 2.1 section 9.7:
@@ -277,7 +278,8 @@ impl<'a, 'b: 'a> StyleAdjuster<'a, 'b> {
                 .add_flags(ComputedValueFlags::IS_ROOT_ELEMENT_STYLE);
         }
 
-        if self.style
+        if self
+            .style
             .get_box()
             .clone_contain()
             .contains(SpecifiedValue::STYLE)
diff --git a/servo/components/style/style_resolver.rs b/servo/components/style/style_resolver.rs
index 7d6135b876f1..e787e19d1768 100644
--- a/servo/components/style/style_resolver.rs
+++ b/servo/components/style/style_resolver.rs
@@ -15,7 +15,7 @@ use crate::rule_tree::StrongRuleNode;
 use crate::selector_parser::{PseudoElement, SelectorImpl};
 use crate::stylist::RuleInclusion;
 use log::Level::Trace;
-use selectors::matching::{NeedsSelectorFlags, MatchingContext};
+use selectors::matching::{MatchingContext, NeedsSelectorFlags};
 use selectors::matching::{MatchingMode, VisitedHandlingMode};
 use servo_arc::Arc;
 
diff --git a/servo/components/style/stylesheets/container_rule.rs b/servo/components/style/stylesheets/container_rule.rs
index a11f2f34b263..cc86be32ae3a 100644
--- a/servo/components/style/stylesheets/container_rule.rs
+++ b/servo/components/style/stylesheets/container_rule.rs
@@ -6,29 +6,29 @@
 //!
 //! [container]: https://drafts.csswg.org/css-contain-3/#container-rule
 
-use crate::logical_geometry::{WritingMode, LogicalSize};
 use crate::dom::TElement;
+use crate::logical_geometry::{LogicalSize, WritingMode};
 use crate::media_queries::Device;
 use crate::parser::ParserContext;
-use crate::queries::{QueryCondition, FeatureType};
+use crate::properties::ComputedValues;
 use crate::queries::feature::{AllowsRanges, Evaluator, FeatureFlags, QueryFeatureDescription};
 use crate::queries::values::Orientation;
-use crate::str::CssStringWriter;
+use crate::queries::{FeatureType, QueryCondition};
 use crate::shared_lock::{
     DeepCloneParams, DeepCloneWithLock, Locked, SharedRwLock, SharedRwLockReadGuard, ToCssWithGuard,
 };
-use crate::values::specified::ContainerName;
-use crate::values::computed::{Context, CSSPixelLength, Ratio};
-use crate::properties::ComputedValues;
+use crate::str::CssStringWriter;
 use crate::stylesheets::CssRules;
+use crate::values::computed::{CSSPixelLength, Context, Ratio};
+use crate::values::specified::ContainerName;
 use app_units::Au;
-use cssparser::{SourceLocation, Parser};
+use cssparser::{Parser, SourceLocation};
 use euclid::default::Size2D;
 #[cfg(feature = "gecko")]
 use malloc_size_of::{MallocSizeOfOps, MallocUnconditionalShallowSizeOf};
 use servo_arc::Arc;
 use std::fmt::{self, Write};
-use style_traits::{CssWriter, ToCss, ParseError};
+use style_traits::{CssWriter, ParseError, ToCss};
 
 /// A container rule.
 #[derive(Debug, ToShmem)]
@@ -56,8 +56,8 @@ impl ContainerRule {
     #[cfg(feature = "gecko")]
     pub fn size_of(&self, guard: &SharedRwLockReadGuard, ops: &mut MallocSizeOfOps) -> usize {
         // Measurement of other fields may be added later.
-        self.rules.unconditional_shallow_size_of(ops)
-            + self.rules.read_with(guard).size_of(guard, ops)
+        self.rules.unconditional_shallow_size_of(ops) +
+            self.rules.read_with(guard).size_of(guard, ops)
     }
 }
 
@@ -122,12 +122,17 @@ impl ContainerCondition {
 
         // FIXME: This is a bit ambiguous:
         // https://github.com/w3c/csswg-drafts/issues/7203
-        let name = input.try_parse(|input| {
-            ContainerName::parse(context, input)
-        }).ok().unwrap_or_else(ContainerName::none);
+        let name = input
+            .try_parse(|input| ContainerName::parse(context, input))
+            .ok()
+            .unwrap_or_else(ContainerName::none);
         let condition = QueryCondition::parse(context, input, FeatureType::Container)?;
         let flags = condition.cumulative_flags();
-        Ok(Self { name, condition, flags })
+        Ok(Self {
+            name,
+            condition,
+            flags,
+        })
     }
 
     fn valid_container_info<E>(&self, potential_container: E) -> Option<ContainerLookupResult<E>>
@@ -138,7 +143,7 @@ impl ContainerCondition {
 
         fn container_type_axes(ty_: ContainerType, wm: WritingMode) -> FeatureFlags {
             if ty_.contains(ContainerType::SIZE) {
-                return FeatureFlags::all_container_axes()
+                return FeatureFlags::all_container_axes();
             }
             if ty_.contains(ContainerType::INLINE_SIZE) {
                 let physical_axis = if wm.is_vertical() {
@@ -146,7 +151,7 @@ impl ContainerCondition {
                 } else {
                     FeatureFlags::CONTAINER_REQUIRES_WIDTH_AXIS
                 };
-                return FeatureFlags::CONTAINER_REQUIRES_INLINE_AXIS | physical_axis
+                return FeatureFlags::CONTAINER_REQUIRES_INLINE_AXIS | physical_axis;
             }
             FeatureFlags::empty()
         }
@@ -211,7 +216,6 @@ impl ContainerCondition {
     }
 }
 
-
 /// Information needed to evaluate an individual container query.
 #[derive(Copy, Clone)]
 pub struct ContainerInfo {
@@ -221,7 +225,7 @@ pub struct ContainerInfo {
 
 fn get_container(context: &Context) -> ContainerInfo {
     if let Some(ref info) = context.container_info {
-        return info.clone()
+        return info.clone();
     }
     ContainerInfo {
         size: context.device().au_viewport_size(),
@@ -241,12 +245,20 @@ fn eval_height(context: &Context) -> CSSPixelLength {
 
 fn eval_inline_size(context: &Context) -> CSSPixelLength {
     let info = get_container(context);
-    CSSPixelLength::new(LogicalSize::from_physical(info.wm, info.size).inline.to_f32_px())
+    CSSPixelLength::new(
+        LogicalSize::from_physical(info.wm, info.size)
+            .inline
+            .to_f32_px(),
+    )
 }
 
 fn eval_block_size(context: &Context) -> CSSPixelLength {
     let info = get_container(context);
-    CSSPixelLength::new(LogicalSize::from_physical(info.wm, info.size).block.to_f32_px())
+    CSSPixelLength::new(
+        LogicalSize::from_physical(info.wm, info.size)
+            .block
+            .to_f32_px(),
+    )
 }
 
 fn eval_aspect_ratio(context: &Context) -> Ratio {
@@ -293,12 +305,18 @@ pub static CONTAINER_FEATURES: [QueryFeatureDescription; 6] = [
         Evaluator::NumberRatio(eval_aspect_ratio),
         // XXX from_bits_truncate is const, but the pipe operator isn't, so this
         // works around it.
-        FeatureFlags::from_bits_truncate(FeatureFlags::CONTAINER_REQUIRES_BLOCK_AXIS.bits() | FeatureFlags::CONTAINER_REQUIRES_INLINE_AXIS.bits()),
+        FeatureFlags::from_bits_truncate(
+            FeatureFlags::CONTAINER_REQUIRES_BLOCK_AXIS.bits() |
+                FeatureFlags::CONTAINER_REQUIRES_INLINE_AXIS.bits()
+        ),
     ),
     feature!(
         atom!("orientation"),
         AllowsRanges::No,
         keyword_evaluator!(eval_orientation, Orientation),
-        FeatureFlags::from_bits_truncate(FeatureFlags::CONTAINER_REQUIRES_BLOCK_AXIS.bits() | FeatureFlags::CONTAINER_REQUIRES_INLINE_AXIS.bits()),
+        FeatureFlags::from_bits_truncate(
+            FeatureFlags::CONTAINER_REQUIRES_BLOCK_AXIS.bits() |
+                FeatureFlags::CONTAINER_REQUIRES_INLINE_AXIS.bits()
+        ),
     ),
 ];
diff --git a/servo/components/style/stylesheets/mod.rs b/servo/components/style/stylesheets/mod.rs
index 95c0c6700215..9625ad62cb35 100644
--- a/servo/components/style/stylesheets/mod.rs
+++ b/servo/components/style/stylesheets/mod.rs
@@ -5,6 +5,7 @@
 //! Style sheets and their CSS rules.
 
 mod cascading_at_rule;
+pub mod container_rule;
 mod counter_style_rule;
 mod document_rule;
 mod font_face_rule;
@@ -12,7 +13,6 @@ pub mod font_feature_values_rule;
 pub mod import_rule;
 pub mod keyframes_rule;
 pub mod layer_rule;
-pub mod container_rule;
 mod loader;
 mod media_rule;
 mod namespace_rule;
@@ -45,6 +45,7 @@ use style_traits::ParsingMode;
 #[cfg(feature = "gecko")]
 use to_shmem::{self, SharedMemoryBuilder, ToShmem};
 
+pub use self::container_rule::ContainerRule;
 pub use self::counter_style_rule::CounterStyleRule;
 pub use self::document_rule::DocumentRule;
 pub use self::font_face_rule::FontFaceRule;
@@ -53,7 +54,6 @@ pub use self::import_rule::ImportRule;
 pub use self::keyframes_rule::KeyframesRule;
 pub use self::layer_rule::{LayerBlockRule, LayerStatementRule};
 pub use self::loader::StylesheetLoader;
-pub use self::container_rule::ContainerRule;
 pub use self::media_rule::MediaRule;
 pub use self::namespace_rule::NamespaceRule;
 pub use self::origin::{Origin, OriginSet, OriginSetIterator, PerOrigin, PerOriginIter};
diff --git a/servo/components/style/stylesheets/namespace_rule.rs b/servo/components/style/stylesheets/namespace_rule.rs
index c0d017ab78fb..ad980b70a8b2 100644
--- a/servo/components/style/stylesheets/namespace_rule.rs
+++ b/servo/components/style/stylesheets/namespace_rule.rs
@@ -25,7 +25,11 @@ pub struct NamespaceRule {
 
 impl ToCssWithGuard for NamespaceRule {
     // https://drafts.csswg.org/cssom/#serialize-a-css-rule CSSNamespaceRule
-    fn to_css(&self, _guard: &SharedRwLockReadGuard, dest_str: &mut CssStringWriter) -> fmt::Result {
+    fn to_css(
+        &self,
+        _guard: &SharedRwLockReadGuard,
+        dest_str: &mut CssStringWriter,
+    ) -> fmt::Result {
         let mut dest = CssWriter::new(dest_str);
         dest.write_str("@namespace ")?;
         if let Some(ref prefix) = self.prefix {
diff --git a/servo/components/style/stylesheets/page_rule.rs b/servo/components/style/stylesheets/page_rule.rs
index ee156cf989ea..5cd2458aa25b 100644
--- a/servo/components/style/stylesheets/page_rule.rs
+++ b/servo/components/style/stylesheets/page_rule.rs
@@ -12,12 +12,12 @@ use crate::shared_lock::{DeepCloneParams, DeepCloneWithLock, Locked};
 use crate::shared_lock::{SharedRwLock, SharedRwLockReadGuard, ToCssWithGuard};
 use crate::str::CssStringWriter;
 use crate::values::{AtomIdent, CustomIdent};
-use style_traits::{CssWriter, ParseError, ToCss};
 use cssparser::{Parser, SourceLocation};
 #[cfg(feature = "gecko")]
 use malloc_size_of::{MallocSizeOf, MallocSizeOfOps, MallocUnconditionalShallowSizeOf};
 use servo_arc::Arc;
 use std::fmt::{self, Write};
+use style_traits::{CssWriter, ParseError, ToCss};
 
 /// Type of a single [`@page`][page selector]
 ///
@@ -32,7 +32,7 @@ impl PageSelector {
     /// This does not currently take pseudo selectors into account.
     #[inline]
     pub fn ident_matches(&self, other: &CustomIdent) -> bool {
-        self.0.0 == other.0
+        self.0 .0 == other.0
     }
 }
 
@@ -76,7 +76,9 @@ impl Parse for PageSelectors {
         context: &ParserContext,
         input: &mut Parser<'i, 't>,
     ) -> Result<Self, ParseError<'i>> {
-        Ok(PageSelectors::new(input.parse_comma_separated(|i| PageSelector::parse(context, i))?))
+        Ok(PageSelectors::new(input.parse_comma_separated(|i| {
+            PageSelector::parse(context, i)
+        })?))
     }
 }
 
@@ -102,7 +104,9 @@ impl PageRule {
     #[cfg(feature = "gecko")]
     pub fn size_of(&self, guard: &SharedRwLockReadGuard, ops: &mut MallocSizeOfOps) -> usize {
         // Measurement of other fields may be added later.
-        self.block.unconditional_shallow_size_of(ops) + self.block.read_with(guard).size_of(ops) + self.selectors.size_of(ops)
+        self.block.unconditional_shallow_size_of(ops) +
+            self.block.read_with(guard).size_of(ops) +
+            self.selectors.size_of(ops)
     }
 }
 
diff --git a/servo/components/style/stylesheets/rule_parser.rs b/servo/components/style/stylesheets/rule_parser.rs
index ea69896a8cea..93929a26aab3 100644
--- a/servo/components/style/stylesheets/rule_parser.rs
+++ b/servo/components/style/stylesheets/rule_parser.rs
@@ -13,7 +13,7 @@ use crate::properties::parse_property_declaration_list;
 use crate::selector_parser::{SelectorImpl, SelectorParser};
 use crate::shared_lock::{Locked, SharedRwLock};
 use crate::str::starts_with_ignore_ascii_case;
-use crate::stylesheets::container_rule::{ContainerRule, ContainerCondition};
+use crate::stylesheets::container_rule::{ContainerCondition, ContainerRule};
 use crate::stylesheets::document_rule::DocumentCondition;
 use crate::stylesheets::font_feature_values_rule::parse_family_name_list;
 use crate::stylesheets::import_rule::ImportLayer;
@@ -69,7 +69,7 @@ impl<'a> InsertRuleContext<'a> {
                     }
                 }
                 State::Body
-            }
+            },
             _ => State::Body,
         }
     }
@@ -648,15 +648,13 @@ impl<'a, 'b, 'i> AtRuleParser<'i> for NestedRuleParser<'a, 'b> {
                     },
                 ))))
             },
-            AtRulePrelude::Container(condition) => {
-                Ok(CssRule::Container(Arc::new(self.shared_lock.wrap(
-                    ContainerRule {
-                        condition,
-                        rules: self.parse_nested_rules(input, CssRuleType::Container),
-                        source_location: start.source_location(),
-                    },
-                ))))
-            },
+            AtRulePrelude::Container(condition) => Ok(CssRule::Container(Arc::new(
+                self.shared_lock.wrap(ContainerRule {
+                    condition,
+                    rules: self.parse_nested_rules(input, CssRuleType::Container),
+                    source_location: start.source_location(),
+                }),
+            ))),
             AtRulePrelude::Layer(names) => {
                 let name = match names.len() {
                     0 | 1 => names.into_iter().next(),
diff --git a/servo/components/style/stylesheets/supports_rule.rs b/servo/components/style/stylesheets/supports_rule.rs
index a3e601652bbb..14b9afa18ece 100644
--- a/servo/components/style/stylesheets/supports_rule.rs
+++ b/servo/components/style/stylesheets/supports_rule.rs
@@ -4,6 +4,7 @@
 
 //! [@supports rules](https://drafts.csswg.org/css-conditional-3/#at-supports)
 
+use crate::font_face::{FontFaceSourceFormatKeyword, FontFaceSourceTechFlags};
 use crate::parser::ParserContext;
 use crate::properties::{PropertyDeclaration, PropertyId, SourcePropertyDeclaration};
 use crate::selector_parser::{SelectorImpl, SelectorParser};
@@ -11,7 +12,6 @@ use crate::shared_lock::{DeepCloneParams, DeepCloneWithLock, Locked};
 use crate::shared_lock::{SharedRwLock, SharedRwLockReadGuard, ToCssWithGuard};
 use crate::str::CssStringWriter;
 use crate::stylesheets::{CssRuleType, CssRules, Namespaces};
-use crate::font_face::{FontFaceSourceFormatKeyword, FontFaceSourceTechFlags};
 use cssparser::parse_important;
 use cssparser::{Delimiter, Parser, SourceLocation, Token};
 use cssparser::{ParseError as CssParseError, ParserInput};
diff --git a/servo/components/style/stylist.rs b/servo/components/style/stylist.rs
index 4868ed3a7d66..ef6ab7acb581 100644
--- a/servo/components/style/stylist.rs
+++ b/servo/components/style/stylist.rs
@@ -866,12 +866,7 @@ impl Stylist {
 
         let rule_node = self.rule_node_for_precomputed_pseudo(guards, pseudo, vec![]);
 
-        self.precomputed_values_for_pseudo_with_rule_node::<E>(
-            guards,
-            pseudo,
-            parent,
-            rule_node,
-        )
+        self.precomputed_values_for_pseudo_with_rule_node::<E>(guards, pseudo, parent, rule_node)
     }
 
     /// Computes the style for a given "precomputed" pseudo-element with
@@ -951,11 +946,7 @@ impl Stylist {
     where
         E: TElement,
     {
-        self.precomputed_values_for_pseudo::<E>(
-            guards,
-            &pseudo,
-            Some(parent_style),
-        )
+        self.precomputed_values_for_pseudo::<E>(guards, &pseudo, Some(parent_style))
     }
 
     /// Computes a pseudo-element style lazily during layout.
@@ -1644,8 +1635,7 @@ pub struct PageRuleData {
 /// named page rules that match a certain page.
 #[derive(Clone, Debug, Deref, MallocSizeOf)]
 pub struct PageRuleDataNoLayer(
-    #[ignore_malloc_size_of = "Arc, stylesheet measures as primary ref"]
-    pub Arc<Locked<PageRule>>,
+    #[ignore_malloc_size_of = "Arc, stylesheet measures as primary ref"] pub Arc<Locked<PageRule>>,
 );
 
 /// Stores page rules indexed by page names.
@@ -1729,14 +1719,19 @@ impl ExtraStyleData {
     ) -> Result<(), AllocErr> {
         let page_rule = rule.read_with(guard);
         if page_rule.selectors.0.is_empty() {
-            self.pages.global.push(PageRuleDataNoLayer(rule.clone()), layer);
+            self.pages
+                .global
+                .push(PageRuleDataNoLayer(rule.clone()), layer);
         } else {
             // TODO: Handle pseudo-classes
             self.pages.named.try_reserve(page_rule.selectors.0.len())?;
             for name in page_rule.selectors.as_slice() {
-                let vec = self.pages.named.entry(name.0.0.clone()).or_default();
+                let vec = self.pages.named.entry(name.0 .0.clone()).or_default();
                 vec.try_reserve(1)?;
-                vec.push(PageRuleData{layer, rule: rule.clone()});
+                vec.push(PageRuleData {
+                    layer,
+                    rule: rule.clone(),
+                });
             }
         }
         Ok(())
@@ -2095,7 +2090,6 @@ impl ContainerConditionId {
     }
 }
 
-
 #[derive(Clone, Debug, MallocSizeOf)]
 struct ContainerConditionReference {
     parent: ContainerConditionId,
@@ -2343,7 +2337,12 @@ impl CascadeData {
         self.layers[id.0 as usize].order
     }
 
-    pub(crate) fn container_condition_matches<E>(&self, mut id: ContainerConditionId, stylist: &Stylist, element: E) -> bool
+    pub(crate) fn container_condition_matches<E>(
+        &self,
+        mut id: ContainerConditionId,
+        stylist: &Stylist,
+        element: E,
+    ) -> bool
     where
         E: TElement,
     {
@@ -2378,7 +2377,6 @@ impl CascadeData {
         self.mapped_ids.shrink_if_needed();
         self.layer_id.shrink_if_needed();
         self.selectors_for_cache_revalidation.shrink_if_needed();
-
     }
 
     fn compute_layer_order(&mut self) {
@@ -2623,7 +2621,8 @@ impl CascadeData {
                     //
                     // https://drafts.csswg.org/css-contain-3/#container-rule
                     // (Same elsewhere)
-                    self.extra_data.add_font_face(rule, containing_rule_state.layer_id);
+                    self.extra_data
+                        .add_font_face(rule, containing_rule_state.layer_id);
                 },
                 #[cfg(feature = "gecko")]
                 CssRule::FontFeatureValues(ref rule) => {
@@ -2632,12 +2631,16 @@ impl CascadeData {
                 },
                 #[cfg(feature = "gecko")]
                 CssRule::CounterStyle(ref rule) => {
-                    self.extra_data
-                        .add_counter_style(guard, rule, containing_rule_state.layer_id)?;
+                    self.extra_data.add_counter_style(
+                        guard,
+                        rule,
+                        containing_rule_state.layer_id,
+                    )?;
                 },
                 #[cfg(feature = "gecko")]
                 CssRule::Page(ref rule) => {
-                    self.extra_data.add_page(guard, rule, containing_rule_state.layer_id)?;
+                    self.extra_data
+                        .add_page(guard, rule, containing_rule_state.layer_id)?;
                 },
                 CssRule::Viewport(..) => {},
                 _ => {
@@ -2721,7 +2724,8 @@ impl CascadeData {
                 };
                 for name in name.layer_names() {
                     containing_rule_state.layer_name.0.push(name.clone());
-                    containing_rule_state.layer_id = maybe_register_layer(data, &containing_rule_state.layer_name);
+                    containing_rule_state.layer_id =
+                        maybe_register_layer(data, &containing_rule_state.layer_name);
                 }
                 debug_assert_ne!(containing_rule_state.layer_id, LayerId::root());
             }
@@ -2735,11 +2739,7 @@ impl CascadeData {
                             .saw_effective(import_rule);
                     }
                     if let Some(ref layer) = import_rule.layer {
-                        maybe_register_layers(
-                            self,
-                            layer.name.as_ref(),
-                            containing_rule_state
-                        );
+                        maybe_register_layers(self, layer.name.as_ref(), containing_rule_state);
                     }
                 },
                 CssRule::Media(ref lock) => {
@@ -2750,11 +2750,7 @@ impl CascadeData {
                 },
                 CssRule::LayerBlock(ref lock) => {
                     let layer_rule = lock.read_with(guard);
-                    maybe_register_layers(
-                        self,
-                        layer_rule.name.as_ref(),
-                        containing_rule_state,
-                    );
+                    maybe_register_layers(self, layer_rule.name.as_ref(), containing_rule_state);
                 },
                 CssRule::LayerStatement(ref lock) => {
                     let layer_rule = lock.read_with(guard);
@@ -2953,7 +2949,8 @@ impl CascadeData {
         self.layers.clear();
         self.layers.push(CascadeLayer::root());
         self.container_conditions.clear();
-        self.container_conditions.push(ContainerConditionReference::none());
+        self.container_conditions
+            .push(ContainerConditionReference::none());
         self.extra_data.clear();
         self.rules_source_order = 0;
         self.num_selectors = 0;
diff --git a/servo/components/style/traversal.rs b/servo/components/style/traversal.rs
index 6c905d6f7e05..c50b2850caa6 100644
--- a/servo/components/style/traversal.rs
+++ b/servo/components/style/traversal.rs
@@ -19,10 +19,8 @@ use smallvec::SmallVec;
 use std::collections::HashMap;
 
 /// A cache from element reference to known-valid computed style.
-pub type UndisplayedStyleCache = HashMap<
-    selectors::OpaqueElement,
-    servo_arc::Arc<crate::properties::ComputedValues>,
->;
+pub type UndisplayedStyleCache =
+    HashMap<selectors::OpaqueElement, servo_arc::Arc<crate::properties::ComputedValues>>;
 
 /// A per-traversal-level chunk of data. This is sent down by the traversal, and
 /// currently only holds the dom depth for the bloom filter.
@@ -336,9 +334,8 @@ where
         }
 
         ancestor = ancestor.unwrap().traversal_parent();
-        layout_parent_style = ancestor.and_then(|a| {
-            a.borrow_data().map(|data| data.styles.primary().clone())
-        });
+        layout_parent_style =
+            ancestor.and_then(|a| a.borrow_data().map(|data| data.styles.primary().clone()));
     }
 
     for ancestor in ancestors_requiring_style_resolution.iter().rev() {
@@ -792,7 +789,7 @@ fn note_children<E, D, F>(
                 },
                 ChildRestyleRequirement::MustMatchDescendants => {
                     child_hint |= RestyleHint::restyle_subtree();
-                }
+                },
             }
 
             child_data.hint.insert(child_hint);
diff --git a/servo/components/style/values/animated/color.rs b/servo/components/style/values/animated/color.rs
index e79961661b91..ac3a2ad2d3ef 100644
--- a/servo/components/style/values/animated/color.rs
+++ b/servo/components/style/values/animated/color.rs
@@ -8,7 +8,7 @@ use crate::values::animated::{Animate, Procedure, ToAnimatedZero};
 use crate::values::computed::Percentage;
 use crate::values::distance::{ComputeSquaredDistance, SquaredDistance};
 use crate::values::generics::color::{
-    GenericColor, GenericColorMix, ColorInterpolationMethod, ColorSpace, HueInterpolationMethod,
+    ColorInterpolationMethod, ColorSpace, GenericColor, GenericColorMix, HueInterpolationMethod,
 };
 use euclid::default::{Transform3D, Vector3D};
 use std::f32::consts::PI;
@@ -162,13 +162,7 @@ impl Color {
         let left = S::from(*left_color);
         let right = S::from(*right_color);
 
-        let color = S::lerp(
-            &left,
-            left_weight,
-            &right,
-            right_weight,
-            hue_interpolation,
-        );
+        let color = S::lerp(&left, left_weight, &right, right_weight, hue_interpolation);
         let mut rgba = RGBA::from(color.into());
         if alpha_multiplier != 1.0 {
             rgba.alpha *= alpha_multiplier;
diff --git a/servo/components/style/values/animated/transform.rs b/servo/components/style/values/animated/transform.rs
index 8600281ce5b0..bb1b4e910cb9 100644
--- a/servo/components/style/values/animated/transform.rs
+++ b/servo/components/style/values/animated/transform.rs
@@ -892,7 +892,11 @@ impl Animate for ComputedTransform {
             // If there is a remainder from *both* lists we must have had mismatched functions.
             // => Add the remainders to a suitable ___Matrix function.
             (Some(this_remainder), Some(other_remainder)) => {
-                result.push(TransformOperation::animate_mismatched_transforms(this_remainder, other_remainder, procedure)?);
+                result.push(TransformOperation::animate_mismatched_transforms(
+                    this_remainder,
+                    other_remainder,
+                    procedure,
+                )?);
             },
             // If there is a remainder from just one list, then one list must be shorter but
             // completely match the type of the corresponding functions in the longer list.
@@ -1121,7 +1125,10 @@ impl ComputedTransformOperation {
     ) -> Result<Self, ()> {
         let (left, _left_3d) = Transform::components_to_transform_3d_matrix(left, None)?;
         let (right, _right_3d) = Transform::components_to_transform_3d_matrix(right, None)?;
-        ComputedTransformOperation::Matrix3D(left.into()).animate(&ComputedTransformOperation::Matrix3D(right.into()), procedure)
+        ComputedTransformOperation::Matrix3D(left.into()).animate(
+            &ComputedTransformOperation::Matrix3D(right.into()),
+            procedure,
+        )
     }
 
     fn animate_mismatched_transforms(
@@ -1137,22 +1144,18 @@ impl ComputedTransformOperation {
         Ok(match procedure {
             Procedure::Add => {
                 debug_assert!(false, "Addition should've been handled earlier");
-                return Err(())
+                return Err(());
+            },
+            Procedure::Interpolate { progress } => Self::InterpolateMatrix {
+                from_list,
+                to_list,
+                progress: Percentage(progress as f32),
+            },
+            Procedure::Accumulate { count } => Self::AccumulateMatrix {
+                from_list,
+                to_list,
+                count: cmp::min(count, i32::max_value() as u64) as i32,
             },
-            Procedure::Interpolate { progress } => {
-                Self::InterpolateMatrix {
-                    from_list,
-                    to_list,
-                    progress: Percentage(progress as f32),
-                }
-            }
-            Procedure::Accumulate { count } => {
-                Self::AccumulateMatrix {
-                    from_list,
-                    to_list,
-                    count: cmp::min(count, i32::max_value() as u64) as i32,
-                }
-            }
         })
     }
 }
diff --git a/servo/components/style/values/computed/box.rs b/servo/components/style/values/computed/box.rs
index 2758289295be..67b06ac56149 100644
--- a/servo/components/style/values/computed/box.rs
+++ b/servo/components/style/values/computed/box.rs
@@ -8,7 +8,9 @@ use crate::values::animated::{Animate, Procedure};
 use crate::values::computed::length::{LengthPercentage, NonNegativeLength};
 use crate::values::computed::{Context, Integer, Number, ToComputedValue};
 use crate::values::generics::box_::AnimationIterationCount as GenericAnimationIterationCount;
-use crate::values::generics::box_::{GenericLineClamp, GenericPerspective, GenericVerticalAlign, GenericContainIntrinsicSize};
+use crate::values::generics::box_::{
+    GenericContainIntrinsicSize, GenericLineClamp, GenericPerspective, GenericVerticalAlign,
+};
 use crate::values::specified::box_ as specified;
 
 pub use crate::values::specified::box_::{
@@ -39,7 +41,7 @@ impl Animate for LineClamp {
             return Err(());
         }
         if self.is_none() {
-            return Ok(Self::none())
+            return Ok(Self::none());
         }
         Ok(Self(self.0.animate(&other.0, procedure)?.max(1)))
     }
diff --git a/servo/components/style/values/computed/color.rs b/servo/components/style/values/computed/color.rs
index 1229793c7143..dd15ec41d3df 100644
--- a/servo/components/style/values/computed/color.rs
+++ b/servo/components/style/values/computed/color.rs
@@ -6,8 +6,8 @@
 
 use crate::values::animated::color::AnimatedRGBA;
 use crate::values::animated::ToAnimatedValue;
-use crate::values::generics::color::{GenericCaretColor, GenericColor, GenericColorOrAuto};
 use crate::values::computed::percentage::Percentage;
+use crate::values::generics::color::{GenericCaretColor, GenericColor, GenericColorOrAuto};
 use cssparser::{Color as CSSParserColor, RGBA};
 use std::fmt;
 use style_traits::{CssWriter, ToCss};
diff --git a/servo/components/style/values/computed/font.rs b/servo/components/style/values/computed/font.rs
index 466af6aef13b..9a0c8dcb2237 100644
--- a/servo/components/style/values/computed/font.rs
+++ b/servo/components/style/values/computed/font.rs
@@ -7,8 +7,8 @@
 use crate::parser::{Parse, ParserContext};
 use crate::values::animated::ToAnimatedValue;
 use crate::values::computed::{
-    Angle, Context, Integer, Length, NonNegativeLength, NonNegativeNumber,
-    Number, Percentage, ToComputedValue
+    Angle, Context, Integer, Length, NonNegativeLength, NonNegativeNumber, Number, Percentage,
+    ToComputedValue,
 };
 use crate::values::generics::font::{FeatureTagValue, FontSettings, VariationValue};
 use crate::values::generics::{font as generics, NonNegative};
@@ -48,7 +48,15 @@ pub use crate::values::specified::Integer as SpecifiedInteger;
 /// cbindgen:derive-gte
 #[repr(C)]
 #[derive(
-    Clone, ComputeSquaredDistance, Copy, Debug, Hash, MallocSizeOf, PartialEq, PartialOrd, ToResolvedValue,
+    Clone,
+    ComputeSquaredDistance,
+    Copy,
+    Debug,
+    Hash,
+    MallocSizeOf,
+    PartialEq,
+    PartialOrd,
+    ToResolvedValue,
 )]
 pub struct FixedPoint<T, const FRACTION_BITS: u16> {
     value: T,
@@ -95,7 +103,15 @@ pub type FontWeightFixedPoint = FixedPoint<u16, FONT_WEIGHT_FRACTION_BITS>;
 /// cbindgen:derive-gt
 /// cbindgen:derive-gte
 #[derive(
-    Clone, ComputeSquaredDistance, Copy, Debug, Hash, MallocSizeOf, PartialEq, PartialOrd, ToResolvedValue,
+    Clone,
+    ComputeSquaredDistance,
+    Copy,
+    Debug,
+    Hash,
+    MallocSizeOf,
+    PartialEq,
+    PartialOrd,
+    ToResolvedValue,
 )]
 #[cfg_attr(feature = "servo", derive(Deserialize, Serialize))]
 #[repr(C)]
@@ -125,13 +141,19 @@ impl ToCss for FontWeight {
 
 impl FontWeight {
     /// The `normal` keyword.
-    pub const NORMAL: FontWeight = FontWeight(FontWeightFixedPoint { value: 400 << FONT_WEIGHT_FRACTION_BITS });
+    pub const NORMAL: FontWeight = FontWeight(FontWeightFixedPoint {
+        value: 400 << FONT_WEIGHT_FRACTION_BITS,
+    });
 
     /// The `bold` value.
-    pub const BOLD: FontWeight = FontWeight(FontWeightFixedPoint { value: 700 << FONT_WEIGHT_FRACTION_BITS });
+    pub const BOLD: FontWeight = FontWeight(FontWeightFixedPoint {
+        value: 700 << FONT_WEIGHT_FRACTION_BITS,
+    });
 
     /// The threshold from which we consider a font bold.
-    pub const BOLD_THRESHOLD: FontWeight = FontWeight(FontWeightFixedPoint { value: 600 << FONT_WEIGHT_FRACTION_BITS });
+    pub const BOLD_THRESHOLD: FontWeight = FontWeight(FontWeightFixedPoint {
+        value: 600 << FONT_WEIGHT_FRACTION_BITS,
+    });
 
     /// Returns the `normal` keyword value.
     pub fn normal() -> Self {
@@ -150,7 +172,9 @@ impl FontWeight {
 
     /// Construct a valid weight from a float value.
     pub fn from_float(v: f32) -> Self {
-        Self(FixedPoint::from_float(v.max(MIN_FONT_WEIGHT).min(MAX_FONT_WEIGHT)))
+        Self(FixedPoint::from_float(
+            v.max(MIN_FONT_WEIGHT).min(MAX_FONT_WEIGHT),
+        ))
     }
 
     /// Return the bolder weight.
@@ -175,7 +199,7 @@ impl FontWeight {
     pub fn lighter(self) -> Self {
         let value = self.value();
         if value < 550. {
-            return Self::from_float(value.min(100.))
+            return Self::from_float(value.min(100.));
         }
         if value < 750. {
             return Self::NORMAL;
@@ -860,23 +884,37 @@ pub type FontStyleFixedPoint = FixedPoint<i16, FONT_STYLE_FRACTION_BITS>;
 /// cbindgen:derive-gt
 /// cbindgen:derive-gte
 #[derive(
-    Clone, ComputeSquaredDistance, Copy, Debug, Hash, MallocSizeOf, PartialEq, PartialOrd, ToResolvedValue,
+    Clone,
+    ComputeSquaredDistance,
+    Copy,
+    Debug,
+    Hash,
+    MallocSizeOf,
+    PartialEq,
+    PartialOrd,
+    ToResolvedValue,
 )]
 #[repr(C)]
 pub struct FontStyle(FontStyleFixedPoint);
 
 impl FontStyle {
     /// The normal keyword.
-    pub const NORMAL: FontStyle = FontStyle(FontStyleFixedPoint { value: 100 << FONT_STYLE_FRACTION_BITS });
+    pub const NORMAL: FontStyle = FontStyle(FontStyleFixedPoint {
+        value: 100 << FONT_STYLE_FRACTION_BITS,
+    });
     /// The italic keyword.
-    pub const ITALIC: FontStyle = FontStyle(FontStyleFixedPoint { value: 101 << FONT_STYLE_FRACTION_BITS });
+    pub const ITALIC: FontStyle = FontStyle(FontStyleFixedPoint {
+        value: 101 << FONT_STYLE_FRACTION_BITS,
+    });
 
     /// The default angle for `font-style: oblique`.
     /// See also https://github.com/w3c/csswg-drafts/issues/2295
     pub const DEFAULT_OBLIQUE_DEGREES: i16 = 14;
 
     /// The `oblique` keyword with the default degrees.
-    pub const OBLIQUE: FontStyle = FontStyle(FontStyleFixedPoint { value: Self::DEFAULT_OBLIQUE_DEGREES << FONT_STYLE_FRACTION_BITS });
+    pub const OBLIQUE: FontStyle = FontStyle(FontStyleFixedPoint {
+        value: Self::DEFAULT_OBLIQUE_DEGREES << FONT_STYLE_FRACTION_BITS,
+    });
 
     /// The `normal` value.
     #[inline]
@@ -889,7 +927,7 @@ impl FontStyle {
         Self(FixedPoint::from_float(
             degrees
                 .max(specified::FONT_STYLE_OBLIQUE_MIN_ANGLE_DEGREES)
-                .min(specified::FONT_STYLE_OBLIQUE_MAX_ANGLE_DEGREES)
+                .min(specified::FONT_STYLE_OBLIQUE_MAX_ANGLE_DEGREES),
         ))
     }
 
@@ -907,10 +945,10 @@ impl ToCss for FontStyle {
         W: fmt::Write,
     {
         if *self == Self::NORMAL {
-            return dest.write_str("normal")
+            return dest.write_str("normal");
         }
         if *self == Self::ITALIC {
-            return dest.write_str("italic")
+            return dest.write_str("italic");
         }
         if *self == Self::OBLIQUE {
             return dest.write_str("oblique");
@@ -928,10 +966,10 @@ impl ToAnimatedValue for FontStyle {
     #[inline]
     fn to_animated_value(self) -> Self::AnimatedValue {
         if self == Self::NORMAL {
-            return generics::FontStyle::Normal
+            return generics::FontStyle::Normal;
         }
         if self == Self::ITALIC {
-            return generics::FontStyle::Italic
+            return generics::FontStyle::Italic;
         }
         generics::FontStyle::Oblique(Angle::from_degrees(self.oblique_degrees()))
     }
@@ -946,7 +984,6 @@ impl ToAnimatedValue for FontStyle {
     }
 }
 
-
 /// font-stretch is a percentage relative to normal.
 ///
 /// We use an unsigned 10.6 fixed-point value (range 0.0 - 1023.984375)
@@ -959,7 +996,6 @@ pub const FONT_STRETCH_FRACTION_BITS: u16 = 6;
 /// workaround.
 pub type FontStretchFixedPoint = FixedPoint<u16, FONT_STRETCH_FRACTION_BITS>;
 
-
 /// A value for the font-stretch property per:
 ///
 /// https://drafts.csswg.org/css-fonts-4/#propdef-font-stretch
@@ -981,23 +1017,41 @@ impl FontStretch {
     pub const HALF: u16 = 1 << (Self::FRACTION_BITS - 1);
 
     /// The `ultra-condensed` keyword.
-    pub const ULTRA_CONDENSED: FontStretch = FontStretch(FontStretchFixedPoint { value: 50 << Self::FRACTION_BITS });
+    pub const ULTRA_CONDENSED: FontStretch = FontStretch(FontStretchFixedPoint {
+        value: 50 << Self::FRACTION_BITS,
+    });
     /// The `extra-condensed` keyword.
-    pub const EXTRA_CONDENSED: FontStretch = FontStretch(FontStretchFixedPoint { value: (62 << Self::FRACTION_BITS) + Self::HALF });
+    pub const EXTRA_CONDENSED: FontStretch = FontStretch(FontStretchFixedPoint {
+        value: (62 << Self::FRACTION_BITS) + Self::HALF,
+    });
     /// The `condensed` keyword.
-    pub const CONDENSED: FontStretch = FontStretch(FontStretchFixedPoint { value: 75 << Self::FRACTION_BITS });
+    pub const CONDENSED: FontStretch = FontStretch(FontStretchFixedPoint {
+        value: 75 << Self::FRACTION_BITS,
+    });
     /// The `semi-condensed` keyword.
-    pub const SEMI_CONDENSED: FontStretch = FontStretch(FontStretchFixedPoint { value: (87 << Self::FRACTION_BITS) + Self::HALF });
+    pub const SEMI_CONDENSED: FontStretch = FontStretch(FontStretchFixedPoint {
+        value: (87 << Self::FRACTION_BITS) + Self::HALF,
+    });
     /// The `normal` keyword.
-    pub const NORMAL: FontStretch = FontStretch(FontStretchFixedPoint { value: 100 << Self::FRACTION_BITS });
+    pub const NORMAL: FontStretch = FontStretch(FontStretchFixedPoint {
+        value: 100 << Self::FRACTION_BITS,
+    });
     /// The `semi-expanded` keyword.
-    pub const SEMI_EXPANDED: FontStretch = FontStretch(FontStretchFixedPoint { value: (112 << Self::FRACTION_BITS) + Self::HALF });
+    pub const SEMI_EXPANDED: FontStretch = FontStretch(FontStretchFixedPoint {
+        value: (112 << Self::FRACTION_BITS) + Self::HALF,
+    });
     /// The `expanded` keyword.
-    pub const EXPANDED: FontStretch = FontStretch(FontStretchFixedPoint { value: 125 << Self::FRACTION_BITS });
+    pub const EXPANDED: FontStretch = FontStretch(FontStretchFixedPoint {
+        value: 125 << Self::FRACTION_BITS,
+    });
     /// The `extra-expanded` keyword.
-    pub const EXTRA_EXPANDED: FontStretch = FontStretch(FontStretchFixedPoint { value: 150 << Self::FRACTION_BITS });
+    pub const EXTRA_EXPANDED: FontStretch = FontStretch(FontStretchFixedPoint {
+        value: 150 << Self::FRACTION_BITS,
+    });
     /// The `ultra-expanded` keyword.
-    pub const ULTRA_EXPANDED: FontStretch = FontStretch(FontStretchFixedPoint { value: 200 << Self::FRACTION_BITS });
+    pub const ULTRA_EXPANDED: FontStretch = FontStretch(FontStretchFixedPoint {
+        value: 200 << Self::FRACTION_BITS,
+    });
 
     /// 100%
     pub fn hundred() -> Self {
diff --git a/servo/components/style/values/computed/length.rs b/servo/components/style/values/computed/length.rs
index 1da8f31f0552..75e6f355353c 100644
--- a/servo/components/style/values/computed/length.rs
+++ b/servo/components/style/values/computed/length.rs
@@ -42,7 +42,11 @@ impl ToComputedValue for specified::NoCalcLength {
 
 impl specified::NoCalcLength {
     /// Computes a length with a given font-relative base size.
-    pub fn to_computed_value_with_base_size(&self, context: &Context, base_size: FontBaseSize) -> Length {
+    pub fn to_computed_value_with_base_size(
+        &self,
+        context: &Context,
+        base_size: FontBaseSize,
+    ) -> Length {
         match *self {
             specified::NoCalcLength::Absolute(length) => length.to_computed_value(context),
             specified::NoCalcLength::FontRelative(length) => {
diff --git a/servo/components/style/values/computed/length_percentage.rs b/servo/components/style/values/computed/length_percentage.rs
index bf049fe202dc..21e0a4b0cfb4 100644
--- a/servo/components/style/values/computed/length_percentage.rs
+++ b/servo/components/style/values/computed/length_percentage.rs
@@ -762,11 +762,7 @@ impl specified::CalcLengthPercentage {
         context: &Context,
         base_size: FontBaseSize,
     ) -> LengthPercentage {
-        self.to_computed_value_with_zoom(
-            context,
-            |abs| context.maybe_zoom_text(abs),
-            base_size,
-        )
+        self.to_computed_value_with_zoom(context, |abs| context.maybe_zoom_text(abs), base_size)
     }
 
     /// Compute the value into pixel length as CSSFloat without context,
diff --git a/servo/components/style/values/computed/mod.rs b/servo/components/style/values/computed/mod.rs
index 26bedbed8955..729f535b79fd 100644
--- a/servo/components/style/values/computed/mod.rs
+++ b/servo/components/style/values/computed/mod.rs
@@ -16,13 +16,13 @@ use super::specified;
 use super::{CSSFloat, CSSInteger};
 use crate::computed_value_flags::ComputedValueFlags;
 use crate::context::QuirksMode;
-use crate::stylesheets::container_rule::ContainerInfo;
 use crate::font_metrics::{FontMetrics, FontMetricsOrientation};
 use crate::media_queries::Device;
 #[cfg(feature = "gecko")]
 use crate::properties;
 use crate::properties::{ComputedValues, LonghandId, StyleBuilder};
 use crate::rule_cache::RuleCacheConditions;
+use crate::stylesheets::container_rule::ContainerInfo;
 use crate::values::specified::length::FontBaseSize;
 use crate::{ArcSlice, Atom, One};
 use euclid::{default, Point2D, Rect, Size2D};
@@ -45,8 +45,13 @@ pub use self::basic_shape::FillRule;
 pub use self::border::{BorderCornerRadius, BorderRadius, BorderSpacing};
 pub use self::border::{BorderImageRepeat, BorderImageSideWidth};
 pub use self::border::{BorderImageSlice, BorderImageWidth};
-pub use self::box_::{AnimationIterationCount, AnimationName, AnimationTimeline, Contain, ContainerName, ContainerType};
-pub use self::box_::{Appearance, BreakBetween, BreakWithin, Clear, ContentVisibility, ContainIntrinsicSize, Float};
+pub use self::box_::{
+    AnimationIterationCount, AnimationName, AnimationTimeline, Contain, ContainerName,
+    ContainerType,
+};
+pub use self::box_::{
+    Appearance, BreakBetween, BreakWithin, Clear, ContainIntrinsicSize, ContentVisibility, Float,
+};
 pub use self::box_::{Display, LineClamp, Overflow, OverflowAnchor, TransitionProperty};
 pub use self::box_::{OverflowClipBox, OverscrollBehavior, Perspective, Resize, ScrollbarGutter};
 pub use self::box_::{ScrollAxis, ScrollSnapAlign, ScrollSnapAxis, ScrollSnapStop};
@@ -74,7 +79,7 @@ pub use self::list::ListStyleType;
 pub use self::list::Quotes;
 pub use self::motion::{OffsetPath, OffsetRotate};
 pub use self::outline::OutlineStyle;
-pub use self::page::{PageOrientation, PageName, PageSize, PaperSize};
+pub use self::page::{PageName, PageOrientation, PageSize, PaperSize};
 pub use self::percentage::{NonNegativePercentage, Percentage};
 pub use self::position::AspectRatio;
 pub use self::position::{
@@ -97,7 +102,7 @@ pub use self::transform::{Rotate, Scale, Transform, TransformOperation};
 pub use self::transform::{TransformOrigin, TransformStyle, Translate};
 #[cfg(feature = "gecko")]
 pub use self::ui::CursorImage;
-pub use self::ui::{Cursor, BoolInteger, UserSelect};
+pub use self::ui::{BoolInteger, Cursor, UserSelect};
 pub use super::specified::TextTransform;
 pub use super::specified::ViewportVariant;
 pub use super::specified::{BorderStyle, TextDecorationLine};
@@ -285,7 +290,7 @@ impl<'a> Context<'a> {
             font,
             size,
             self.in_media_query,
-            retrieve_math_scales
+            retrieve_math_scales,
         )
     }
 
@@ -339,10 +344,7 @@ pub struct ComputedVecIter<'a, 'cx, 'cx_a: 'cx, S: ToComputedValue + 'a> {
 impl<'a, 'cx, 'cx_a: 'cx, S: ToComputedValue + 'a> ComputedVecIter<'a, 'cx, 'cx_a, S> {
     /// Construct an iterator from a slice of specified values and a context
     pub fn new(cx: &'cx Context<'cx_a>, values: &'a [S]) -> Self {
-        ComputedVecIter {
-            cx,
-            values,
-        }
+        ComputedVecIter { cx, values }
     }
 }
 
diff --git a/servo/components/style/values/generics/box.rs b/servo/components/style/values/generics/box.rs
index b8ade8a467ad..1885017cc229 100644
--- a/servo/components/style/values/generics/box.rs
+++ b/servo/components/style/values/generics/box.rs
@@ -117,7 +117,7 @@ impl<L: ToCss> ToCss for ContainIntrinsicSize<L> {
             Self::AutoLength(ref l) => {
                 dest.write_str("auto ")?;
                 l.to_css(dest)
-            }
+            },
         }
     }
 }
diff --git a/servo/components/style/values/generics/color.rs b/servo/components/style/values/generics/color.rs
index 65acfee9061a..6c82cbf2aedc 100644
--- a/servo/components/style/values/generics/color.rs
+++ b/servo/components/style/values/generics/color.rs
@@ -4,12 +4,12 @@
 
 //! Generic types for color properties.
 
+use crate::values::animated::color::AnimatedRGBA;
+use crate::values::animated::ToAnimatedValue;
+use crate::values::specified::percentage::ToPercentage;
+use crate::values::{Parse, Parser, ParserContext};
 use std::fmt::{self, Write};
 use style_traits::{CssWriter, ParseError, ToCss};
-use crate::values::{Parse, ParserContext, Parser};
-use crate::values::specified::percentage::ToPercentage;
-use crate::values::animated::ToAnimatedValue;
-use crate::values::animated::color::AnimatedRGBA;
 
 /// This struct represents a combined color from a numeric color and
 /// the current foreground color (currentcolor keyword).
@@ -27,7 +27,20 @@ pub enum GenericColor<RGBA, Percentage> {
 /// A color space as defined in [1].
 ///
 /// [1]: https://drafts.csswg.org/css-color-4/#typedef-color-space
-#[derive(Clone, Copy, Debug, Eq, MallocSizeOf, Parse, PartialEq, ToAnimatedValue, ToComputedValue, ToCss, ToResolvedValue, ToShmem)]
+#[derive(
+    Clone,
+    Copy,
+    Debug,
+    Eq,
+    MallocSizeOf,
+    Parse,
+    PartialEq,
+    ToAnimatedValue,
+    ToComputedValue,
+    ToCss,
+    ToResolvedValue,
+    ToShmem,
+)]
 #[repr(u8)]
 pub enum ColorSpace {
     /// The sRGB color space.
@@ -63,7 +76,20 @@ impl ColorSpace {
 /// A hue-interpolation-method as defined in [1].
 ///
 /// [1]: https://drafts.csswg.org/css-color-4/#typedef-hue-interpolation-method
-#[derive(Clone, Copy, Debug, Eq, MallocSizeOf, Parse, PartialEq, ToAnimatedValue, ToComputedValue, ToCss, ToResolvedValue, ToShmem)]
+#[derive(
+    Clone,
+    Copy,
+    Debug,
+    Eq,
+    MallocSizeOf,
+    Parse,
+    PartialEq,
+    ToAnimatedValue,
+    ToComputedValue,
+    ToCss,
+    ToResolvedValue,
+    ToShmem,
+)]
 #[repr(u8)]
 pub enum HueInterpolationMethod {
     /// https://drafts.csswg.org/css-color-4/#shorter
@@ -79,7 +105,18 @@ pub enum HueInterpolationMethod {
 }
 
 /// https://drafts.csswg.org/css-color-4/#color-interpolation-method
-#[derive(Clone, Copy, Debug, Eq, MallocSizeOf, PartialEq, ToShmem, ToAnimatedValue, ToComputedValue, ToResolvedValue)]
+#[derive(
+    Clone,
+    Copy,
+    Debug,
+    Eq,
+    MallocSizeOf,
+    PartialEq,
+    ToShmem,
+    ToAnimatedValue,
+    ToComputedValue,
+    ToResolvedValue,
+)]
 #[repr(C)]
 pub struct ColorInterpolationMethod {
     /// The color-space the interpolation should be done in.
@@ -109,11 +146,13 @@ impl Parse for ColorInterpolationMethod {
         //     Unless otherwise specified, if no specific hue interpolation
         //     algorithm is selected by the host syntax, the default is shorter.
         let hue = if space.is_polar() {
-            input.try_parse(|input| -> Result<_, ParseError<'i>> {
-                let hue = HueInterpolationMethod::parse(input)?;
-                input.expect_ident_matching("hue")?;
-                Ok(hue)
-            }).unwrap_or(HueInterpolationMethod::Shorter)
+            input
+                .try_parse(|input| -> Result<_, ParseError<'i>> {
+                    let hue = HueInterpolationMethod::parse(input)?;
+                    input.expect_ident_matching("hue")?;
+                    Ok(hue)
+                })
+                .unwrap_or(HueInterpolationMethod::Shorter)
         } else {
             HueInterpolationMethod::Shorter
         };
@@ -141,7 +180,16 @@ impl ToCss for ColorInterpolationMethod {
 /// percentages.
 ///
 /// https://drafts.csswg.org/css-color-5/#color-mix
-#[derive(Clone, Debug, MallocSizeOf, PartialEq, ToAnimatedValue, ToComputedValue, ToResolvedValue, ToShmem)]
+#[derive(
+    Clone,
+    Debug,
+    MallocSizeOf,
+    PartialEq,
+    ToAnimatedValue,
+    ToComputedValue,
+    ToResolvedValue,
+    ToShmem,
+)]
 #[allow(missing_docs)]
 #[repr(C)]
 pub struct GenericColorMix<Color, Percentage> {
@@ -160,7 +208,11 @@ impl<Color: ToCss, Percentage: ToCss + ToPercentage> ToCss for ColorMix<Color, P
     where
         W: Write,
     {
-        fn can_omit<Percentage: ToPercentage>(percent: &Percentage, other: &Percentage, is_left: bool) -> bool {
+        fn can_omit<Percentage: ToPercentage>(
+            percent: &Percentage,
+            other: &Percentage,
+            is_left: bool,
+        ) -> bool {
             if percent.is_calc() {
                 return false;
             }
diff --git a/servo/components/style/values/generics/transform.rs b/servo/components/style/values/generics/transform.rs
index 67db199c14b1..6d8115005d99 100644
--- a/servo/components/style/values/generics/transform.rs
+++ b/servo/components/style/values/generics/transform.rs
@@ -404,7 +404,10 @@ impl ToAbsoluteLength for ComputedLength {
 impl ToAbsoluteLength for ComputedLengthPercentage {
     #[inline]
     fn to_pixel_length(&self, containing_len: Option<ComputedLength>) -> Result<CSSFloat, ()> {
-        Ok(self.maybe_percentage_relative_to(containing_len).ok_or(())?.px())
+        Ok(self
+            .maybe_percentage_relative_to(containing_len)
+            .ok_or(())?
+            .px())
     }
 }
 
@@ -576,13 +579,14 @@ impl<T: ToMatrix> Transform<T> {
     }
 
     /// Converts a series of components to a 3d matrix.
+    #[cfg_attr(rustfmt, rustfmt_skip)]
     pub fn components_to_transform_3d_matrix(
         ops: &[T],
-        reference_box: Option<&Rect<ComputedLength>>
+        reference_box: Option<&Rect<ComputedLength>>,
     ) -> Result<(Transform3D<CSSFloat>, bool), ()> {
         let cast_3d_transform = |m: Transform3D<f64>| -> Transform3D<CSSFloat> {
             use std::{f32, f64};
-            let cast = |v: f64| { v.min(f32::MAX as f64).max(f32::MIN as f64) as f32 };
+            let cast = |v: f64| v.min(f32::MAX as f64).max(f32::MIN as f64) as f32;
             Transform3D::new(
                 cast(m.m11), cast(m.m12), cast(m.m13), cast(m.m14),
                 cast(m.m21), cast(m.m22), cast(m.m23), cast(m.m24),
diff --git a/servo/components/style/values/mod.rs b/servo/components/style/values/mod.rs
index 1574a0b50509..3a9892058471 100644
--- a/servo/components/style/values/mod.rs
+++ b/servo/components/style/values/mod.rs
@@ -491,7 +491,15 @@ impl ToCss for CustomIdent {
 /// We use a single atom for these. Empty atom represents `none` animation.
 #[repr(transparent)]
 #[derive(
-    Clone, Debug, Hash, PartialEq, MallocSizeOf, SpecifiedValueInfo, ToComputedValue, ToResolvedValue, ToShmem,
+    Clone,
+    Debug,
+    Hash,
+    PartialEq,
+    MallocSizeOf,
+    SpecifiedValueInfo,
+    ToComputedValue,
+    ToResolvedValue,
+    ToShmem,
 )]
 pub struct TimelineOrKeyframesName(Atom);
 
@@ -539,7 +547,7 @@ impl TimelineOrKeyframesName {
         debug_assert!(invalid.contains(&"none"));
 
         if self.0 == atom!("") {
-            return dest.write_str("none")
+            return dest.write_str("none");
         }
 
         self.0.with_str(|s| {
@@ -564,7 +572,17 @@ pub trait IsAuto {
 /// The typedef of <timeline-name>.
 #[repr(transparent)]
 #[derive(
-    Clone, Debug, Deref, Hash, Eq, PartialEq, MallocSizeOf, SpecifiedValueInfo, ToComputedValue, ToResolvedValue, ToShmem,
+    Clone,
+    Debug,
+    Deref,
+    Hash,
+    Eq,
+    PartialEq,
+    MallocSizeOf,
+    SpecifiedValueInfo,
+    ToComputedValue,
+    ToResolvedValue,
+    ToShmem,
 )]
 pub struct TimelineName(TimelineOrKeyframesName);
 
@@ -582,8 +600,14 @@ impl TimelineName {
 }
 
 impl Parse for TimelineName {
-    fn parse<'i, 't>(_: &ParserContext, input: &mut Parser<'i, 't>) -> Result<Self, ParseError<'i>> {
-        Ok(Self(TimelineOrKeyframesName::parse(input, &["none", "auto"])?))
+    fn parse<'i, 't>(
+        _: &ParserContext,
+        input: &mut Parser<'i, 't>,
+    ) -> Result<Self, ParseError<'i>> {
+        Ok(Self(TimelineOrKeyframesName::parse(
+            input,
+            &["none", "auto"],
+        )?))
     }
 }
 
@@ -598,7 +622,17 @@ impl ToCss for TimelineName {
 
 /// The typedef of <keyframes-name>.
 #[derive(
-    Clone, Debug, Deref, Hash, Eq, PartialEq, MallocSizeOf, SpecifiedValueInfo, ToComputedValue, ToResolvedValue, ToShmem,
+    Clone,
+    Debug,
+    Deref,
+    Hash,
+    Eq,
+    PartialEq,
+    MallocSizeOf,
+    SpecifiedValueInfo,
+    ToComputedValue,
+    ToResolvedValue,
+    ToShmem,
 )]
 pub struct KeyframesName(TimelineOrKeyframesName);
 
@@ -616,7 +650,10 @@ impl KeyframesName {
 }
 
 impl Parse for KeyframesName {
-    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>> {
         Ok(Self(TimelineOrKeyframesName::parse(input, &["none"])?))
     }
 }
diff --git a/servo/components/style/values/specified/box.rs b/servo/components/style/values/specified/box.rs
index bc358ab7e305..bf1a74b683cf 100644
--- a/servo/components/style/values/specified/box.rs
+++ b/servo/components/style/values/specified/box.rs
@@ -8,10 +8,14 @@ use crate::custom_properties::Name as CustomPropertyName;
 use crate::parser::{Parse, ParserContext};
 use crate::properties::{LonghandId, PropertyDeclarationId};
 use crate::properties::{PropertyId, ShorthandId};
-use crate::values::generics::box_::{GenericAnimationIterationCount, GenericPerspective, GenericLineClamp};
-use crate::values::generics::box_::{GenericContainIntrinsicSize, GenericVerticalAlign, VerticalAlignKeyword};
+use crate::values::generics::box_::{
+    GenericAnimationIterationCount, GenericLineClamp, GenericPerspective,
+};
+use crate::values::generics::box_::{
+    GenericContainIntrinsicSize, GenericVerticalAlign, VerticalAlignKeyword,
+};
 use crate::values::specified::length::{LengthPercentage, NonNegativeLength};
-use crate::values::specified::{AllowQuirks, Number, Integer};
+use crate::values::specified::{AllowQuirks, Integer, Number};
 use crate::values::{CustomIdent, KeyframesName, TimelineName};
 use crate::Atom;
 use cssparser::Parser;
@@ -885,7 +889,10 @@ impl Parse for AnimationTimeline {
         }
 
         // https://drafts.csswg.org/scroll-animations-1/rewrite#scroll-notation
-        if input.try_parse(|i| i.expect_function_matching("scroll")).is_ok() {
+        if input
+            .try_parse(|i| i.expect_function_matching("scroll"))
+            .is_ok()
+        {
             return input.parse_nested_block(|i| {
                 Ok(Self::Scroll(
                     i.try_parse(ScrollAxis::parse).unwrap_or(ScrollAxis::Block),
@@ -1450,9 +1457,7 @@ impl Parse for ContainIntrinsicSize {
         context: &ParserContext,
         input: &mut Parser<'i, 't>,
     ) -> Result<Self, ParseError<'i>> {
-
-        if let Ok(l) = input.try_parse(|i| NonNegativeLength::parse(context, i))
-        {
+        if let Ok(l) = input.try_parse(|i| NonNegativeLength::parse(context, i)) {
             return Ok(Self::Length(l));
         }
 
@@ -1472,9 +1477,10 @@ impl Parse for LineClamp {
         context: &ParserContext,
         input: &mut Parser<'i, 't>,
     ) -> Result<Self, ParseError<'i>> {
-        if let Ok(i) = input.try_parse(|i| crate::values::specified::PositiveInteger::parse(context, i))
+        if let Ok(i) =
+            input.try_parse(|i| crate::values::specified::PositiveInteger::parse(context, i))
         {
-            return Ok(Self(i.0))
+            return Ok(Self(i.0));
         }
         input.expect_ident_matching("none")?;
         Ok(Self::none())
@@ -1531,7 +1537,17 @@ bitflags! {
 
 /// https://drafts.csswg.org/css-contain-3/#container-name
 #[repr(transparent)]
-#[derive(Clone, Debug, MallocSizeOf, PartialEq, SpecifiedValueInfo, ToComputedValue, ToCss, ToResolvedValue, ToShmem)]
+#[derive(
+    Clone,
+    Debug,
+    MallocSizeOf,
+    PartialEq,
+    SpecifiedValueInfo,
+    ToComputedValue,
+    ToCss,
+    ToResolvedValue,
+    ToShmem,
+)]
 pub struct ContainerName(#[css(iterable, if_empty = "none")] pub crate::OwnedSlice<CustomIdent>);
 
 impl ContainerName {
@@ -1547,17 +1563,29 @@ impl ContainerName {
 }
 
 impl Parse for ContainerName {
-    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 mut idents = vec![];
         let location = input.current_source_location();
         let first = input.expect_ident()?;
         if first.eq_ignore_ascii_case("none") {
-            return Ok(Self::none())
+            return Ok(Self::none());
         }
-        const DISALLOWED_CONTAINER_NAMES: &'static [&'static str] = &["none", "not", "or", "and", "auto", "normal"];
-        idents.push(CustomIdent::from_ident(location, first, DISALLOWED_CONTAINER_NAMES)?);
+        const DISALLOWED_CONTAINER_NAMES: &'static [&'static str] =
+            &["none", "not", "or", "and", "auto", "normal"];
+        idents.push(CustomIdent::from_ident(
+            location,
+            first,
+            DISALLOWED_CONTAINER_NAMES,
+        )?);
         while let Ok(ident) = input.try_parse(|input| input.expect_ident_cloned()) {
-            idents.push(CustomIdent::from_ident(location, &ident, DISALLOWED_CONTAINER_NAMES)?);
+            idents.push(CustomIdent::from_ident(
+                location,
+                &ident,
+                DISALLOWED_CONTAINER_NAMES,
+            )?);
         }
         Ok(ContainerName(idents.into()))
     }
@@ -2180,7 +2208,10 @@ pub enum Overflow {
 // This can be derived once we remove or keep `-moz-hidden-unscrollable`
 // indefinitely.
 impl Parse for Overflow {
-    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>> {
         Ok(try_match_ident_ignore_ascii_case! { input,
             "visible" => Self::Visible,
             "hidden" => Self::Hidden,
diff --git a/servo/components/style/values/specified/calc.rs b/servo/components/style/values/specified/calc.rs
index efb4d383c5e5..6492f94ed2b5 100644
--- a/servo/components/style/values/specified/calc.rs
+++ b/servo/components/style/values/specified/calc.rs
@@ -142,11 +142,10 @@ impl CalcLengthPercentage {
 
         let a = a.as_length()?.unitless_value();
         let b = b.as_length()?.unitless_value();
-        return Some((a, b))
+        return Some((a, b));
     }
 }
 
-
 impl SpecifiedValueInfo for CalcLengthPercentage {}
 
 impl PartialOrd for Leaf {
@@ -321,7 +320,9 @@ impl CalcNode {
         let location = input.current_source_location();
         match input.next()? {
             &Token::Number { value, .. } => Ok(CalcNode::Leaf(Leaf::Number(value))),
-            &Token::Dimension { value, ref unit, .. } => {
+            &Token::Dimension {
+                value, ref unit, ..
+            } => {
                 if allowed_units.intersects(CalcUnits::LENGTH) {
                     if let Ok(l) = NoCalcLength::parse_dimension(context, value, unit) {
                         return Ok(CalcNode::Leaf(Leaf::Length(l)));
@@ -337,11 +338,13 @@ impl CalcNode {
                         return Ok(CalcNode::Leaf(Leaf::Time(t)));
                     }
                 }
-                return Err(location.new_custom_error(StyleParseErrorKind::UnspecifiedError))
+                return Err(location.new_custom_error(StyleParseErrorKind::UnspecifiedError));
             },
-            &Token::Percentage { unit_value, .. } if allowed_units.intersects(CalcUnits::PERCENTAGE) => {
+            &Token::Percentage { unit_value, .. }
+                if allowed_units.intersects(CalcUnits::PERCENTAGE) =>
+            {
                 Ok(CalcNode::Leaf(Leaf::Percentage(unit_value)))
-            }
+            },
             &Token::ParenthesisBlock => input.parse_nested_block(|input| {
                 CalcNode::parse_argument(context, input, allowed_units)
             }),
@@ -487,9 +490,11 @@ impl CalcNode {
 
                     let radians = match resolve_atan2(a, b) {
                         Ok(v) => v,
-                        Err(()) => return Err(
-                            input.new_custom_error(StyleParseErrorKind::UnspecifiedError)
-                        ),
+                        Err(()) => {
+                            return Err(
+                                input.new_custom_error(StyleParseErrorKind::UnspecifiedError)
+                            )
+                        },
                     };
 
                     Ok(Self::Leaf(Leaf::Angle(Angle::from_radians(radians))))
@@ -581,9 +586,11 @@ impl CalcNode {
                     // TODO(emilio): Eventually it should be.
                     let number = match rhs.to_number() {
                         Ok(n) if n != 0. || nan_inf_enabled() => n,
-                        _ => return Err(
-                            input.new_custom_error(StyleParseErrorKind::UnspecifiedError)
-                        ),
+                        _ => {
+                            return Err(
+                                input.new_custom_error(StyleParseErrorKind::UnspecifiedError)
+                            )
+                        },
                     };
                     node.mul_by(1. / number);
                 },
diff --git a/servo/components/style/values/specified/color.rs b/servo/components/style/values/specified/color.rs
index c687387ce7ef..d098949ff8cd 100644
--- a/servo/components/style/values/specified/color.rs
+++ b/servo/components/style/values/specified/color.rs
@@ -7,7 +7,9 @@
 use super::AllowQuirks;
 use crate::parser::{Parse, ParserContext};
 use crate::values::computed::{Color as ComputedColor, Context, ToComputedValue};
-use crate::values::generics::color::{ColorInterpolationMethod, GenericColorMix, GenericCaretColor, GenericColorOrAuto};
+use crate::values::generics::color::{
+    ColorInterpolationMethod, GenericCaretColor, GenericColorMix, GenericColorOrAuto,
+};
 use crate::values::specified::calc::CalcNode;
 use crate::values::specified::Percentage;
 use crate::values::CustomIdent;
@@ -618,7 +620,9 @@ impl Color {
         let mut written = space_padding;
         let mut buf = itoa::Buffer::new();
         let s = buf.format(value);
-        (&mut serialization[written..]).write_all(s.as_bytes()).unwrap();
+        (&mut serialization[written..])
+            .write_all(s.as_bytes())
+            .unwrap();
         written += s.len();
         if let Some(unit) = unit {
             written += (&mut serialization[written..])
diff --git a/servo/components/style/values/specified/easing.rs b/servo/components/style/values/specified/easing.rs
index 26c66345413f..e10eb0b98b6b 100644
--- a/servo/components/style/values/specified/easing.rs
+++ b/servo/components/style/values/specified/easing.rs
@@ -110,10 +110,12 @@ impl TimingFunction {
         input: &mut Parser<'i, 't>,
     ) -> Result<Self, ParseError<'i>> {
         let steps = Integer::parse_positive(context, input)?;
-        let position = input.try_parse(|i| {
-            i.expect_comma()?;
-            StepPosition::parse(context, i)
-        }).unwrap_or(StepPosition::End);
+        let position = input
+            .try_parse(|i| {
+                i.expect_comma()?;
+                StepPosition::parse(context, i)
+            })
+            .unwrap_or(StepPosition::End);
 
         // jump-none accepts a positive integer greater than 1.
         // FIXME(emilio): The spec asks us to avoid rejecting it at parse
@@ -149,10 +151,19 @@ impl TimingFunction {
                     input_start = i.try_parse(|i| Percentage::parse(context, i)).ok();
                     input_end = i.try_parse(|i| Percentage::parse(context, i)).ok();
                 }
-                result.push(LinearStop { output, input: input_start.into() });
+                result.push(LinearStop {
+                    output,
+                    input: input_start.into(),
+                });
                 if input_end.is_some() {
-                    debug_assert!(input_start.is_some(), "Input end valid but not input start?");
-                    result.push(LinearStop { output, input: input_end.into() });
+                    debug_assert!(
+                        input_start.is_some(),
+                        "Input end valid but not input start?"
+                    );
+                    result.push(LinearStop {
+                        output,
+                        input: input_end.into(),
+                    });
                 }
 
                 Ok(())
diff --git a/servo/components/style/values/specified/font.rs b/servo/components/style/values/specified/font.rs
index 5c6b246f7656..6ad2b0f6234f 100644
--- a/servo/components/style/values/specified/font.rs
+++ b/servo/components/style/values/specified/font.rs
@@ -8,8 +8,8 @@ use crate::context::QuirksMode;
 use crate::parser::{Parse, ParserContext};
 use crate::values::computed::font::{FamilyName, FontFamilyList, SingleFontFamily};
 use crate::values::computed::FontSizeAdjust as ComputedFontSizeAdjust;
-use crate::values::computed::{font as computed, Length, NonNegativeLength};
 use crate::values::computed::Percentage as ComputedPercentage;
+use crate::values::computed::{font as computed, Length, NonNegativeLength};
 use crate::values::computed::{CSSPixelLength, Context, ToComputedValue};
 use crate::values::generics::font::VariationValue;
 use crate::values::generics::font::{
@@ -187,9 +187,7 @@ impl AbsoluteFontWeight {
     /// Returns the computed value for this absolute font weight.
     pub fn compute(&self) -> computed::FontWeight {
         match *self {
-            AbsoluteFontWeight::Weight(weight) => {
-                computed::FontWeight::from_float(weight.get())
-            },
+            AbsoluteFontWeight::Weight(weight) => computed::FontWeight::from_float(weight.get()),
             AbsoluteFontWeight::Normal => computed::FontWeight::NORMAL,
             AbsoluteFontWeight::Bold => computed::FontWeight::BOLD,
         }
@@ -438,7 +436,7 @@ impl ToComputedValue for FontStretch {
 
     fn from_computed_value(computed: &Self::ComputedValue) -> Self {
         FontStretch::Stretch(NonNegativePercentage::from_computed_value(&NonNegative(
-            computed.to_percentage()
+            computed.to_percentage(),
         )))
     }
 }
@@ -777,7 +775,9 @@ impl FontSizeKeyword {
     fn to_length(&self, cx: &Context) -> NonNegativeLength {
         let gecko_font = cx.style().get_font().gecko();
         let family = &gecko_font.mFont.family.families;
-        let generic = family.single_generic().unwrap_or(computed::GenericFontFamily::None);
+        let generic = family
+            .single_generic()
+            .unwrap_or(computed::GenericFontFamily::None);
         let base_size = unsafe {
             Atom::with(gecko_font.mLanguage.mRawPtr, |language| {
                 cx.device().base_size_for_generic(language, generic)
diff --git a/servo/components/style/values/specified/image.rs b/servo/components/style/values/specified/image.rs
index 289140cbada0..35d882b18d87 100644
--- a/servo/components/style/values/specified/image.rs
+++ b/servo/components/style/values/specified/image.rs
@@ -304,12 +304,16 @@ impl CrossFade {
 }
 
 impl CrossFadeElement {
-    fn parse_percentage<'i, 't>(context: &ParserContext, input: &mut Parser<'i, 't>) -> Option<Percentage> {
+    fn parse_percentage<'i, 't>(
+        context: &ParserContext,
+        input: &mut Parser<'i, 't>,
+    ) -> Option<Percentage> {
         // We clamp our values here as this is the way that Safari and Chrome's
         // implementation handle out-of-bounds percentages but whether or not
         // this behavior follows the specification is still being discussed.
         // See: <https://github.com/w3c/csswg-drafts/issues/5333>
-        input.try_parse(|input| Percentage::parse_non_negative(context, input))
+        input
+            .try_parse(|input| Percentage::parse_non_negative(context, input))
             .ok()
             .map(|p| p.clamp_to_hundred())
     }
diff --git a/servo/components/style/values/specified/length.rs b/servo/components/style/values/specified/length.rs
index e902af9b7e59..e30a81a590a8 100644
--- a/servo/components/style/values/specified/length.rs
+++ b/servo/components/style/values/specified/length.rs
@@ -162,11 +162,7 @@ impl FontRelativeLength {
             orientation: FontMetricsOrientation,
         ) -> FontMetrics {
             let retrieve_math_scales = false;
-            context.query_font_metrics(
-                base_size,
-                orientation,
-                retrieve_math_scales,
-            )
+            context.query_font_metrics(base_size, orientation, retrieve_math_scales)
         }
 
         let reference_font_size = base_size.resolve(context);
@@ -404,125 +400,34 @@ impl ViewportPercentageLength {
 
     fn unpack(&self) -> (ViewportVariant, ViewportUnit, CSSFloat) {
         match *self {
-            ViewportPercentageLength::Vw(v) => (
-                ViewportVariant::UADefault,
-                ViewportUnit::Vw,
-                v,
-            ),
-            ViewportPercentageLength::Svw(v) => (
-                ViewportVariant::Small,
-                ViewportUnit::Vw,
-                v,
-            ),
-            ViewportPercentageLength::Lvw(v) => (
-                ViewportVariant::Large,
-                ViewportUnit::Vw,
-                v,
-            ),
-            ViewportPercentageLength::Dvw(v) => (
-                ViewportVariant::Dynamic,
-                ViewportUnit::Vw,
-                v,
-            ),
-            ViewportPercentageLength::Vh(v) => (
-                ViewportVariant::UADefault,
-                ViewportUnit::Vh,
-                v,
-            ),
-            ViewportPercentageLength::Svh(v) => (
-                ViewportVariant::Small,
-                ViewportUnit::Vh,
-                v,
-            ),
-            ViewportPercentageLength::Lvh(v) => (
-                ViewportVariant::Large,
-                ViewportUnit::Vh,
-                v),
-            ViewportPercentageLength::Dvh(v) => (
-                ViewportVariant::Dynamic,
-                ViewportUnit::Vh,
-                v,
-            ),
-            ViewportPercentageLength::Vmin(v) => (
-                ViewportVariant::UADefault,
-                ViewportUnit::Vmin,
-                v,
-            ),
-            ViewportPercentageLength::Svmin(v) => (
-                ViewportVariant::Small,
-                ViewportUnit::Vmin,
-                v,
-            ),
-            ViewportPercentageLength::Lvmin(v) => (
-                ViewportVariant::Large,
-                ViewportUnit::Vmin,
-                v,
-            ),
-            ViewportPercentageLength::Dvmin(v) => (
-                ViewportVariant::Dynamic,
-                ViewportUnit::Vmin,
-                v,
-            ),
-            ViewportPercentageLength::Vmax(v) => (
-                ViewportVariant::UADefault,
-                ViewportUnit::Vmax,
-                v,
-            ),
-            ViewportPercentageLength::Svmax(v) => (
-                ViewportVariant::Small,
-                ViewportUnit::Vmax,
-                v,
-            ),
-            ViewportPercentageLength::Lvmax(v) => (
-                ViewportVariant::Large,
-                ViewportUnit::Vmax,
-                v,
-            ),
-            ViewportPercentageLength::Dvmax(v) => (
-                ViewportVariant::Dynamic,
-                ViewportUnit::Vmax,
-                v,
-            ),
-            ViewportPercentageLength::Vb(v) => (
-                ViewportVariant::UADefault,
-                ViewportUnit::Vb,
-                v,
-            ),
-            ViewportPercentageLength::Svb(v) => (
-                ViewportVariant::Small,
-                ViewportUnit::Vb,
-                v,
-            ),
-            ViewportPercentageLength::Lvb(v) => (
-                ViewportVariant::Large,
-                ViewportUnit::Vb,
-                v,
-            ),
-            ViewportPercentageLength::Dvb(v) => (
-                ViewportVariant::Dynamic,
-                ViewportUnit::Vb,
-                v,
-            ),
-            ViewportPercentageLength::Vi(v) => (
-                ViewportVariant::UADefault,
-                ViewportUnit::Vi,
-                v,
-            ),
-            ViewportPercentageLength::Svi(v) => (
-                ViewportVariant::Small,
-                ViewportUnit::Vi,
-                v,
-            ),
-            ViewportPercentageLength::Lvi(v) => (
-                ViewportVariant::Large,
-                ViewportUnit::Vi,
-                v,
-            ),
-            ViewportPercentageLength::Dvi(v) => (
-                ViewportVariant::Dynamic,
-                ViewportUnit::Vi,
-                v,
-            ),
+            ViewportPercentageLength::Vw(v) => (ViewportVariant::UADefault, ViewportUnit::Vw, v),
+            ViewportPercentageLength::Svw(v) => (ViewportVariant::Small, ViewportUnit::Vw, v),
+            ViewportPercentageLength::Lvw(v) => (ViewportVariant::Large, ViewportUnit::Vw, v),
+            ViewportPercentageLength::Dvw(v) => (ViewportVariant::Dynamic, ViewportUnit::Vw, v),
+            ViewportPercentageLength::Vh(v) => (ViewportVariant::UADefault, ViewportUnit::Vh, v),
+            ViewportPercentageLength::Svh(v) => (ViewportVariant::Small, ViewportUnit::Vh, v),
+            ViewportPercentageLength::Lvh(v) => (ViewportVariant::Large, ViewportUnit::Vh, v),
+            ViewportPercentageLength::Dvh(v) => (ViewportVariant::Dynamic, ViewportUnit::Vh, v),
+            ViewportPercentageLength::Vmin(v) => {
+                (ViewportVariant::UADefault, ViewportUnit::Vmin, v)
+            },
+            ViewportPercentageLength::Svmin(v) => (ViewportVariant::Small, ViewportUnit::Vmin, v),
+            ViewportPercentageLength::Lvmin(v) => (ViewportVariant::Large, ViewportUnit::Vmin, v),
+            ViewportPercentageLength::Dvmin(v) => (ViewportVariant::Dynamic, ViewportUnit::Vmin, v),
+            ViewportPercentageLength::Vmax(v) => {
+                (ViewportVariant::UADefault, ViewportUnit::Vmax, v)
+            },
+            ViewportPercentageLength::Svmax(v) => (ViewportVariant::Small, ViewportUnit::Vmax, v),
+            ViewportPercentageLength::Lvmax(v) => (ViewportVariant::Large, ViewportUnit::Vmax, v),
+            ViewportPercentageLength::Dvmax(v) => (ViewportVariant::Dynamic, ViewportUnit::Vmax, v),
+            ViewportPercentageLength::Vb(v) => (ViewportVariant::UADefault, ViewportUnit::Vb, v),
+            ViewportPercentageLength::Svb(v) => (ViewportVariant::Small, ViewportUnit::Vb, v),
+            ViewportPercentageLength::Lvb(v) => (ViewportVariant::Large, ViewportUnit::Vb, v),
+            ViewportPercentageLength::Dvb(v) => (ViewportVariant::Dynamic, ViewportUnit::Vb, v),
+            ViewportPercentageLength::Vi(v) => (ViewportVariant::UADefault, ViewportUnit::Vi, v),
+            ViewportPercentageLength::Svi(v) => (ViewportVariant::Small, ViewportUnit::Vi, v),
+            ViewportPercentageLength::Lvi(v) => (ViewportVariant::Large, ViewportUnit::Vi, v),
+            ViewportPercentageLength::Dvi(v) => (ViewportVariant::Dynamic, ViewportUnit::Vi, v),
         }
     }
 
@@ -562,11 +467,9 @@ impl ViewportPercentageLength {
             // able to figure it own on its own so we help.
             _ => unsafe {
                 match *self {
-                    Vw(..) | Svw(..) | Lvw(..) | Dvw(..) |
-                    Vh(..) | Svh(..) | Lvh(..) | Dvh(..) |
-                    Vmin(..) | Svmin(..) | Lvmin(..) | Dvmin(..) |
-                    Vmax(..) | Svmax(..) | Lvmax(..) | Dvmax(..) |
-                    Vb(..) | Svb(..) | Lvb(..) | Dvb(..) |
+                    Vw(..) | Svw(..) | Lvw(..) | Dvw(..) | Vh(..) | Svh(..) | Lvh(..) |
+                    Dvh(..) | Vmin(..) | Svmin(..) | Lvmin(..) | Dvmin(..) | Vmax(..) |
+                    Svmax(..) | Lvmax(..) | Dvmax(..) | Vb(..) | Svb(..) | Lvb(..) | Dvb(..) |
                     Vi(..) | Svi(..) | Lvi(..) | Dvi(..) => {},
                 }
                 debug_unreachable!("Forgot to handle unit in try_sum()")
@@ -809,10 +712,8 @@ 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(..) => true,
-            Self::ServoCharacterWidth(..) |
-            Self::FontRelative(..) => false,
+            Self::Absolute(..) | Self::ViewportPercentage(..) => true,
+            Self::ServoCharacterWidth(..) | Self::FontRelative(..) => false,
         }
     }
 
@@ -1157,11 +1058,9 @@ impl PartialOrd for ViewportPercentageLength {
             // able to figure it own on its own so we help.
             _ => unsafe {
                 match *self {
-                    Vw(..) | Svw(..) | Lvw(..) | Dvw(..) |
-                    Vh(..) | Svh(..) | Lvh(..) | Dvh(..) |
-                    Vmin(..) | Svmin(..) | Lvmin(..) | Dvmin(..) |
-                    Vmax(..) | Svmax(..) | Lvmax(..) | Dvmax(..) |
-                    Vb(..) | Svb(..) | Lvb(..) | Dvb(..) |
+                    Vw(..) | Svw(..) | Lvw(..) | Dvw(..) | Vh(..) | Svh(..) | Lvh(..) |
+                    Dvh(..) | Vmin(..) | Svmin(..) | Lvmin(..) | Dvmin(..) | Vmax(..) |
+                    Svmax(..) | Lvmax(..) | Dvmax(..) | Vb(..) | Svb(..) | Lvb(..) | Dvb(..) |
                     Vi(..) | Svi(..) | Lvi(..) | Dvi(..) => {},
                 }
                 debug_unreachable!("Forgot an arm in partial_cmp?")
diff --git a/servo/components/style/values/specified/mod.rs b/servo/components/style/values/specified/mod.rs
index f84e96f3d2a3..b31bc17300e5 100644
--- a/servo/components/style/values/specified/mod.rs
+++ b/servo/components/style/values/specified/mod.rs
@@ -38,7 +38,9 @@ pub use self::border::{BorderImageRepeat, BorderImageSideWidth};
 pub use self::border::{BorderRadius, BorderSideWidth, BorderSpacing, BorderStyle};
 pub use self::box_::{AnimationIterationCount, AnimationName, AnimationTimeline, Contain, Display};
 pub use self::box_::{Appearance, BreakBetween, BreakWithin, ContainerName, ContainerType};
-pub use self::box_::{Clear, ContentVisibility, ContainIntrinsicSize, LineClamp, Float, Overflow, OverflowAnchor};
+pub use self::box_::{
+    Clear, ContainIntrinsicSize, ContentVisibility, Float, LineClamp, Overflow, OverflowAnchor,
+};
 pub use self::box_::{OverflowClipBox, OverscrollBehavior, Perspective, Resize, ScrollbarGutter};
 pub use self::box_::{ScrollAxis, ScrollSnapAlign, ScrollSnapAxis, ScrollSnapStop};
 pub use self::box_::{ScrollSnapStrictness, ScrollSnapType, ScrollTimelineName};
@@ -70,7 +72,7 @@ pub use self::list::ListStyleType;
 pub use self::list::Quotes;
 pub use self::motion::{OffsetPath, OffsetRotate};
 pub use self::outline::OutlineStyle;
-pub use self::page::{PageOrientation, PageName, PageSize, PaperSize};
+pub use self::page::{PageName, PageOrientation, PageSize, PaperSize};
 pub use self::percentage::{NonNegativePercentage, Percentage};
 pub use self::position::AspectRatio;
 pub use self::position::{
@@ -97,7 +99,7 @@ pub use self::transform::{Rotate, Scale, Transform};
 pub use self::transform::{TransformOrigin, TransformStyle, Translate};
 #[cfg(feature = "gecko")]
 pub use self::ui::CursorImage;
-pub use self::ui::{Cursor, BoolInteger, UserSelect};
+pub use self::ui::{BoolInteger, Cursor, UserSelect};
 pub use super::generics::grid::GridTemplateComponent as GenericGridTemplateComponent;
 
 #[cfg(feature = "gecko")]
diff --git a/servo/components/style/values/specified/percentage.rs b/servo/components/style/values/specified/percentage.rs
index 1f92c6c3e6a0..ba5f92db924e 100644
--- a/servo/components/style/values/specified/percentage.rs
+++ b/servo/components/style/values/specified/percentage.rs
@@ -186,7 +186,9 @@ impl SpecifiedValueInfo for Percentage {}
 /// Turns the percentage into a plain float.
 pub trait ToPercentage {
     /// Returns whether this percentage used to be a calc().
-    fn is_calc(&self) -> bool { false }
+    fn is_calc(&self) -> bool {
+        false
+    }
     /// Turns the percentage into a plain float.
     fn to_percentage(&self) -> CSSFloat;
 }
diff --git a/servo/components/style/values/specified/source_size_list.rs b/servo/components/style/values/specified/source_size_list.rs
index 4023467d1a84..f7a39a89f5b7 100644
--- a/servo/components/style/values/specified/source_size_list.rs
+++ b/servo/components/style/values/specified/source_size_list.rs
@@ -8,7 +8,7 @@
 use crate::gecko_bindings::sugar::ownership::{HasBoxFFI, HasFFI, HasSimpleFFI};
 use crate::media_queries::Device;
 use crate::parser::{Parse, ParserContext};
-use crate::queries::{QueryCondition, FeatureType};
+use crate::queries::{FeatureType, QueryCondition};
 use crate::values::computed::{self, ToComputedValue};
 use crate::values::specified::{Length, NoCalcLength, ViewportPercentageLength};
 use app_units::Au;
diff --git a/servo/components/style_derive/parse.rs b/servo/components/style_derive/parse.rs
index 8739269a0a6b..4324d90a9983 100644
--- a/servo/components/style_derive/parse.rs
+++ b/servo/components/style_derive/parse.rs
@@ -4,9 +4,9 @@
 
 use crate::to_css::{CssBitflagAttrs, CssVariantAttrs};
 use derive_common::cg;
-use proc_macro2::{TokenStream, Span};
+use proc_macro2::{Span, TokenStream};
 use quote::TokenStreamExt;
-use syn::{self, Ident, DeriveInput, Path};
+use syn::{self, DeriveInput, Ident, Path};
 use synstructure::{Structure, VariantInfo};
 
 #[derive(Default, FromVariant)]
@@ -109,9 +109,12 @@ fn parse_non_keyword_variant(
 
     if let Some(ref bitflags) = variant_attrs.bitflags {
         assert!(skip_try, "Should be the only variant");
-        assert!(parse_attrs.condition.is_none(), "Should be the only variant");
+        assert!(
+            parse_attrs.condition.is_none(),
+            "Should be the only variant"
+        );
         assert!(where_clause.is_none(), "Generic bitflags?");
-        return parse_bitflags(bitflags)
+        return parse_bitflags(bitflags);
     }
 
     let field_attrs = cg::parse_field_attrs::<ParseFieldAttrs>(binding_ast);
diff --git a/servo/components/style_derive/to_css.rs b/servo/components/style_derive/to_css.rs
index 031b583b7944..aa3353664854 100644
--- a/servo/components/style_derive/to_css.rs
+++ b/servo/components/style_derive/to_css.rs
@@ -96,7 +96,10 @@ pub fn derive(mut input: syn::DeriveInput) -> TokenStream {
     }
 
     if let Some(ref bitflags) = input_attrs.bitflags {
-        assert!(!input_attrs.derive_debug, "Bitflags can derive debug on their own");
+        assert!(
+            !input_attrs.derive_debug,
+            "Bitflags can derive debug on their own"
+        );
         assert!(where_clause.is_none(), "Generic bitflags?");
         return derive_bitflags(&input, bitflags);
     }
diff --git a/servo/ports/geckolib/glue.rs b/servo/ports/geckolib/glue.rs
index 903341702a6b..e88103c43979 100644
--- a/servo/ports/geckolib/glue.rs
+++ b/servo/ports/geckolib/glue.rs
@@ -28,7 +28,7 @@ use style::data::{self, ElementStyles};
 use style::dom::{ShowSubtreeData, TDocument, TElement, TNode};
 use style::driver;
 use style::error_reporting::{ContextualParseError, ParseErrorReporter};
-use style::font_face::{self, FontFaceSourceListComponent, FontFaceSourceFormat, Source};
+use style::font_face::{self, FontFaceSourceFormat, FontFaceSourceListComponent, Source};
 use style::gecko::data::{GeckoStyleSheet, PerDocumentStyleData, PerDocumentStyleDataImpl};
 use style::gecko::restyle_damage::GeckoRestyleDamage;
 use style::gecko::selector_parser::{NonTSPseudoClass, PseudoElement};
@@ -130,14 +130,16 @@ use style::traversal::resolve_style;
 use style::traversal::DomTraversal;
 use style::traversal_flags::{self, TraversalFlags};
 use style::use_counters::UseCounters;
-use style::values::animated::{Animate, Procedure, ToAnimatedZero};
 use style::values::animated::color::AnimatedRGBA;
-use style::values::generics::color::ColorInterpolationMethod;
-use style::values::generics::easing::BeforeFlag;
-use style::values::computed::font::{FontFamily, FontFamilyList, GenericFontFamily, FontWeight, FontStyle, FontStretch};
+use style::values::animated::{Animate, Procedure, ToAnimatedZero};
 use style::values::computed::easing::ComputedTimingFunction;
+use style::values::computed::font::{
+    FontFamily, FontFamilyList, FontStretch, FontStyle, FontWeight, GenericFontFamily,
+};
 use style::values::computed::{self, Context, ToComputedValue};
 use style::values::distance::ComputeSquaredDistance;
+use style::values::generics::color::ColorInterpolationMethod;
+use style::values::generics::easing::BeforeFlag;
 use style::values::specified::gecko::IntersectionObserverRootMargin;
 use style::values::specified::source_size_list::SourceSizeList;
 use style::values::{specified, AtomIdent, CustomIdent, KeyframesName};
@@ -2453,7 +2455,9 @@ pub extern "C" fn Servo_StyleRule_SelectorMatchesElement(
     pseudo_type: PseudoStyleType,
     relevant_link_visited: bool,
 ) -> bool {
-    use selectors::matching::{matches_selector, MatchingContext, MatchingMode, VisitedHandlingMode, NeedsSelectorFlags};
+    use selectors::matching::{
+        matches_selector, MatchingContext, MatchingMode, NeedsSelectorFlags, VisitedHandlingMode,
+    };
     read_locked_arc(rule, |rule: &StyleRule| {
         let index = index as usize;
         if index >= rule.selectors.0.len() {
@@ -2834,10 +2838,7 @@ pub extern "C" fn Servo_PageRule_SetStyle(
 }
 
 #[no_mangle]
-pub extern "C" fn Servo_PageRule_GetSelectorText(
-    rule: &RawServoPageRule,
-    result: &mut nsACString,
-) {
+pub extern "C" fn Servo_PageRule_GetSelectorText(rule: &RawServoPageRule, result: &mut nsACString) {
     read_locked_arc(rule, |rule: &PageRule| {
         rule.selectors.to_css(&mut CssWriter::new(result)).unwrap();
     })
@@ -2849,7 +2850,6 @@ pub extern "C" fn Servo_PageRule_SetSelectorText(
     rule: &RawServoPageRule,
     text: &nsACString,
 ) -> bool {
-
     let value_str = unsafe { text.as_str_unchecked() };
 
     write_locked_arc(rule, |rule: &mut PageRule| {
@@ -2886,7 +2886,6 @@ pub extern "C" fn Servo_PageRule_SetSelectorText(
     })
 }
 
-
 #[no_mangle]
 pub extern "C" fn Servo_SupportsRule_GetConditionText(
     rule: &RawServoSupportsRule,
@@ -2913,7 +2912,9 @@ pub extern "C" fn Servo_ContainerRule_GetContainerQuery(
     result: &mut nsACString,
 ) {
     read_locked_arc(rule, |rule: &ContainerRule| {
-        rule.query_condition().to_css(&mut CssWriter::new(result)).unwrap();
+        rule.query_condition()
+            .to_css(&mut CssWriter::new(result))
+            .unwrap();
     })
 }
 
@@ -2923,7 +2924,9 @@ pub extern "C" fn Servo_ContainerRule_QueryContainerFor(
     element: &RawGeckoElement,
 ) -> *const RawGeckoElement {
     read_locked_arc(rule, |rule: &ContainerRule| {
-        rule.condition.find_container(GeckoElement(element)).map_or(ptr::null(), |result| result.element.0)
+        rule.condition
+            .find_container(GeckoElement(element))
+            .map_or(ptr::null(), |result| result.element.0)
     })
 }
 
@@ -3221,9 +3224,10 @@ pub unsafe extern "C" fn Servo_FontFaceRule_GetSources(
         };
         let len = sources.iter().fold(0, |acc, src| {
             acc + match *src {
-                Source::Url(ref url) =>
+                Source::Url(ref url) => {
                     (if url.format_hint.is_some() { 2 } else { 1 }) +
-                    (if url.tech_flags.is_empty() { 0 } else { 1 }),
+                        (if url.tech_flags.is_empty() { 0 } else { 1 })
+                },
                 Source::Local(_) => 1,
             }
         });
@@ -3243,13 +3247,15 @@ pub unsafe extern "C" fn Servo_FontFaceRule_GetSources(
                         set_next(FontFaceSourceListComponent::Url(&url.url));
                         if let Some(hint) = &url.format_hint {
                             match hint {
-                                FontFaceSourceFormat::Keyword(kw) =>
-                                    set_next(FontFaceSourceListComponent::FormatHintKeyword(*kw)),
-                                FontFaceSourceFormat::String(s) =>
+                                FontFaceSourceFormat::Keyword(kw) => {
+                                    set_next(FontFaceSourceListComponent::FormatHintKeyword(*kw))
+                                },
+                                FontFaceSourceFormat::String(s) => {
                                     set_next(FontFaceSourceListComponent::FormatHintString {
                                         length: s.len(),
                                         utf8_bytes: s.as_ptr(),
-                                }),
+                                    })
+                                },
                             }
                         }
                         if !url.tech_flags.is_empty() {
@@ -4074,12 +4080,8 @@ fn get_pseudo_style(
     }
 
     Some(style.unwrap_or_else(|| {
-        StyleBuilder::for_inheritance(
-            stylist.device(),
-            Some(styles.primary()),
-            Some(pseudo),
-        )
-        .build()
+        StyleBuilder::for_inheritance(stylist.device(), Some(styles.primary()), Some(pseudo))
+            .build()
     }))
 }
 
@@ -4357,7 +4359,10 @@ pub unsafe extern "C" fn Servo_ParseProperty(
 }
 
 #[no_mangle]
-pub extern "C" fn Servo_ParseEasing(easing: &nsACString, output: &mut ComputedTimingFunction) -> bool {
+pub extern "C" fn Servo_ParseEasing(
+    easing: &nsACString,
+    output: &mut ComputedTimingFunction,
+) -> bool {
     use style::properties::longhands::transition_timing_function;
 
     let context = ParserContext::new(
@@ -4767,8 +4772,7 @@ pub unsafe extern "C" fn Servo_DeclarationBlock_SetPropertyToAnimationValue(
 ) -> bool {
     let animation_value = AnimationValue::as_arc(&animation_value);
     let non_custom_property_id = animation_value.id().into();
-    let mut source_declarations =
-        SourcePropertyDeclaration::with_one(animation_value.uncompute());
+    let mut source_declarations = SourcePropertyDeclaration::with_one(animation_value.uncompute());
 
     set_property_to_declarations(
         Some(non_custom_property_id),
@@ -5089,7 +5093,7 @@ pub extern "C" fn Servo_DeclarationBlock_SetKeywordValue(
     use style::values::generics::box_::{VerticalAlign, VerticalAlignKeyword};
     use style::values::generics::font::FontStyle;
     use style::values::specified::{
-        table::CaptionSide, BorderStyle, Clear, Display, Float, TextAlign, TextEmphasisPosition
+        table::CaptionSide, BorderStyle, Clear, Display, Float, TextAlign, TextEmphasisPosition,
     };
 
     fn get_from_computed<T>(value: u32) -> T
@@ -6995,8 +6999,8 @@ pub unsafe extern "C" fn Servo_ParseFontShorthandForMatching(
     size: Option<&mut f32>,
 ) -> bool {
     use style::properties::shorthands::font;
-    use style::values::specified::font as specified;
     use style::values::generics::font::FontStyle as GenericFontStyle;
+    use style::values::specified::font as specified;
 
     let string = value.as_str_unchecked();
     let mut input = ParserInput::new(&string);
@@ -7064,12 +7068,20 @@ pub unsafe extern "C" fn Servo_ParseFontShorthandForMatching(
             specified::FontSize::Keyword(info) => {
                 // TODO: Maybe get a meaningful quirks / base size from the caller?
                 let quirks_mode = QuirksMode::NoQuirks;
-                info.kw.to_length_without_context(quirks_mode, computed::Length::new(specified::FONT_MEDIUM_PX)).0.px()
-            }
+                info.kw
+                    .to_length_without_context(
+                        quirks_mode,
+                        computed::Length::new(specified::FONT_MEDIUM_PX),
+                    )
+                    .0
+                    .px()
+            },
             // smaller, larger not currently supported
-            specified::FontSize::Smaller | specified::FontSize::Larger | specified::FontSize::System(_) => {
+            specified::FontSize::Smaller |
+            specified::FontSize::Larger |
+            specified::FontSize::System(_) => {
                 return false;
-            }
+            },
         };
     }
 
@@ -7327,7 +7339,10 @@ pub extern "C" fn Servo_FontStretch_ToCss(s: &FontStretch, result: &mut nsACStri
 }
 
 #[no_mangle]
-pub extern "C" fn Servo_FontStretch_SerializeKeyword(s: &FontStretch, result: &mut nsACString) -> bool {
+pub extern "C" fn Servo_FontStretch_SerializeKeyword(
+    s: &FontStretch,
+    result: &mut nsACString,
+) -> bool {
     let kw = match s.as_keyword() {
         Some(kw) => kw,
         None => return false,
@@ -7488,7 +7503,7 @@ pub extern "C" fn Servo_InterpolateColor(
 pub extern "C" fn Servo_EasingFunctionAt(
     easing_function: &ComputedTimingFunction,
     progress: f64,
-    before_flag: BeforeFlag
+    before_flag: BeforeFlag,
 ) -> f64 {
     easing_function.calculate_output(progress, before_flag, 1e-7)
 }
diff --git a/servo/ports/geckolib/tests/piecewise_linear.rs b/servo/ports/geckolib/tests/piecewise_linear.rs
index 57653ef673c8..53a905f7ab00 100644
--- a/servo/ports/geckolib/tests/piecewise_linear.rs
+++ b/servo/ports/geckolib/tests/piecewise_linear.rs
@@ -56,15 +56,9 @@ fn implied_input_spacing() {
         .push(0.0, None)
         .push(1.0, None)
         .build();
-    assert!(implied_spacing
-        .at(0.)
-        .approx_eq(&explicit_spacing.at(0.)));
-    assert!(implied_spacing
-        .at(0.5)
-        .approx_eq(&explicit_spacing.at(0.5)));
-    assert!(implied_spacing
-        .at(1.0)
-        .approx_eq(&explicit_spacing.at(1.0)));
+    assert!(implied_spacing.at(0.).approx_eq(&explicit_spacing.at(0.)));
+    assert!(implied_spacing.at(0.5).approx_eq(&explicit_spacing.at(0.5)));
+    assert!(implied_spacing.at(1.0).approx_eq(&explicit_spacing.at(1.0)));
 }
 
 #[test]
@@ -136,9 +130,7 @@ fn out_of_bounds_flat() {
         .push(1.0, Some(1.0))
         .push(1.0, Some(1.0))
         .build();
-    assert!(oob_flat
-        .at(0.0)
-        .approx_eq(&oob_flat.at(-0.25)));
+    assert!(oob_flat.at(0.0).approx_eq(&oob_flat.at(-0.25)));
     assert!(oob_flat.at(1.0).approx_eq(&oob_flat.at(1.25)));
 }