style: Clean up text-justify, and make distribute a parse-time alias

Since it's simpler, as discussed in the CSSWG issue.

Differential Revision: https://phabricator.services.mozilla.com/D111346

components/style/values/specified/mod.rs

@@ -90,7 +90,7 @@ pub use self::text::RubyPosition;
 pub use self::text::{InitialLetter, LetterSpacing, LineBreak, LineHeight, TextAlign};
 pub use self::text::{OverflowWrap, TextEmphasisPosition, TextEmphasisStyle, WordBreak};
 pub use self::text::{TextAlignKeyword, TextDecorationLine, TextOverflow, WordSpacing};
-pub use self::text::{TextDecorationLength, TextDecorationSkipInk, TextTransform};
+pub use self::text::{TextDecorationLength, TextDecorationSkipInk, TextJustify, TextTransform};
 pub use self::time::Time;
 pub use self::transform::{Rotate, Scale, Transform};
 pub use self::transform::{TransformOrigin, TransformStyle, Translate};

components/style/values/specified/text.rs

@@ -1001,6 +1001,33 @@ pub enum WordBreak {
     BreakWord,
 }
 
+/// Values for the `text-justify` CSS property.
+#[repr(u8)]
+#[derive(
+    Clone,
+    Copy,
+    Debug,
+    Eq,
+    MallocSizeOf,
+    Parse,
+    PartialEq,
+    SpecifiedValueInfo,
+    ToComputedValue,
+    ToCss,
+    ToResolvedValue,
+    ToShmem,
+)]
+#[allow(missing_docs)]
+pub enum TextJustify {
+    Auto,
+    None,
+    InterWord,
+    // See https://drafts.csswg.org/css-text-3/#valdef-text-justify-distribute
+    // and https://github.com/w3c/csswg-drafts/issues/6156 for the alias.
+    #[parse(aliases = "distribute")]
+    InterCharacter,
+}
+
 /// Values for the `line-break` property.
 #[repr(u8)]
 #[derive(