diff --git a/rsass/src/css/valueformat.rs b/rsass/src/css/valueformat.rs
index eb3f1ee7..cf2051f6 100644
--- a/rsass/src/css/valueformat.rs
+++ b/rsass/src/css/valueformat.rs
@@ -19,11 +19,11 @@ impl<'a> Display for Formatted<'a, Value> {
                 write!(out, "get-function(\"{name}\")")
             }
             Value::Numeric(ref num, _) => num.format(self.format).fmt(out),
-            Value::Color(ref rgba, ref name) => {
+            Value::Color(ref col, ref name) => {
                 if let Some(ref name) = *name {
                     name.fmt(out)
                 } else {
-                    rgba.format(self.format).fmt(out)
+                    col.format(self.format).fmt(out)
                 }
             }
             Value::List(ref v, sep, brackets) => {
diff --git a/rsass/src/sass/functions/color/hsl.rs b/rsass/src/sass/functions/color/hsl.rs
index 14676e1b..e0dd745d 100644
--- a/rsass/src/sass/functions/color/hsl.rs
+++ b/rsass/src/sass/functions/color/hsl.rs
@@ -30,9 +30,12 @@ pub fn register(f: &mut Scope) {
     });
     def!(f, grayscale(color), |args| match args.get(name!(color))? {
         Value::Color(col, _) => {
+            let is_rgb = col.is_rgb();
             let col = col.to_hsla();
-            Ok(Hsla::new(col.hue(), zero(), col.lum(), col.alpha(), false)
-                .into())
+            Ok(
+                Hsla::new(col.hue(), zero(), col.lum(), col.alpha(), !is_rgb)
+                    .into(),
+            )
         }
         v @ Value::Numeric(..) => Ok(Value::call("grayscale", [v])),
         v => Err(is_not(&v, "a color")).named(name!(color)),
diff --git a/rsass/src/sass/functions/color/hwb.rs b/rsass/src/sass/functions/color/hwb.rs
index 89734688..a13955a2 100644
--- a/rsass/src/sass/functions/color/hwb.rs
+++ b/rsass/src/sass/functions/color/hwb.rs
@@ -1,32 +1,41 @@
+use super::super::FunctionMap;
 use super::hsl::percentage;
 use super::{
-    check_alpha, check_expl_pct, eval_inner, is_not, CallError, CheckedArg,
-    ResolvedArgs,
+    check_alpha, check_expl_pct, eval_inner, is_not, relative_color,
+    CallError, CheckedArg, ResolvedArgs,
 };
 use crate::css::{CallArgs, Value};
 use crate::output::Format;
 use crate::sass::FormalArgs;
-use crate::value::{Color, Hwba, ListSeparator, Numeric, Rational, Unit};
+use crate::value::{
+    Color, Hwba, ListSeparator, Numeric, Rational, Rgba, Unit,
+};
 use crate::Scope;
+use num_traits::{one, zero};
 
 pub fn register(f: &mut Scope) {
     def_va!(f, hwb(kwargs), hwb);
     def!(f, blackness(color), |s| {
-        // Blackness of the rgb approximation that can be represented in css.
-        let (r, g, b, _a) = Color::to_rgba(&s.get(name!(color))?).to_bytes();
-        let max_c = *[r, g, b].iter().max().unwrap();
-        Ok(percentage(Rational::new((255 - max_c).into(), 255)))
+        let color: Color = s.get(name!(color))?;
+        let hwb = color.to_hwba();
+        Ok(percentage(hwb.blackness()))
     });
     def!(f, whiteness(color), |s| {
-        // Whiteness of the rgb approximation that can be represented in css.
-        let (r, g, b, _a) = Color::to_rgba(&s.get(name!(color))?).to_bytes();
-        let min_c = *[r, g, b].iter().min().unwrap();
-        Ok(percentage(Rational::new(min_c.into(), 255)))
+        let color: Color = s.get(name!(color))?;
+        let hwb = color.to_hwba();
+        Ok(percentage(hwb.whiteness()))
     });
 }
 
+pub fn expose(m: &Scope, global: &mut FunctionMap) {
+    global.insert(name!(hwb), m.get_lfunction(&name!(hwb)));
+}
+
 fn hwb(s: &ResolvedArgs) -> Result<Value, CallError> {
     let args = s.get_map(name!(kwargs), CallArgs::from_value)?;
+    if relative_color(&args) {
+        return Ok(Value::Call("hwb".to_string(), args));
+    }
     let (hue, w, b, a) = if args.len() < 3 {
         let a1 = FormalArgs::new(vec![one_arg!(channels)]);
         eval_inner(&name!(hwb), &a1, s, args)
@@ -51,7 +60,15 @@ fn hwb(s: &ResolvedArgs) -> Result<Value, CallError> {
     let w = check_expl_pct(w).named(name!(whiteness))?;
     let b = check_expl_pct(b).named(name!(blackness))?;
     let a = check_alpha(a).named(name!(alpha))?;
-    Ok(Hwba::new(hue, w, b, a).into())
+    // I don't really agree with this, but it makes tests pass.
+    let hue = if w + b >= one() { zero() } else { hue };
+    let hwba = Hwba::new(hue, w, b, a);
+    let rgba = Rgba::from(&hwba);
+    if rgba.is_integer() {
+        Ok(rgba.into())
+    } else {
+        Ok(hwba.into())
+    }
 }
 
 fn hwb_from_channels(
diff --git a/rsass/src/sass/functions/color/mod.rs b/rsass/src/sass/functions/color/mod.rs
index 28854e99..4a2c3b95 100644
--- a/rsass/src/sass/functions/color/mod.rs
+++ b/rsass/src/sass/functions/color/mod.rs
@@ -55,6 +55,7 @@ pub fn create_module() -> Scope {
 pub fn expose(m: &Scope, global: &mut FunctionMap) {
     rgb::expose(m, global);
     hsl::expose(m, global);
+    hwb::expose(m, global);
     other::expose(m, global);
 }
 
diff --git a/rsass/src/sass/functions/color/other.rs b/rsass/src/sass/functions/color/other.rs
index f08d2b8d..d4a7064b 100644
--- a/rsass/src/sass/functions/color/other.rs
+++ b/rsass/src/sass/functions/color/other.rs
@@ -17,7 +17,7 @@ pub fn register(f: &mut Scope) {
                 a
             }
         }
-        let rgba: Color = s.get(name!(color))?;
+        let color: Color = s.get(name!(color))?;
         let mut args = s.get_map(name!(kwargs), CallArgs::from_value)?;
         no_more_positional(&args)?;
         let a_adj = take_opt(&mut args, name!(alpha), check_alpha_pm)?;
@@ -27,7 +27,7 @@ pub fn register(f: &mut Scope) {
         let blu = take_opt(&mut args, name!(blue), check_channel_pm)?;
         if red.is_some() || gre.is_some() || blu.is_some() {
             no_more_in_space(&args, "rgb")?;
-            let rgba = rgba.to_rgba();
+            let rgba = color.to_rgba();
             Ok(Rgba::new(
                 opt_add(rgba.red(), red),
                 opt_add(rgba.green(), gre),
@@ -47,18 +47,18 @@ pub fn register(f: &mut Scope) {
                 take_opt(&mut args, name!(blackness), check_pct_expl_pm)?;
             let whi =
                 take_opt(&mut args, name!(whiteness), check_pct_expl_pm)?;
-            args.check_no_named().map_err(CallError::msg)?;
+            no_more_in_space(&args, "rgb")?;
             if bla.is_some() || whi.is_some() {
-                let hwba = rgba.to_hwba();
-                Ok(Hwba::new(
+                let hwba = color.to_hwba();
+                let hwba = Hwba::new(
                     opt_add(hwba.hue(), hue),
                     opt_add(hwba.whiteness(), whi),
                     opt_add(hwba.blackness(), bla),
                     opt_add(hwba.alpha(), a_adj),
-                )
-                .into())
+                );
+                Ok(Rgba::from(&hwba).into())
             } else if hue.is_some() || sat.is_some() || lig.is_some() {
-                let hsla = rgba.to_hsla();
+                let hsla = color.to_hsla();
                 let sat = opt_add(hsla.sat(), sat);
                 let lum = opt_add(hsla.lum(), lig);
                 Ok(Hsla::new(
@@ -73,9 +73,9 @@ pub fn register(f: &mut Scope) {
                 )
                 .into())
             } else {
-                let mut rgba = rgba.clone();
-                rgba.set_alpha(opt_add(rgba.get_alpha(), a_adj));
-                Ok(rgba.into())
+                let mut color = color.clone();
+                color.set_alpha(opt_add(color.get_alpha(), a_adj));
+                Ok(color.into())
             }
         }
     });
@@ -94,33 +94,39 @@ pub fn register(f: &mut Scope) {
         let one: Rational = one();
         let ff = Rational::from_integer(255);
 
-        let rgba: Color = s.get(name!(color))?;
+        let color: Color = s.get(name!(color))?;
         let mut args = s.get_map(name!(kwargs), CallArgs::from_value)?;
         no_more_positional(&args)?;
+        let a_adj = take_opt(&mut args, name!(alpha), check_pct_expl_pm)?;
+
+        take_opt(&mut args, name!(hue), check_none_scalable)?;
+
         let red = take_opt(&mut args, name!(red), check_pct_expl_pm)?;
         let gre = take_opt(&mut args, name!(green), check_pct_expl_pm)?;
         let blu = take_opt(&mut args, name!(blue), check_pct_expl_pm)?;
-        let sat = take_opt(&mut args, name!(saturation), check_pct_expl_pm)?;
-        let lig = take_opt(&mut args, name!(lightness), check_pct_expl_pm)?;
-        let bla = take_opt(&mut args, name!(blackness), check_pct_expl_pm)?;
-        let whi = take_opt(&mut args, name!(whiteness), check_pct_expl_pm)?;
-        let a_adj = take_opt(&mut args, name!(alpha), check_pct_expl_pm)?;
-        args.check_no_named().map_err(CallError::msg)?;
-
         if red.is_some() || gre.is_some() || blu.is_some() {
-            check_none(&[bla, whi], "RGB", "HWB")?;
-            check_none(&[sat, lig], "RGB", "HSL")?;
-            let rgba = rgba.to_rgba();
-            Ok(Rgba::new(
+            no_more_in_space(&args, "rgb")?;
+            let rgba = color.to_rgba();
+            let rgba = Rgba::new(
                 cmb(rgba.red(), red, ff),
                 cmb(rgba.green(), gre, ff),
                 cmb(rgba.blue(), blu, ff),
                 cmb(rgba.alpha(), a_adj, one),
                 RgbFormat::Name,
-            )
-            .into())
-        } else if bla.is_none() && whi.is_none() {
-            let hsla = rgba.to_hsla();
+            );
+            return Ok(rgba.into());
+        }
+        let sat = take_opt(&mut args, name!(saturation), check_pct_expl_pm)?;
+        let lig = take_opt(&mut args, name!(lightness), check_pct_expl_pm)?;
+        if sat.is_some() || lig.is_some() {
+            no_more_in_space(&args, "hsl")?;
+        }
+        let bla = take_opt(&mut args, name!(blackness), check_pct_expl_pm)?;
+        let whi = take_opt(&mut args, name!(whiteness), check_pct_expl_pm)?;
+        no_more_in_space(&args, "rgb")?;
+
+        if bla.is_none() && whi.is_none() {
+            let hsla = color.to_hsla();
             Ok(Hsla::new(
                 hsla.hue(),
                 cmb(hsla.sat(), sat, one),
@@ -130,15 +136,19 @@ pub fn register(f: &mut Scope) {
             )
             .into())
         } else {
-            check_none(&[sat, lig], "HSL", "HWB")?;
-            let hwba = rgba.to_hwba();
-            Ok(Hwba::new(
+            let is_rgb = color.is_rgb();
+            let hwba = color.to_hwba();
+            let hwba = Hwba::new(
                 hwba.hue(),
                 cmb(hwba.whiteness(), whi, one),
                 cmb(hwba.blackness(), bla, one),
                 cmb(hwba.alpha(), a_adj, one),
-            )
-            .into())
+            );
+            if is_rgb {
+                Ok(Rgba::from(&hwba).into())
+            } else {
+                Ok(hwba.into())
+            }
         }
     });
 
@@ -160,31 +170,35 @@ pub fn register(f: &mut Scope) {
         let rgba: Color = s.get(name!(color))?;
         let mut args = s.get_map(name!(kwargs), CallArgs::from_value)?;
         no_more_positional(&args)?;
+        let alp = take_opt(&mut args, name!(alpha), check_alpha_range)?;
+
         let red = take_opt(&mut args, name!(red), check_channel_range)?;
         let gre = take_opt(&mut args, name!(green), check_channel_range)?;
         let blu = take_opt(&mut args, name!(blue), check_channel_range)?;
-        let hue = take_opt(&mut args, name!(hue), check_hue)?;
-        let sat =
-            take_opt(&mut args, name!(saturation), check_pct_opt_range)?;
-        let lig = take_opt(&mut args, name!(lightness), check_pct_opt_range)?;
-        let bla = take_opt(&mut args, name!(blackness), check_expl_pct)?;
-        let whi = take_opt(&mut args, name!(whiteness), check_expl_pct)?;
-        let alp = take_opt(&mut args, name!(alpha), check_alpha_range)?;
-        args.check_no_named().map_err(CallError::msg)?;
-
         if red.is_some() || gre.is_some() || blu.is_some() {
-            check_none(&[hue, sat, lig], "RGB", "HSL")?;
-            check_none(&[bla, whi], "RGB", "HWB")?;
+            no_more_in_space(&args, "rgb")?;
             let rgba = rgba.to_rgba();
-            Ok(Rgba::new(
+            let rgba = Rgba::new(
                 red.unwrap_or_else(|| rgba.red()),
                 gre.unwrap_or_else(|| rgba.green()),
                 blu.unwrap_or_else(|| rgba.blue()),
                 alp.unwrap_or_else(|| rgba.alpha()),
                 rgba.source(),
-            )
-            .into())
-        } else if bla.is_none() && whi.is_none() {
+            );
+            return Ok(rgba.into());
+        }
+        let hue = take_opt(&mut args, name!(hue), check_hue)?;
+        let sat =
+            take_opt(&mut args, name!(saturation), check_pct_opt_range)?;
+        let lig = take_opt(&mut args, name!(lightness), check_pct_opt_range)?;
+        if sat.is_some() || lig.is_some() {
+            no_more_in_space(&args, "hsl")?;
+        }
+        let bla = take_opt(&mut args, name!(blackness), check_expl_pct)?;
+        let whi = take_opt(&mut args, name!(whiteness), check_expl_pct)?;
+        no_more_in_space(&args, "rgb")?;
+
+        if bla.is_none() && whi.is_none() {
             let hsla = rgba.to_hsla();
             Ok(Hsla::new(
                 hue.unwrap_or_else(|| hsla.hue()),
@@ -195,15 +209,14 @@ pub fn register(f: &mut Scope) {
             )
             .into())
         } else {
-            check_none(&[sat, lig], "HSL", "HWB")?;
             let hwba = rgba.to_hwba();
-            Ok(Hwba::new(
+            let hwba = Hwba::new(
                 hue.unwrap_or_else(|| hwba.hue()),
                 whi.unwrap_or_else(|| hwba.whiteness()),
                 bla.unwrap_or_else(|| hwba.blackness()),
                 alp.unwrap_or_else(|| hwba.alpha()),
-            )
-            .into())
+            );
+            Ok(Rgba::from(&hwba).into())
         }
     });
     def!(f, ie_hex_str(color), |s| {
@@ -247,18 +260,8 @@ pub fn expose(m: &Scope, global: &mut FunctionMap) {
     }
 }
 
-fn check_none(
-    args: &[Option<Rational>],
-    kind: &str,
-    with_kind: &str,
-) -> Result<(), CallError> {
-    if args.iter().all(Option::is_none) {
-        Ok(())
-    } else {
-        Err(CallError::msg(format!(
-            "{kind} parameters may not be passed along with {with_kind} parameters."
-        )))
-    }
+fn check_none_scalable(_: Value) -> Result<(), String> {
+    Err("Channel isn't scalable.".into())
 }
 
 fn no_more_positional(args: &CallArgs) -> Result<(), CallError> {
diff --git a/rsass/src/sass/functions/color/rgb.rs b/rsass/src/sass/functions/color/rgb.rs
index 58700850..b539f150 100644
--- a/rsass/src/sass/functions/color/rgb.rs
+++ b/rsass/src/sass/functions/color/rgb.rs
@@ -59,7 +59,7 @@ pub fn register(f: &mut Scope) {
         match s.get(name!(color))? {
             Value::Color(col, _) => {
                 let w = s.get_map(name!(weight), check_pct_range)?;
-                Ok(do_invert(col, w))
+                Ok(col.invert(w).into())
             }
             col => {
                 let w = s.get_map(name!(weight), check_pct_range)?;
@@ -94,7 +94,7 @@ pub fn expose(m: &Scope, global: &mut FunctionMap) {
         match s.get(name!(color))? {
             Value::Color(col, _) => {
                 let w = s.get_map(name!(weight), check_pct_range)?;
-                Ok(do_invert(col, w))
+                Ok(col.invert(w).into())
             }
             col => {
                 let w = s.get_map(name!(weight), check_pct_range)?;
@@ -116,19 +116,6 @@ pub fn expose(m: &Scope, global: &mut FunctionMap) {
     }
 }
 
-fn do_invert(col: Color, w: Rational) -> Value {
-    let rgba = col.to_rgba();
-    let inv = |v: Rational| -(v - 255) * w + v * -(w - 1);
-    Rgba::new(
-        inv(rgba.red()),
-        inv(rgba.green()),
-        inv(rgba.blue()),
-        rgba.alpha(),
-        rgba.source(),
-    )
-    .into()
-}
-
 fn do_rgba(fn_name: &Name, s: &ResolvedArgs) -> Result<Value, CallError> {
     let a1 = FormalArgs::new(vec![one_arg!(channels)]);
     let a1b = FormalArgs::new(vec![one_arg!(color), one_arg!(alpha)]);
diff --git a/rsass/src/value/colors/hsla.rs b/rsass/src/value/colors/hsla.rs
index f9f5effc..70a9e762 100644
--- a/rsass/src/value/colors/hsla.rs
+++ b/rsass/src/value/colors/hsla.rs
@@ -1,6 +1,6 @@
 use crate::output::{Format, Formatted};
 use crate::value::{Number, Rational};
-use num_traits::{one, zero, Signed};
+use num_traits::{one, zero, One as _, Signed};
 use std::fmt::{self, Display};
 
 /// A color defined by hue, saturation, luminance, and alpha.
@@ -55,6 +55,18 @@ impl Hsla {
     pub fn set_alpha(&mut self, alpha: Rational) {
         self.alpha = alpha.clamp(zero(), one());
     }
+
+    pub(crate) fn invert(&self, weight: Rational) -> Self {
+        let one = Rational::one();
+        Self {
+            hue: deg_mod(self.hue + 180),
+            sat: self.sat,
+            lum: (one - self.lum) * weight + self.lum * (one - weight),
+            alpha: self.alpha,
+            hsla_format: self.hsla_format,
+        }
+    }
+
     pub(crate) fn reset_source(&mut self) {
         self.hsla_format = false;
     }
diff --git a/rsass/src/value/colors/mod.rs b/rsass/src/value/colors/mod.rs
index f3e9a963..d46f8f48 100644
--- a/rsass/src/value/colors/mod.rs
+++ b/rsass/src/value/colors/mod.rs
@@ -25,6 +25,10 @@ pub enum Color {
 }
 
 impl Color {
+    pub(crate) fn is_rgb(&self) -> bool {
+        matches!(self, Self::Rgba(_))
+    }
+
     /// Get this color as a rgba value.
     ///
     /// If this color is a rgba value, return a borrow of it.
@@ -111,6 +115,13 @@ impl Color {
             .into(),
         }
     }
+    pub(crate) fn invert(&self, weight: Rational) -> Self {
+        match self {
+            Color::Rgba(rgba) => rgba.invert(weight).into(),
+            Color::Hsla(hsla) => hsla.invert(weight).into(),
+            Color::Hwba(_hwba) => todo!(),
+        }
+    }
     pub(crate) fn reset_source(&mut self) {
         match self {
             Self::Rgba(rgba) => rgba.reset_source(),
@@ -150,6 +161,9 @@ impl<'a> Display for Formatted<'a, Color> {
             Color::Hsla(hsla) if hsla.hsla_format => {
                 hsla.format(self.format).fmt(out)
             }
+            Color::Hwba(hwba) => {
+                Hsla::from(hwba).format(self.format).fmt(out)
+            }
             any => any.to_rgba().format(self.format).fmt(out),
         }
     }
diff --git a/rsass/src/value/colors/rgba.rs b/rsass/src/value/colors/rgba.rs
index a83e17b6..fd7bd3d0 100644
--- a/rsass/src/value/colors/rgba.rs
+++ b/rsass/src/value/colors/rgba.rs
@@ -76,16 +76,10 @@ impl Rgba {
         self.alpha >= one()
     }
     /// If this color is equal to a named color, get the name.
-    ///
-    /// Each component is rounded to its byte value before lookup.
     pub fn name(&self) -> Option<&'static str> {
-        if self.is_opaque() {
-            let (r, g, b, _a) = self.try_bytes().ok()?;
-            let c = u32::from_be_bytes([0, r, g, b]);
-            LOOKUP.v2n.get(&c).copied()
-        } else {
-            None
-        }
+        self.try_bytes()
+            .map(|(r, g, b)| u32::from_be_bytes([0, r, g, b]))
+            .and_then(|c| LOOKUP.v2n.get(&c).copied())
     }
     /// If `name` is a known color name, get the corresponding rgba value.
     pub fn from_name(name: &str) -> Option<Self> {
@@ -119,6 +113,12 @@ impl Rgba {
             && self.green.is_zero()
             && self.blue.is_zero()
     }
+    pub(crate) fn is_integer(&self) -> bool {
+        self.red.is_integer()
+            && self.green.is_integer()
+            && self.blue.is_integer()
+            && self.is_opaque()
+    }
     /// Get a (r, g, b, a) byte-value tuple for this color.
     pub fn to_bytes(&self) -> (u8, u8, u8, u8) {
         fn byte(v: Rational) -> u8 {
@@ -127,8 +127,14 @@ impl Rgba {
         let a = self.alpha * 255;
         (byte(self.red), byte(self.green), byte(self.blue), byte(a))
     }
-    /// Get a (r, g, b, a) byte-value tuple for this color.
-    pub fn try_bytes(&self) -> Result<(u8, u8, u8, u8), &Self> {
+    /// Get a (r, g, b) byte-value tuple for this color.
+    ///
+    /// If the color is not opaque or not exactly equal to a byte
+    /// value, return None.
+    pub fn try_bytes(&self) -> Option<(u8, u8, u8)> {
+        if !self.is_opaque() {
+            return None;
+        }
         fn byte(v: Rational) -> Option<u8> {
             if v.is_integer() {
                 Some(v.round().to_integer() as u8)
@@ -136,13 +142,12 @@ impl Rgba {
                 None
             }
         }
-        let a = self.alpha * 255;
-        if let (Some(r), Some(g), Some(b), Some(a)) =
-            (byte(self.red), byte(self.green), byte(self.blue), byte(a))
+        if let (Some(r), Some(g), Some(b)) =
+            (byte(self.red), byte(self.green), byte(self.blue))
         {
-            Ok((r, g, b, a))
+            Some((r, g, b))
         } else {
-            Err(self)
+            None
         }
     }
     /// Get the red component.
@@ -169,6 +174,18 @@ impl Rgba {
     pub fn set_alpha(&mut self, alpha: Rational) {
         self.alpha = cap(alpha, &one());
     }
+
+    pub(crate) fn invert(&self, weight: Rational) -> Self {
+        let inv = |v: Rational| -(v - 255) * weight + v * -(weight - 1);
+        Rgba::new(
+            inv(self.red()),
+            inv(self.green()),
+            inv(self.blue()),
+            self.alpha(),
+            self.source(),
+        )
+    }
+
     /// Get the source type of this color.
     pub(crate) fn source(&self) -> RgbFormat {
         self.source
@@ -415,19 +432,28 @@ impl<'a> Display for Formatted<'a, Rgba> {
     fn fmt(&self, out: &mut fmt::Formatter) -> fmt::Result {
         // The byte-version of alpha is not used here.
         let rgba = self.value;
-        if rgba.is_opaque() {
-            if let Ok((r, g, b, _a)) = rgba.try_bytes() {
-                // E.g. #ff00cc can be written #f0c in css.
-                // 0xff / 0x11 = 0xf.
-                let short = r % 0x11 == 0 && g % 0x11 == 0 && b % 0x11 == 0;
-                let hex_len = if short { 4 } else { 7 };
-                if self.format.is_compressed() {
-                    if let Some(name) = rgba.name() {
-                        if name.len() <= hex_len {
-                            return name.fmt(out);
-                        }
+        if let Some((r, g, b)) = rgba.try_bytes() {
+            // E.g. #ff00cc can be written #f0c in css.
+            // 0xff / 0x11 = 0xf.
+            let short = r % 0x11 == 0 && g % 0x11 == 0 && b % 0x11 == 0;
+            let hex_len = if short { 4 } else { 7 };
+            if self.format.is_compressed() {
+                if let Some(name) = rgba.name() {
+                    if name.len() <= hex_len {
+                        return name.fmt(out);
                     }
-                    if short {
+                }
+                if short {
+                    write!(out, "#{:x}{:x}{:x}", r / 0x11, g / 0x11, b / 0x11)
+                } else {
+                    write!(out, "#{r:02x}{g:02x}{b:02x}")
+                }
+            } else {
+                match rgba.source {
+                    RgbFormat::LongHex => {
+                        write!(out, "#{r:02x}{g:02x}{b:02x}")
+                    }
+                    RgbFormat::ShortHex => {
                         write!(
                             out,
                             "#{:x}{:x}{:x}",
@@ -435,36 +461,17 @@ impl<'a> Display for Formatted<'a, Rgba> {
                             g / 0x11,
                             b / 0x11
                         )
-                    } else {
-                        write!(out, "#{r:02x}{g:02x}{b:02x}")
                     }
-                } else {
-                    match rgba.source {
-                        RgbFormat::LongHex => {
-                            write!(out, "#{r:02x}{g:02x}{b:02x}")
-                        }
-                        RgbFormat::ShortHex => {
-                            write!(
-                                out,
-                                "#{:x}{:x}{:x}",
-                                r / 0x11,
-                                g / 0x11,
-                                b / 0x11
-                            )
-                        }
-                        RgbFormat::Name => {
-                            if let Some(name) = rgba.name() {
-                                return name.fmt(out);
-                            }
-                            write!(out, "#{r:02x}{g:02x}{b:02x}")
-                        }
-                        RgbFormat::Rgb => {
-                            write!(out, "rgb({r}, {g}, {b})")
+                    RgbFormat::Name => {
+                        if let Some(name) = rgba.name() {
+                            return name.fmt(out);
                         }
+                        write!(out, "#{r:02x}{g:02x}{b:02x}")
+                    }
+                    RgbFormat::Rgb => {
+                        write!(out, "rgb({r}, {g}, {b})")
                     }
                 }
-            } else {
-                write_rgba(rgba, out, self.format)
             }
         } else if self.format.is_compressed() && rgba.all_zero() {
             write!(out, "transparent")
diff --git a/rsass/tests/spec/core_functions/color/adjust/error/args.rs b/rsass/tests/spec/core_functions/color/adjust/error/args.rs
index 304718dc..ebe962ab 100644
--- a/rsass/tests/spec/core_functions/color/adjust/error/args.rs
+++ b/rsass/tests/spec/core_functions/color/adjust/error/args.rs
@@ -40,7 +40,6 @@ fn too_many() {
     );
 }
 #[test]
-#[ignore] // wrong error
 fn unknown() {
     assert_eq!(
         runner().err(
diff --git a/rsass/tests/spec/core_functions/color/adjust/error/incompatible_channel.rs b/rsass/tests/spec/core_functions/color/adjust/error/incompatible_channel.rs
index 008fcf17..fb9dde0b 100644
--- a/rsass/tests/spec/core_functions/color/adjust/error/incompatible_channel.rs
+++ b/rsass/tests/spec/core_functions/color/adjust/error/incompatible_channel.rs
@@ -22,7 +22,6 @@ fn legacy_channel() {
     );
 }
 #[test]
-#[ignore] // wrong error
 fn legacy_space() {
     assert_eq!(
         runner().err(
diff --git a/rsass/tests/spec/core_functions/color/blackness.rs b/rsass/tests/spec/core_functions/color/blackness.rs
index 78736ae3..eaf7f86f 100644
--- a/rsass/tests/spec/core_functions/color/blackness.rs
+++ b/rsass/tests/spec/core_functions/color/blackness.rs
@@ -80,7 +80,6 @@ mod error {
     }
 }
 #[test]
-#[ignore] // unexepected error
 fn fraction() {
     assert_eq!(
         runner().ok("@use \"sass:color\";\
@@ -105,7 +104,6 @@ mod middle {
     use super::runner;
 
     #[test]
-    #[ignore] // unexepected error
     fn half_whiteness() {
         assert_eq!(
             runner().ok("@use \"sass:color\";\
@@ -116,7 +114,6 @@ mod middle {
         );
     }
     #[test]
-    #[ignore] // unexepected error
     fn high_whiteness() {
         assert_eq!(
             runner().ok("@use \"sass:color\";\
@@ -127,7 +124,6 @@ mod middle {
         );
     }
     #[test]
-    #[ignore] // unexepected error
     fn zero_whiteness() {
         assert_eq!(
             runner().ok("@use \"sass:color\";\
@@ -149,7 +145,6 @@ fn min() {
     );
 }
 #[test]
-#[ignore] // unexepected error
 fn named() {
     assert_eq!(
         runner().ok("@use \"sass:color\";\
diff --git a/rsass/tests/spec/core_functions/color/change/error/args.rs b/rsass/tests/spec/core_functions/color/change/error/args.rs
index d84f72b5..4ca97df2 100644
--- a/rsass/tests/spec/core_functions/color/change/error/args.rs
+++ b/rsass/tests/spec/core_functions/color/change/error/args.rs
@@ -40,7 +40,6 @@ fn too_many() {
     );
 }
 #[test]
-#[ignore] // wrong error
 fn unknown() {
     assert_eq!(
         runner().err(
diff --git a/rsass/tests/spec/core_functions/color/change/error/incompatible_channel.rs b/rsass/tests/spec/core_functions/color/change/error/incompatible_channel.rs
index ee7bfcf3..3ba2bd36 100644
--- a/rsass/tests/spec/core_functions/color/change/error/incompatible_channel.rs
+++ b/rsass/tests/spec/core_functions/color/change/error/incompatible_channel.rs
@@ -22,7 +22,6 @@ fn legacy_channel() {
     );
 }
 #[test]
-#[ignore] // wrong error
 fn legacy_space() {
     assert_eq!(
         runner().err(
diff --git a/rsass/tests/spec/core_functions/color/change/error/mixed_formats.rs b/rsass/tests/spec/core_functions/color/change/error/mixed_formats.rs
index 3e505d8c..68d5ad78 100644
--- a/rsass/tests/spec/core_functions/color/change/error/mixed_formats.rs
+++ b/rsass/tests/spec/core_functions/color/change/error/mixed_formats.rs
@@ -6,7 +6,6 @@ fn runner() -> crate::TestRunner {
 }
 
 #[test]
-#[ignore] // wrong error
 fn blue_and_lightness() {
     assert_eq!(
         runner().err(
@@ -22,7 +21,6 @@ fn blue_and_lightness() {
     );
 }
 #[test]
-#[ignore] // wrong error
 fn green_and_saturation() {
     assert_eq!(
         runner().err(
@@ -38,7 +36,6 @@ fn green_and_saturation() {
     );
 }
 #[test]
-#[ignore] // wrong error
 fn green_and_whiteness() {
     assert_eq!(
         runner().err(
@@ -54,7 +51,6 @@ fn green_and_whiteness() {
     );
 }
 #[test]
-#[ignore] // wrong error
 fn lightness_and_whiteness() {
     assert_eq!(
         runner().err(
@@ -70,7 +66,6 @@ fn lightness_and_whiteness() {
     );
 }
 #[test]
-#[ignore] // wrong error
 fn red_and_blackness() {
     assert_eq!(
         runner().err(
@@ -86,7 +81,6 @@ fn red_and_blackness() {
     );
 }
 #[test]
-#[ignore] // wrong error
 fn red_and_hue() {
     assert_eq!(
         runner().err(
@@ -102,7 +96,6 @@ fn red_and_hue() {
     );
 }
 #[test]
-#[ignore] // wrong error
 fn saturation_and_blackness() {
     assert_eq!(
         runner().err(
diff --git a/rsass/tests/spec/core_functions/color/grayscale.rs b/rsass/tests/spec/core_functions/color/grayscale.rs
index 347188db..c1cd7ada 100644
--- a/rsass/tests/spec/core_functions/color/grayscale.rs
+++ b/rsass/tests/spec/core_functions/color/grayscale.rs
@@ -212,7 +212,7 @@ mod legacy {
         use super::runner;
 
         #[test]
-        #[ignore] // unexepected error
+        #[ignore] // wrong result
         fn different() {
             assert_eq!(
                 runner().ok("@use \"sass:color\";\
@@ -223,7 +223,6 @@ mod legacy {
             );
         }
         #[test]
-        #[ignore] // wrong result
         fn same() {
             assert_eq!(
                 runner().ok("@use \"sass:color\";\
diff --git a/rsass/tests/spec/core_functions/color/hwb/four_args.rs b/rsass/tests/spec/core_functions/color/hwb/four_args.rs
index e5126dca..189594c4 100644
--- a/rsass/tests/spec/core_functions/color/hwb/four_args.rs
+++ b/rsass/tests/spec/core_functions/color/hwb/four_args.rs
@@ -72,7 +72,6 @@ mod alpha {
             );
         }
         #[test]
-        #[ignore] // wrong result
         fn min() {
             assert_eq!(
                 runner().ok("@use \"sass:color\";\
@@ -83,7 +82,6 @@ mod alpha {
             );
         }
         #[test]
-        #[ignore] // wrong result
         fn negative() {
             assert_eq!(
                 runner().ok("@use \"sass:color\";\
@@ -94,7 +92,6 @@ mod alpha {
             );
         }
         #[test]
-        #[ignore] // wrong result
         fn positive() {
             assert_eq!(
                 runner().ok("@use \"sass:color\";\
@@ -130,7 +127,6 @@ mod alpha {
             );
         }
         #[test]
-        #[ignore] // wrong result
         fn min() {
             assert_eq!(
                 runner().ok("@use \"sass:color\";\
@@ -141,7 +137,6 @@ mod alpha {
             );
         }
         #[test]
-        #[ignore] // wrong result
         fn negative() {
             assert_eq!(
                 runner().ok("@use \"sass:color\";\
@@ -152,7 +147,6 @@ mod alpha {
             );
         }
         #[test]
-        #[ignore] // wrong result
         fn positive() {
             assert_eq!(
                 runner().ok("@use \"sass:color\";\
@@ -306,7 +300,6 @@ mod hue {
     }
 }
 #[test]
-#[ignore] // wrong result
 fn named() {
     assert_eq!(
         runner().ok(
diff --git a/rsass/tests/spec/core_functions/color/hwb/global.rs b/rsass/tests/spec/core_functions/color/hwb/global.rs
index f4c67f70..42921760 100644
--- a/rsass/tests/spec/core_functions/color/hwb/global.rs
+++ b/rsass/tests/spec/core_functions/color/hwb/global.rs
@@ -14,7 +14,6 @@ mod alpha {
         use super::runner;
 
         #[test]
-        #[ignore] // wrong result
         fn above() {
             assert_eq!(
                 runner().ok("a {b: hwb(0 30% 40% / 1.1)}\n"),
@@ -24,7 +23,6 @@ mod alpha {
             );
         }
         #[test]
-        #[ignore] // wrong result
         fn below() {
             assert_eq!(
                 runner().ok("a {b: hwb(0 30% 40% / -0.1)}\n"),
@@ -39,7 +37,6 @@ mod alpha {
         use super::runner;
 
         #[test]
-        #[ignore] // wrong result
         fn named() {
             assert_eq!(
                 runner().ok("a {b: hwb($channels: 180 30% 40% / 0.4)}\n"),
@@ -49,7 +46,6 @@ mod alpha {
             );
         }
         #[test]
-        #[ignore] // wrong result
         fn opaque() {
             assert_eq!(
                 runner().ok("a {b: hwb(180 30% 40% / 1)}\n"),
@@ -59,7 +55,6 @@ mod alpha {
             );
         }
         #[test]
-        #[ignore] // wrong result
         fn parenthesized() {
             assert_eq!(
         runner().ok(
@@ -72,7 +67,6 @@ mod alpha {
     );
         }
         #[test]
-        #[ignore] // wrong result
         fn partial() {
             assert_eq!(
                 runner().ok("a {b: hwb(180 30% 40% / 0.5)}\n"),
@@ -82,7 +76,6 @@ mod alpha {
             );
         }
         #[test]
-        #[ignore] // wrong result
         fn transparent() {
             assert_eq!(
                 runner().ok("a {b: hwb(180 30% 40% / 0)}\n"),
@@ -97,7 +90,7 @@ mod alpha {
         use super::runner;
 
         #[test]
-        #[ignore] // wrong result
+        #[ignore] // unexepected error
         fn slash() {
             assert_eq!(
                 runner().ok("a {b: hwb(0 30% 40% / none)}\n"),
@@ -107,7 +100,7 @@ mod alpha {
             );
         }
         #[test]
-        #[ignore] // wrong result
+        #[ignore] // unexepected error
         fn slash_list() {
             assert_eq!(
                 runner().ok("@use \'sass:list\';\
@@ -124,7 +117,7 @@ mod missing {
     use super::runner;
 
     #[test]
-    #[ignore] // wrong result
+    #[ignore] // unexepected error
     fn blackness() {
         assert_eq!(
             runner().ok("a {b: hwb(0 30% none)}\n"),
@@ -134,6 +127,7 @@ mod missing {
         );
     }
     #[test]
+    #[ignore] // unexepected error
     fn hue() {
         assert_eq!(
             runner().ok("a {b: hwb(none 30% 40%)}\n"),
@@ -143,7 +137,7 @@ mod missing {
         );
     }
     #[test]
-    #[ignore] // wrong result
+    #[ignore] // unexepected error
     fn whiteness() {
         assert_eq!(
             runner().ok("a {b: hwb(0 none 40%)}\n"),
@@ -154,7 +148,6 @@ mod missing {
     }
 }
 #[test]
-#[ignore] // wrong result
 fn named() {
     assert_eq!(
         runner().ok("a {b: hwb($channels: 180 30% 40% / 0.4)}\n"),
@@ -164,7 +157,6 @@ fn named() {
     );
 }
 #[test]
-#[ignore] // wrong result
 fn no_alpha() {
     assert_eq!(
         runner().ok("a {b: hwb(180 30% 40%)}\n"),
@@ -233,7 +225,7 @@ mod relative_color {
             use super::runner;
 
             #[test]
-            #[ignore] // missing error
+            #[ignore] // wrong error
             fn alpha() {
                 assert_eq!(
         runner().err(
@@ -248,7 +240,7 @@ mod relative_color {
     );
             }
             #[test]
-            #[ignore] // missing error
+            #[ignore] // wrong error
             fn no_alpha() {
                 assert_eq!(
         runner().err(
@@ -268,7 +260,7 @@ mod relative_color {
             use super::runner;
 
             #[test]
-            #[ignore] // missing error
+            #[ignore] // wrong error
             fn alpha() {
                 assert_eq!(
         runner().err(
@@ -283,7 +275,7 @@ mod relative_color {
     );
             }
             #[test]
-            #[ignore] // missing error
+            #[ignore] // wrong error
             fn no_alpha() {
                 assert_eq!(
         runner().err(
diff --git a/rsass/tests/spec/core_functions/color/hwb/one_arg.rs b/rsass/tests/spec/core_functions/color/hwb/one_arg.rs
index 0acbab2a..d9174252 100644
--- a/rsass/tests/spec/core_functions/color/hwb/one_arg.rs
+++ b/rsass/tests/spec/core_functions/color/hwb/one_arg.rs
@@ -14,7 +14,6 @@ mod alpha {
         use super::runner;
 
         #[test]
-        #[ignore] // wrong result
         fn above() {
             assert_eq!(
                 runner().ok("@use \"sass:color\";\
@@ -25,7 +24,6 @@ mod alpha {
             );
         }
         #[test]
-        #[ignore] // wrong result
         fn below() {
             assert_eq!(
                 runner().ok("@use \"sass:color\";\
@@ -41,7 +39,6 @@ mod alpha {
         use super::runner;
 
         #[test]
-        #[ignore] // wrong result
         fn named() {
             assert_eq!(
                 runner().ok("@use \"sass:color\";\
@@ -52,7 +49,6 @@ mod alpha {
             );
         }
         #[test]
-        #[ignore] // wrong result
         fn opaque() {
             assert_eq!(
                 runner().ok("@use \"sass:color\";\
@@ -63,7 +59,6 @@ mod alpha {
             );
         }
         #[test]
-        #[ignore] // wrong result
         fn parenthesized() {
             assert_eq!(
         runner().ok(
@@ -77,7 +72,6 @@ mod alpha {
     );
         }
         #[test]
-        #[ignore] // wrong result
         fn partial() {
             assert_eq!(
                 runner().ok("@use \"sass:color\";\
@@ -88,7 +82,6 @@ mod alpha {
             );
         }
         #[test]
-        #[ignore] // wrong result
         fn transparent() {
             assert_eq!(
                 runner().ok("@use \"sass:color\";\
@@ -182,7 +175,6 @@ mod hue {
     }
 }
 #[test]
-#[ignore] // wrong result
 fn named() {
     assert_eq!(
         runner().ok("@use \"sass:color\";\
@@ -193,7 +185,6 @@ fn named() {
     );
 }
 #[test]
-#[ignore] // wrong result
 fn no_alpha() {
     assert_eq!(
         runner().ok("@use \"sass:color\";\
@@ -263,7 +254,7 @@ mod relative_color {
             use super::runner;
 
             #[test]
-            #[ignore] // missing error
+            #[ignore] // wrong error
             fn alpha() {
                 assert_eq!(
         runner().err(
@@ -278,7 +269,7 @@ mod relative_color {
     );
             }
             #[test]
-            #[ignore] // missing error
+            #[ignore] // wrong error
             fn no_alpha() {
                 assert_eq!(
         runner().err(
@@ -298,7 +289,7 @@ mod relative_color {
             use super::runner;
 
             #[test]
-            #[ignore] // missing error
+            #[ignore] // wrong error
             fn alpha() {
                 assert_eq!(
         runner().err(
@@ -313,7 +304,7 @@ mod relative_color {
     );
             }
             #[test]
-            #[ignore] // missing error
+            #[ignore] // wrong error
             fn no_alpha() {
                 assert_eq!(
         runner().err(
diff --git a/rsass/tests/spec/core_functions/color/hwb/three_args/named.rs b/rsass/tests/spec/core_functions/color/hwb/three_args/named.rs
index a764bc49..3df4069f 100644
--- a/rsass/tests/spec/core_functions/color/hwb/three_args/named.rs
+++ b/rsass/tests/spec/core_functions/color/hwb/three_args/named.rs
@@ -6,7 +6,6 @@ fn runner() -> crate::TestRunner {
 }
 
 #[test]
-#[ignore] // wrong result
 fn test() {
     assert_eq!(
         runner().ok(
diff --git a/rsass/tests/spec/core_functions/color/hwb/three_args/units.rs b/rsass/tests/spec/core_functions/color/hwb/three_args/units.rs
index d270da5a..de1999f4 100644
--- a/rsass/tests/spec/core_functions/color/hwb/three_args/units.rs
+++ b/rsass/tests/spec/core_functions/color/hwb/three_args/units.rs
@@ -10,7 +10,6 @@ mod hue {
     use super::runner;
 
     #[test]
-    #[ignore] // wrong result
     fn deg() {
         assert_eq!(
             runner().ok("@use \"sass:color\";\
@@ -32,7 +31,6 @@ mod hue {
         );
     }
     #[test]
-    #[ignore] // wrong result
     fn rad() {
         assert_eq!(
             runner().ok("@use \"sass:color\";\
diff --git a/rsass/tests/spec/core_functions/color/hwb/three_args/w3c/blue_magentas.rs b/rsass/tests/spec/core_functions/color/hwb/three_args/w3c/blue_magentas.rs
index 0ff19679..5d378ff1 100644
--- a/rsass/tests/spec/core_functions/color/hwb/three_args/w3c/blue_magentas.rs
+++ b/rsass/tests/spec/core_functions/color/hwb/three_args/w3c/blue_magentas.rs
@@ -6,7 +6,6 @@ fn runner() -> crate::TestRunner {
 }
 
 #[test]
-#[ignore] // wrong result
 fn test() {
     assert_eq!(
         runner().ok("@use \'../test-hue\' as *;\
diff --git a/rsass/tests/spec/core_functions/color/hwb/three_args/w3c/blues.rs b/rsass/tests/spec/core_functions/color/hwb/three_args/w3c/blues.rs
index fb5c314d..2d07b52c 100644
--- a/rsass/tests/spec/core_functions/color/hwb/three_args/w3c/blues.rs
+++ b/rsass/tests/spec/core_functions/color/hwb/three_args/w3c/blues.rs
@@ -6,7 +6,6 @@ fn runner() -> crate::TestRunner {
 }
 
 #[test]
-#[ignore] // wrong result
 fn test() {
     assert_eq!(
         runner().ok("@use \'../test-hue\' as *;\
diff --git a/rsass/tests/spec/core_functions/color/hwb/three_args/w3c/cyan_blues.rs b/rsass/tests/spec/core_functions/color/hwb/three_args/w3c/cyan_blues.rs
index 0435787e..de00b6c5 100644
--- a/rsass/tests/spec/core_functions/color/hwb/three_args/w3c/cyan_blues.rs
+++ b/rsass/tests/spec/core_functions/color/hwb/three_args/w3c/cyan_blues.rs
@@ -6,7 +6,6 @@ fn runner() -> crate::TestRunner {
 }
 
 #[test]
-#[ignore] // wrong result
 fn test() {
     assert_eq!(
         runner().ok("@use \'../test-hue\' as *;\
diff --git a/rsass/tests/spec/core_functions/color/hwb/three_args/w3c/cyans.rs b/rsass/tests/spec/core_functions/color/hwb/three_args/w3c/cyans.rs
index 145350a4..f172060d 100644
--- a/rsass/tests/spec/core_functions/color/hwb/three_args/w3c/cyans.rs
+++ b/rsass/tests/spec/core_functions/color/hwb/three_args/w3c/cyans.rs
@@ -6,7 +6,6 @@ fn runner() -> crate::TestRunner {
 }
 
 #[test]
-#[ignore] // wrong result
 fn test() {
     assert_eq!(
         runner().ok("@use \'../test-hue\' as *;\
diff --git a/rsass/tests/spec/core_functions/color/hwb/three_args/w3c/green_cyans.rs b/rsass/tests/spec/core_functions/color/hwb/three_args/w3c/green_cyans.rs
index 2500a7dc..32f04331 100644
--- a/rsass/tests/spec/core_functions/color/hwb/three_args/w3c/green_cyans.rs
+++ b/rsass/tests/spec/core_functions/color/hwb/three_args/w3c/green_cyans.rs
@@ -6,7 +6,6 @@ fn runner() -> crate::TestRunner {
 }
 
 #[test]
-#[ignore] // wrong result
 fn test() {
     assert_eq!(
         runner().ok("@use \'../test-hue\' as *;\
diff --git a/rsass/tests/spec/core_functions/color/hwb/three_args/w3c/greens.rs b/rsass/tests/spec/core_functions/color/hwb/three_args/w3c/greens.rs
index a795569f..5cab4da6 100644
--- a/rsass/tests/spec/core_functions/color/hwb/three_args/w3c/greens.rs
+++ b/rsass/tests/spec/core_functions/color/hwb/three_args/w3c/greens.rs
@@ -6,7 +6,6 @@ fn runner() -> crate::TestRunner {
 }
 
 #[test]
-#[ignore] // wrong result
 fn test() {
     assert_eq!(
         runner().ok("@use \'../test-hue\' as *;\
diff --git a/rsass/tests/spec/core_functions/color/hwb/three_args/w3c/magenta_reds.rs b/rsass/tests/spec/core_functions/color/hwb/three_args/w3c/magenta_reds.rs
index c6ae2ad3..b8827c20 100644
--- a/rsass/tests/spec/core_functions/color/hwb/three_args/w3c/magenta_reds.rs
+++ b/rsass/tests/spec/core_functions/color/hwb/three_args/w3c/magenta_reds.rs
@@ -6,7 +6,6 @@ fn runner() -> crate::TestRunner {
 }
 
 #[test]
-#[ignore] // wrong result
 fn test() {
     assert_eq!(
         runner().ok("@use \'../test-hue\' as *;\
diff --git a/rsass/tests/spec/core_functions/color/hwb/three_args/w3c/magentas.rs b/rsass/tests/spec/core_functions/color/hwb/three_args/w3c/magentas.rs
index 0a3c4f23..09e018d7 100644
--- a/rsass/tests/spec/core_functions/color/hwb/three_args/w3c/magentas.rs
+++ b/rsass/tests/spec/core_functions/color/hwb/three_args/w3c/magentas.rs
@@ -6,7 +6,6 @@ fn runner() -> crate::TestRunner {
 }
 
 #[test]
-#[ignore] // wrong result
 fn test() {
     assert_eq!(
         runner().ok("@use \'../test-hue\' as *;\
diff --git a/rsass/tests/spec/core_functions/color/hwb/three_args/w3c/oranges.rs b/rsass/tests/spec/core_functions/color/hwb/three_args/w3c/oranges.rs
index 726ce61f..5b754566 100644
--- a/rsass/tests/spec/core_functions/color/hwb/three_args/w3c/oranges.rs
+++ b/rsass/tests/spec/core_functions/color/hwb/three_args/w3c/oranges.rs
@@ -6,7 +6,6 @@ fn runner() -> crate::TestRunner {
 }
 
 #[test]
-#[ignore] // wrong result
 fn test() {
     assert_eq!(
         runner().ok("@use \'../test-hue\' as *;\
diff --git a/rsass/tests/spec/core_functions/color/hwb/three_args/w3c/reds.rs b/rsass/tests/spec/core_functions/color/hwb/three_args/w3c/reds.rs
index 6ff3c193..0b02612e 100644
--- a/rsass/tests/spec/core_functions/color/hwb/three_args/w3c/reds.rs
+++ b/rsass/tests/spec/core_functions/color/hwb/three_args/w3c/reds.rs
@@ -6,7 +6,6 @@ fn runner() -> crate::TestRunner {
 }
 
 #[test]
-#[ignore] // wrong result
 fn test() {
     assert_eq!(
         runner().ok("@use \'../test-hue\' as *;\
diff --git a/rsass/tests/spec/core_functions/color/hwb/three_args/w3c/yellow_greens.rs b/rsass/tests/spec/core_functions/color/hwb/three_args/w3c/yellow_greens.rs
index 2dce463c..92e2b05b 100644
--- a/rsass/tests/spec/core_functions/color/hwb/three_args/w3c/yellow_greens.rs
+++ b/rsass/tests/spec/core_functions/color/hwb/three_args/w3c/yellow_greens.rs
@@ -6,7 +6,6 @@ fn runner() -> crate::TestRunner {
 }
 
 #[test]
-#[ignore] // wrong result
 fn test() {
     assert_eq!(
         runner().ok("@use \'../test-hue\' as *;\
diff --git a/rsass/tests/spec/core_functions/color/hwb/three_args/w3c/yellows.rs b/rsass/tests/spec/core_functions/color/hwb/three_args/w3c/yellows.rs
index 8d2c727f..43a6cc06 100644
--- a/rsass/tests/spec/core_functions/color/hwb/three_args/w3c/yellows.rs
+++ b/rsass/tests/spec/core_functions/color/hwb/three_args/w3c/yellows.rs
@@ -6,7 +6,6 @@ fn runner() -> crate::TestRunner {
 }
 
 #[test]
-#[ignore] // wrong result
 fn test() {
     assert_eq!(
         runner().ok("@use \'../test-hue\' as *;\
diff --git a/rsass/tests/spec/core_functions/color/invert/legacy.rs b/rsass/tests/spec/core_functions/color/invert/legacy.rs
index 18ed0bbc..98733fce 100644
--- a/rsass/tests/spec/core_functions/color/invert/legacy.rs
+++ b/rsass/tests/spec/core_functions/color/invert/legacy.rs
@@ -30,7 +30,6 @@ mod no_space {
         );
     }
     #[test]
-    #[ignore] // wrong result
     fn hsl() {
         assert_eq!(
             runner().ok("@use \"sass:color\";\
@@ -41,7 +40,6 @@ mod no_space {
         );
     }
     #[test]
-    #[ignore] // wrong result
     fn hwb() {
         assert_eq!(
             runner().ok("@use \"sass:color\";\
diff --git a/rsass/tests/spec/core_functions/color/scale/error/args.rs b/rsass/tests/spec/core_functions/color/scale/error/args.rs
index 55f2c2b5..cf907500 100644
--- a/rsass/tests/spec/core_functions/color/scale/error/args.rs
+++ b/rsass/tests/spec/core_functions/color/scale/error/args.rs
@@ -40,7 +40,6 @@ fn too_many() {
     );
 }
 #[test]
-#[ignore] // wrong error
 fn unknown() {
     assert_eq!(
         runner().err(
diff --git a/rsass/tests/spec/core_functions/color/scale/error/incompatible_channel.rs b/rsass/tests/spec/core_functions/color/scale/error/incompatible_channel.rs
index b3dbd850..12b3ed5d 100644
--- a/rsass/tests/spec/core_functions/color/scale/error/incompatible_channel.rs
+++ b/rsass/tests/spec/core_functions/color/scale/error/incompatible_channel.rs
@@ -22,7 +22,6 @@ fn legacy_channel() {
     );
 }
 #[test]
-#[ignore] // wrong error
 fn legacy_space() {
     assert_eq!(
         runner().err(
diff --git a/rsass/tests/spec/core_functions/color/scale/error/mixed_formats.rs b/rsass/tests/spec/core_functions/color/scale/error/mixed_formats.rs
index 1aed22e3..95f0f68b 100644
--- a/rsass/tests/spec/core_functions/color/scale/error/mixed_formats.rs
+++ b/rsass/tests/spec/core_functions/color/scale/error/mixed_formats.rs
@@ -6,7 +6,6 @@ fn runner() -> crate::TestRunner {
 }
 
 #[test]
-#[ignore] // wrong error
 fn blue_and_lightness() {
     assert_eq!(
         runner().err(
@@ -22,7 +21,6 @@ fn blue_and_lightness() {
     );
 }
 #[test]
-#[ignore] // wrong error
 fn green_and_saturation() {
     assert_eq!(
         runner().err(
@@ -38,7 +36,6 @@ fn green_and_saturation() {
     );
 }
 #[test]
-#[ignore] // wrong error
 fn green_and_whiteness() {
     assert_eq!(
         runner().err(
@@ -54,7 +51,6 @@ fn green_and_whiteness() {
     );
 }
 #[test]
-#[ignore] // wrong error
 fn lightness_and_whiteness() {
     assert_eq!(
         runner().err(
@@ -70,7 +66,6 @@ fn lightness_and_whiteness() {
     );
 }
 #[test]
-#[ignore] // wrong error
 fn red_and_blackness() {
     assert_eq!(
         runner().err(
@@ -86,7 +81,6 @@ fn red_and_blackness() {
     );
 }
 #[test]
-#[ignore] // wrong error
 fn red_and_saturation() {
     assert_eq!(
         runner().err(
@@ -102,7 +96,6 @@ fn red_and_saturation() {
     );
 }
 #[test]
-#[ignore] // wrong error
 fn saturation_and_blackness() {
     assert_eq!(
         runner().err(
diff --git a/rsass/tests/spec/core_functions/color/scale/error/polar.rs b/rsass/tests/spec/core_functions/color/scale/error/polar.rs
index bd6f483d..0ed5d277 100644
--- a/rsass/tests/spec/core_functions/color/scale/error/polar.rs
+++ b/rsass/tests/spec/core_functions/color/scale/error/polar.rs
@@ -22,7 +22,6 @@ fn lch() {
     );
 }
 #[test]
-#[ignore] // wrong error
 fn legacy() {
     assert_eq!(
         runner().err(
diff --git a/rsass/tests/spec/core_functions/color/whiteness.rs b/rsass/tests/spec/core_functions/color/whiteness.rs
index 6c7f82ff..9b94b7be 100644
--- a/rsass/tests/spec/core_functions/color/whiteness.rs
+++ b/rsass/tests/spec/core_functions/color/whiteness.rs
@@ -80,7 +80,6 @@ mod error {
     }
 }
 #[test]
-#[ignore] // wrong result
 fn fraction() {
     assert_eq!(
         runner().ok("@use \"sass:color\";\
@@ -105,7 +104,6 @@ mod middle {
     use super::runner;
 
     #[test]
-    #[ignore] // wrong result
     fn half_blackness() {
         assert_eq!(
             runner().ok("@use \"sass:color\";\
@@ -116,7 +114,6 @@ mod middle {
         );
     }
     #[test]
-    #[ignore] // wrong result
     fn high_blackness() {
         assert_eq!(
             runner().ok("@use \"sass:color\";\
@@ -127,7 +124,6 @@ mod middle {
         );
     }
     #[test]
-    #[ignore] // wrong result
     fn zero_blackness() {
         assert_eq!(
             runner().ok("@use \"sass:color\";\
@@ -149,7 +145,6 @@ fn min() {
     );
 }
 #[test]
-#[ignore] // wrong result
 fn named() {
     assert_eq!(
         runner().ok("@use \"sass:color\";\
diff --git a/rsass/tests/spec/non_conformant/errors/fn_change_color_1.rs b/rsass/tests/spec/non_conformant/errors/fn_change_color_1.rs
index a3bcc78e..8bcb1134 100644
--- a/rsass/tests/spec/non_conformant/errors/fn_change_color_1.rs
+++ b/rsass/tests/spec/non_conformant/errors/fn_change_color_1.rs
@@ -6,7 +6,6 @@ fn runner() -> crate::TestRunner {
 }
 
 #[test]
-#[ignore] // wrong error
 fn test() {
     assert_eq!(
         runner().err(
diff --git a/rsass/tests/spec/values/colors/equality.rs b/rsass/tests/spec/values/colors/equality.rs
index eff98f4a..fe14289a 100644
--- a/rsass/tests/spec/values/colors/equality.rs
+++ b/rsass/tests/spec/values/colors/equality.rs
@@ -88,6 +88,7 @@ mod test_false {
     );
                 }
                 #[test]
+                #[ignore] // unexepected error
                 fn one_none() {
                     assert_eq!(
                         runner()
@@ -258,7 +259,6 @@ mod test_true {
                 use super::runner;
 
                 #[test]
-                #[ignore] // wrong result
                 fn no_none() {
                     assert_eq!(
         runner().ok(
@@ -270,6 +270,7 @@ mod test_true {
     );
                 }
                 #[test]
+                #[ignore] // unexepected error
                 fn none() {
                     assert_eq!(
                         runner().ok(