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diff --git a/servo/components/style/values/generics/counters.rs b/servo/components/style/values/generics/counters.rs
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+++ b/servo/components/style/values/generics/counters.rs
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+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at https://mozilla.org/MPL/2.0/. */
+
+//! Generic types for counters-related CSS values.
+
+#[cfg(feature = "servo-layout-2013")]
+use crate::computed_values::list_style_type::T as ListStyleType;
+#[cfg(feature = "gecko")]
+use crate::values::generics::CounterStyle;
+#[cfg(any(feature = "gecko", feature = "servo-layout-2020"))]
+use crate::values::specified::Attr;
+use crate::values::CustomIdent;
+use std::fmt::{self, Write};
+use std::ops::Deref;
+use style_traits::{CssWriter, ToCss};
+
+/// A name / value pair for counters.
+#[derive(
+    Clone,
+    Debug,
+    MallocSizeOf,
+    PartialEq,
+    SpecifiedValueInfo,
+    ToComputedValue,
+    ToResolvedValue,
+    ToShmem,
+)]
+#[repr(C)]
+pub struct GenericCounterPair<Integer> {
+    /// The name of the counter.
+    pub name: CustomIdent,
+    /// The value of the counter / increment / etc.
+    pub value: Integer,
+    /// If true, then this represents `reversed(name)`.
+    /// NOTE: It can only be true on `counter-reset` values.
+    pub is_reversed: bool,
+}
+pub use self::GenericCounterPair as CounterPair;
+
+impl<Integer> ToCss for CounterPair<Integer>
+where
+    Integer: ToCss + PartialEq<i32>,
+{
+    fn to_css<W>(&self, dest: &mut CssWriter<W>) -> fmt::Result
+    where
+        W: Write,
+    {
+        if self.is_reversed {
+            dest.write_str("reversed(")?;
+        }
+        self.name.to_css(dest)?;
+        if self.is_reversed {
+            dest.write_char(')')?;
+            if self.value == i32::min_value() {
+                return Ok(());
+            }
+        }
+        dest.write_char(' ')?;
+        self.value.to_css(dest)
+    }
+}
+
+/// A generic value for the `counter-increment` property.
+#[derive(
+    Clone,
+    Debug,
+    Default,
+    MallocSizeOf,
+    PartialEq,
+    SpecifiedValueInfo,
+    ToComputedValue,
+    ToCss,
+    ToResolvedValue,
+    ToShmem,
+)]
+#[repr(transparent)]
+pub struct GenericCounterIncrement<I>(#[css(field_bound)] pub GenericCounters<I>);
+pub use self::GenericCounterIncrement as CounterIncrement;
+
+impl<I> CounterIncrement<I> {
+    /// Returns a new value for `counter-increment`.
+    #[inline]
+    pub fn new(counters: Vec<CounterPair<I>>) -> Self {
+        CounterIncrement(Counters(counters.into()))
+    }
+}
+
+impl<I> Deref for CounterIncrement<I> {
+    type Target = [CounterPair<I>];
+
+    #[inline]
+    fn deref(&self) -> &Self::Target {
+        &(self.0).0
+    }
+}
+
+/// A generic value for the `counter-set` property.
+#[derive(
+    Clone,
+    Debug,
+    Default,
+    MallocSizeOf,
+    PartialEq,
+    SpecifiedValueInfo,
+    ToComputedValue,
+    ToCss,
+    ToResolvedValue,
+    ToShmem,
+)]
+#[repr(transparent)]
+pub struct GenericCounterSet<I>(#[css(field_bound)] pub GenericCounters<I>);
+pub use self::GenericCounterSet as CounterSet;
+
+impl<I> CounterSet<I> {
+    /// Returns a new value for `counter-set`.
+    #[inline]
+    pub fn new(counters: Vec<CounterPair<I>>) -> Self {
+        CounterSet(Counters(counters.into()))
+    }
+}
+
+impl<I> Deref for CounterSet<I> {
+    type Target = [CounterPair<I>];
+
+    #[inline]
+    fn deref(&self) -> &Self::Target {
+        &(self.0).0
+    }
+}
+
+/// A generic value for the `counter-reset` property.
+#[derive(
+    Clone,
+    Debug,
+    Default,
+    MallocSizeOf,
+    PartialEq,
+    SpecifiedValueInfo,
+    ToComputedValue,
+    ToCss,
+    ToResolvedValue,
+    ToShmem,
+)]
+#[repr(transparent)]
+pub struct GenericCounterReset<I>(#[css(field_bound)] pub GenericCounters<I>);
+pub use self::GenericCounterReset as CounterReset;
+
+impl<I> CounterReset<I> {
+    /// Returns a new value for `counter-reset`.
+    #[inline]
+    pub fn new(counters: Vec<CounterPair<I>>) -> Self {
+        CounterReset(Counters(counters.into()))
+    }
+}
+
+impl<I> Deref for CounterReset<I> {
+    type Target = [CounterPair<I>];
+
+    #[inline]
+    fn deref(&self) -> &Self::Target {
+        &(self.0).0
+    }
+}
+
+/// A generic value for lists of counters.
+///
+/// Keyword `none` is represented by an empty vector.
+#[derive(
+    Clone,
+    Debug,
+    Default,
+    MallocSizeOf,
+    PartialEq,
+    SpecifiedValueInfo,
+    ToComputedValue,
+    ToCss,
+    ToResolvedValue,
+    ToShmem,
+)]
+#[repr(transparent)]
+pub struct GenericCounters<I>(
+    #[css(field_bound)]
+    #[css(iterable, if_empty = "none")]
+    crate::OwnedSlice<GenericCounterPair<I>>,
+);
+pub use self::GenericCounters as Counters;
+
+#[cfg(feature = "servo-layout-2013")]
+type CounterStyleType = ListStyleType;
+
+#[cfg(feature = "gecko")]
+type CounterStyleType = CounterStyle;
+
+#[cfg(feature = "servo-layout-2013")]
+#[inline]
+fn is_decimal(counter_type: &CounterStyleType) -> bool {
+    *counter_type == ListStyleType::Decimal
+}
+
+#[cfg(feature = "gecko")]
+#[inline]
+fn is_decimal(counter_type: &CounterStyleType) -> bool {
+    *counter_type == CounterStyle::decimal()
+}
+
+/// The specified value for the `content` property.
+///
+/// https://drafts.csswg.org/css-content/#propdef-content
+#[derive(
+    Clone, Debug, Eq, MallocSizeOf, PartialEq, SpecifiedValueInfo, ToComputedValue, ToCss, ToShmem,
+)]
+#[repr(u8)]
+pub enum GenericContent<Image> {
+    /// `normal` reserved keyword.
+    Normal,
+    /// `none` reserved keyword.
+    None,
+    /// Content items.
+    Items(#[css(iterable)] crate::OwnedSlice<GenericContentItem<Image>>),
+}
+
+pub use self::GenericContent as Content;
+
+impl<Image> Content<Image> {
+    /// Whether `self` represents list of items.
+    #[inline]
+    pub fn is_items(&self) -> bool {
+        matches!(*self, Self::Items(..))
+    }
+
+    /// Set `content` property to `normal`.
+    #[inline]
+    pub fn normal() -> Self {
+        Content::Normal
+    }
+}
+
+/// Items for the `content` property.
+#[derive(
+    Clone,
+    Debug,
+    Eq,
+    MallocSizeOf,
+    PartialEq,
+    ToComputedValue,
+    SpecifiedValueInfo,
+    ToCss,
+    ToResolvedValue,
+    ToShmem,
+)]
+#[repr(u8)]
+pub enum GenericContentItem<I> {
+    /// Literal string content.
+    String(crate::OwnedStr),
+    /// `counter(name, style)`.
+    #[cfg(any(feature = "gecko", feature = "servo-layout-2013"))]
+    #[css(comma, function)]
+    Counter(CustomIdent, #[css(skip_if = "is_decimal")] CounterStyleType),
+    /// `counters(name, separator, style)`.
+    #[cfg(any(feature = "gecko", feature = "servo-layout-2013"))]
+    #[css(comma, function)]
+    Counters(
+        CustomIdent,
+        crate::OwnedStr,
+        #[css(skip_if = "is_decimal")] CounterStyleType,
+    ),
+    /// `open-quote`.
+    #[cfg(any(feature = "gecko", feature = "servo-layout-2013"))]
+    OpenQuote,
+    /// `close-quote`.
+    #[cfg(any(feature = "gecko", feature = "servo-layout-2013"))]
+    CloseQuote,
+    /// `no-open-quote`.
+    #[cfg(any(feature = "gecko", feature = "servo-layout-2013"))]
+    NoOpenQuote,
+    /// `no-close-quote`.
+    #[cfg(any(feature = "gecko", feature = "servo-layout-2013"))]
+    NoCloseQuote,
+    /// `-moz-alt-content`.
+    #[cfg(feature = "gecko")]
+    MozAltContent,
+    /// `-moz-label-content`.
+    /// This is needed to make `accesskey` work for XUL labels. It's basically
+    /// attr(value) otherwise.
+    #[cfg(feature = "gecko")]
+    MozLabelContent,
+    /// `attr([namespace? `|`]? ident)`
+    #[cfg(any(feature = "gecko", feature = "servo-layout-2020"))]
+    Attr(Attr),
+    /// image-set(url) | url(url)
+    Image(I),
+}
+
+pub use self::GenericContentItem as ContentItem;