diff --git a/components/layout/construct.rs b/components/layout/construct.rs
index 5c9ff1256dd..aabb2e69b67 100644
--- a/components/layout/construct.rs
+++ b/components/layout/construct.rs
@@ -840,7 +840,10 @@ impl<'a, ConcreteThreadSafeLayoutNode: ThreadSafeLayoutNode>
 
         match text_content {
             TextContent::Text(string) => {
-                let info = Box::new(UnscannedTextFragmentInfo::new(string, node.selection()));
+                let info = Box::new(UnscannedTextFragmentInfo::new(
+                    string.into(),
+                    node.selection(),
+                ));
                 let specific_fragment_info = SpecificFragmentInfo::UnscannedText(info);
                 fragments
                     .fragments
@@ -857,7 +860,8 @@ impl<'a, ConcreteThreadSafeLayoutNode: ThreadSafeLayoutNode>
                 for content_item in content_items.into_iter() {
                     let specific_fragment_info = match content_item {
                         ContentItem::String(string) => {
-                            let info = Box::new(UnscannedTextFragmentInfo::new(string, None));
+                            let info =
+                                Box::new(UnscannedTextFragmentInfo::new(string.into(), None));
                             SpecificFragmentInfo::UnscannedText(info)
                         },
                         content_item => {
diff --git a/components/layout/display_list/conversions.rs b/components/layout/display_list/conversions.rs
index 2759c5f65ac..ecf20be3869 100644
--- a/components/layout/display_list/conversions.rs
+++ b/components/layout/display_list/conversions.rs
@@ -95,7 +95,7 @@ impl ToLayout for TransformStyle {
     type Type = wr::TransformStyle;
     fn to_layout(&self) -> Self::Type {
         match *self {
-            TransformStyle::Auto | TransformStyle::Flat => wr::TransformStyle::Flat,
+            TransformStyle::Flat => wr::TransformStyle::Flat,
             TransformStyle::Preserve3d => wr::TransformStyle::Preserve3D,
         }
     }
diff --git a/components/layout/table.rs b/components/layout/table.rs
index 190f6693256..80f5ac43032 100644
--- a/components/layout/table.rs
+++ b/components/layout/table.rs
@@ -309,7 +309,7 @@ impl Flow for TableFlow {
                         percentage: match *specified_inline_size {
                             Size::Auto => 0.0,
                             Size::LengthPercentage(ref lp) => {
-                                lp.0.as_percentage().map_or(0.0, |p| p.0)
+                                lp.0.to_percentage().map_or(0.0, |p| p.0)
                             },
                         },
                         preferred: Au(0),
diff --git a/components/layout/table_row.rs b/components/layout/table_row.rs
index 58fb40bde3a..0d959b7456c 100644
--- a/components/layout/table_row.rs
+++ b/components/layout/table_row.rs
@@ -437,7 +437,7 @@ impl Flow for TableRowFlow {
                     .unwrap_or(child_base.intrinsic_inline_sizes.minimum_inline_size),
                     percentage: match child_specified_inline_size {
                         Size::Auto => 0.0,
-                        Size::LengthPercentage(ref lp) => lp.0.as_percentage().map_or(0.0, |p| p.0),
+                        Size::LengthPercentage(ref lp) => lp.0.to_percentage().map_or(0.0, |p| p.0),
                     },
                     preferred: child_base.intrinsic_inline_sizes.preferred_inline_size,
                     constrained: match child_specified_inline_size {
diff --git a/components/layout_2020/sizing.rs b/components/layout_2020/sizing.rs
index dc7513a7859..676c7eb347a 100644
--- a/components/layout_2020/sizing.rs
+++ b/components/layout_2020/sizing.rs
@@ -117,12 +117,12 @@ impl BoxContentSizes {
             .auto_is(Length::zero);
         let max_inline_size = match style.max_box_size().inline {
             MaxSize::None => None,
-            MaxSize::LengthPercentage(ref lp) => lp.as_length(),
+            MaxSize::LengthPercentage(ref lp) => lp.to_length(),
         };
         let clamp = |l: Length| l.clamp_between_extremums(min_inline_size, max_inline_size);
 
         // Percentages for 'width' are treated as 'auto'
-        let inline_size = inline_size.map(|lp| lp.as_length());
+        let inline_size = inline_size.map(|lp| lp.to_length());
         // The (inner) min/max-content are only used for 'auto'
         let mut outer = match inline_size.non_auto().flatten() {
             None => {
diff --git a/components/layout_2020/style_ext.rs b/components/layout_2020/style_ext.rs
index f6fb8d4000a..30b384f3884 100644
--- a/components/layout_2020/style_ext.rs
+++ b/components/layout_2020/style_ext.rs
@@ -59,7 +59,7 @@ impl ComputedValuesExt for ComputedValues {
         } else {
             &position.height
         };
-        matches!(size, Size::LengthPercentage(lp) if lp.0.as_length().is_some())
+        matches!(size, Size::LengthPercentage(lp) if lp.0.to_length().is_some())
     }
 
     fn inline_box_offsets_are_both_non_auto(&self) -> bool {
diff --git a/components/style/properties/properties.mako.rs b/components/style/properties/properties.mako.rs
index 1962bba3a53..d3e61867518 100644
--- a/components/style/properties/properties.mako.rs
+++ b/components/style/properties/properties.mako.rs
@@ -2902,6 +2902,7 @@ pub struct ComputedValues {
 
 impl ComputedValues {
     /// Returns the pseudo-element that this style represents.
+    #[cfg(feature = "servo")]
     pub fn pseudo(&self) -> Option<<&PseudoElement> {
         self.pseudo.as_ref()
     }
diff --git a/components/style/rule_tree/mod.rs b/components/style/rule_tree/mod.rs
index c726e6fbff7..9def9108046 100644
--- a/components/style/rule_tree/mod.rs
+++ b/components/style/rule_tree/mod.rs
@@ -1718,6 +1718,7 @@ impl Clone for StrongRuleNode {
 }
 
 impl Drop for StrongRuleNode {
+    #[cfg_attr(feature = "servo", allow(unused_mut))]
     fn drop(&mut self) {
         let node = unsafe { &*self.ptr() };
 
diff --git a/components/style/values/computed/length_percentage.rs b/components/style/values/computed/length_percentage.rs
index 6851bc0c674..7c1e831f7df 100644
--- a/components/style/values/computed/length_percentage.rs
+++ b/components/style/values/computed/length_percentage.rs
@@ -378,6 +378,19 @@ impl LengthPercentage {
         }
     }
 
+    /// Converts to a `<percentage>` if possible.
+    #[inline]
+    pub fn to_percentage(&self) -> Option<Percentage> {
+        match self.unpack() {
+            Unpacked::Length(..) => None,
+            Unpacked::Percentage(p) => Some(p),
+            Unpacked::Calc(ref c) => {
+                debug_assert!(!c.length.is_zero());
+                None
+            }
+        }
+    }
+
     /// Return the specified percentage if any.
     #[inline]
     pub fn specified_percentage(&self) -> Option<Percentage> {
@@ -405,7 +418,7 @@ impl LengthPercentage {
 
     /// Convert the computed value into used value.
     #[inline]
-    fn maybe_to_used_value(&self, container_len: Option<Length>) -> Option<Au> {
+    pub fn maybe_to_used_value(&self, container_len: Option<Length>) -> Option<Au> {
         self.maybe_percentage_relative_to(container_len).map(Au::from)
     }
 
diff --git a/components/style/values/generics/counters.rs b/components/style/values/generics/counters.rs
index 9ed8cdba68b..88c83f87357 100644
--- a/components/style/values/generics/counters.rs
+++ b/components/style/values/generics/counters.rs
@@ -168,8 +168,9 @@ pub enum GenericContent<ImageUrl> {
 pub use self::GenericContent as Content;
 
 impl<ImageUrl> Content<ImageUrl> {
+    /// Whether `self` represents list of items.
     #[inline]
-    pub(crate) fn is_items(&self) -> bool {
+    pub fn is_items(&self) -> bool {
         matches!(*self, Self::Items(..))
     }
 
diff --git a/components/style/values/specified/counters.rs b/components/style/values/specified/counters.rs
index 15898b58f47..0849cc19116 100644
--- a/components/style/values/specified/counters.rs
+++ b/components/style/values/specified/counters.rs
@@ -113,6 +113,7 @@ impl Parse for Content {
     // normal | none | [ <string> | <counter> | open-quote | close-quote | no-open-quote |
     // no-close-quote ]+
     // TODO: <uri>, attr(<identifier>)
+    #[cfg_attr(feature = "servo", allow(unused_mut))]
     fn parse<'i, 't>(
         context: &ParserContext,
         input: &mut Parser<'i, 't>,
diff --git a/components/style_traits/owned_str.rs b/components/style_traits/owned_str.rs
index 42a83a07713..ebfdcd5e066 100644
--- a/components/style_traits/owned_str.rs
+++ b/components/style_traits/owned_str.rs
@@ -38,6 +38,34 @@ impl DerefMut for OwnedStr {
     }
 }
 
+impl OwnedStr {
+    /// Convert the OwnedStr into a boxed str.
+    #[inline]
+    pub fn into_box(self) -> Box<str> {
+        self.into_string().into_boxed_str()
+    }
+
+    /// Convert the OwnedStr into a `String`.
+    #[inline]
+    pub fn into_string(self) -> String {
+        unsafe { String::from_utf8_unchecked(self.0.into_vec()) }
+    }
+}
+
+impl From<OwnedStr> for String {
+    #[inline]
+    fn from(b: OwnedStr) -> Self {
+        b.into_string()
+    }
+}
+
+impl From<OwnedStr> for Box<str> {
+    #[inline]
+    fn from(b: OwnedStr) -> Self {
+        b.into_box()
+    }
+}
+
 impl From<Box<str>> for OwnedStr {
     #[inline]
     fn from(b: Box<str>) -> Self {