style: Make appearance: button behave like auto.

As per https://github.com/w3c/csswg-drafts/issues/5174.

Differential Revision: https://phabricator.services.mozilla.com/D89119

components/style/properties/data.py

@@ -334,7 +334,6 @@ class Longhand(object):
                 "BackgroundRepeat",
                 "BorderImageRepeat",
                 "BorderStyle",
-                "ButtonAppearance",
                 "Clear",
                 "ColumnCount",
                 "Contain",

components/style/properties/longhands/box.mako.rs

@@ -639,25 +639,6 @@ ${helpers.predefined_type(
     gecko_ffi_name="mDefaultAppearance",
 )}
 
-// A UA-sheet only property that controls the effect of `appearance: button`
-// on the element: `-moz-button-appearance: allow` means the element is rendered
-// with button appearance, and `-moz-button-appearance: disallow` is treated
-// like `appearance: auto`.
-//
-// https://github.com/w3c/csswg-drafts/issues/5174 proposes to simplify `button`
-// to mean `auto` unconditionally, at which point this property can be removed.
-${helpers.predefined_type(
-    "-moz-button-appearance",
-    "ButtonAppearance",
-    "computed::ButtonAppearance::Allow",
-    engines="gecko",
-    animation_value_type="none",
-    needs_context=False,
-    spec="Internal (not web-exposed)",
-    enabled_in="ua",
-    gecko_ffi_name="mButtonAppearance",
-)}
-
 ${helpers.single_keyword(
     "-moz-orient",
     "inline block horizontal vertical",

components/style/values/computed/box.rs

@@ -12,7 +12,7 @@ use crate::values::generics::box_::VerticalAlign as GenericVerticalAlign;
 use crate::values::specified::box_ as specified;
 
 pub use crate::values::specified::box_::{AnimationName, Appearance, BreakBetween, BreakWithin};
-pub use crate::values::specified::box_::{ButtonAppearance, Clear as SpecifiedClear};
+pub use crate::values::specified::box_::{Clear as SpecifiedClear};
 pub use crate::values::specified::box_::{Float as SpecifiedFloat, Contain, Display, Overflow};
 pub use crate::values::specified::box_::{OverflowAnchor, OverflowClipBox, OverscrollBehavior};
 pub use crate::values::specified::box_::{

components/style/values/computed/mod.rs

@@ -43,7 +43,7 @@ pub use self::border::{BorderCornerRadius, BorderRadius, BorderSpacing};
 pub use self::border::{BorderImageRepeat, BorderImageSideWidth};
 pub use self::border::{BorderImageSlice, BorderImageWidth};
 pub use self::box_::{AnimationIterationCount, AnimationName, Contain};
-pub use self::box_::{Appearance, BreakBetween, BreakWithin, ButtonAppearance, Clear, Float};
+pub use self::box_::{Appearance, BreakBetween, BreakWithin, Clear, Float};
 pub use self::box_::{Display, Overflow, OverflowAnchor, TransitionProperty};
 pub use self::box_::{OverflowClipBox, OverscrollBehavior, Perspective, Resize};
 pub use self::box_::{ScrollSnapAlign, ScrollSnapAxis, ScrollSnapStrictness, ScrollSnapType};

components/style/values/specified/box.rs

@@ -1844,31 +1844,6 @@ pub enum Appearance {
     Count,
 }
 
-/// The effect of `appearance: button` on an element.
-#[derive(
-    Clone,
-    Copy,
-    Debug,
-    Eq,
-    Hash,
-    MallocSizeOf,
-    Parse,
-    PartialEq,
-    SpecifiedValueInfo,
-    ToCss,
-    ToComputedValue,
-    ToResolvedValue,
-    ToShmem,
-)]
-#[repr(u8)]
-pub enum ButtonAppearance {
-    /// `appearance: button` means the element is rendered with button
-    /// appearance.
-    Allow,
-    /// `appearance: button` is treated like `appearance: auto`.
-    Disallow,
-}
-
 /// A kind of break between two boxes.
 ///
 /// https://drafts.csswg.org/css-break/#break-between

components/style/values/specified/mod.rs

@@ -37,7 +37,7 @@ pub use self::border::{BorderCornerRadius, BorderImageSlice, BorderImageWidth};
 pub use self::border::{BorderImageRepeat, BorderImageSideWidth};
 pub use self::border::{BorderRadius, BorderSideWidth, BorderSpacing, BorderStyle};
 pub use self::box_::{AnimationIterationCount, AnimationName, Contain, Display};
-pub use self::box_::{Appearance, BreakBetween, BreakWithin, ButtonAppearance};
+pub use self::box_::{Appearance, BreakBetween, BreakWithin};
 pub use self::box_::{Clear, Float, Overflow, OverflowAnchor};
 pub use self::box_::{OverflowClipBox, OverscrollBehavior, Perspective, Resize};
 pub use self::box_::{ScrollSnapAlign, ScrollSnapAxis, ScrollSnapStrictness, ScrollSnapType};