Move Position into its own values module

components/style/values/computed/position.rs

@@ -0,0 +1,28 @@
+/* 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 http://mozilla.org/MPL/2.0/. */
+
+//! CSS handling for the computed value of
+//! [`position`][position]s
+//!
+//! [position]: https://drafts.csswg.org/css-backgrounds-3/#position
+
+use cssparser::{Parser, ToCss, Token};
+use values::computed::{Length, LengthOrPercentage};
+use std::fmt;
+
+#[derive(Debug, Clone, PartialEq, Copy)]
+#[cfg_attr(feature = "servo", derive(HeapSizeOf))]
+pub struct Position {
+    pub horizontal: LengthOrPercentage,
+    pub vertical: LengthOrPercentage,
+}
+
+impl ToCss for Position {
+    fn to_css<W>(&self, dest: &mut W) -> fmt::Result where W: fmt::Write {
+        try!(self.horizontal.to_css(dest));
+        try!(dest.write_str(" "));
+        try!(self.vertical.to_css(dest));
+        Ok(())
+    }
+}