style: Move caption-side outside of mako.

Make it an enum class, etc.

Differential Revision: https://phabricator.services.mozilla.com/D103978

components/style/values/specified/table.rs

@@ -0,0 +1,45 @@
+/* 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/. */
+
+//! Specified types for CSS values related to tables.
+
+/// Specified values for the `caption-side` property.
+///
+/// Note that despite having "physical" names, these are actually interpreted
+/// according to the table's writing-mode: Top and Bottom are treated as
+/// block-start and -end respectively, and Left and Right are treated as
+/// line-start and -end.
+///
+/// https://drafts.csswg.org/css-tables/#propdef-caption-side
+#[allow(missing_docs)]
+#[derive(
+    Clone,
+    Copy,
+    Debug,
+    Eq,
+    FromPrimitive,
+    MallocSizeOf,
+    Ord,
+    Parse,
+    PartialEq,
+    PartialOrd,
+    SpecifiedValueInfo,
+    ToComputedValue,
+    ToCss,
+    ToResolvedValue,
+    ToShmem,
+)]
+#[repr(u8)]
+pub enum CaptionSide {
+    Top,
+    Bottom,
+    #[cfg(feature = "gecko")]
+    Right,
+    #[cfg(feature = "gecko")]
+    Left,
+    #[cfg(feature = "gecko")]
+    TopOutside,
+    #[cfg(feature = "gecko")]
+    BottomOutside,
+}