Adding upstream version 115.7.0esr.upstream/115.7.0esr

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

33 files changed, 4032 insertions, 0 deletions

diff --git a/servo/tests/unit/style/Cargo.toml b/servo/tests/unit/style/Cargo.toml
new file mode 100644
index 0000000000..55289f3659
--- /dev/null
+++ b/servo/tests/unit/style/Cargo.toml
@@ -0,0 +1,30 @@
+[package]
+name = "style_tests"
+version = "0.0.1"
+authors = ["The Servo Project Developers"]
+license = "MPL-2.0"
+
+[lib]
+name = "style_tests"
+path = "lib.rs"
+doctest = false
+
+[dependencies]
+byteorder = "1.0"
+app_units = "0.7"
+cssparser = "0.31"
+euclid = "0.22"
+html5ever = "0.22"
+parking_lot = "0.10"
+rayon = "1"
+serde_json = "1.0"
+selectors = {path = "../../../components/selectors"}
+servo_arc = {path = "../../../components/servo_arc"}
+servo_atoms = {path = "../../../components/atoms"}
+servo_config = {path = "../../../components/config"}
+servo_url = {path = "../../../components/url"}
+size_of_test = {path = "../../../components/size_of_test"}
+style = {path = "../../../components/style"}
+style_traits = {path = "../../../components/style_traits"}
+std_test_override = { path = "../../../components/std_test_override" }
+to_shmem = { path = "../../../components/to_shmem" }
diff --git a/servo/tests/unit/style/animated_properties.rs b/servo/tests/unit/style/animated_properties.rs
new file mode 100644
index 0000000000..fe0b03af87
--- /dev/null
+++ b/servo/tests/unit/style/animated_properties.rs
@@ -0,0 +1,169 @@
+/* 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/. */
+
+use cssparser::RGBA;
+use style::values::animated::{Animate, Procedure, ToAnimatedValue};
+use style::values::computed::Percentage;
+use style::values::generics::transform::{Transform, TransformOperation};
+
+fn interpolate_rgba(from: RGBA, to: RGBA, progress: f64) -> RGBA {
+    let from = from.to_animated_value();
+    let to = to.to_animated_value();
+    RGBA::from_animated_value(
+        from.animate(&to, Procedure::Interpolate { progress }).unwrap(),
+    )
+}
+
+// Color
+#[test]
+fn test_rgba_color_interepolation_preserves_transparent() {
+    assert_eq!(interpolate_rgba(RGBA::transparent(),
+                                RGBA::transparent(), 0.5),
+               RGBA::transparent());
+}
+
+#[test]
+fn test_rgba_color_interepolation_alpha() {
+    assert_eq!(interpolate_rgba(RGBA::new(200, 0, 0, 100),
+                                RGBA::new(0, 200, 0, 200), 0.5),
+               RGBA::new(67, 133, 0, 150));
+}
+
+#[test]
+fn test_rgba_color_interepolation_out_of_range_1() {
+    // Some cubic-bezier functions produce values that are out of range [0, 1].
+    // Unclamped cases.
+    assert_eq!(interpolate_rgba(RGBA::from_floats(0.3, 0.0, 0.0, 0.4),
+                                RGBA::from_floats(0.0, 1.0, 0.0, 0.6), -0.5),
+               RGBA::new(154, 0, 0, 77));
+}
+
+#[test]
+fn test_rgba_color_interepolation_out_of_range_2() {
+    assert_eq!(interpolate_rgba(RGBA::from_floats(1.0, 0.0, 0.0, 0.6),
+                                RGBA::from_floats(0.0, 0.3, 0.0, 0.4), 1.5),
+               RGBA::new(0, 154, 0, 77));
+}
+
+#[test]
+fn test_rgba_color_interepolation_out_of_range_clamped_1() {
+    assert_eq!(interpolate_rgba(RGBA::from_floats(1.0, 0.0, 0.0, 0.8),
+                                RGBA::from_floats(0.0, 1.0, 0.0, 0.2), -0.5),
+               RGBA::from_floats(1.0, 0.0, 0.0, 1.0));
+}
+
+#[test]
+fn test_rgba_color_interepolation_out_of_range_clamped_2() {
+    assert_eq!(interpolate_rgba(RGBA::from_floats(1.0, 0.0, 0.0, 0.8),
+                                RGBA::from_floats(0.0, 1.0, 0.0, 0.2), 1.5),
+               RGBA::from_floats(0.0, 0.0, 0.0, 0.0));
+}
+
+// Transform
+#[test]
+fn test_transform_interpolation_on_translate() {
+    use style::values::computed::{CalcLengthPercentage, Length, LengthPercentage};
+
+    let from = Transform(vec![
+        TransformOperation::Translate3D(LengthPercentage::Length(Length::new(0.)),
+                                        LengthPercentage::Length(Length::new(100.)),
+                                        Length::new(25.))]);
+    let to = Transform(vec![
+        TransformOperation::Translate3D(LengthPercentage::Length(Length::new(100.)),
+                                        LengthPercentage::Length(Length::new(0.)),
+                                        Length::new(75.))]);
+    assert_eq!(
+        from.animate(&to, Procedure::Interpolate { progress: 0.5 }).unwrap(),
+        Transform(vec![TransformOperation::Translate3D(
+            LengthPercentage::Length(Length::new(50.)),
+            LengthPercentage::Length(Length::new(50.)),
+            Length::new(50.),
+        )])
+    );
+
+    let from = Transform(vec![TransformOperation::Translate3D(
+        LengthPercentage::Percentage(Percentage(0.5)),
+        LengthPercentage::Percentage(Percentage(1.0)),
+        Length::new(25.),
+    )]);
+    let to = Transform(vec![
+        TransformOperation::Translate3D(LengthPercentage::Length(Length::new(100.)),
+                                        LengthPercentage::Length(Length::new(50.)),
+                                        Length::new(75.))]);
+    assert_eq!(
+        from.animate(&to, Procedure::Interpolate { progress: 0.5 }).unwrap(),
+        Transform(vec![TransformOperation::Translate3D(
+            // calc(50px + 25%)
+            LengthPercentage::Calc(CalcLengthPercentage::new(Length::new(50.),
+                                                                 Some(Percentage(0.25)))),
+            // calc(25px + 50%)
+            LengthPercentage::Calc(CalcLengthPercentage::new(Length::new(25.),
+                                                                 Some(Percentage(0.5)))),
+            Length::new(50.),
+        )])
+    );
+}
+
+#[test]
+fn test_transform_interpolation_on_scale() {
+    let from = Transform(vec![TransformOperation::Scale3D(1.0, 2.0, 1.0)]);
+    let to = Transform(vec![TransformOperation::Scale3D(2.0, 4.0, 2.0)]);
+    assert_eq!(
+        from.animate(&to, Procedure::Interpolate { progress: 0.5 }).unwrap(),
+        Transform(vec![TransformOperation::Scale3D(1.5, 3.0, 1.5)])
+    );
+}
+
+#[test]
+fn test_transform_interpolation_on_rotate() {
+    use style::values::computed::Angle;
+
+    let from = Transform(vec![TransformOperation::Rotate3D(0.0, 0.0, 1.0,
+                                                           Angle::from_radians(0.0))]);
+    let to = Transform(vec![TransformOperation::Rotate3D(0.0, 0.0, 1.0,
+                                                         Angle::from_radians(100.0))]);
+    assert_eq!(
+        from.animate(&to, Procedure::Interpolate { progress: 0.5 }).unwrap(),
+        Transform(vec![
+            TransformOperation::Rotate3D(0.0, 0.0, 1.0, Angle::from_radians(50.0)),
+        ])
+    );
+}
+
+#[test]
+fn test_transform_interpolation_on_skew() {
+    use style::values::computed::Angle;
+
+    let from = Transform(vec![TransformOperation::Skew(Angle::from_radians(0.0),
+                                                       Some(Angle::from_radians(100.0)))]);
+    let to = Transform(vec![TransformOperation::Skew(Angle::from_radians(100.0),
+                                                     Some(Angle::from_radians(0.0)))]);
+    assert_eq!(
+        from.animate(&to, Procedure::Interpolate { progress: 0.5 }).unwrap(),
+        Transform(vec![TransformOperation::Skew(
+            Angle::from_radians(50.0),
+            Some(Angle::from_radians(50.0)),
+        )])
+    );
+}
+
+#[test]
+fn test_transform_interpolation_on_mismatched_lists() {
+    use style::values::computed::{Angle, Length, LengthPercentage};
+
+    let from = Transform(vec![TransformOperation::Rotate3D(0.0, 0.0, 1.0,
+                                                           Angle::from_radians(100.0))]);
+    let to = Transform(vec![
+        TransformOperation::Translate3D(LengthPercentage::Length(Length::new(100.)),
+                                        LengthPercentage::Length(Length::new(0.)),
+                                        Length::new(0.))]);
+    assert_eq!(
+        from.animate(&to, Procedure::Interpolate { progress: 0.5 }).unwrap(),
+        Transform(vec![TransformOperation::InterpolateMatrix {
+            from_list: from.clone(),
+            to_list: to.clone(),
+            progress: Percentage(0.5),
+        }])
+    );
+}
diff --git a/servo/tests/unit/style/attr.rs b/servo/tests/unit/style/attr.rs
new file mode 100644
index 0000000000..b3164c4911
--- /dev/null
+++ b/servo/tests/unit/style/attr.rs
@@ -0,0 +1,88 @@
+/* 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/. */
+
+use app_units::Au;
+use style::attr::{AttrValue, LengthPercentageOrAuto, parse_length};
+use style::values::computed::{CalcLengthPercentage, Percentage};
+
+#[test]
+fn test_length_calc() {
+    let calc = CalcLengthPercentage::new(Au(10).into(), Some(Percentage(0.2)));
+    assert_eq!(calc.to_used_value(Some(Au(10))), Some(Au(12)));
+    assert_eq!(calc.to_used_value(Some(Au(0))), Some(Au(10)));
+    assert_eq!(calc.to_used_value(None), None);
+
+    let calc = CalcLengthPercentage::new(Au(10).into(), None);
+    assert_eq!(calc.to_used_value(Some(Au(0))), Some(Au(10)));
+    assert_eq!(calc.to_used_value(None), Some(Au(10)));
+}
+
+#[test]
+fn test_parse_double() {
+    let value = String::from("432.5e2");
+    match AttrValue::from_double(value, 0.0) {
+        AttrValue::Double(_, num) => assert_eq!(num, 43250f64),
+        _ => panic!("expected a double value")
+    }
+}
+
+#[test]
+fn test_parse_double_negative_prefix() {
+    let value = String::from("-5.6");
+    match AttrValue::from_double(value, 0.0) {
+        AttrValue::Double(_, num) => assert_eq!(num, -5.6f64),
+        _ => panic!("expected a double value")
+    }
+}
+
+#[test]
+fn test_parse_double_positive_prefix() {
+    let value = String::from("+5.6");
+    match AttrValue::from_double(value, 0.0) {
+        AttrValue::Double(_, num) => assert_eq!(num, 5.6f64),
+        _ => panic!("expected a double value")
+    }
+}
+
+#[test]
+fn test_from_limited_i32_should_be_default_when_less_than_0() {
+    let value = String::from("-1");
+    match AttrValue::from_limited_i32(value, 0) {
+        AttrValue::Int(_, 0) => (),
+        _ => panic!("expected an IndexSize error")
+    }
+}
+
+#[test]
+fn test_from_limited_i32_should_parse_a_uint_when_value_is_0_or_greater() {
+    match AttrValue::from_limited_i32(String::from("1"), 0) {
+        AttrValue::Int(_, 1) => (),
+        _ => panic!("expected an successful parsing")
+    }
+}
+
+#[test]
+fn test_from_limited_i32_should_keep_parsed_value_when_not_an_int() {
+    match AttrValue::from_limited_i32(String::from("parsed-value"), 0) {
+        AttrValue::Int(p, 0) => {
+            assert_eq!(p, String::from("parsed-value"))
+        },
+        _ => panic!("expected an successful parsing")
+    }
+}
+
+#[test]
+pub fn test_parse_length() {
+    fn check(input: &str, expected: LengthPercentageOrAuto) {
+        let parsed = parse_length(input);
+        assert_eq!(parsed, expected);
+    }
+
+    check("0", LengthPercentageOrAuto::Length(Au::from_px(0)));
+    check("0.000%", LengthPercentageOrAuto::Percentage(0.0));
+    check("+5.82%", LengthPercentageOrAuto::Percentage(0.0582));
+    check("5.82", LengthPercentageOrAuto::Length(Au::from_f64_px(5.82)));
+    check("invalid", LengthPercentageOrAuto::Auto);
+    check("12 followed by invalid", LengthPercentageOrAuto::Length(Au::from_px(12)));
+}
diff --git a/servo/tests/unit/style/custom_properties.rs b/servo/tests/unit/style/custom_properties.rs
new file mode 100644
index 0000000000..f04d4ff6b7
--- /dev/null
+++ b/servo/tests/unit/style/custom_properties.rs
@@ -0,0 +1,44 @@
+/* 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/. */
+
+use cssparser::{Parser, ParserInput};
+use servo_arc::Arc;
+use style::custom_properties::{Name, SpecifiedValue, CustomPropertiesMap, CustomPropertiesBuilder, CssEnvironment};
+use style::properties::CustomDeclarationValue;
+use test::{self, Bencher};
+
+fn cascade(
+    name_and_value: &[(&str, &str)],
+    inherited: Option<&Arc<CustomPropertiesMap>>,
+) -> Option<Arc<CustomPropertiesMap>> {
+    let values = name_and_value.iter().map(|&(name, value)| {
+        let mut input = ParserInput::new(value);
+        let mut parser = Parser::new(&mut input);
+        (Name::from(name), SpecifiedValue::parse(&mut parser).unwrap())
+    }).collect::<Vec<_>>();
+
+    let env = CssEnvironment;
+    let mut builder = CustomPropertiesBuilder::new(inherited, &env);
+
+    for &(ref name, ref val) in &values {
+        builder.cascade(name, &CustomDeclarationValue::Value(val.clone()));
+    }
+
+    builder.build()
+}
+
+#[bench]
+fn cascade_custom_simple(b: &mut Bencher) {
+    b.iter(|| {
+        let parent = cascade(&[
+            ("foo", "10px"),
+            ("bar", "100px"),
+        ], None);
+
+        test::black_box(cascade(&[
+            ("baz", "calc(40em + 4px)"),
+            ("bazz", "calc(30em + 4px)"),
+        ], parent.as_ref()))
+    })
+}
diff --git a/servo/tests/unit/style/lib.rs b/servo/tests/unit/style/lib.rs
new file mode 100644
index 0000000000..aa5a562d12
--- /dev/null
+++ b/servo/tests/unit/style/lib.rs
@@ -0,0 +1,36 @@
+/* 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/. */
+
+#![cfg(test)]
+#![feature(test)]
+
+extern crate app_units;
+extern crate cssparser;
+extern crate euclid;
+#[macro_use] extern crate html5ever;
+extern crate parking_lot;
+extern crate rayon;
+extern crate selectors;
+extern crate serde_json;
+extern crate servo_arc;
+extern crate servo_atoms;
+extern crate servo_config;
+extern crate servo_url;
+#[macro_use] extern crate style;
+extern crate style_traits;
+extern crate test;
+
+mod animated_properties;
+mod attr;
+mod custom_properties;
+mod logical_geometry;
+mod parsing;
+mod properties;
+mod rule_tree;
+mod size_of;
+mod specified_values;
+mod str;
+mod stylesheets;
+mod stylist;
+mod viewport;
diff --git a/servo/tests/unit/style/logical_geometry.rs b/servo/tests/unit/style/logical_geometry.rs
new file mode 100644
index 0000000000..8d6c06ec9a
--- /dev/null
+++ b/servo/tests/unit/style/logical_geometry.rs
@@ -0,0 +1,75 @@
+/* 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/. */
+
+use euclid::{Size2D, Point2D, SideOffsets2D, Rect};
+use style::logical_geometry::{WritingMode, LogicalSize, LogicalPoint, LogicalMargin, LogicalRect};
+
+#[cfg(test)]
+fn modes() -> Vec<WritingMode> {
+    vec![
+        WritingMode::empty(),
+        WritingMode::VERTICAL,
+        WritingMode::VERTICAL | WritingMode::VERTICAL_LR,
+        WritingMode::VERTICAL | WritingMode::VERTICAL_LR | WritingMode::VERTICAL_SIDEWAYS,
+        WritingMode::VERTICAL | WritingMode::VERTICAL_LR | WritingMode::TEXT_SIDEWAYS,
+        WritingMode::VERTICAL | WritingMode::VERTICAL_SIDEWAYS,
+        WritingMode::VERTICAL | WritingMode::TEXT_SIDEWAYS,
+        WritingMode::VERTICAL | WritingMode::UPRIGHT,
+        WritingMode::RTL,
+        WritingMode::VERTICAL | WritingMode::RTL,
+        WritingMode::VERTICAL | WritingMode::VERTICAL_LR | WritingMode::RTL,
+        WritingMode::VERTICAL | WritingMode::VERTICAL_LR | WritingMode::VERTICAL_SIDEWAYS | WritingMode::RTL,
+        WritingMode::VERTICAL | WritingMode::VERTICAL_LR | WritingMode::TEXT_SIDEWAYS | WritingMode::RTL,
+        WritingMode::VERTICAL | WritingMode::VERTICAL_LR | WritingMode::UPRIGHT | WritingMode::RTL,
+        WritingMode::VERTICAL | WritingMode::VERTICAL_SIDEWAYS | WritingMode::RTL,
+        WritingMode::VERTICAL | WritingMode::TEXT_SIDEWAYS | WritingMode::RTL,
+        WritingMode::VERTICAL | WritingMode::UPRIGHT | WritingMode::RTL,
+    ]
+}
+
+#[test]
+fn test_size_round_trip() {
+    let physical = Size2D::new(1u32, 2u32);
+    for &mode in modes().iter() {
+        let logical = LogicalSize::from_physical(mode, physical);
+        assert_eq!(logical.to_physical(mode), physical);
+        assert_eq!(logical.width(mode), 1);
+        assert_eq!(logical.height(mode), 2);
+    }
+}
+
+#[test]
+fn test_point_round_trip() {
+    let physical = Point2D::new(1u32, 2u32);
+    let container = Size2D::new(100, 200);
+    for &mode in modes().iter() {
+        let logical = LogicalPoint::from_physical(mode, physical, container);
+        assert_eq!(logical.to_physical(mode, container), physical);
+        assert_eq!(logical.x(mode, container), 1);
+        assert_eq!(logical.y(mode, container), 2);
+    }
+}
+
+#[test]
+fn test_margin_round_trip() {
+    let physical = SideOffsets2D::new(1u32, 2u32, 3u32, 4u32);
+    for &mode in modes().iter() {
+        let logical = LogicalMargin::from_physical(mode, physical);
+        assert_eq!(logical.to_physical(mode), physical);
+        assert_eq!(logical.top(mode), 1);
+        assert_eq!(logical.right(mode), 2);
+        assert_eq!(logical.bottom(mode), 3);
+        assert_eq!(logical.left(mode), 4);
+    }
+}
+
+#[test]
+fn test_rect_round_trip() {
+    let physical = Rect::new(Point2D::new(1u32, 2u32), Size2D::new(3u32, 4u32));
+    let container = Size2D::new(100, 200);
+    for &mode in modes().iter() {
+        let logical = LogicalRect::from_physical(mode, physical, container);
+        assert_eq!(logical.to_physical(mode, container), physical);
+    }
+}
diff --git a/servo/tests/unit/style/media_queries.rs b/servo/tests/unit/style/media_queries.rs
new file mode 100644
index 0000000000..eaa91e6ec4
--- /dev/null
+++ b/servo/tests/unit/style/media_queries.rs
@@ -0,0 +1,398 @@
+/* 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/. */
+
+use euclid::Scale;
+use euclid::Size2D;
+use servo_arc::Arc;
+use servo_url::ServoUrl;
+use std::borrow::ToOwned;
+use style::Atom;
+use style::context::QuirksMode;
+use style::media_queries::*;
+use style::servo::media_queries::*;
+use style::shared_lock::SharedRwLock;
+use style::stylesheets::{AllRules, Stylesheet, StylesheetInDocument, Origin, CssRule};
+use style::values::{CustomIdent, specified};
+use style_traits::ToCss;
+
+fn test_media_rule<F>(css: &str, callback: F)
+where
+    F: Fn(&MediaList, &str),
+{
+    let url = ServoUrl::parse("http://localhost").unwrap();
+    let css_str = css.to_owned();
+    let lock = SharedRwLock::new();
+    let media_list = Arc::new(lock.wrap(MediaList::empty()));
+    let stylesheet = Stylesheet::from_str(
+        css, url, Origin::Author, media_list, lock,
+        None, None, QuirksMode::NoQuirks, 0);
+    let dummy = Device::new(MediaType::screen(), Size2D::new(200.0, 100.0), Scale::new(1.0));
+    let mut rule_count = 0;
+    let guard = stylesheet.shared_lock.read();
+    for rule in stylesheet.iter_rules::<AllRules>(&dummy, &guard) {
+        if let CssRule::Media(ref lock) = *rule {
+            rule_count += 1;
+            callback(&lock.read_with(&guard).media_queries.read_with(&guard), css);
+        }
+    }
+    assert!(rule_count > 0, css_str);
+}
+
+fn media_query_test(device: &Device, css: &str, expected_rule_count: usize) {
+    let url = ServoUrl::parse("http://localhost").unwrap();
+    let lock = SharedRwLock::new();
+    let media_list = Arc::new(lock.wrap(MediaList::empty()));
+    let ss = Stylesheet::from_str(
+        css, url, Origin::Author, media_list, lock,
+        None, None, QuirksMode::NoQuirks, 0);
+    let mut rule_count = 0;
+    ss.effective_style_rules(device, &ss.shared_lock.read(), |_| rule_count += 1);
+    assert!(rule_count == expected_rule_count, css.to_owned());
+}
+
+#[test]
+fn test_mq_empty() {
+    test_media_rule("@media { }", |list, css| {
+        assert!(list.media_queries.len() == 0, css.to_owned());
+    });
+}
+
+#[test]
+fn test_mq_screen() {
+    test_media_rule("@media screen { }", |list, css| {
+        assert!(list.media_queries.len() == 1, css.to_owned());
+        let q = &list.media_queries[0];
+        assert!(q.qualifier == None, css.to_owned());
+        assert!(q.media_type == MediaQueryType::Concrete(MediaType::screen()), css.to_owned());
+        assert!(q.expressions.len() == 0, css.to_owned());
+    });
+
+    test_media_rule("@media only screen { }", |list, css| {
+        assert!(list.media_queries.len() == 1, css.to_owned());
+        let q = &list.media_queries[0];
+        assert!(q.qualifier == Some(Qualifier::Only), css.to_owned());
+        assert!(q.media_type == MediaQueryType::Concrete(MediaType::screen()), css.to_owned());
+        assert!(q.expressions.len() == 0, css.to_owned());
+    });
+
+    test_media_rule("@media not screen { }", |list, css| {
+        assert!(list.media_queries.len() == 1, css.to_owned());
+        let q = &list.media_queries[0];
+        assert!(q.qualifier == Some(Qualifier::Not), css.to_owned());
+        assert!(q.media_type == MediaQueryType::Concrete(MediaType::screen()), css.to_owned());
+        assert!(q.expressions.len() == 0, css.to_owned());
+    });
+}
+
+#[test]
+fn test_mq_print() {
+    test_media_rule("@media print { }", |list, css| {
+        assert!(list.media_queries.len() == 1, css.to_owned());
+        let q = &list.media_queries[0];
+        assert!(q.qualifier == None, css.to_owned());
+        assert!(q.media_type == MediaQueryType::Concrete(MediaType::print()), css.to_owned());
+        assert!(q.expressions.len() == 0, css.to_owned());
+    });
+
+    test_media_rule("@media only print { }", |list, css| {
+        assert!(list.media_queries.len() == 1, css.to_owned());
+        let q = &list.media_queries[0];
+        assert!(q.qualifier == Some(Qualifier::Only), css.to_owned());
+        assert!(q.media_type == MediaQueryType::Concrete(MediaType::print()), css.to_owned());
+        assert!(q.expressions.len() == 0, css.to_owned());
+    });
+
+    test_media_rule("@media not print { }", |list, css| {
+        assert!(list.media_queries.len() == 1, css.to_owned());
+        let q = &list.media_queries[0];
+        assert!(q.qualifier == Some(Qualifier::Not), css.to_owned());
+        assert!(q.media_type == MediaQueryType::Concrete(MediaType::print()), css.to_owned());
+        assert!(q.expressions.len() == 0, css.to_owned());
+    });
+}
+
+#[test]
+fn test_mq_unknown() {
+    test_media_rule("@media fridge { }", |list, css| {
+        assert!(list.media_queries.len() == 1, css.to_owned());
+        let q = &list.media_queries[0];
+        assert!(q.qualifier == None, css.to_owned());
+        assert!(q.media_type == MediaQueryType::Concrete(
+            MediaType(CustomIdent(Atom::from("fridge")))), css.to_owned());
+        assert!(q.expressions.len() == 0, css.to_owned());
+    });
+
+    test_media_rule("@media only glass { }", |list, css| {
+        assert!(list.media_queries.len() == 1, css.to_owned());
+        let q = &list.media_queries[0];
+        assert!(q.qualifier == Some(Qualifier::Only), css.to_owned());
+        assert!(q.media_type == MediaQueryType::Concrete(
+            MediaType(CustomIdent(Atom::from("glass")))), css.to_owned());
+        assert!(q.expressions.len() == 0, css.to_owned());
+    });
+
+    test_media_rule("@media not wood { }", |list, css| {
+        assert!(list.media_queries.len() == 1, css.to_owned());
+        let q = &list.media_queries[0];
+        assert!(q.qualifier == Some(Qualifier::Not), css.to_owned());
+        assert!(q.media_type == MediaQueryType::Concrete(
+            MediaType(CustomIdent(Atom::from("wood")))), css.to_owned());
+        assert!(q.expressions.len() == 0, css.to_owned());
+    });
+}
+
+#[test]
+fn test_mq_all() {
+    test_media_rule("@media all { }", |list, css| {
+        assert!(list.media_queries.len() == 1, css.to_owned());
+        let q = &list.media_queries[0];
+        assert!(q.qualifier == None, css.to_owned());
+        assert!(q.media_type == MediaQueryType::All, css.to_owned());
+        assert!(q.expressions.len() == 0, css.to_owned());
+    });
+
+    test_media_rule("@media only all { }", |list, css| {
+        assert!(list.media_queries.len() == 1, css.to_owned());
+        let q = &list.media_queries[0];
+        assert!(q.qualifier == Some(Qualifier::Only), css.to_owned());
+        assert!(q.media_type == MediaQueryType::All, css.to_owned());
+        assert!(q.expressions.len() == 0, css.to_owned());
+    });
+
+    test_media_rule("@media not all { }", |list, css| {
+        assert!(list.media_queries.len() == 1, css.to_owned());
+        let q = &list.media_queries[0];
+        assert!(q.qualifier == Some(Qualifier::Not), css.to_owned());
+        assert!(q.media_type == MediaQueryType::All, css.to_owned());
+        assert!(q.expressions.len() == 0, css.to_owned());
+    });
+}
+
+#[test]
+fn test_mq_or() {
+    test_media_rule("@media screen, print { }", |list, css| {
+        assert!(list.media_queries.len() == 2, css.to_owned());
+        let q0 = &list.media_queries[0];
+        assert!(q0.qualifier == None, css.to_owned());
+        assert!(q0.media_type == MediaQueryType::Concrete(MediaType::screen()), css.to_owned());
+        assert!(q0.expressions.len() == 0, css.to_owned());
+
+        let q1 = &list.media_queries[1];
+        assert!(q1.qualifier == None, css.to_owned());
+        assert!(q1.media_type == MediaQueryType::Concrete(MediaType::print()), css.to_owned());
+        assert!(q1.expressions.len() == 0, css.to_owned());
+    });
+}
+
+#[test]
+fn test_mq_default_expressions() {
+    test_media_rule("@media (min-width: 100px) { }", |list, css| {
+        assert!(list.media_queries.len() == 1, css.to_owned());
+        let q = &list.media_queries[0];
+        assert!(q.qualifier == None, css.to_owned());
+        assert!(q.media_type == MediaQueryType::All, css.to_owned());
+        assert!(q.expressions.len() == 1, css.to_owned());
+        match *q.expressions[0].kind_for_testing() {
+            ExpressionKind::Width(Range::Min(ref w)) => assert!(*w == specified::Length::from_px(100.)),
+            _ => panic!("wrong expression type"),
+        }
+    });
+
+    test_media_rule("@media (max-width: 43px) { }", |list, css| {
+        assert!(list.media_queries.len() == 1, css.to_owned());
+        let q = &list.media_queries[0];
+        assert!(q.qualifier == None, css.to_owned());
+        assert!(q.media_type == MediaQueryType::All, css.to_owned());
+        assert!(q.expressions.len() == 1, css.to_owned());
+        match *q.expressions[0].kind_for_testing() {
+            ExpressionKind::Width(Range::Max(ref w)) => assert!(*w == specified::Length::from_px(43.)),
+            _ => panic!("wrong expression type"),
+        }
+    });
+}
+
+#[test]
+fn test_mq_expressions() {
+    test_media_rule("@media screen and (min-width: 100px) { }", |list, css| {
+        assert!(list.media_queries.len() == 1, css.to_owned());
+        let q = &list.media_queries[0];
+        assert!(q.qualifier == None, css.to_owned());
+        assert!(q.media_type == MediaQueryType::Concrete(MediaType::screen()), css.to_owned());
+        assert!(q.expressions.len() == 1, css.to_owned());
+        match *q.expressions[0].kind_for_testing() {
+            ExpressionKind::Width(Range::Min(ref w)) => assert!(*w == specified::Length::from_px(100.)),
+            _ => panic!("wrong expression type"),
+        }
+    });
+
+    test_media_rule("@media print and (max-width: 43px) { }", |list, css| {
+        assert!(list.media_queries.len() == 1, css.to_owned());
+        let q = &list.media_queries[0];
+        assert!(q.qualifier == None, css.to_owned());
+        assert!(q.media_type == MediaQueryType::Concrete(MediaType::print()), css.to_owned());
+        assert!(q.expressions.len() == 1, css.to_owned());
+        match *q.expressions[0].kind_for_testing() {
+            ExpressionKind::Width(Range::Max(ref w)) => assert!(*w == specified::Length::from_px(43.)),
+            _ => panic!("wrong expression type"),
+        }
+    });
+
+    test_media_rule("@media print and (width: 43px) { }", |list, css| {
+        assert!(list.media_queries.len() == 1, css.to_owned());
+        let q = &list.media_queries[0];
+        assert!(q.qualifier == None, css.to_owned());
+        assert!(q.media_type == MediaQueryType::Concrete(MediaType::print()), css.to_owned());
+        assert!(q.expressions.len() == 1, css.to_owned());
+        match *q.expressions[0].kind_for_testing() {
+            ExpressionKind::Width(Range::Eq(ref w)) => assert!(*w == specified::Length::from_px(43.)),
+            _ => panic!("wrong expression type"),
+        }
+    });
+
+    test_media_rule("@media fridge and (max-width: 52px) { }", |list, css| {
+        assert!(list.media_queries.len() == 1, css.to_owned());
+        let q = &list.media_queries[0];
+        assert!(q.qualifier == None, css.to_owned());
+        assert!(q.media_type == MediaQueryType::Concrete(
+            MediaType(CustomIdent(Atom::from("fridge")))), css.to_owned());
+        assert!(q.expressions.len() == 1, css.to_owned());
+        match *q.expressions[0].kind_for_testing() {
+            ExpressionKind::Width(Range::Max(ref w)) => assert!(*w == specified::Length::from_px(52.)),
+            _ => panic!("wrong expression type"),
+        }
+    });
+}
+
+#[test]
+fn test_to_css() {
+    test_media_rule("@media print and (width: 43px) { }", |list, _| {
+        let q = &list.media_queries[0];
+        let dest = q.to_css_string();
+        assert_eq!(dest, "print and (width: 43px)");
+    });
+}
+
+#[test]
+fn test_mq_multiple_expressions() {
+    test_media_rule("@media (min-width: 100px) and (max-width: 200px) { }", |list, css| {
+        assert!(list.media_queries.len() == 1, css.to_owned());
+        let q = &list.media_queries[0];
+        assert!(q.qualifier == None, css.to_owned());
+        assert!(q.media_type == MediaQueryType::All, css.to_owned());
+        assert!(q.expressions.len() == 2, css.to_owned());
+        match *q.expressions[0].kind_for_testing() {
+            ExpressionKind::Width(Range::Min(ref w)) => assert!(*w == specified::Length::from_px(100.)),
+            _ => panic!("wrong expression type"),
+        }
+        match *q.expressions[1].kind_for_testing() {
+            ExpressionKind::Width(Range::Max(ref w)) => assert!(*w == specified::Length::from_px(200.)),
+            _ => panic!("wrong expression type"),
+        }
+    });
+
+    test_media_rule("@media not screen and (min-width: 100px) and (max-width: 200px) { }", |list, css| {
+        assert!(list.media_queries.len() == 1, css.to_owned());
+        let q = &list.media_queries[0];
+        assert!(q.qualifier == Some(Qualifier::Not), css.to_owned());
+        assert!(q.media_type == MediaQueryType::Concrete(MediaType::screen()), css.to_owned());
+        assert!(q.expressions.len() == 2, css.to_owned());
+        match *q.expressions[0].kind_for_testing() {
+            ExpressionKind::Width(Range::Min(ref w)) => assert!(*w == specified::Length::from_px(100.)),
+            _ => panic!("wrong expression type"),
+        }
+        match *q.expressions[1].kind_for_testing() {
+            ExpressionKind::Width(Range::Max(ref w)) => assert!(*w == specified::Length::from_px(200.)),
+            _ => panic!("wrong expression type"),
+        }
+    });
+}
+
+#[test]
+fn test_mq_malformed_expressions() {
+    fn check_malformed_expr(list: &MediaList, css: &str) {
+        assert!(!list.media_queries.is_empty(), css.to_owned());
+        for mq in &list.media_queries {
+            assert!(mq.qualifier == Some(Qualifier::Not), css.to_owned());
+            assert!(mq.media_type == MediaQueryType::All, css.to_owned());
+            assert!(mq.expressions.is_empty(), css.to_owned());
+        }
+    }
+
+    for rule in &[
+        "@media (min-width: 100blah) and (max-width: 200px) { }",
+        "@media screen and (height: 200px) { }",
+        "@media (min-width: 30em foo bar) {}",
+        "@media not {}",
+        "@media not (min-width: 300px) {}",
+        "@media , {}",
+    ] {
+        test_media_rule(rule, check_malformed_expr);
+    }
+}
+
+#[test]
+fn test_matching_simple() {
+    let device = Device::new(MediaType::screen(), Size2D::new(200.0, 100.0), Scale::new(1.0));
+
+    media_query_test(&device, "@media not all { a { color: red; } }", 0);
+    media_query_test(&device, "@media not screen { a { color: red; } }", 0);
+    media_query_test(&device, "@media not print { a { color: red; } }", 1);
+
+    media_query_test(&device, "@media unknown { a { color: red; } }", 0);
+    media_query_test(&device, "@media not unknown { a { color: red; } }", 1);
+
+    media_query_test(&device, "@media { a { color: red; } }", 1);
+    media_query_test(&device, "@media screen { a { color: red; } }", 1);
+    media_query_test(&device, "@media print { a { color: red; } }", 0);
+}
+
+#[test]
+fn test_matching_width() {
+    let device = Device::new(MediaType::screen(), Size2D::new(200.0, 100.0), Scale::new(1.0));
+
+    media_query_test(&device, "@media { a { color: red; } }", 1);
+
+    media_query_test(&device, "@media (min-width: 50px) { a { color: red; } }", 1);
+    media_query_test(&device, "@media (min-width: 150px) { a { color: red; } }", 1);
+    media_query_test(&device, "@media (min-width: 300px) { a { color: red; } }", 0);
+
+    media_query_test(&device, "@media screen and (min-width: 50px) { a { color: red; } }", 1);
+    media_query_test(&device, "@media screen and (min-width: 150px) { a { color: red; } }", 1);
+    media_query_test(&device, "@media screen and (min-width: 300px) { a { color: red; } }", 0);
+
+    media_query_test(&device, "@media not screen and (min-width: 50px) { a { color: red; } }", 0);
+    media_query_test(&device, "@media not screen and (min-width: 150px) { a { color: red; } }", 0);
+    media_query_test(&device, "@media not screen and (min-width: 300px) { a { color: red; } }", 1);
+
+    media_query_test(&device, "@media (max-width: 50px) { a { color: red; } }", 0);
+    media_query_test(&device, "@media (max-width: 150px) { a { color: red; } }", 0);
+    media_query_test(&device, "@media (max-width: 300px) { a { color: red; } }", 1);
+
+    media_query_test(&device, "@media screen and (min-width: 50px) and (max-width: 100px) { a { color: red; } }", 0);
+    media_query_test(&device, "@media screen and (min-width: 250px) and (max-width: 300px) { a { color: red; } }", 0);
+    media_query_test(&device, "@media screen and (min-width: 50px) and (max-width: 250px) { a { color: red; } }", 1);
+
+    media_query_test(
+        &device, "@media not screen and (min-width: 50px) and (max-width: 100px) { a { color: red; } }", 1);
+    media_query_test(
+        &device, "@media not screen and (min-width: 250px) and (max-width: 300px) { a { color: red; } }", 1);
+    media_query_test(
+        &device, "@media not screen and (min-width: 50px) and (max-width: 250px) { a { color: red; } }", 0);
+
+    media_query_test(
+        &device, "@media not screen and (min-width: 3.1em) and (max-width: 6em) { a { color: red; } }", 1);
+    media_query_test(
+        &device, "@media not screen and (min-width: 16em) and (max-width: 19.75em) { a { color: red; } }", 1);
+    media_query_test(
+        &device, "@media not screen and (min-width: 3em) and (max-width: 250px) { a { color: red; } }", 0);
+}
+
+#[test]
+fn test_matching_invalid() {
+    let device = Device::new(MediaType::screen(), Size2D::new(200.0, 100.0), Scale::new(1.0));
+
+    media_query_test(&device, "@media fridge { a { color: red; } }", 0);
+    media_query_test(&device, "@media screen and (height: 100px) { a { color: red; } }", 0);
+    media_query_test(&device, "@media not print and (width: 100) { a { color: red; } }", 0);
+}
diff --git a/servo/tests/unit/style/parsing/animation.rs b/servo/tests/unit/style/parsing/animation.rs
new file mode 100644
index 0000000000..a4b2d78597
--- /dev/null
+++ b/servo/tests/unit/style/parsing/animation.rs
@@ -0,0 +1,21 @@
+/* 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/. */
+
+use parsing::parse;
+use servo_atoms::Atom;
+use style::parser::Parse;
+use style::properties::longhands::animation_name;
+use style::values::{KeyframesName, CustomIdent};
+use style::values::specified::AnimationIterationCount;
+use style_traits::ToCss;
+
+#[test]
+fn test_animation_iteration() {
+    assert_roundtrip_with_context!(AnimationIterationCount::parse, "0", "0");
+    assert_roundtrip_with_context!(AnimationIterationCount::parse, "0.1", "0.1");
+    assert_roundtrip_with_context!(AnimationIterationCount::parse, "infinite", "infinite");
+
+    // Negative numbers are invalid
+    assert!(parse(AnimationIterationCount::parse, "-1").is_err());
+}
diff --git a/servo/tests/unit/style/parsing/background.rs b/servo/tests/unit/style/parsing/background.rs
new file mode 100644
index 0000000000..7f091a5b05
--- /dev/null
+++ b/servo/tests/unit/style/parsing/background.rs
@@ -0,0 +1,104 @@
+/* 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/. */
+
+use parsing::parse;
+use style::properties::longhands::{background_attachment, background_clip, background_color, background_image};
+use style::properties::longhands::{background_origin, background_position_x, background_position_y, background_repeat};
+use style::properties::longhands::background_size;
+use style::properties::shorthands::background;
+
+#[test]
+fn background_shorthand_should_parse_all_available_properties_when_specified() {
+    let input = "url(\"http://servo/test.png\") top center / 200px 200px repeat-x fixed padding-box content-box red";
+    let result = parse(background::parse_value, input).unwrap();
+
+    assert_eq!(result.background_image, parse_longhand!(background_image, "url(\"http://servo/test.png\")"));
+    assert_eq!(result.background_position_x, parse_longhand!(background_position_x, "center"));
+    assert_eq!(result.background_position_y, parse_longhand!(background_position_y, "top"));
+    assert_eq!(result.background_size, parse_longhand!(background_size, "200px 200px"));
+    assert_eq!(result.background_repeat, parse_longhand!(background_repeat, "repeat-x"));
+    assert_eq!(result.background_attachment, parse_longhand!(background_attachment, "fixed"));
+    assert_eq!(result.background_origin, parse_longhand!(background_origin, "padding-box"));
+    assert_eq!(result.background_clip, parse_longhand!(background_clip, "content-box"));
+    assert_eq!(result.background_color, parse_longhand!(background_color, "red"));
+}
+
+#[test]
+fn background_shorthand_should_parse_when_some_fields_set() {
+    let result = parse(background::parse_value, "14px 40px repeat-y").unwrap();
+
+    assert_eq!(result.background_position_x, parse_longhand!(background_position_x, "14px"));
+    assert_eq!(result.background_position_y, parse_longhand!(background_position_y, "40px"));
+    assert_eq!(result.background_repeat, parse_longhand!(background_repeat, "repeat-y"));
+
+    let result = parse(background::parse_value, "url(\"http://servo/test.png\") repeat blue").unwrap();
+
+    assert_eq!(result.background_image, parse_longhand!(background_image, "url(\"http://servo/test.png\")"));
+    assert_eq!(result.background_repeat, parse_longhand!(background_repeat, "repeat"));
+    assert_eq!(result.background_color, parse_longhand!(background_color, "blue"));
+
+    let result = parse(background::parse_value, "padding-box").unwrap();
+
+    assert_eq!(result.background_origin, parse_longhand!(background_origin, "padding-box"));
+    assert_eq!(result.background_clip, parse_longhand!(background_clip, "padding-box"));
+
+    let result = parse(background::parse_value, "url(\"http://servo/test.png\")").unwrap();
+
+    assert_eq!(result.background_image, parse_longhand!(background_image, "url(\"http://servo/test.png\")"));
+}
+
+#[test]
+fn background_shorthand_should_parse_comma_separated_declarations() {
+    let input = "url(\"http://servo/test.png\") top left no-repeat, url(\"http://servo/test.png\") \
+        center / 100% 100% no-repeat, white";
+    let result = parse(background::parse_value, input).unwrap();
+
+    assert_eq!(result.background_image, parse_longhand!(background_image, "url(\"http://servo/test.png\"), \
+        url(\"http://servo/test.png\"), none"));
+    assert_eq!(result.background_position_x, parse_longhand!(background_position_x, "left, center, 0%"));
+    assert_eq!(result.background_position_y, parse_longhand!(background_position_y, "top, center, 0%"));
+    assert_eq!(result.background_repeat, parse_longhand!(background_repeat, "no-repeat, no-repeat, repeat"));
+    assert_eq!(result.background_clip, parse_longhand!(background_clip, "border-box, border-box, border-box"));
+    assert_eq!(result.background_origin, parse_longhand!(background_origin, "padding-box, padding-box, \
+        padding-box"));
+    assert_eq!(result.background_size, parse_longhand!(background_size, "auto auto, 100% 100%, auto auto"));
+    assert_eq!(result.background_attachment, parse_longhand!(background_attachment, "scroll, scroll, scroll"));
+    assert_eq!(result.background_color, parse_longhand!(background_color, "white"));
+}
+
+#[test]
+fn background_shorthand_should_parse_position_and_size_correctly() {
+    let result = parse(background::parse_value, "7px 4px").unwrap();
+
+    assert_eq!(result.background_position_x, parse_longhand!(background_position_x, "7px"));
+    assert_eq!(result.background_position_y, parse_longhand!(background_position_y, "4px"));
+
+    let result = parse(background::parse_value, "7px 4px / 30px 20px").unwrap();
+
+    assert_eq!(result.background_position_x, parse_longhand!(background_position_x, "7px"));
+    assert_eq!(result.background_position_y, parse_longhand!(background_position_y, "4px"));
+    assert_eq!(result.background_size, parse_longhand!(background_size, "30px 20px"));
+
+    assert!(parse(background::parse_value, "/ 30px 20px").is_err());
+
+    assert!(parse(background::parse_value, "repeat-x / 30px 20px").is_err());
+}
+
+#[test]
+fn background_shorthand_should_parse_origin_and_clip_correctly() {
+    let result = parse(background::parse_value, "padding-box content-box").unwrap();
+
+    assert_eq!(result.background_origin, parse_longhand!(background_origin, "padding-box"));
+    assert_eq!(result.background_clip, parse_longhand!(background_clip, "content-box"));
+
+    let result = parse(background::parse_value, "padding-box padding-box").unwrap();
+
+    assert_eq!(result.background_origin, parse_longhand!(background_origin, "padding-box"));
+    assert_eq!(result.background_clip, parse_longhand!(background_clip, "padding-box"));
+
+    let result = parse(background::parse_value, "padding-box").unwrap();
+
+    assert_eq!(result.background_origin, parse_longhand!(background_origin, "padding-box"));
+    assert_eq!(result.background_clip, parse_longhand!(background_clip, "padding-box"));
+}
diff --git a/servo/tests/unit/style/parsing/border.rs b/servo/tests/unit/style/parsing/border.rs
new file mode 100644
index 0000000000..3565d6ad53
--- /dev/null
+++ b/servo/tests/unit/style/parsing/border.rs
@@ -0,0 +1,190 @@
+/* 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/. */
+
+use parsing::parse;
+use style::parser::Parse;
+use style::properties::MaybeBoxed;
+use style::properties::longhands::{border_image_outset, border_image_repeat, border_image_slice};
+use style::properties::longhands::{border_image_source, border_image_width};
+use style::properties::shorthands::border_image;
+use style::values::specified::BorderRadius;
+use style_traits::ToCss;
+
+macro_rules! assert_longhand {
+    ($parsed_shorthand: expr, $prop: ident, $value_string: expr) => {
+        assert_eq!($parsed_shorthand.$prop, parse_longhand!($prop, $value_string).maybe_boxed())
+    }
+}
+
+macro_rules! assert_initial {
+    ($parsed_shorthand: expr, $prop: ident) => {
+        assert_eq!($parsed_shorthand.$prop, $prop::get_initial_specified_value().maybe_boxed())
+    }
+}
+
+macro_rules! assert_border_radius_values {
+    ($input:expr; $tlw:expr, $trw:expr, $brw:expr, $blw:expr ;
+                  $tlh:expr, $trh:expr, $brh:expr, $blh:expr) => {
+        let input = parse(BorderRadius::parse, $input)
+                          .expect(&format!("Failed parsing {} as border radius",
+                                  $input));
+        assert_eq!(::style_traits::ToCss::to_css_string(&input.top_left.0.width()), $tlw);
+        assert_eq!(::style_traits::ToCss::to_css_string(&input.top_right.0.width()), $trw);
+        assert_eq!(::style_traits::ToCss::to_css_string(&input.bottom_right.0.width()), $brw);
+        assert_eq!(::style_traits::ToCss::to_css_string(&input.bottom_left.0.width()), $blw);
+        assert_eq!(::style_traits::ToCss::to_css_string(&input.top_left.0.height()), $tlh);
+        assert_eq!(::style_traits::ToCss::to_css_string(&input.top_right.0.height()), $trh);
+        assert_eq!(::style_traits::ToCss::to_css_string(&input.bottom_right.0.height()), $brh);
+        assert_eq!(::style_traits::ToCss::to_css_string(&input.bottom_left.0.height()), $blh);
+    }
+}
+
+#[test]
+fn test_border_radius() {
+    assert_border_radius_values!("10px";
+                                 "10px", "10px", "10px", "10px" ;
+                                 "10px", "10px", "10px", "10px");
+    assert_border_radius_values!("10px 20px";
+                                 "10px", "20px", "10px", "20px" ;
+                                 "10px", "20px", "10px", "20px");
+    assert_border_radius_values!("10px 20px 30px";
+                                 "10px", "20px", "30px", "20px" ;
+                                 "10px", "20px", "30px", "20px");
+    assert_border_radius_values!("10px 20px 30px 40px";
+                                 "10px", "20px", "30px", "40px" ;
+                                 "10px", "20px", "30px", "40px");
+    assert_border_radius_values!("10% / 20px";
+                                 "10%", "10%", "10%", "10%" ;
+                                 "20px", "20px", "20px", "20px");
+    assert_border_radius_values!("10px / 20px 30px";
+                                 "10px", "10px", "10px", "10px" ;
+                                 "20px", "30px", "20px", "30px");
+    assert_border_radius_values!("10px 20px 30px 40px / 1px 2px 3px 4px";
+                                 "10px", "20px", "30px", "40px" ;
+                                 "1px", "2px", "3px", "4px");
+    assert_border_radius_values!("10px 20px 30px 40px / 1px 2px 3px 4px";
+                                 "10px", "20px", "30px", "40px" ;
+                                 "1px", "2px", "3px", "4px");
+    assert_border_radius_values!("10px 20px 30px 40px / 1px 2px 3px 4px";
+                                 "10px", "20px", "30px", "40px" ;
+                                 "1px", "2px", "3px", "4px");
+    assert_border_radius_values!("10px -20px 30px 40px";
+                                 "10px", "10px", "10px", "10px";
+                                 "10px", "10px", "10px", "10px");
+    assert_border_radius_values!("10px 20px -30px 40px";
+                                 "10px", "20px", "10px", "20px";
+                                 "10px", "20px", "10px", "20px");
+    assert_border_radius_values!("10px 20px 30px -40px";
+                                 "10px", "20px", "30px", "20px";
+                                 "10px", "20px", "30px", "20px");
+    assert!(parse(BorderRadius::parse, "-10px 20px 30px 40px").is_err());
+}
+
+#[test]
+fn border_image_shorthand_should_parse_when_all_properties_specified() {
+    let input = "linear-gradient(red, blue) 30 30% 45 fill / 20px 40px / 10px round stretch";
+    let result = parse(border_image::parse_value, input).unwrap();
+
+    assert_longhand!(result, border_image_source, "linear-gradient(red, blue)");
+    assert_longhand!(result, border_image_slice, "30 30% 45 fill");
+    assert_longhand!(result, border_image_width, "20px 40px");
+    assert_longhand!(result, border_image_outset, "10px");
+    assert_longhand!(result, border_image_repeat, "round stretch");
+}
+
+#[test]
+fn border_image_shorthand_should_parse_without_width() {
+    let input = "linear-gradient(red, blue) 30 30% 45 fill / / 10px round stretch";
+    let result = parse(border_image::parse_value, input).unwrap();
+
+    assert_longhand!(result, border_image_source, "linear-gradient(red, blue)");
+    assert_longhand!(result, border_image_slice, "30 30% 45 fill");
+    assert_longhand!(result, border_image_outset, "10px");
+    assert_longhand!(result, border_image_repeat, "round stretch");
+    assert_initial!(result, border_image_width);
+}
+
+#[test]
+fn border_image_shorthand_should_parse_without_outset() {
+    let input = "linear-gradient(red, blue) 30 30% 45 fill / 20px 40px round";
+    let result = parse(border_image::parse_value, input).unwrap();
+
+    assert_longhand!(result, border_image_source, "linear-gradient(red, blue)");
+    assert_longhand!(result, border_image_slice, "30 30% 45 fill");
+    assert_longhand!(result, border_image_width, "20px 40px");
+    assert_longhand!(result, border_image_repeat, "round");
+    assert_initial!(result, border_image_outset);
+}
+
+#[test]
+fn border_image_shorthand_should_parse_without_width_or_outset() {
+    let input = "linear-gradient(red, blue) 30 30% 45 fill round";
+    let result = parse(border_image::parse_value, input).unwrap();
+
+    assert_longhand!(result, border_image_source, "linear-gradient(red, blue)");
+    assert_longhand!(result, border_image_slice, "30 30% 45 fill");
+    assert_longhand!(result, border_image_repeat, "round");
+    assert_initial!(result, border_image_width);
+    assert_initial!(result, border_image_outset);
+}
+
+#[test]
+fn border_image_shorthand_should_parse_with_just_source() {
+    let result = parse(border_image::parse_value, "linear-gradient(red, blue)").unwrap();
+
+    assert_longhand!(result, border_image_source, "linear-gradient(red, blue)");
+    assert_initial!(result, border_image_slice);
+    assert_initial!(result, border_image_width);
+    assert_initial!(result, border_image_outset);
+    assert_initial!(result, border_image_repeat);
+}
+
+#[test]
+fn border_image_outset_should_error_on_negative_length() {
+    let result = parse(border_image_outset::parse, "-1em");
+    assert!(result.is_err());
+}
+
+#[test]
+fn border_image_outset_should_error_on_negative_number() {
+    let result = parse(border_image_outset::parse, "-15");
+    assert!(result.is_err());
+}
+
+#[test]
+fn border_image_outset_should_return_number_on_plain_zero() {
+    let result = parse(border_image_outset::parse, "0");
+    assert_eq!(result.unwrap(), parse_longhand!(border_image_outset, "0"));
+}
+
+#[test]
+fn border_image_outset_should_return_length_on_length_zero() {
+    let result = parse(border_image_outset::parse, "0em");
+    assert_eq!(result.unwrap(), parse_longhand!(border_image_outset, "0em"));
+}
+
+#[test]
+fn test_border_style() {
+    use style::values::specified::BorderStyle;
+
+    assert_roundtrip_with_context!(<BorderStyle as Parse>::parse, r#"none"#);
+    assert_roundtrip_with_context!(<BorderStyle as Parse>::parse, r#"hidden"#);
+    assert_roundtrip_with_context!(<BorderStyle as Parse>::parse, r#"solid"#);
+    assert_roundtrip_with_context!(<BorderStyle as Parse>::parse, r#"double"#);
+    assert_roundtrip_with_context!(<BorderStyle as Parse>::parse, r#"dotted"#);
+    assert_roundtrip_with_context!(<BorderStyle as Parse>::parse, r#"dashed"#);
+    assert_roundtrip_with_context!(<BorderStyle as Parse>::parse, r#"groove"#);
+    assert_roundtrip_with_context!(<BorderStyle as Parse>::parse, r#"ridge"#);
+    assert_roundtrip_with_context!(<BorderStyle as Parse>::parse, r#"inset"#);
+    assert_roundtrip_with_context!(<BorderStyle as Parse>::parse, r#"outset"#);
+}
+
+#[test]
+fn test_border_spacing() {
+    use style::properties::longhands::border_spacing;
+
+    assert_parser_exhausted!(border_spacing::parse, "1px rubbish", false);
+    assert_parser_exhausted!(border_spacing::parse, "1px", true);
+    assert_parser_exhausted!(border_spacing::parse, "1px 2px", true);
+}
diff --git a/servo/tests/unit/style/parsing/box_.rs b/servo/tests/unit/style/parsing/box_.rs
new file mode 100644
index 0000000000..cec950c3cd
--- /dev/null
+++ b/servo/tests/unit/style/parsing/box_.rs
@@ -0,0 +1,22 @@
+/* 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/. */
+
+use parsing::parse;
+use style_traits::ToCss;
+
+#[test]
+fn test_transform_translate() {
+    use style::properties::longhands::transform;
+    assert_roundtrip_with_context!(transform::parse, "translate(2px)");
+    assert_roundtrip_with_context!(transform::parse, "translate(2px, 5px)");
+    assert!(parse(transform::parse, "translate(2px foo)").is_err());
+    assert!(parse(transform::parse, "perspective(-10px)").is_err());
+}
+
+#[test]
+fn test_unexhausted_transform() {
+    use style::properties::longhands::transform;
+    assert_parser_exhausted!(transform::parse, "rotate(70deg)foo", false);
+    assert_parser_exhausted!(transform::parse, "rotate(70deg) foo", false);
+}
diff --git a/servo/tests/unit/style/parsing/column.rs b/servo/tests/unit/style/parsing/column.rs
new file mode 100644
index 0000000000..6e0e86182a
--- /dev/null
+++ b/servo/tests/unit/style/parsing/column.rs
@@ -0,0 +1,30 @@
+/* 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/. */
+
+use parsing::parse;
+use style_traits::ToCss;
+
+#[test]
+fn test_column_width() {
+    use style::properties::longhands::column_width;
+
+    assert_roundtrip_with_context!(column_width::parse, "auto");
+    assert_roundtrip_with_context!(column_width::parse, "6px");
+    assert_roundtrip_with_context!(column_width::parse, "2.5em");
+    assert_roundtrip_with_context!(column_width::parse, "0.3vw");
+
+    assert!(parse(column_width::parse, "-6px").is_err());
+}
+
+#[test]
+fn test_column_gap() {
+    use style::properties::longhands::column_gap;
+
+    assert_roundtrip_with_context!(column_gap::parse, "normal");
+    assert_roundtrip_with_context!(column_gap::parse, "6px");
+    assert_roundtrip_with_context!(column_gap::parse, "2.5em");
+    assert_roundtrip_with_context!(column_gap::parse, "0.3vw");
+
+    assert!(parse(column_gap::parse, "-6px").is_err());
+}
diff --git a/servo/tests/unit/style/parsing/effects.rs b/servo/tests/unit/style/parsing/effects.rs
new file mode 100644
index 0000000000..faf1126efa
--- /dev/null
+++ b/servo/tests/unit/style/parsing/effects.rs
@@ -0,0 +1,91 @@
+/* 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/. */
+
+use parsing::parse;
+use style::properties::longhands::{perspective_origin, transform_origin};
+use style_traits::ToCss;
+
+#[test]
+fn test_clip() {
+    use style::properties::longhands::clip;
+
+    assert_roundtrip_with_context!(clip::parse, "auto");
+    assert_roundtrip_with_context!(clip::parse, "rect(1px, 2px, 3px, 4px)");
+    assert_roundtrip_with_context!(clip::parse, "rect(1px, auto, auto, 4px)");
+    assert_roundtrip_with_context!(clip::parse, "rect(auto, auto, auto, auto)");
+
+    // Non-standard syntax
+    assert_roundtrip_with_context!(clip::parse,
+                                   "rect(1px 2px 3px 4px)",
+                                   "rect(1px, 2px, 3px, 4px)");
+    assert_roundtrip_with_context!(clip::parse,
+                                   "rect(auto 2px 3px auto)",
+                                   "rect(auto, 2px, 3px, auto)");
+    assert_roundtrip_with_context!(clip::parse,
+                                   "rect(1px auto auto 4px)",
+                                   "rect(1px, auto, auto, 4px)");
+    assert_roundtrip_with_context!(clip::parse,
+                                   "rect(auto auto auto auto)",
+                                   "rect(auto, auto, auto, auto)");
+}
+
+#[test]
+fn test_effects_parser_exhaustion() {
+    assert_parser_exhausted!(perspective_origin::parse, "1px 1px", true);
+    assert_parser_exhausted!(transform_origin::parse, "1px 1px", true);
+
+    assert_parser_exhausted!(perspective_origin::parse, "1px some-rubbish", false);
+    assert_parser_exhausted!(transform_origin::parse, "1px some-rubbish", false);
+}
+
+#[test]
+fn test_parse_factor() {
+    use parsing::parse;
+    use style::properties::longhands::filter;
+
+    assert!(parse(filter::parse, "brightness(0)").is_ok());
+    assert!(parse(filter::parse, "brightness(55)").is_ok());
+    assert!(parse(filter::parse, "brightness(100)").is_ok());
+
+    assert!(parse(filter::parse, "contrast(0)").is_ok());
+    assert!(parse(filter::parse, "contrast(55)").is_ok());
+    assert!(parse(filter::parse, "contrast(100)").is_ok());
+
+    assert!(parse(filter::parse, "grayscale(0)").is_ok());
+    assert!(parse(filter::parse, "grayscale(55)").is_ok());
+    assert!(parse(filter::parse, "grayscale(100)").is_ok());
+
+    assert!(parse(filter::parse, "invert(0)").is_ok());
+    assert!(parse(filter::parse, "invert(55)").is_ok());
+    assert!(parse(filter::parse, "invert(100)").is_ok());
+
+    assert!(parse(filter::parse, "opacity(0)").is_ok());
+    assert!(parse(filter::parse, "opacity(55)").is_ok());
+    assert!(parse(filter::parse, "opacity(100)").is_ok());
+
+    assert!(parse(filter::parse, "sepia(0)").is_ok());
+    assert!(parse(filter::parse, "sepia(55)").is_ok());
+    assert!(parse(filter::parse, "sepia(100)").is_ok());
+
+    assert!(parse(filter::parse, "saturate(0)").is_ok());
+    assert!(parse(filter::parse, "saturate(55)").is_ok());
+    assert!(parse(filter::parse, "saturate(100)").is_ok());
+
+    // Negative numbers are invalid for certain filters
+    assert!(parse(filter::parse, "brightness(-1)").is_err());
+    assert!(parse(filter::parse, "contrast(-1)").is_err());
+    assert!(parse(filter::parse, "grayscale(-1)").is_err());
+    assert!(parse(filter::parse, "invert(-1)").is_err());
+    assert!(parse(filter::parse, "opacity(-1)").is_err());
+    assert!(parse(filter::parse, "sepia(-1)").is_err());
+    assert!(parse(filter::parse, "saturate(-1)").is_err());
+}
+
+#[test]
+fn blur_radius_should_not_accept_negavite_values() {
+    use style::properties::longhands::box_shadow;
+    assert!(parse(box_shadow::parse, "1px 1px -1px").is_err());// for -ve values
+    assert!(parse(box_shadow::parse, "1px 1px 0").is_ok());// for zero
+    assert!(parse(box_shadow::parse, "1px 1px 1px").is_ok());// for +ve value
+}
diff --git a/servo/tests/unit/style/parsing/image.rs b/servo/tests/unit/style/parsing/image.rs
new file mode 100644
index 0000000000..8833eaf391
--- /dev/null
+++ b/servo/tests/unit/style/parsing/image.rs
@@ -0,0 +1,104 @@
+/* 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/. */
+
+use style::parser::Parse;
+use style::values::specified::image::*;
+use style_traits::ToCss;
+
+#[test]
+fn test_linear_gradient() {
+    // Parsing from the right
+    assert_roundtrip_with_context!(Image::parse, "linear-gradient(to left, red, green)");
+
+    // Parsing from the left
+    assert_roundtrip_with_context!(Image::parse, "linear-gradient(to right, red, green)");
+
+    // Parsing with two values for <side-or-corner>
+    assert_roundtrip_with_context!(Image::parse, "linear-gradient(to right top, red, green)");
+
+    // Parsing with <angle>
+    assert_roundtrip_with_context!(Image::parse, "linear-gradient(45deg, red, green)");
+
+    // Parsing with more than two entries in <color-stop-list>
+    assert_roundtrip_with_context!(Image::parse, "linear-gradient(red, yellow, green)");
+
+    // Parsing with percentage in the <color-stop-list>
+    assert_roundtrip_with_context!(Image::parse, "linear-gradient(red, green, yellow 50%)");
+
+    // Parsing without <angle> and <side-or-corner>
+    assert_roundtrip_with_context!(Image::parse, "linear-gradient(red, green)");
+}
+
+#[test]
+fn test_radial_gradient() {
+    // Parsing with all values
+    assert_roundtrip_with_context!(Image::parse, "radial-gradient(circle closest-side at 20px 30px, red, green)");
+    assert_roundtrip_with_context!(Image::parse, "radial-gradient(ellipse closest-side at 20px 30px, red, green)",
+                                                 "radial-gradient(closest-side at 20px 30px, red, green)");
+    assert_roundtrip_with_context!(Image::parse, "radial-gradient(closest-side circle at 20px 30px, red, green)",
+                                                 "radial-gradient(circle closest-side at 20px 30px, red, green)");
+    assert_roundtrip_with_context!(Image::parse, "radial-gradient(closest-side ellipse at 20px 30px, red, green)",
+                                                 "radial-gradient(closest-side at 20px 30px, red, green)");
+
+    // Parsing with <shape-keyword> and <size> reversed
+    assert_roundtrip_with_context!(Image::parse, "radial-gradient(closest-side circle at 20px 30px, red, green)",
+                                                 "radial-gradient(circle closest-side at 20px 30px, red, green)");
+    assert_roundtrip_with_context!(Image::parse, "radial-gradient(closest-corner ellipse at 20px 30px, red, green)",
+                                                 "radial-gradient(closest-corner at 20px 30px, red, green)");
+    assert_roundtrip_with_context!(Image::parse, "radial-gradient(30px circle, red, green)",
+                                                 "radial-gradient(30px at center center, red, green)");
+    assert_roundtrip_with_context!(Image::parse, "radial-gradient(30px 40px ellipse, red, green)",
+                                                 "radial-gradient(30px 40px at center center, red, green)");
+
+    // Parsing without <size>
+    assert_roundtrip_with_context!(Image::parse,
+                                   "radial-gradient(circle, red, green)",
+                                   "radial-gradient(circle at center center, red, green)");
+    assert_roundtrip_with_context!(Image::parse,
+                                   "radial-gradient(ellipse, red, green)",
+                                   "radial-gradient(at center center, red, green)");
+    assert_roundtrip_with_context!(Image::parse,
+                                   "radial-gradient(circle at 20px 30px, red, green)");
+    assert_roundtrip_with_context!(Image::parse,
+                                   "radial-gradient(ellipse at 20px 30px, red, green)",
+                                   "radial-gradient(at 20px 30px, red, green)");
+
+
+    // Parsing without <shape-keyword>
+    assert_roundtrip_with_context!(Image::parse,
+                                   "radial-gradient(20px at 20px 30px, red, green)");
+    assert_roundtrip_with_context!(Image::parse,
+                                   "radial-gradient(20px 30px at left center, red, green)");
+    assert_roundtrip_with_context!(Image::parse,
+                                   "radial-gradient(closest-side at center, red, green)",
+                                   "radial-gradient(closest-side at center center, red, green)");
+    assert_roundtrip_with_context!(Image::parse,
+                                   "radial-gradient(20px, red, green)",
+                                   "radial-gradient(20px at center center, red, green)");
+    assert_roundtrip_with_context!(Image::parse,
+                                   "radial-gradient(20px 30px, red, green)",
+                                   "radial-gradient(20px 30px at center center, red, green)");
+    assert_roundtrip_with_context!(Image::parse,
+                                   "radial-gradient(closest-side, red, green)",
+                                   "radial-gradient(closest-side at center center, red, green)");
+
+    // Parsing without <shape-keyword> and <size>
+    assert_roundtrip_with_context!(Image::parse,
+                                   "radial-gradient(at center, red, green)",
+                                   "radial-gradient(at center center, red, green)");
+    assert_roundtrip_with_context!(Image::parse,
+                                   "radial-gradient(at center bottom, red, green)");
+    assert_roundtrip_with_context!(Image::parse,
+                                   "radial-gradient(at 40px 50px, red, green)");
+
+    // Parsing with just color stops
+    assert_roundtrip_with_context!(Image::parse,
+                                   "radial-gradient(red, green)",
+                                   "radial-gradient(at center center, red, green)");
+
+    // Parsing repeating radial gradient
+    assert_roundtrip_with_context!(Image::parse,
+                                   "repeating-radial-gradient(red, green)",
+                                   "repeating-radial-gradient(at center center, red, green)");
+}
diff --git a/servo/tests/unit/style/parsing/inherited_text.rs b/servo/tests/unit/style/parsing/inherited_text.rs
new file mode 100644
index 0000000000..abcbe5d091
--- /dev/null
+++ b/servo/tests/unit/style/parsing/inherited_text.rs
@@ -0,0 +1,44 @@
+/* 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/. */
+
+use parsing::parse;
+use style::values::generics::text::Spacing;
+
+#[test]
+fn negative_letter_spacing_should_parse_properly() {
+    use style::properties::longhands::letter_spacing;
+    use style::values::specified::length::{Length, NoCalcLength, FontRelativeLength};
+
+    let negative_value = parse_longhand!(letter_spacing, "-0.5em");
+    let expected = Spacing::Value(Length::NoCalc(NoCalcLength::FontRelative(FontRelativeLength::Em(-0.5))));
+    assert_eq!(negative_value, expected);
+}
+
+#[test]
+fn negative_word_spacing_should_parse_properly() {
+    use style::properties::longhands::word_spacing;
+    use style::values::specified::length::{NoCalcLength, LengthPercentage, FontRelativeLength};
+
+    let negative_value = parse_longhand!(word_spacing, "-0.5em");
+    let expected = Spacing::Value(LengthPercentage::Length(
+        NoCalcLength::FontRelative(FontRelativeLength::Em(-0.5))
+    ));
+    assert_eq!(negative_value, expected);
+}
+
+#[test]
+fn line_height_should_return_number_on_plain_zero() {
+    use style::properties::longhands::line_height;
+
+    let result = parse(line_height::parse, "0").unwrap();
+    assert_eq!(result, parse_longhand!(line_height, "0"));
+}
+
+#[test]
+fn line_height_should_return_length_on_length_zero() {
+    use style::properties::longhands::line_height;
+
+    let result = parse(line_height::parse, "0px").unwrap();
+    assert_eq!(result, parse_longhand!(line_height, "0px"));
+}
diff --git a/servo/tests/unit/style/parsing/mod.rs b/servo/tests/unit/style/parsing/mod.rs
new file mode 100644
index 0000000000..dc931633e7
--- /dev/null
+++ b/servo/tests/unit/style/parsing/mod.rs
@@ -0,0 +1,126 @@
+/* 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/. */
+
+//! Tests for parsing and serialization of values/properties
+
+use cssparser::{Parser, ParserInput};
+use style::context::QuirksMode;
+use style::parser::ParserContext;
+use style::stylesheets::{CssRuleType, Origin};
+use style_traits::{ParsingMode, ParseError};
+
+fn parse<T, F>(f: F, s: &'static str) -> Result<T, ParseError<'static>>
+where F: for<'t> Fn(&ParserContext, &mut Parser<'static, 't>) -> Result<T, ParseError<'static>> {
+    let mut input = ParserInput::new(s);
+    parse_input(f, &mut input)
+}
+
+fn parse_input<'i: 't, 't, T, F>(f: F, input: &'t mut ParserInput<'i>) -> Result<T, ParseError<'i>>
+where F: Fn(&ParserContext, &mut Parser<'i, 't>) -> Result<T, ParseError<'i>> {
+    let url = ::servo_url::ServoUrl::parse("http://localhost").unwrap();
+    let context = ParserContext::new(
+        Origin::Author,
+        &url,
+        Some(CssRuleType::Style),
+        ParsingMode::DEFAULT,
+        QuirksMode::NoQuirks,
+        None,
+        None,
+    );
+    let mut parser = Parser::new(input);
+    f(&context, &mut parser)
+}
+
+fn parse_entirely<T, F>(f: F, s: &'static str) -> Result<T, ParseError<'static>>
+where F: for<'t> Fn(&ParserContext, &mut Parser<'static, 't>) -> Result<T, ParseError<'static>> {
+    let mut input = ParserInput::new(s);
+    parse_entirely_input(f, &mut input)
+}
+
+fn parse_entirely_input<'i: 't, 't, T, F>(f: F, input: &'t mut ParserInput<'i>) -> Result<T, ParseError<'i>>
+where F: Fn(&ParserContext, &mut Parser<'i, 't>) -> Result<T, ParseError<'i>> {
+    parse_input(|context, parser| parser.parse_entirely(|p| f(context, p)), input)
+}
+
+// This is a macro so that the file/line information
+// is preserved in the panic
+macro_rules! assert_roundtrip_with_context {
+    ($fun:expr, $string:expr) => {
+        assert_roundtrip_with_context!($fun, $string, $string);
+    };
+    ($fun:expr, $input:expr, $output:expr) => {{
+        let mut input = ::cssparser::ParserInput::new($input);
+        let serialized = super::parse_input(|context, i| {
+            let parsed = $fun(context, i)
+                         .expect(&format!("Failed to parse {}", $input));
+            let serialized = ToCss::to_css_string(&parsed);
+            assert_eq!(serialized, $output);
+            Ok(serialized)
+        }, &mut input).unwrap();
+
+        let mut input = ::cssparser::ParserInput::new(&serialized);
+        let unwrapped = super::parse_input(|context, i| {
+            let re_parsed = $fun(context, i)
+                            .expect(&format!("Failed to parse serialization {}", $input));
+            let re_serialized = ToCss::to_css_string(&re_parsed);
+            assert_eq!(serialized, re_serialized);
+            Ok(())
+        }, &mut input).unwrap();
+        unwrapped
+    }}
+}
+
+macro_rules! assert_roundtrip {
+    ($fun:expr, $string:expr) => {
+        assert_roundtrip!($fun, $string, $string);
+    };
+    ($fun:expr, $input:expr, $output:expr) => {
+        let mut input = ParserInput::new($input);
+        let mut parser = Parser::new(&mut input);
+        let parsed = $fun(&mut parser)
+                     .expect(&format!("Failed to parse {}", $input));
+        let serialized = ToCss::to_css_string(&parsed);
+        assert_eq!(serialized, $output);
+
+        let mut input = ParserInput::new(&serialized);
+        let mut parser = Parser::new(&mut input);
+        let re_parsed = $fun(&mut parser)
+                        .expect(&format!("Failed to parse serialization {}", $input));
+        let re_serialized = ToCss::to_css_string(&re_parsed);
+        assert_eq!(serialized, re_serialized)
+    }
+}
+
+macro_rules! assert_parser_exhausted {
+    ($fun:expr, $string:expr, $should_exhausted:expr) => {{
+        parse(|context, input| {
+            let parsed = $fun(context, input);
+            assert_eq!(parsed.is_ok(), true);
+            assert_eq!(input.is_exhausted(), $should_exhausted);
+            Ok(())
+        }, $string).unwrap()
+    }}
+}
+
+macro_rules! parse_longhand {
+    ($name:ident, $s:expr) => {
+         parse($name::parse, $s).unwrap()
+    };
+}
+
+mod animation;
+mod background;
+mod border;
+mod box_;
+mod column;
+mod effects;
+mod image;
+mod inherited_text;
+mod outline;
+mod position;
+mod selectors;
+mod supports;
+mod text_overflow;
+mod transition_duration;
+mod transition_timing_function;
diff --git a/servo/tests/unit/style/parsing/outline.rs b/servo/tests/unit/style/parsing/outline.rs
new file mode 100644
index 0000000000..6d909d9bc5
--- /dev/null
+++ b/servo/tests/unit/style/parsing/outline.rs
@@ -0,0 +1,26 @@
+/* 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/. */
+
+use parsing::parse;
+use style_traits::ToCss;
+
+#[test]
+fn test_outline_style() {
+    use style::properties::longhands::outline_style;
+
+    assert_roundtrip_with_context!(outline_style::parse, r#"auto"#);
+    assert_roundtrip_with_context!(outline_style::parse, r#"none"#);
+    assert_roundtrip_with_context!(outline_style::parse, r#"solid"#);
+    assert_roundtrip_with_context!(outline_style::parse, r#"double"#);
+    assert_roundtrip_with_context!(outline_style::parse, r#"dotted"#);
+    assert_roundtrip_with_context!(outline_style::parse, r#"dashed"#);
+    assert_roundtrip_with_context!(outline_style::parse, r#"groove"#);
+    assert_roundtrip_with_context!(outline_style::parse, r#"ridge"#);
+    assert_roundtrip_with_context!(outline_style::parse, r#"inset"#);
+    assert_roundtrip_with_context!(outline_style::parse, r#"outset"#);
+
+    // The outline-style property accepts the same values as border-style,
+    // except that 'hidden' is not a legal outline style.
+    assert!(parse(outline_style::parse, r#"hidden"#).is_err());
+}
diff --git a/servo/tests/unit/style/parsing/position.rs b/servo/tests/unit/style/parsing/position.rs
new file mode 100644
index 0000000000..ce73c7a0d2
--- /dev/null
+++ b/servo/tests/unit/style/parsing/position.rs
@@ -0,0 +1,145 @@
+/* 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/. */
+
+use parsing::{parse, parse_entirely};
+use style::parser::Parse;
+use style::values::specified::position::*;
+use style_traits::ToCss;
+
+#[test]
+fn test_position() {
+    // Serialization is not actually specced
+    // though these are the values expected by basic-shape
+    // https://github.com/w3c/csswg-drafts/issues/368
+    assert_roundtrip_with_context!(Position::parse, "center", "center center");
+    assert_roundtrip_with_context!(Position::parse, "top left", "left top");
+    assert_roundtrip_with_context!(Position::parse, "left top", "left top");
+    assert_roundtrip_with_context!(Position::parse, "top right", "right top");
+    assert_roundtrip_with_context!(Position::parse, "right top", "right top");
+    assert_roundtrip_with_context!(Position::parse, "bottom left", "left bottom");
+    assert_roundtrip_with_context!(Position::parse, "left bottom", "left bottom");
+    assert_roundtrip_with_context!(Position::parse, "left center", "left center");
+    assert_roundtrip_with_context!(Position::parse, "right center", "right center");
+    assert_roundtrip_with_context!(Position::parse, "center top", "center top");
+    assert_roundtrip_with_context!(Position::parse, "center bottom", "center bottom");
+    assert_roundtrip_with_context!(Position::parse, "center 10px", "center 10px");
+    assert_roundtrip_with_context!(Position::parse, "center 10%", "center 10%");
+    assert_roundtrip_with_context!(Position::parse, "right 10%", "right 10%");
+
+    // Only keywords can be reordered
+    assert!(parse_entirely(Position::parse, "top 40%").is_err());
+    assert!(parse_entirely(Position::parse, "40% left").is_err());
+
+    // 3 and 4 value serialization
+    assert_roundtrip_with_context!(Position::parse, "left 10px top 15px", "left 10px top 15px");
+    assert_roundtrip_with_context!(Position::parse, "top 15px left 10px", "left 10px top 15px");
+    assert_roundtrip_with_context!(Position::parse, "left 10% top 15px", "left 10% top 15px");
+    assert_roundtrip_with_context!(Position::parse, "top 15px left 10%", "left 10% top 15px");
+    assert_roundtrip_with_context!(Position::parse, "left top 15px", "left top 15px");
+    assert_roundtrip_with_context!(Position::parse, "top 15px left", "left top 15px");
+    assert_roundtrip_with_context!(Position::parse, "left 10px top", "left 10px top");
+    assert_roundtrip_with_context!(Position::parse, "top left 10px", "left 10px top");
+    assert_roundtrip_with_context!(Position::parse, "right 10px bottom", "right 10px bottom");
+    assert_roundtrip_with_context!(Position::parse, "bottom right 10px", "right 10px bottom");
+    assert_roundtrip_with_context!(Position::parse, "center right 10px", "right 10px center");
+    assert_roundtrip_with_context!(Position::parse, "center bottom 10px", "center bottom 10px");
+
+    // Invalid 3 value positions
+    assert!(parse_entirely(Position::parse, "20px 30px 20px").is_err());
+    assert!(parse_entirely(Position::parse, "top 30px 20px").is_err());
+    assert!(parse_entirely(Position::parse, "50% bottom 20%").is_err());
+
+    // Only horizontal and vertical keywords can have positions
+    assert!(parse_entirely(Position::parse, "center 10px left 15px").is_err());
+    assert!(parse_entirely(Position::parse, "center 10px 15px").is_err());
+    assert!(parse_entirely(Position::parse, "center 10px bottom").is_err());
+
+    // "Horizontal Horizontal" or "Vertical Vertical" positions cause error
+    assert!(parse_entirely(Position::parse, "left right").is_err());
+    assert!(parse_entirely(Position::parse, "left 10px right").is_err());
+    assert!(parse_entirely(Position::parse, "left 10px right 15%").is_err());
+    assert!(parse_entirely(Position::parse, "top bottom").is_err());
+    assert!(parse_entirely(Position::parse, "top 10px bottom").is_err());
+    assert!(parse_entirely(Position::parse, "top 10px bottom 15%").is_err());
+
+    // Logical keywords are not supported in Position yet.
+    assert!(parse(Position::parse, "x-start").is_err());
+    assert!(parse(Position::parse, "y-end").is_err());
+    assert!(parse(Position::parse, "x-start y-end").is_err());
+    assert!(parse(Position::parse, "x-end 10px").is_err());
+    assert!(parse(Position::parse, "y-start 20px").is_err());
+    assert!(parse(Position::parse, "x-start bottom 10%").is_err());
+    assert!(parse_entirely(Position::parse, "left y-start 10%").is_err());
+    assert!(parse(Position::parse, "x-start 20px y-end 10%").is_err());
+}
+
+#[test]
+fn test_horizontal_position() {
+    // One value serializations.
+    assert_roundtrip_with_context!(HorizontalPosition::parse, "20px", "20px");
+    assert_roundtrip_with_context!(HorizontalPosition::parse, "25%", "25%");
+    assert_roundtrip_with_context!(HorizontalPosition::parse, "center", "center");
+    assert_roundtrip_with_context!(HorizontalPosition::parse, "left", "left");
+    assert_roundtrip_with_context!(HorizontalPosition::parse, "right", "right");
+
+    // Two value serializations.
+    assert_roundtrip_with_context!(HorizontalPosition::parse, "right 10px", "right 10px");
+
+    // Invalid horizontal positions.
+    assert!(parse(HorizontalPosition::parse, "top").is_err());
+    assert!(parse(HorizontalPosition::parse, "bottom").is_err());
+    assert!(parse(HorizontalPosition::parse, "y-start").is_err());
+    assert!(parse(HorizontalPosition::parse, "y-end").is_err());
+    assert!(parse(HorizontalPosition::parse, "y-end 20px ").is_err());
+    assert!(parse(HorizontalPosition::parse, "bottom 20px").is_err());
+    assert!(parse(HorizontalPosition::parse, "bottom top").is_err());
+    assert!(parse_entirely(HorizontalPosition::parse, "20px y-end").is_err());
+    assert!(parse_entirely(HorizontalPosition::parse, "20px top").is_err());
+    assert!(parse_entirely(HorizontalPosition::parse, "left center").is_err());
+    assert!(parse_entirely(HorizontalPosition::parse, "left top").is_err());
+    assert!(parse_entirely(HorizontalPosition::parse, "left right").is_err());
+    assert!(parse_entirely(HorizontalPosition::parse, "20px 30px").is_err());
+    assert!(parse_entirely(HorizontalPosition::parse, "10px left").is_err());
+    assert!(parse_entirely(HorizontalPosition::parse, "x-end 20%").is_err());
+    assert!(parse_entirely(HorizontalPosition::parse, "20px x-start").is_err());
+
+    // Logical keywords are not supported in Position yet.
+    assert!(parse(HorizontalPosition::parse, "x-start").is_err());
+    assert!(parse(HorizontalPosition::parse, "x-end").is_err());
+}
+
+#[test]
+fn test_vertical_position() {
+    // One value serializations.
+    assert_roundtrip_with_context!(VerticalPosition::parse, "20px", "20px");
+    assert_roundtrip_with_context!(VerticalPosition::parse, "25%", "25%");
+    assert_roundtrip_with_context!(VerticalPosition::parse, "center", "center");
+    assert_roundtrip_with_context!(VerticalPosition::parse, "top", "top");
+    assert_roundtrip_with_context!(VerticalPosition::parse, "bottom", "bottom");
+
+    // Two value serializations.
+    assert_roundtrip_with_context!(VerticalPosition::parse, "bottom 10px", "bottom 10px");
+
+    // Invalid vertical positions.
+    assert!(parse(VerticalPosition::parse, "left").is_err());
+    assert!(parse(VerticalPosition::parse, "right").is_err());
+    assert!(parse(VerticalPosition::parse, "x-start").is_err());
+    assert!(parse(VerticalPosition::parse, "x-end").is_err());
+    assert!(parse(VerticalPosition::parse, "x-end 20px").is_err());
+    assert!(parse(VerticalPosition::parse, "left 20px").is_err());
+    assert!(parse(VerticalPosition::parse, "left center").is_err());
+    assert!(parse(VerticalPosition::parse, "left top").is_err());
+    assert!(parse(VerticalPosition::parse, "left right").is_err());
+    assert!(parse_entirely(VerticalPosition::parse, "20px x-end").is_err());
+    assert!(parse_entirely(VerticalPosition::parse, "20px right").is_err());
+    assert!(parse_entirely(VerticalPosition::parse, "bottom top").is_err());
+    assert!(parse_entirely(VerticalPosition::parse, "20px 30px").is_err());
+    assert!(parse_entirely(VerticalPosition::parse, "10px top").is_err());
+    assert!(parse_entirely(VerticalPosition::parse, "y-end 20%").is_err());
+    assert!(parse_entirely(VerticalPosition::parse, "20px y-start").is_err());
+
+    // Logical keywords are not supported in Position yet.
+    assert!(parse(VerticalPosition::parse, "y-start").is_err());
+    assert!(parse(VerticalPosition::parse, "y-end").is_err());
+}
diff --git a/servo/tests/unit/style/parsing/selectors.rs b/servo/tests/unit/style/parsing/selectors.rs
new file mode 100644
index 0000000000..a1e85bd20d
--- /dev/null
+++ b/servo/tests/unit/style/parsing/selectors.rs
@@ -0,0 +1,30 @@
+/* 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/. */
+
+use cssparser::{Parser, ParserInput, ToCss};
+use selectors::parser::SelectorList;
+use style::selector_parser::{SelectorImpl, SelectorParser};
+use style::stylesheets::{Origin, Namespaces};
+use style_traits::ParseError;
+
+fn parse_selector<'i, 't>(input: &mut Parser<'i, 't>) -> Result<SelectorList<SelectorImpl>, ParseError<'i>> {
+    let mut ns = Namespaces::default();
+    ns.prefixes.insert("svg".into(), ns!(svg));
+    let parser = SelectorParser {
+        stylesheet_origin: Origin::UserAgent,
+        namespaces: &ns,
+        url_data: None,
+    };
+    SelectorList::parse(&parser, input)
+}
+
+#[test]
+fn test_selectors() {
+    assert_roundtrip!(parse_selector, "div");
+    assert_roundtrip!(parse_selector, "svg|circle");
+    assert_roundtrip!(parse_selector, "p:before", "p::before");
+    assert_roundtrip!(parse_selector, "[border=\"0\"]:-servo-nonzero-border ~ ::-servo-details-summary");
+    assert_roundtrip!(parse_selector, "* > *");
+    assert_roundtrip!(parse_selector, "*|* + *", "* + *");
+}
diff --git a/servo/tests/unit/style/parsing/supports.rs b/servo/tests/unit/style/parsing/supports.rs
new file mode 100644
index 0000000000..15e948b73e
--- /dev/null
+++ b/servo/tests/unit/style/parsing/supports.rs
@@ -0,0 +1,16 @@
+/* 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/. */
+
+use cssparser::{Parser, ParserInput};
+use style::stylesheets::supports_rule::SupportsCondition;
+use style_traits::ToCss;
+
+#[test]
+fn test_supports_condition() {
+    assert_roundtrip!(SupportsCondition::parse, "(margin: 1px)");
+    assert_roundtrip!(SupportsCondition::parse, "not (--be: to be)");
+    assert_roundtrip!(SupportsCondition::parse, "(color: blue) and future-extension(4)");
+    assert_roundtrip!(SupportsCondition::parse, "future-\\1 extension(4)");
+    assert_roundtrip!(SupportsCondition::parse, "((test))");
+}
diff --git a/servo/tests/unit/style/parsing/text_overflow.rs b/servo/tests/unit/style/parsing/text_overflow.rs
new file mode 100644
index 0000000000..505e6ffb8c
--- /dev/null
+++ b/servo/tests/unit/style/parsing/text_overflow.rs
@@ -0,0 +1,30 @@
+/* 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/. */
+
+use parsing::parse;
+use style_traits::ToCss;
+
+#[test]
+fn test_text_overflow() {
+    use style::properties::longhands::text_overflow;
+
+    assert_roundtrip_with_context!(text_overflow::parse, r#"clip"#);
+    assert_roundtrip_with_context!(text_overflow::parse, r#"ellipsis"#);
+    assert_roundtrip_with_context!(text_overflow::parse, r#"clip ellipsis"#);
+    assert_roundtrip_with_context!(text_overflow::parse, r#""x""#);
+    assert_roundtrip_with_context!(text_overflow::parse, r#"'x'"#, r#""x""#);
+    assert_roundtrip_with_context!(text_overflow::parse, r#"clip "x""#);
+    assert_roundtrip_with_context!(text_overflow::parse, r#""x" clip"#);
+    assert_roundtrip_with_context!(text_overflow::parse, r#""x" "y""#);
+}
+
+#[test]
+fn test_text_overflow_parser_exhaustion() {
+    use style::properties::longhands::text_overflow;
+
+    assert_parser_exhausted!(text_overflow::parse, r#"clip rubbish"#, false);
+    assert_parser_exhausted!(text_overflow::parse, r#"clip"#, true);
+    assert_parser_exhausted!(text_overflow::parse, r#"ellipsis"#, true);
+    assert_parser_exhausted!(text_overflow::parse, r#"clip ellipsis"#, true);
+}
diff --git a/servo/tests/unit/style/parsing/transition_duration.rs b/servo/tests/unit/style/parsing/transition_duration.rs
new file mode 100644
index 0000000000..c771a58944
--- /dev/null
+++ b/servo/tests/unit/style/parsing/transition_duration.rs
@@ -0,0 +1,17 @@
+/* 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/. */
+
+use parsing::parse;
+use style::properties::longhands::transition_duration;
+
+#[test]
+fn test_positive_transition_duration() {
+    assert!(parse(transition_duration::parse, "5s").is_ok());
+    assert!(parse(transition_duration::parse, "0s").is_ok());
+}
+
+#[test]
+fn test_negative_transition_duration() {
+    assert!(parse(transition_duration::parse, "-5s").is_err());
+}
diff --git a/servo/tests/unit/style/parsing/transition_timing_function.rs b/servo/tests/unit/style/parsing/transition_timing_function.rs
new file mode 100644
index 0000000000..2d22f24459
--- /dev/null
+++ b/servo/tests/unit/style/parsing/transition_timing_function.rs
@@ -0,0 +1,37 @@
+/* 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/. */
+
+use parsing::parse;
+use style::properties::longhands::transition_timing_function;
+use style_traits::ToCss;
+
+#[test]
+fn test_cubic_bezier() {
+    assert_roundtrip_with_context!(transition_timing_function::parse, "cubic-bezier(0, 0, 0, 0)");
+    assert_roundtrip_with_context!(transition_timing_function::parse, "cubic-bezier(0.25, 0, 0.5, 0)");
+    assert_roundtrip_with_context!(transition_timing_function::parse, "cubic-bezier(1, 1, 1, 1)");
+
+    // p1x and p2x values must be in range [0, 1]
+    assert!(parse(transition_timing_function::parse, "cubic-bezier(-1, 0, 0, 0").is_err());
+    assert!(parse(transition_timing_function::parse, "cubic-bezier(0, 0, -1, 0").is_err());
+    assert!(parse(transition_timing_function::parse, "cubic-bezier(-1, 0, -1, 0").is_err());
+
+    assert!(parse(transition_timing_function::parse, "cubic-bezier(2, 0, 0, 0").is_err());
+    assert!(parse(transition_timing_function::parse, "cubic-bezier(0, 0, 2, 0").is_err());
+    assert!(parse(transition_timing_function::parse, "cubic-bezier(2, 0, 2, 0").is_err());
+}
+
+#[test]
+fn test_steps() {
+    assert_roundtrip_with_context!(transition_timing_function::parse, "steps(1)");
+    assert_roundtrip_with_context!(transition_timing_function::parse, "steps(  1)", "steps(1)");
+    assert_roundtrip_with_context!(transition_timing_function::parse, "steps(1, start)");
+    assert_roundtrip_with_context!(transition_timing_function::parse, "steps(2, end) ", "steps(2)");
+
+    // Step interval value must be an integer greater than 0
+    assert!(parse(transition_timing_function::parse, "steps(0)").is_err());
+    assert!(parse(transition_timing_function::parse, "steps(0.5)").is_err());
+    assert!(parse(transition_timing_function::parse, "steps(-1)").is_err());
+    assert!(parse(transition_timing_function::parse, "steps(1, middle)").is_err());
+}
diff --git a/servo/tests/unit/style/properties/mod.rs b/servo/tests/unit/style/properties/mod.rs
new file mode 100644
index 0000000000..bfb6402692
--- /dev/null
+++ b/servo/tests/unit/style/properties/mod.rs
@@ -0,0 +1,66 @@
+/* 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/. */
+
+use cssparser::{Parser, ParserInput};
+use style::context::QuirksMode;
+use style::parser::ParserContext;
+use style::stylesheets::{CssRuleType, Origin};
+use style_traits::{ParsingMode, ParseError};
+
+fn parse<T, F>(f: F, s: &'static str) -> Result<T, ParseError<'static>>
+where
+    F: for<'t> Fn(
+        &ParserContext,
+        &mut Parser<'static, 't>,
+    ) -> Result<T, ParseError<'static>>
+{
+    let mut input = ParserInput::new(s);
+    parse_input(f, &mut input)
+}
+
+fn parse_input<'i: 't, 't, T, F>(f: F, input: &'t mut ParserInput<'i>) -> Result<T, ParseError<'i>>
+where
+    F: Fn(&ParserContext, &mut Parser<'i, 't>) -> Result<T, ParseError<'i>>,
+{
+    let url = ::servo_url::ServoUrl::parse("http://localhost").unwrap();
+    let context = ParserContext::new(
+        Origin::Author,
+        &url,
+        Some(CssRuleType::Style),
+        ParsingMode::DEFAULT,
+        QuirksMode::NoQuirks,
+        None,
+        None,
+    );
+    let mut parser = Parser::new(input);
+    f(&context, &mut parser)
+}
+
+macro_rules! assert_roundtrip_with_context {
+    ($fun:expr, $string:expr) => {
+        assert_roundtrip_with_context!($fun, $string, $string);
+    };
+    ($fun:expr, $input:expr, $output:expr) => {{
+        let serialized = parse(|context, i| {
+            let parsed = $fun(context, i)
+                         .expect(&format!("Failed to parse {}", $input));
+            let serialized = ToCss::to_css_string(&parsed);
+            assert_eq!(serialized, $output);
+            Ok(serialized)
+        }, $input).unwrap();
+
+        let mut input = ::cssparser::ParserInput::new(&serialized);
+        let unwrapped = parse_input(|context, i| {
+            let re_parsed = $fun(context, i)
+                            .expect(&format!("Failed to parse serialization {}", $input));
+            let re_serialized = ToCss::to_css_string(&re_parsed);
+            assert_eq!(serialized, re_serialized);
+            Ok(())
+        }, &mut input).unwrap();
+        unwrapped
+    }}
+}
+
+mod scaffolding;
+mod serialization;
diff --git a/servo/tests/unit/style/properties/scaffolding.rs b/servo/tests/unit/style/properties/scaffolding.rs
new file mode 100644
index 0000000000..7c09f51176
--- /dev/null
+++ b/servo/tests/unit/style/properties/scaffolding.rs
@@ -0,0 +1,59 @@
+/* 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/. */
+
+use serde_json::{self, Value};
+use std::env;
+use std::fs::{File, remove_file};
+use std::path::Path;
+use std::process::Command;
+
+#[test]
+fn properties_list_json() {
+    let top = Path::new(&env::var("CARGO_MANIFEST_DIR").unwrap()).join("..").join("..").join("..");
+    let json = top.join("target").join("doc").join("servo").join("css-properties.json");
+    if json.exists() {
+        remove_file(&json).unwrap()
+    }
+    let python = env::var("PYTHON").ok().unwrap_or_else(find_python);
+    let script = top.join("components").join("style").join("properties").join("build.py");
+    let status = Command::new(python)
+        .arg(&script)
+        .arg("servo")
+        .arg("html")
+        .arg("regular")
+        .status()
+        .unwrap();
+    assert!(status.success(), "{:?}", status);
+
+    let properties: Value = serde_json::from_reader(File::open(json).unwrap()).unwrap();
+    assert!(properties.as_object().unwrap().len() > 100);
+    assert!(properties.as_object().unwrap().contains_key("margin"));
+    assert!(properties.as_object().unwrap().contains_key("margin-top"));
+}
+
+#[cfg(windows)]
+fn find_python() -> String {
+    if Command::new("python2.7.exe").arg("--version").output().is_ok() {
+        return "python2.7.exe".to_owned();
+    }
+
+    if Command::new("python27.exe").arg("--version").output().is_ok() {
+        return "python27.exe".to_owned();
+    }
+
+    if Command::new("python.exe").arg("--version").output().is_ok() {
+        return "python.exe".to_owned();
+    }
+
+    panic!("Can't find python (tried python27.exe and python.exe)! Try fixing PATH or setting the PYTHON env var");
+}
+
+#[cfg(not(windows))]
+fn find_python() -> String {
+    if Command::new("python2.7").arg("--version").output().unwrap().status.success() {
+        "python2.7"
+    } else {
+        "python"
+    }.to_owned()
+}
diff --git a/servo/tests/unit/style/properties/serialization.rs b/servo/tests/unit/style/properties/serialization.rs
new file mode 100644
index 0000000000..fe1d158153
--- /dev/null
+++ b/servo/tests/unit/style/properties/serialization.rs
@@ -0,0 +1,731 @@
+/* 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/. */
+
+use properties::{parse, parse_input};
+use style::computed_values::display::T as Display;
+use style::properties::{PropertyDeclaration, Importance};
+use style::properties::declaration_block::PropertyDeclarationBlock;
+use style::properties::parse_property_declaration_list;
+use style::values::RGBA;
+use style::values::specified::{BorderStyle, BorderSideWidth, Color};
+use style::values::specified::{Length, LengthPercentage, LengthPercentageOrAuto};
+use style::values::specified::NoCalcLength;
+use style::values::specified::url::SpecifiedUrl;
+use style_traits::ToCss;
+use stylesheets::block_from;
+
+trait ToCssString {
+    fn to_css_string(&self) -> String;
+}
+
+impl ToCssString for PropertyDeclarationBlock {
+    fn to_css_string(&self) -> String {
+        let mut css = String::new();
+        self.to_css(&mut css).unwrap();
+        css
+    }
+}
+
+#[test]
+fn property_declaration_block_should_serialize_correctly() {
+    use style::properties::longhands::overflow_x::SpecifiedValue as OverflowValue;
+
+    let declarations = vec![
+        (PropertyDeclaration::Width(
+            LengthPercentageOrAuto::Length(NoCalcLength::from_px(70f32))),
+         Importance::Normal),
+
+        (PropertyDeclaration::MinHeight(
+            LengthPercentage::Length(NoCalcLength::from_px(20f32))),
+         Importance::Normal),
+
+        (PropertyDeclaration::Height(
+            LengthPercentageOrAuto::Length(NoCalcLength::from_px(20f32))),
+         Importance::Important),
+
+        (PropertyDeclaration::Display(Display::InlineBlock),
+         Importance::Normal),
+
+        (PropertyDeclaration::OverflowX(
+            OverflowValue::Auto),
+         Importance::Normal),
+
+        (PropertyDeclaration::OverflowY(
+            OverflowValue::Auto),
+         Importance::Normal),
+    ];
+
+    let block = block_from(declarations);
+
+    let css_string = block.to_css_string();
+
+    assert_eq!(
+        css_string,
+        "width: 70px; min-height: 20px; height: 20px !important; display: inline-block; overflow: auto;"
+    );
+}
+
+mod shorthand_serialization {
+    pub use super::*;
+
+    pub fn shorthand_properties_to_string(properties: Vec<PropertyDeclaration>) -> String {
+        let block = block_from(properties.into_iter().map(|d| (d, Importance::Normal)));
+
+        block.to_css_string()
+    }
+
+    mod four_sides_shorthands {
+        pub use super::*;
+
+        // we can use margin as a base to test out the different combinations
+        // but afterwards, we only need to to one test per "four sides shorthand"
+        #[test]
+        fn all_equal_properties_should_serialize_to_one_value() {
+            let mut properties = Vec::new();
+
+            let px_70 = LengthPercentageOrAuto::Length(NoCalcLength::from_px(70f32));
+            properties.push(PropertyDeclaration::MarginTop(px_70.clone()));
+            properties.push(PropertyDeclaration::MarginRight(px_70.clone()));
+            properties.push(PropertyDeclaration::MarginBottom(px_70.clone()));
+            properties.push(PropertyDeclaration::MarginLeft(px_70));
+
+            let serialization = shorthand_properties_to_string(properties);
+            assert_eq!(serialization, "margin: 70px;");
+        }
+
+        #[test]
+        fn equal_vertical_and_equal_horizontal_properties_should_serialize_to_two_value() {
+            let mut properties = Vec::new();
+
+            let vertical_px = LengthPercentageOrAuto::Length(NoCalcLength::from_px(10f32));
+            let horizontal_px = LengthPercentageOrAuto::Length(NoCalcLength::from_px(5f32));
+
+            properties.push(PropertyDeclaration::MarginTop(vertical_px.clone()));
+            properties.push(PropertyDeclaration::MarginRight(horizontal_px.clone()));
+            properties.push(PropertyDeclaration::MarginBottom(vertical_px));
+            properties.push(PropertyDeclaration::MarginLeft(horizontal_px));
+
+            let serialization = shorthand_properties_to_string(properties);
+            assert_eq!(serialization, "margin: 10px 5px;");
+        }
+
+        #[test]
+        fn different_vertical_and_equal_horizontal_properties_should_serialize_to_three_values() {
+            let mut properties = Vec::new();
+
+            let top_px = LengthPercentageOrAuto::Length(NoCalcLength::from_px(8f32));
+            let bottom_px = LengthPercentageOrAuto::Length(NoCalcLength::from_px(10f32));
+            let horizontal_px = LengthPercentageOrAuto::Length(NoCalcLength::from_px(5f32));
+
+            properties.push(PropertyDeclaration::MarginTop(top_px));
+            properties.push(PropertyDeclaration::MarginRight(horizontal_px.clone()));
+            properties.push(PropertyDeclaration::MarginBottom(bottom_px));
+            properties.push(PropertyDeclaration::MarginLeft(horizontal_px));
+
+            let serialization = shorthand_properties_to_string(properties);
+            assert_eq!(serialization, "margin: 8px 5px 10px;");
+        }
+
+        #[test]
+        fn different_properties_should_serialize_to_four_values() {
+            let mut properties = Vec::new();
+
+            let top_px = LengthPercentageOrAuto::Length(NoCalcLength::from_px(8f32));
+            let right_px = LengthPercentageOrAuto::Length(NoCalcLength::from_px(12f32));
+            let bottom_px = LengthPercentageOrAuto::Length(NoCalcLength::from_px(10f32));
+            let left_px = LengthPercentageOrAuto::Length(NoCalcLength::from_px(14f32));
+
+            properties.push(PropertyDeclaration::MarginTop(top_px));
+            properties.push(PropertyDeclaration::MarginRight(right_px));
+            properties.push(PropertyDeclaration::MarginBottom(bottom_px));
+            properties.push(PropertyDeclaration::MarginLeft(left_px));
+
+            let serialization = shorthand_properties_to_string(properties);
+            assert_eq!(serialization, "margin: 8px 12px 10px 14px;");
+        }
+
+        #[test]
+        fn different_longhands_should_serialize_to_long_form() {
+          let mut properties = Vec::new();
+
+          let solid = BorderStyle::Solid;
+
+          properties.push(PropertyDeclaration::BorderTopStyle(solid.clone()));
+          properties.push(PropertyDeclaration::BorderRightStyle(solid.clone()));
+          properties.push(PropertyDeclaration::BorderBottomStyle(solid.clone()));
+          properties.push(PropertyDeclaration::BorderLeftStyle(solid.clone()));
+
+          let px_30 = BorderSideWidth::Length(Length::from_px(30f32));
+          let px_10 = BorderSideWidth::Length(Length::from_px(10f32));
+
+          properties.push(PropertyDeclaration::BorderTopWidth(px_30.clone()));
+          properties.push(PropertyDeclaration::BorderRightWidth(px_30.clone()));
+          properties.push(PropertyDeclaration::BorderBottomWidth(px_30.clone()));
+          properties.push(PropertyDeclaration::BorderLeftWidth(px_10.clone()));
+
+          let blue = Color::rgba(RGBA::new(0, 0, 255, 255));
+
+          properties.push(PropertyDeclaration::BorderTopColor(blue.clone()));
+          properties.push(PropertyDeclaration::BorderRightColor(blue.clone()));
+          properties.push(PropertyDeclaration::BorderBottomColor(blue.clone()));
+          properties.push(PropertyDeclaration::BorderLeftColor(blue.clone()));
+
+          let serialization = shorthand_properties_to_string(properties);
+          assert_eq!(serialization,
+          "border-style: solid; border-width: 30px 30px 30px 10px; border-color: rgb(0, 0, 255);");
+        }
+
+        #[test]
+        fn same_longhands_should_serialize_correctly() {
+          let mut properties = Vec::new();
+
+          let solid = BorderStyle::Solid;
+
+          properties.push(PropertyDeclaration::BorderTopStyle(solid.clone()));
+          properties.push(PropertyDeclaration::BorderRightStyle(solid.clone()));
+          properties.push(PropertyDeclaration::BorderBottomStyle(solid.clone()));
+          properties.push(PropertyDeclaration::BorderLeftStyle(solid.clone()));
+
+          let px_30 = BorderSideWidth::Length(Length::from_px(30f32));
+
+          properties.push(PropertyDeclaration::BorderTopWidth(px_30.clone()));
+          properties.push(PropertyDeclaration::BorderRightWidth(px_30.clone()));
+          properties.push(PropertyDeclaration::BorderBottomWidth(px_30.clone()));
+          properties.push(PropertyDeclaration::BorderLeftWidth(px_30.clone()));
+
+          let blue = Color::rgba(RGBA::new(0, 0, 255, 255));
+
+          properties.push(PropertyDeclaration::BorderTopColor(blue.clone()));
+          properties.push(PropertyDeclaration::BorderRightColor(blue.clone()));
+          properties.push(PropertyDeclaration::BorderBottomColor(blue.clone()));
+          properties.push(PropertyDeclaration::BorderLeftColor(blue.clone()));
+
+          let serialization = shorthand_properties_to_string(properties);
+          assert_eq!(serialization, "border-style: solid; border-width: 30px; border-color: rgb(0, 0, 255);");
+        }
+
+        #[test]
+        fn padding_should_serialize_correctly() {
+            use style::values::specified::NonNegativeLengthPercentage;
+
+            let mut properties = Vec::new();
+
+            let px_10: NonNegativeLengthPercentage = NoCalcLength::from_px(10f32).into();
+            let px_15: NonNegativeLengthPercentage = NoCalcLength::from_px(15f32).into();
+            properties.push(PropertyDeclaration::PaddingTop(px_10.clone()));
+            properties.push(PropertyDeclaration::PaddingRight(px_15.clone()));
+            properties.push(PropertyDeclaration::PaddingBottom(px_10));
+            properties.push(PropertyDeclaration::PaddingLeft(px_15));
+
+            let serialization = shorthand_properties_to_string(properties);
+            assert_eq!(serialization, "padding: 10px 15px;");
+        }
+
+        #[test]
+        fn border_width_should_serialize_correctly() {
+            let mut properties = Vec::new();
+
+            let top_px = BorderSideWidth::Length(Length::from_px(10f32));
+            let bottom_px = BorderSideWidth::Length(Length::from_px(10f32));
+
+            let right_px = BorderSideWidth::Length(Length::from_px(15f32));
+            let left_px = BorderSideWidth::Length(Length::from_px(15f32));
+
+            properties.push(PropertyDeclaration::BorderTopWidth(top_px));
+            properties.push(PropertyDeclaration::BorderRightWidth(right_px));
+            properties.push(PropertyDeclaration::BorderBottomWidth(bottom_px));
+            properties.push(PropertyDeclaration::BorderLeftWidth(left_px));
+
+            let serialization = shorthand_properties_to_string(properties);
+            assert_eq!(serialization, "border-width: 10px 15px;");
+        }
+
+        #[test]
+        fn border_width_with_keywords_should_serialize_correctly() {
+            let mut properties = Vec::new();
+
+            let top_px = BorderSideWidth::Thin;
+            let right_px = BorderSideWidth::Medium;
+            let bottom_px = BorderSideWidth::Thick;
+            let left_px = BorderSideWidth::Length(Length::from_px(15f32));
+
+            properties.push(PropertyDeclaration::BorderTopWidth(top_px));
+            properties.push(PropertyDeclaration::BorderRightWidth(right_px));
+            properties.push(PropertyDeclaration::BorderBottomWidth(bottom_px));
+            properties.push(PropertyDeclaration::BorderLeftWidth(left_px));
+
+            let serialization = shorthand_properties_to_string(properties);
+            assert_eq!(serialization, "border-width: thin medium thick 15px;");
+        }
+
+        #[test]
+        fn border_color_should_serialize_correctly() {
+            let mut properties = Vec::new();
+
+            let red = Color::rgba(RGBA::new(255, 0, 0, 255));
+            let blue = Color::rgba(RGBA::new(0, 0, 255, 255));
+
+            properties.push(PropertyDeclaration::BorderTopColor(blue.clone()));
+            properties.push(PropertyDeclaration::BorderRightColor(red.clone()));
+            properties.push(PropertyDeclaration::BorderBottomColor(blue));
+            properties.push(PropertyDeclaration::BorderLeftColor(red));
+
+            let serialization = shorthand_properties_to_string(properties);
+
+            // TODO: Make the rgb test show border-color as blue red instead of below tuples
+            assert_eq!(serialization, "border-color: rgb(0, 0, 255) rgb(255, 0, 0);");
+        }
+
+        #[test]
+        fn border_style_should_serialize_correctly() {
+            let mut properties = Vec::new();
+
+            let solid = BorderStyle::Solid;
+            let dotted = BorderStyle::Dotted;
+            properties.push(PropertyDeclaration::BorderTopStyle(solid.clone()));
+            properties.push(PropertyDeclaration::BorderRightStyle(dotted.clone()));
+            properties.push(PropertyDeclaration::BorderBottomStyle(solid));
+            properties.push(PropertyDeclaration::BorderLeftStyle(dotted));
+
+            let serialization = shorthand_properties_to_string(properties);
+            assert_eq!(serialization, "border-style: solid dotted;");
+        }
+
+        use style::values::specified::{BorderCornerRadius, Percentage};
+
+        #[test]
+        fn border_radius_should_serialize_correctly() {
+            let mut properties = Vec::new();
+            properties.push(PropertyDeclaration::BorderTopLeftRadius(Box::new(BorderCornerRadius::new(
+                Percentage::new(0.01).into(), Percentage::new(0.05).into()
+            ))));
+            properties.push(PropertyDeclaration::BorderTopRightRadius(Box::new(BorderCornerRadius::new(
+                Percentage::new(0.02).into(), Percentage::new(0.06).into()
+            ))));
+            properties.push(PropertyDeclaration::BorderBottomRightRadius(Box::new(BorderCornerRadius::new(
+                Percentage::new(0.03).into(), Percentage::new(0.07).into()
+            ))));
+            properties.push(PropertyDeclaration::BorderBottomLeftRadius(Box::new(BorderCornerRadius::new(
+                Percentage::new(0.04).into(), Percentage::new(0.08).into()
+            ))));
+
+            let serialization = shorthand_properties_to_string(properties);
+            assert_eq!(serialization, "border-radius: 1% 2% 3% 4% / 5% 6% 7% 8%;");
+        }
+    }
+
+
+    mod border_shorthands {
+        use super::*;
+
+        #[test]
+        fn border_top_and_color() {
+            let mut properties = Vec::new();
+            properties.push(PropertyDeclaration::BorderTopWidth(BorderSideWidth::Length(Length::from_px(1.))));
+            properties.push(PropertyDeclaration::BorderTopStyle(BorderStyle::Solid));
+            let c = Color::Numeric {
+                parsed: RGBA::new(255, 0, 0, 255),
+                authored: Some("green".to_string().into_boxed_str())
+            };
+            properties.push(PropertyDeclaration::BorderTopColor(c));
+            let c = Color::Numeric {
+                parsed: RGBA::new(0, 255, 0, 255),
+                authored: Some("red".to_string().into_boxed_str())
+            };
+            properties.push(PropertyDeclaration::BorderTopColor(c.clone()));
+            properties.push(PropertyDeclaration::BorderBottomColor(c.clone()));
+            properties.push(PropertyDeclaration::BorderLeftColor(c.clone()));
+            properties.push(PropertyDeclaration::BorderRightColor(c.clone()));
+
+            let serialization = shorthand_properties_to_string(properties);
+            assert_eq!(serialization, "border-top: 1px solid red; border-color: red;");
+        }
+
+        #[test]
+        fn border_color_and_top() {
+            let mut properties = Vec::new();
+                let c = Color::Numeric {
+                parsed: RGBA::new(0, 255, 0, 255),
+                authored: Some("red".to_string().into_boxed_str())
+            };
+            properties.push(PropertyDeclaration::BorderTopColor(c.clone()));
+            properties.push(PropertyDeclaration::BorderBottomColor(c.clone()));
+            properties.push(PropertyDeclaration::BorderLeftColor(c.clone()));
+            properties.push(PropertyDeclaration::BorderRightColor(c.clone()));
+
+            properties.push(PropertyDeclaration::BorderTopWidth(BorderSideWidth::Length(Length::from_px(1.))));
+            properties.push(PropertyDeclaration::BorderTopStyle(BorderStyle::Solid));
+            let c = Color::Numeric {
+                parsed: RGBA::new(255, 0, 0, 255),
+                authored: Some("green".to_string().into_boxed_str())
+            };
+            properties.push(PropertyDeclaration::BorderTopColor(c));
+
+            let serialization = shorthand_properties_to_string(properties);
+            assert_eq!(serialization, "border-color: green red red; border-top: 1px solid green;");
+        }
+
+        // we can use border-top as a base to test out the different combinations
+        // but afterwards, we only need to to one test per "directional border shorthand"
+
+        #[test]
+        fn directional_border_should_show_all_properties_when_values_are_set() {
+            let mut properties = Vec::new();
+
+            let width = BorderSideWidth::Length(Length::from_px(4f32));
+            let style = BorderStyle::Solid;
+            let color = RGBA::new(255, 0, 0, 255).into();
+
+            properties.push(PropertyDeclaration::BorderTopWidth(width));
+            properties.push(PropertyDeclaration::BorderTopStyle(style));
+            properties.push(PropertyDeclaration::BorderTopColor(color));
+
+            let serialization = shorthand_properties_to_string(properties);
+            assert_eq!(serialization, "border-top: 4px solid rgb(255, 0, 0);");
+        }
+
+        fn get_border_property_values() -> (BorderSideWidth, BorderStyle, Color) {
+            (BorderSideWidth::Length(Length::from_px(4f32)),
+             BorderStyle::Solid,
+             Color::currentcolor())
+        }
+
+        #[test]
+        fn border_top_should_serialize_correctly() {
+            let mut properties = Vec::new();
+            let (width, style, color) = get_border_property_values();
+            properties.push(PropertyDeclaration::BorderTopWidth(width));
+            properties.push(PropertyDeclaration::BorderTopStyle(style));
+            properties.push(PropertyDeclaration::BorderTopColor(color));
+
+            let serialization = shorthand_properties_to_string(properties);
+            assert_eq!(serialization, "border-top: 4px solid;");
+        }
+
+        #[test]
+        fn border_right_should_serialize_correctly() {
+            let mut properties = Vec::new();
+            let (width, style, color) = get_border_property_values();
+            properties.push(PropertyDeclaration::BorderRightWidth(width));
+            properties.push(PropertyDeclaration::BorderRightStyle(style));
+            properties.push(PropertyDeclaration::BorderRightColor(color));
+
+            let serialization = shorthand_properties_to_string(properties);
+            assert_eq!(serialization, "border-right: 4px solid;");
+        }
+
+        #[test]
+        fn border_bottom_should_serialize_correctly() {
+            let mut properties = Vec::new();
+            let (width, style, color) = get_border_property_values();
+            properties.push(PropertyDeclaration::BorderBottomWidth(width));
+            properties.push(PropertyDeclaration::BorderBottomStyle(style));
+            properties.push(PropertyDeclaration::BorderBottomColor(color));
+
+            let serialization = shorthand_properties_to_string(properties);
+            assert_eq!(serialization, "border-bottom: 4px solid;");
+        }
+
+        #[test]
+        fn border_left_should_serialize_correctly() {
+            let mut properties = Vec::new();
+            let (width, style, color) = get_border_property_values();
+            properties.push(PropertyDeclaration::BorderLeftWidth(width));
+            properties.push(PropertyDeclaration::BorderLeftStyle(style));
+            properties.push(PropertyDeclaration::BorderLeftColor(color));
+
+            let serialization = shorthand_properties_to_string(properties);
+            assert_eq!(serialization, "border-left: 4px solid;");
+        }
+
+        #[test]
+        fn border_should_serialize_correctly() {
+            // According to https://drafts.csswg.org/css-backgrounds-3/#the-border-shorthands,
+            // the ‘border’ shorthand resets ‘border-image’ to its initial value. To verify the
+            // serialization of 'border' shorthand, we need to set 'border-image' as well.
+            let block_text = "\
+                border-top: 4px solid; \
+                border-right: 4px solid; \
+                border-bottom: 4px solid; \
+                border-left: 4px solid; \
+                border-image: none;";
+
+            let block = parse(|c, i| Ok(parse_property_declaration_list(c, i)), block_text).unwrap();
+
+            let serialization = block.to_css_string();
+
+            assert_eq!(serialization, "border: 4px solid;");
+        }
+    }
+
+    mod background {
+        use super::*;
+
+        #[test]
+        fn background_should_serialize_all_available_properties_when_specified() {
+            let block_text = "\
+                background-color: rgb(255, 0, 0); \
+                background-image: url(\"http://servo/test.png\"); \
+                background-repeat: repeat-x; \
+                background-attachment: scroll; \
+                background-size: 70px 50px; \
+                background-position-x: 7px; \
+                background-position-y: bottom 4px; \
+                background-origin: border-box; \
+                background-clip: padding-box;";
+
+            let block = parse(|c, i| Ok(parse_property_declaration_list(c, i)), block_text).unwrap();
+
+            let serialization = block.to_css_string();
+
+            assert_eq!(
+                serialization,
+                "background: rgb(255, 0, 0) url(\"http://servo/test.png\") repeat-x \
+                scroll left 7px bottom 4px / 70px 50px border-box padding-box;"
+            );
+        }
+
+        #[test]
+        fn background_should_combine_origin_and_clip_properties_when_equal() {
+            let block_text = "\
+                background-color: rgb(255, 0, 0); \
+                background-image: url(\"http://servo/test.png\"); \
+                background-repeat: repeat-x; \
+                background-attachment: scroll; \
+                background-size: 70px 50px; \
+                background-position-x: 7px; \
+                background-position-y: 4px; \
+                background-origin: padding-box; \
+                background-clip: padding-box;";
+
+            let block = parse(|c, i| Ok(parse_property_declaration_list(c, i)), block_text).unwrap();
+
+            let serialization = block.to_css_string();
+
+            assert_eq!(
+                serialization,
+                "background: rgb(255, 0, 0) url(\"http://servo/test.png\") repeat-x \
+                scroll 7px 4px / 70px 50px padding-box;"
+            );
+        }
+
+        #[test]
+        fn serialize_multiple_backgrounds() {
+            let block_text = "\
+                background-color: rgb(0, 0, 255); \
+                background-image: url(\"http://servo/test.png\"), none; \
+                background-repeat: repeat-x, repeat-y; \
+                background-attachment: scroll, scroll; \
+                background-size: 70px 50px, 20px 30px; \
+                background-position-x: 7px, 70px; \
+                background-position-y: 4px, 40px; \
+                background-origin: border-box, padding-box; \
+                background-clip: padding-box, padding-box;";
+
+            let block = parse(|c, i| Ok(parse_property_declaration_list(c, i)), block_text).unwrap();
+
+            let serialization = block.to_css_string();
+
+            assert_eq!(
+                serialization, "background: \
+                url(\"http://servo/test.png\") repeat-x scroll 7px 4px / 70px 50px border-box padding-box, \
+                rgb(0, 0, 255) none repeat-y scroll 70px 40px / 20px 30px padding-box;"
+            );
+        }
+
+        #[test]
+        fn serialize_multiple_backgrounds_unequal_property_lists() {
+            // When the lengths of property values are different, the shorthand serialization
+            // should not be used. Previously the implementation cycled values if the lists were
+            // uneven. This is incorrect, in that we should serialize to a shorthand only when the
+            // lists have the same length (this affects background, transition and animation).
+            // https://github.com/servo/servo/issues/15398 )
+            // With background, the color is one exception as it should only appear once for
+            // multiple backgrounds.
+            // Below background-origin only has one value.
+            let block_text = "\
+                background-color: rgb(0, 0, 255); \
+                background-image: url(\"http://servo/test.png\"), none; \
+                background-repeat: repeat-x, repeat-y; \
+                background-attachment: scroll, scroll; \
+                background-size: 70px 50px, 20px 30px; \
+                background-position: 7px 4px, 5px 6px; \
+                background-origin: border-box; \
+                background-clip: padding-box, padding-box;";
+
+            let block = parse(|c, i| Ok(parse_property_declaration_list(c, i)), block_text).unwrap();
+
+            let serialization = block.to_css_string();
+
+            assert_eq!(serialization, block_text);
+        }
+
+        #[test]
+        fn background_position_should_be_a_valid_form_its_longhands() {
+            // If there is any longhand consisted of both keyword and position,
+            // the shorthand result should be the 4-value format.
+            let block_text = "\
+                background-position-x: 30px;\
+                background-position-y: bottom 20px;";
+            let block = parse(|c, i| Ok(parse_property_declaration_list(c, i)), block_text).unwrap();
+            let serialization = block.to_css_string();
+            assert_eq!(serialization, "background-position: left 30px bottom 20px;");
+
+            // If there is no longhand consisted of both keyword and position,
+            // the shorthand result should be the 2-value format.
+            let block_text = "\
+                background-position-x: center;\
+                background-position-y: 20px;";
+            let block = parse(|c, i| Ok(parse_property_declaration_list(c, i)), block_text).unwrap();
+            let serialization = block.to_css_string();
+            assert_eq!(serialization, "background-position: center 20px;");
+        }
+    }
+
+    mod quotes {
+        pub use super::*;
+
+        #[test]
+        fn should_serialize_none_correctly() {
+            use style::properties::longhands::quotes;
+
+            assert_roundtrip_with_context!(quotes::parse, "none");
+        }
+    }
+
+    mod animation {
+        pub use super::*;
+
+        #[test]
+        fn serialize_single_animation() {
+            let block_text = "\
+                animation-name: bounce;\
+                animation-duration: 1s;\
+                animation-timing-function: ease-in;\
+                animation-delay: 0s;\
+                animation-direction: normal;\
+                animation-fill-mode: forwards;\
+                animation-iteration-count: infinite;\
+                animation-play-state: paused;";
+
+            let block = parse(|c, i| Ok(parse_property_declaration_list(c, i)), block_text).unwrap();
+
+            let serialization = block.to_css_string();
+
+            assert_eq!(serialization, "animation: 1s ease-in 0s infinite normal forwards paused bounce;")
+        }
+
+        #[test]
+        fn serialize_multiple_animations() {
+            let block_text = "\
+                animation-name: bounce, roll;\
+                animation-duration: 1s, 0.2s;\
+                animation-timing-function: ease-in, linear;\
+                animation-delay: 0s, 1s;\
+                animation-direction: normal, reverse;\
+                animation-fill-mode: forwards, backwards;\
+                animation-iteration-count: infinite, 2;\
+                animation-play-state: paused, running;";
+
+            let block = parse(|c, i| Ok(parse_property_declaration_list(c, i)), block_text).unwrap();
+
+            let serialization = block.to_css_string();
+
+            assert_eq!(serialization,
+                       "animation: 1s ease-in 0s infinite normal forwards paused bounce, \
+                                   0.2s linear 1s 2 reverse backwards running roll;");
+        }
+
+        #[test]
+        fn serialize_multiple_animations_unequal_property_lists() {
+            // When the lengths of property values are different, the shorthand serialization
+            // should not be used. Previously the implementation cycled values if the lists were
+            // uneven. This is incorrect, in that we should serialize to a shorthand only when the
+            // lists have the same length (this affects background, transition and animation).
+            // https://github.com/servo/servo/issues/15398 )
+            let block_text = "\
+                animation-name: bounce, roll, flip, jump; \
+                animation-duration: 1s, 0.2s; \
+                animation-timing-function: ease-in, linear; \
+                animation-delay: 0s, 1s, 0.5s; \
+                animation-direction: normal; \
+                animation-fill-mode: forwards, backwards; \
+                animation-iteration-count: infinite, 2; \
+                animation-play-state: paused, running;";
+
+            let block = parse(|c, i| Ok(parse_property_declaration_list(c, i)), block_text).unwrap();
+
+            let serialization = block.to_css_string();
+
+            assert_eq!(serialization, block_text);
+        }
+
+        #[test]
+        fn serialize_multiple_without_all_properties_returns_longhand() {
+            // timing function and direction are missing, so no shorthand is returned.
+            let block_text = "animation-name: bounce, roll; \
+                              animation-duration: 1s, 0.2s; \
+                              animation-delay: 0s, 1s; \
+                              animation-fill-mode: forwards, backwards; \
+                              animation-iteration-count: infinite, 2; \
+                              animation-play-state: paused, running;";
+
+            let block = parse(|c, i| Ok(parse_property_declaration_list(c, i)), block_text).unwrap();
+
+            let serialization = block.to_css_string();
+
+            assert_eq!(serialization, block_text);
+        }
+    }
+
+    mod keywords {
+        pub use super::*;
+        #[test]
+        fn css_wide_keywords_should_be_parsed() {
+            let block_text = "--a:inherit;";
+            let block = parse(|c, i| Ok(parse_property_declaration_list(c, i)), block_text).unwrap();
+
+            let serialization = block.to_css_string();
+            assert_eq!(serialization, "--a: inherit;");
+        }
+
+        #[test]
+        fn non_keyword_custom_property_should_be_unparsed() {
+            let block_text = "--main-color: #06c;";
+            let block = parse(|c, i| Ok(parse_property_declaration_list(c, i)), block_text).unwrap();
+
+            let serialization = block.to_css_string();
+            assert_eq!(serialization, block_text);
+        }
+    }
+
+    mod effects {
+        pub use super::*;
+        pub use style::properties::longhands::box_shadow::SpecifiedValue as BoxShadowList;
+        pub use style::values::specified::effects::{BoxShadow, SimpleShadow};
+
+        #[test]
+        fn box_shadow_should_serialize_correctly() {
+            use style::values::specified::length::NonNegativeLength;
+
+            let mut properties = Vec::new();
+            let shadow_val = BoxShadow {
+                base: SimpleShadow {
+                    color: None,
+                    horizontal: Length::from_px(1f32),
+                    vertical: Length::from_px(2f32),
+                    blur: Some(NonNegativeLength::from_px(3f32)),
+                },
+                spread: Some(Length::from_px(4f32)),
+                inset: false,
+            };
+            let shadow_decl = BoxShadowList(vec![shadow_val]);
+            properties.push(PropertyDeclaration::BoxShadow(shadow_decl));
+            let shadow_css = "box-shadow: 1px 2px 3px 4px;";
+            let shadow = parse(|c, i| Ok(parse_property_declaration_list(c, i)), shadow_css).unwrap();
+
+            assert_eq!(shadow.to_css_string(), shadow_css);
+        }
+    }
+}
diff --git a/servo/tests/unit/style/rule_tree/bench.rs b/servo/tests/unit/style/rule_tree/bench.rs
new file mode 100644
index 0000000000..d7b024a1b4
--- /dev/null
+++ b/servo/tests/unit/style/rule_tree/bench.rs
@@ -0,0 +1,214 @@
+/* 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/. */
+
+use cssparser::SourceLocation;
+use rayon;
+use servo_arc::Arc;
+use servo_url::ServoUrl;
+use style::context::QuirksMode;
+use style::error_reporting::{ParseErrorReporter, ContextualParseError};
+use style::media_queries::MediaList;
+use style::properties::{longhands, Importance, PropertyDeclaration, PropertyDeclarationBlock};
+use style::rule_tree::{CascadeLevel, RuleTree, StrongRuleNode, StyleSource};
+use style::shared_lock::SharedRwLock;
+use style::stylesheets::{Origin, Stylesheet, CssRule};
+use style::thread_state::{self, ThreadState};
+use test::{self, Bencher};
+
+struct ErrorringErrorReporter;
+impl ParseErrorReporter for ErrorringErrorReporter {
+    fn report_error(&self,
+                    url: &ServoUrl,
+                    location: SourceLocation,
+                    error: ContextualParseError) {
+        panic!("CSS error: {}\t\n{}:{} {}", url.as_str(), location.line, location.column, error);
+    }
+}
+
+struct AutoGCRuleTree<'a>(&'a RuleTree);
+
+impl<'a> AutoGCRuleTree<'a> {
+    fn new(r: &'a RuleTree) -> Self {
+        AutoGCRuleTree(r)
+    }
+}
+
+impl<'a> Drop for AutoGCRuleTree<'a> {
+    fn drop(&mut self) {
+        unsafe {
+            self.0.gc();
+            assert!(::std::thread::panicking() ||
+                    !self.0.root().has_children_for_testing(),
+                    "No rule nodes other than the root shall remain!");
+        }
+    }
+}
+
+fn parse_rules(css: &str) -> Vec<(StyleSource, CascadeLevel)> {
+    let lock = SharedRwLock::new();
+    let media = Arc::new(lock.wrap(MediaList::empty()));
+
+    let s = Stylesheet::from_str(css,
+                                 ServoUrl::parse("http://localhost").unwrap(),
+                                 Origin::Author,
+                                 media,
+                                 lock,
+                                 None,
+                                 Some(&ErrorringErrorReporter),
+                                 QuirksMode::NoQuirks,
+                                 0);
+    let guard = s.shared_lock.read();
+    let rules = s.contents.rules.read_with(&guard);
+    rules.0.iter().filter_map(|rule| {
+        match *rule {
+            CssRule::Style(ref style_rule) => Some((
+                StyleSource::from_rule(style_rule.clone()),
+                CascadeLevel::UserNormal,
+            )),
+            _ => None,
+        }
+    }).collect()
+}
+
+fn test_insertion(rule_tree: &RuleTree, rules: Vec<(StyleSource, CascadeLevel)>) -> StrongRuleNode {
+    rule_tree.insert_ordered_rules(rules.into_iter())
+}
+
+fn test_insertion_style_attribute(rule_tree: &RuleTree, rules: &[(StyleSource, CascadeLevel)],
+                                  shared_lock: &SharedRwLock)
+                                  -> StrongRuleNode {
+    let mut rules = rules.to_vec();
+    rules.push((StyleSource::from_declarations(Arc::new(shared_lock.wrap(PropertyDeclarationBlock::with_one(
+        PropertyDeclaration::Display(
+            longhands::display::SpecifiedValue::Block),
+        Importance::Normal
+    )))), CascadeLevel::UserNormal));
+    test_insertion(rule_tree, rules)
+}
+
+#[bench]
+fn bench_insertion_basic(b: &mut Bencher) {
+    let r = RuleTree::new();
+    thread_state::initialize(ThreadState::SCRIPT);
+
+    let rules_matched = parse_rules(
+        ".foo { width: 200px; } \
+         .bar { height: 500px; } \
+         .baz { display: block; }");
+
+    b.iter(|| {
+        let _gc = AutoGCRuleTree::new(&r);
+
+        for _ in 0..(4000 + 400) {
+            test::black_box(test_insertion(&r, rules_matched.clone()));
+        }
+    })
+}
+
+#[bench]
+fn bench_insertion_basic_per_element(b: &mut Bencher) {
+    let r = RuleTree::new();
+    thread_state::initialize(ThreadState::SCRIPT);
+
+    let rules_matched = parse_rules(
+        ".foo { width: 200px; } \
+         .bar { height: 500px; } \
+         .baz { display: block; }");
+
+    b.iter(|| {
+        let _gc = AutoGCRuleTree::new(&r);
+
+        test::black_box(test_insertion(&r, rules_matched.clone()));
+    });
+}
+
+#[bench]
+fn bench_expensive_insertion(b: &mut Bencher) {
+    let r = RuleTree::new();
+    thread_state::initialize(ThreadState::SCRIPT);
+
+    // This test case tests a case where you style a bunch of siblings
+    // matching the same rules, with a different style attribute each
+    // one.
+    let rules_matched = parse_rules(
+        ".foo { width: 200px; } \
+         .bar { height: 500px; } \
+         .baz { display: block; }");
+
+    let shared_lock = SharedRwLock::new();
+    b.iter(|| {
+        let _gc = AutoGCRuleTree::new(&r);
+
+        for _ in 0..(4000 + 400) {
+            test::black_box(test_insertion_style_attribute(&r, &rules_matched, &shared_lock));
+        }
+    });
+}
+
+#[bench]
+fn bench_insertion_basic_parallel(b: &mut Bencher) {
+    let r = RuleTree::new();
+    thread_state::initialize(ThreadState::SCRIPT);
+
+    let rules_matched = parse_rules(
+        ".foo { width: 200px; } \
+         .bar { height: 500px; } \
+         .baz { display: block; }");
+
+    b.iter(|| {
+        let _gc = AutoGCRuleTree::new(&r);
+
+        rayon::scope(|s| {
+            for _ in 0..4 {
+                s.spawn(|s| {
+                    for _ in 0..1000 {
+                        test::black_box(test_insertion(&r,
+                                                       rules_matched.clone()));
+                    }
+                    s.spawn(|_| {
+                        for _ in 0..100 {
+                            test::black_box(test_insertion(&r,
+                                                           rules_matched.clone()));
+                        }
+                    })
+                })
+            }
+        });
+    });
+}
+
+#[bench]
+fn bench_expensive_insertion_parallel(b: &mut Bencher) {
+    let r = RuleTree::new();
+    thread_state::initialize(ThreadState::SCRIPT);
+
+    let rules_matched = parse_rules(
+        ".foo { width: 200px; } \
+         .bar { height: 500px; } \
+         .baz { display: block; }");
+
+    let shared_lock = SharedRwLock::new();
+    b.iter(|| {
+        let _gc = AutoGCRuleTree::new(&r);
+
+        rayon::scope(|s| {
+            for _ in 0..4 {
+                s.spawn(|s| {
+                    for _ in 0..1000 {
+                        test::black_box(test_insertion_style_attribute(&r,
+                                                                       &rules_matched,
+                                                                       &shared_lock));
+                    }
+                    s.spawn(|_| {
+                        for _ in 0..100 {
+                            test::black_box(test_insertion_style_attribute(&r,
+                                                                           &rules_matched,
+                                                                           &shared_lock));
+                        }
+                    })
+                })
+            }
+        });
+    });
+}
diff --git a/servo/tests/unit/style/rule_tree/mod.rs b/servo/tests/unit/style/rule_tree/mod.rs
new file mode 100644
index 0000000000..6370d2640c
--- /dev/null
+++ b/servo/tests/unit/style/rule_tree/mod.rs
@@ -0,0 +1,5 @@
+/* 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/. */
+
+mod bench;
diff --git a/servo/tests/unit/style/size_of.rs b/servo/tests/unit/style/size_of.rs
new file mode 100644
index 0000000000..744d3596ac
--- /dev/null
+++ b/servo/tests/unit/style/size_of.rs
@@ -0,0 +1,23 @@
+/* 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/. */
+
+use selectors::parser::{SelectorParseError, SelectorParseErrorKind};
+use style::invalidation::element::invalidation_map::Dependency;
+use style::properties;
+
+size_of_test!(test_size_of_dependency, Dependency, 16);
+
+size_of_test!(test_size_of_property_declaration, properties::PropertyDeclaration, 32);
+
+// This is huge, but we allocate it on the stack and then never move it,
+// we only pass `&mut SourcePropertyDeclaration` references around.
+size_of_test!(test_size_of_parsed_declaration, properties::SourcePropertyDeclaration, 568);
+
+size_of_test!(test_size_of_selector_parse_error_kind, SelectorParseErrorKind, 40);
+size_of_test!(test_size_of_style_parse_error_kind, ::style_traits::StyleParseErrorKind, 56);
+size_of_test!(test_size_of_value_parse_error_kind, ::style_traits::ValueParseErrorKind, 40);
+
+size_of_test!(test_size_of_selector_parse_error, SelectorParseError, 56);
+size_of_test!(test_size_of_style_traits_parse_error, ::style_traits::ParseError, 72);
+size_of_test!(test_size_of_value_parse_error, ::style_traits::ValueParseError, 56);
diff --git a/servo/tests/unit/style/str.rs b/servo/tests/unit/style/str.rs
new file mode 100644
index 0000000000..149b3f231f
--- /dev/null
+++ b/servo/tests/unit/style/str.rs
@@ -0,0 +1,46 @@
+/* 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/. */
+
+use style::str::{split_html_space_chars, str_join, starts_with_ignore_ascii_case};
+
+#[test]
+pub fn split_html_space_chars_whitespace() {
+    assert!(split_html_space_chars("").collect::<Vec<_>>().is_empty());
+    assert!(split_html_space_chars("\u{0020}\u{0009}\u{000a}\u{000c}\u{000d}").collect::<Vec<_>>().is_empty());
+}
+
+#[test]
+pub fn test_str_join_empty() {
+    let slice: [&str; 0] = [];
+    let actual = str_join(&slice, "-");
+    let expected = "";
+    assert_eq!(actual, expected);
+}
+
+#[test]
+pub fn test_str_join_one() {
+    let slice = ["alpha"];
+    let actual = str_join(&slice, "-");
+    let expected = "alpha";
+    assert_eq!(actual, expected);
+}
+
+#[test]
+pub fn test_str_join_many() {
+    let slice = ["", "alpha", "", "beta", "gamma", ""];
+    let actual = str_join(&slice, "-");
+    let expected = "-alpha--beta-gamma-";
+    assert_eq!(actual, expected);
+}
+
+#[test]
+pub fn test_starts_with_ignore_ascii_case_basic() {
+    assert!(starts_with_ignore_ascii_case("-webkit-", "-webkit-"));
+    assert!(starts_with_ignore_ascii_case("-webkit-foo", "-webkit-"));
+}
+
+#[test]
+pub fn test_starts_with_ignore_ascii_case_char_boundary() {
+    assert!(!starts_with_ignore_ascii_case("aaaaa💩", "-webkit-"));
+}
diff --git a/servo/tests/unit/style/stylesheets.rs b/servo/tests/unit/style/stylesheets.rs
new file mode 100644
index 0000000000..e612a39d11
--- /dev/null
+++ b/servo/tests/unit/style/stylesheets.rs
@@ -0,0 +1,431 @@
+/* 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/. */
+
+use cssparser::{self, SourceLocation};
+use html5ever::{Namespace as NsAtom};
+use parking_lot::RwLock;
+use selectors::attr::*;
+use selectors::parser::*;
+use servo_arc::Arc;
+use servo_atoms::Atom;
+use servo_config::prefs::{PREFS, PrefValue};
+use servo_url::ServoUrl;
+use std::borrow::ToOwned;
+use std::cell::RefCell;
+use std::sync::atomic::AtomicBool;
+use style::context::QuirksMode;
+use style::error_reporting::{ParseErrorReporter, ContextualParseError};
+use style::media_queries::MediaList;
+use style::properties::{CSSWideKeyword, CustomDeclaration};
+use style::properties::{CustomDeclarationValue, Importance};
+use style::properties::{PropertyDeclaration, PropertyDeclarationBlock};
+use style::properties::longhands::{self, animation_timing_function};
+use style::shared_lock::SharedRwLock;
+use style::stylesheets::{Origin, Namespaces};
+use style::stylesheets::{Stylesheet, StylesheetContents, NamespaceRule, CssRule, CssRules, StyleRule, KeyframesRule};
+use style::stylesheets::keyframes_rule::{Keyframe, KeyframeSelector, KeyframePercentage};
+use style::values::{KeyframesName, CustomIdent};
+use style::values::computed::Percentage;
+use style::values::specified::{LengthPercentageOrAuto, PositionComponent};
+use style::values::specified::TimingFunction;
+
+pub fn block_from<I>(iterable: I) -> PropertyDeclarationBlock
+where I: IntoIterator<Item=(PropertyDeclaration, Importance)> {
+    let mut block = PropertyDeclarationBlock::new();
+    for (d, i) in iterable {
+        block.push(d, i);
+    }
+    block
+}
+
+#[test]
+fn test_parse_stylesheet() {
+    let css = r"
+        @namespace url(http://www.w3.org/1999/xhtml);
+        /* FIXME: only if scripting is enabled */
+        input[type=hidden i] {
+            display: block !important;
+            display: none !important;
+            display: inline;
+            --a: b !important;
+            --a: inherit !important;
+            --a: c;
+        }
+        html , body /**/ {
+            display: none;
+            display: block;
+        }
+        #d1 > .ok { background: blue; }
+        @keyframes foo {
+            from { width: 0% }
+            to {
+                width: 100%;
+                width: 50% !important; /* !important not allowed here */
+                animation-name: 'foo'; /* animation properties not allowed here */
+                animation-timing-function: ease; /* … except animation-timing-function */
+            }
+        }";
+    let url = ServoUrl::parse("about::test").unwrap();
+    let lock = SharedRwLock::new();
+    let media = Arc::new(lock.wrap(MediaList::empty()));
+    let stylesheet = Stylesheet::from_str(css, url.clone(), Origin::UserAgent, media, lock,
+                                          None, None, QuirksMode::NoQuirks, 0);
+    let mut namespaces = Namespaces::default();
+    namespaces.default = Some(ns!(html));
+    let expected = Stylesheet {
+        contents: StylesheetContents {
+            origin: Origin::UserAgent,
+            namespaces: RwLock::new(namespaces),
+            url_data: RwLock::new(url),
+            quirks_mode: QuirksMode::NoQuirks,
+            rules: CssRules::new(vec![
+                CssRule::Namespace(Arc::new(stylesheet.shared_lock.wrap(NamespaceRule {
+                    prefix: None,
+                    url: NsAtom::from("http://www.w3.org/1999/xhtml"),
+                    source_location: SourceLocation {
+                        line: 1,
+                        column: 19,
+                    },
+                }))),
+                CssRule::Style(Arc::new(stylesheet.shared_lock.wrap(StyleRule {
+                    selectors: SelectorList::from_vec(vec!(
+                        Selector::from_vec(vec!(
+                            Component::DefaultNamespace(NsAtom::from("http://www.w3.org/1999/xhtml")),
+                            Component::LocalName(LocalName {
+                                name: local_name!("input"),
+                                lower_name: local_name!("input"),
+                            }),
+                            Component::AttributeInNoNamespace {
+                                local_name: local_name!("type"),
+                                operator: AttrSelectorOperator::Equal,
+                                value: "hidden".to_owned(),
+                                case_sensitivity: ParsedCaseSensitivity::AsciiCaseInsensitive,
+                                never_matches: false,
+                            }
+                        ), (0 << 20) + (1 << 10) + (1 << 0))
+                    )),
+                    block: Arc::new(stylesheet.shared_lock.wrap(block_from(vec![
+                        (
+                            PropertyDeclaration::Display(longhands::display::SpecifiedValue::None),
+                            Importance::Important,
+                        ),
+                        (
+                            PropertyDeclaration::Custom(CustomDeclaration {
+                                name: Atom::from("a"),
+                                value: CustomDeclarationValue::CSSWideKeyword(CSSWideKeyword::Inherit),
+                            }),
+                            Importance::Important,
+                        ),
+                    ]))),
+                    source_location: SourceLocation {
+                        line: 3,
+                        column: 9,
+                    },
+                }))),
+                CssRule::Style(Arc::new(stylesheet.shared_lock.wrap(StyleRule {
+                    selectors: SelectorList::from_vec(vec!(
+                        Selector::from_vec(vec!(
+                                Component::DefaultNamespace(NsAtom::from("http://www.w3.org/1999/xhtml")),
+                                Component::LocalName(LocalName {
+                                    name: local_name!("html"),
+                                    lower_name: local_name!("html"),
+                                }),
+                            ), (0 << 20) + (0 << 10) + (1 << 0)),
+                        Selector::from_vec(vec!(
+                            Component::DefaultNamespace(NsAtom::from("http://www.w3.org/1999/xhtml")),
+                            Component::LocalName(LocalName {
+                                name: local_name!("body"),
+                                lower_name: local_name!("body"),
+                            })
+                            ), (0 << 20) + (0 << 10) + (1 << 0)
+                        ),
+                    )),
+                    block: Arc::new(stylesheet.shared_lock.wrap(block_from(vec![
+                        (PropertyDeclaration::Display(longhands::display::SpecifiedValue::Block),
+                         Importance::Normal),
+                    ]))),
+                    source_location: SourceLocation {
+                        line: 11,
+                        column: 9,
+                    },
+                }))),
+                CssRule::Style(Arc::new(stylesheet.shared_lock.wrap(StyleRule {
+                    selectors: SelectorList::from_vec(vec!(
+                        Selector::from_vec(vec!(
+                            Component::DefaultNamespace(NsAtom::from("http://www.w3.org/1999/xhtml")),
+                            Component::ID(Atom::from("d1")),
+                            Component::Combinator(Combinator::Child),
+                            Component::DefaultNamespace(NsAtom::from("http://www.w3.org/1999/xhtml")),
+                            Component::Class(Atom::from("ok"))
+                        ), (1 << 20) + (1 << 10) + (0 << 0))
+                    )),
+                    block: Arc::new(stylesheet.shared_lock.wrap(block_from(vec![
+                        (PropertyDeclaration::BackgroundColor(
+                            longhands::background_color::SpecifiedValue::Numeric {
+                                authored: Some("blue".to_owned().into_boxed_str()),
+                                parsed: cssparser::RGBA::new(0, 0, 255, 255),
+                            }
+                         ),
+                         Importance::Normal),
+                        (PropertyDeclaration::BackgroundPositionX(
+                            longhands::background_position_x::SpecifiedValue(
+                            vec![PositionComponent::zero()])),
+                         Importance::Normal),
+                        (PropertyDeclaration::BackgroundPositionY(
+                            longhands::background_position_y::SpecifiedValue(
+                            vec![PositionComponent::zero()])),
+                         Importance::Normal),
+                        (PropertyDeclaration::BackgroundRepeat(
+                            longhands::background_repeat::SpecifiedValue(
+                            vec![longhands::background_repeat::single_value
+                                                       ::get_initial_specified_value()])),
+                         Importance::Normal),
+                        (PropertyDeclaration::BackgroundAttachment(
+                            longhands::background_attachment::SpecifiedValue(
+                            vec![longhands::background_attachment::single_value
+                                                       ::get_initial_specified_value()])),
+                         Importance::Normal),
+                        (PropertyDeclaration::BackgroundImage(
+                            longhands::background_image::SpecifiedValue(
+                            vec![longhands::background_image::single_value
+                                                       ::get_initial_specified_value()])),
+                         Importance::Normal),
+                        (PropertyDeclaration::BackgroundSize(
+                            longhands::background_size::SpecifiedValue(
+                            vec![longhands::background_size::single_value
+                                                       ::get_initial_specified_value()])),
+                         Importance::Normal),
+                        (PropertyDeclaration::BackgroundOrigin(
+                            longhands::background_origin::SpecifiedValue(
+                            vec![longhands::background_origin::single_value
+                                                       ::get_initial_specified_value()])),
+                         Importance::Normal),
+                        (PropertyDeclaration::BackgroundClip(
+                            longhands::background_clip::SpecifiedValue(
+                            vec![longhands::background_clip::single_value
+                                                       ::get_initial_specified_value()])),
+                         Importance::Normal),
+                    ]))),
+                    source_location: SourceLocation {
+                        line: 15,
+                        column: 9,
+                    },
+                }))),
+                CssRule::Keyframes(Arc::new(stylesheet.shared_lock.wrap(KeyframesRule {
+                    name: KeyframesName::Ident(CustomIdent("foo".into())),
+                    keyframes: vec![
+                        Arc::new(stylesheet.shared_lock.wrap(Keyframe {
+                            selector: KeyframeSelector::new_for_unit_testing(
+                                          vec![KeyframePercentage::new(0.)]),
+                            block: Arc::new(stylesheet.shared_lock.wrap(block_from(vec![
+                                (PropertyDeclaration::Width(
+                                    LengthPercentageOrAuto::Percentage(Percentage(0.))),
+                                 Importance::Normal),
+                            ]))),
+                            source_location: SourceLocation {
+                                line: 17,
+                                column: 13,
+                            },
+                        })),
+                        Arc::new(stylesheet.shared_lock.wrap(Keyframe {
+                            selector: KeyframeSelector::new_for_unit_testing(
+                                          vec![KeyframePercentage::new(1.)]),
+                            block: Arc::new(stylesheet.shared_lock.wrap(block_from(vec![
+                                (PropertyDeclaration::Width(
+                                    LengthPercentageOrAuto::Percentage(Percentage(1.))),
+                                 Importance::Normal),
+                                (PropertyDeclaration::AnimationTimingFunction(
+                                    animation_timing_function::SpecifiedValue(
+                                        vec![TimingFunction::ease()])),
+                                 Importance::Normal),
+                            ]))),
+                            source_location: SourceLocation {
+                                line: 18,
+                                column: 13,
+                            },
+                        })),
+                    ],
+                    vendor_prefix: None,
+                    source_location: SourceLocation {
+                        line: 16,
+                        column: 19,
+                    },
+                })))
+            ], &stylesheet.shared_lock),
+            source_map_url: RwLock::new(None),
+            source_url: RwLock::new(None),
+        },
+        media: Arc::new(stylesheet.shared_lock.wrap(MediaList::empty())),
+        shared_lock: stylesheet.shared_lock.clone(),
+        disabled: AtomicBool::new(false),
+    };
+
+    assert_eq!(format!("{:#?}", stylesheet), format!("{:#?}", expected));
+}
+
+#[derive(Debug)]
+struct CSSError {
+    pub url : ServoUrl,
+    pub line: u32,
+    pub column: u32,
+    pub message: String
+}
+
+struct TestingErrorReporter {
+    errors: RefCell<Vec<CSSError>>,
+}
+
+impl TestingErrorReporter {
+    pub fn new() -> Self {
+        TestingErrorReporter {
+            errors: RefCell::new(Vec::new()),
+        }
+    }
+
+    fn assert_messages_contain(&self, expected_errors: &[(u32, u32, &str)]) {
+        let errors = self.errors.borrow();
+        for (i, (error, &(line, column, message))) in errors.iter().zip(expected_errors).enumerate() {
+            assert_eq!((error.line, error.column), (line, column),
+                       "line/column numbers of the {}th error: {:?}", i + 1, error.message);
+            assert!(error.message.contains(message),
+                    "{:?} does not contain {:?}", error.message, message);
+        }
+        if errors.len() < expected_errors.len() {
+            panic!("Missing errors: {:#?}", &expected_errors[errors.len()..]);
+        }
+        if errors.len() > expected_errors.len() {
+            panic!("Extra errors: {:#?}", &errors[expected_errors.len()..]);
+        }
+    }
+}
+
+impl ParseErrorReporter for TestingErrorReporter {
+    fn report_error(&self,
+                    url: &ServoUrl,
+                    location: SourceLocation,
+                    error: ContextualParseError) {
+        self.errors.borrow_mut().push(
+            CSSError{
+                url: url.clone(),
+                line: location.line,
+                column: location.column,
+                message: error.to_string(),
+            }
+        )
+    }
+}
+
+
+#[test]
+fn test_report_error_stylesheet() {
+    PREFS.set("layout.viewport.enabled", PrefValue::Boolean(true));
+    let css = r"
+    div {
+        background-color: red;
+        display: invalid;
+        background-image: linear-gradient(0deg, black, invalid, transparent);
+        invalid: true;
+    }
+    @media (min-width: 10px invalid 1000px) {}
+    @font-face { src: url(), invalid, url(); }
+    @counter-style foo { symbols: a 0invalid b }
+    @font-feature-values Sans Sans { @foo {} @swash { foo: 1 invalid 2 } }
+    @invalid;
+    @media screen { @invalid; }
+    @supports (color: green) and invalid and (margin: 0) {}
+    @keyframes foo { from invalid {} to { margin: 0 invalid 0; } }
+    @viewport { width: 320px invalid auto; }
+    ";
+    let url = ServoUrl::parse("about::test").unwrap();
+    let error_reporter = TestingErrorReporter::new();
+
+    let lock = SharedRwLock::new();
+    let media = Arc::new(lock.wrap(MediaList::empty()));
+    Stylesheet::from_str(css, url.clone(), Origin::UserAgent, media, lock,
+                         None, Some(&error_reporter), QuirksMode::NoQuirks, 5);
+
+    error_reporter.assert_messages_contain(&[
+        (8, 18, "Unsupported property declaration: 'display: invalid;'"),
+        (9, 27, "Unsupported property declaration: 'background-image:"),  // FIXME: column should be around 56
+        (10, 17, "Unsupported property declaration: 'invalid: true;'"),
+        (12, 28, "Invalid media rule"),
+        (13, 30, "Unsupported @font-face descriptor declaration"),
+
+        // When @counter-style is supported, this should be replaced with two errors
+        (14, 19, "Invalid rule: '@counter-style "),
+
+        // When @font-feature-values is supported, this should be replaced with two errors
+        (15, 25, "Invalid rule: '@font-feature-values "),
+
+        (16, 13, "Invalid rule: '@invalid'"),
+        (17, 29, "Invalid rule: '@invalid'"),
+
+        (18, 34, "Invalid rule: '@supports "),
+        (19, 26, "Invalid keyframe rule: 'from invalid '"),
+        (19, 52, "Unsupported keyframe property declaration: 'margin: 0 invalid 0;'"),
+        (20, 29, "Unsupported @viewport descriptor declaration: 'width: 320px invalid auto;'"),
+    ]);
+
+    assert_eq!(error_reporter.errors.borrow()[0].url, url);
+}
+
+#[test]
+fn test_no_report_unrecognized_vendor_properties() {
+    let css = r"
+    div {
+        -o-background-color: red;
+        _background-color: red;
+        -moz-background-color: red;
+    }
+    ";
+    let url = ServoUrl::parse("about::test").unwrap();
+    let error_reporter = TestingErrorReporter::new();
+
+    let lock = SharedRwLock::new();
+    let media = Arc::new(lock.wrap(MediaList::empty()));
+    Stylesheet::from_str(css, url, Origin::UserAgent, media, lock,
+                         None, Some(&error_reporter), QuirksMode::NoQuirks, 0);
+
+    error_reporter.assert_messages_contain(&[
+        (4, 31, "Unsupported property declaration: '-moz-background-color: red;'"),
+    ]);
+}
+
+#[test]
+fn test_source_map_url() {
+    let tests = vec![
+        ("", None),
+        ("/*# sourceMappingURL=something */", Some("something".to_string())),
+    ];
+
+    for test in tests {
+        let url = ServoUrl::parse("about::test").unwrap();
+        let lock = SharedRwLock::new();
+        let media = Arc::new(lock.wrap(MediaList::empty()));
+        let stylesheet = Stylesheet::from_str(test.0, url.clone(), Origin::UserAgent, media, lock,
+                                              None, None, QuirksMode::NoQuirks,
+                                              0);
+        let url_opt = stylesheet.contents.source_map_url.read();
+        assert_eq!(*url_opt, test.1);
+    }
+}
+
+#[test]
+fn test_source_url() {
+    let tests = vec![
+        ("", None),
+        ("/*# sourceURL=something */", Some("something".to_string())),
+    ];
+
+    for test in tests {
+        let url = ServoUrl::parse("about::test").unwrap();
+        let lock = SharedRwLock::new();
+        let media = Arc::new(lock.wrap(MediaList::empty()));
+        let stylesheet = Stylesheet::from_str(test.0, url.clone(), Origin::UserAgent, media, lock,
+                                              None, None, QuirksMode::NoQuirks,
+                                              0);
+        let url_opt = stylesheet.contents.source_url.read();
+        assert_eq!(*url_opt, test.1);
+    }
+}
diff --git a/servo/tests/unit/style/stylist.rs b/servo/tests/unit/style/stylist.rs
new file mode 100644
index 0000000000..5a4d3be244
--- /dev/null
+++ b/servo/tests/unit/style/stylist.rs
@@ -0,0 +1,201 @@
+/* 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/. */
+
+use cssparser::SourceLocation;
+use euclid::Scale;
+use euclid::Size2D;
+use selectors::parser::{AncestorHashes, Selector};
+use servo_arc::Arc;
+use servo_atoms::Atom;
+use style::context::QuirksMode;
+use style::media_queries::{Device, MediaType};
+use style::properties::{PropertyDeclarationBlock, PropertyDeclaration};
+use style::properties::{longhands, Importance};
+use style::selector_map::SelectorMap;
+use style::selector_parser::{SelectorImpl, SelectorParser};
+use style::shared_lock::SharedRwLock;
+use style::stylesheets::StyleRule;
+use style::stylist::{Stylist, Rule};
+use style::stylist::needs_revalidation_for_testing;
+use style::thread_state::{self, ThreadState};
+
+/// Helper method to get some Rules from selector strings.
+/// Each sublist of the result contains the Rules for one StyleRule.
+fn get_mock_rules(css_selectors: &[&str]) -> (Vec<Vec<Rule>>, SharedRwLock) {
+    let shared_lock = SharedRwLock::new();
+    (css_selectors.iter().enumerate().map(|(i, selectors)| {
+        let selectors = SelectorParser::parse_author_origin_no_namespace(selectors).unwrap();
+
+        let locked = Arc::new(shared_lock.wrap(StyleRule {
+            selectors: selectors,
+            block: Arc::new(shared_lock.wrap(PropertyDeclarationBlock::with_one(
+                PropertyDeclaration::Display(
+                    longhands::display::SpecifiedValue::Block),
+                Importance::Normal
+            ))),
+            source_location: SourceLocation {
+                line: 0,
+                column: 0,
+            },
+        }));
+
+        let guard = shared_lock.read();
+        let rule = locked.read_with(&guard);
+        rule.selectors.0.iter().map(|s| {
+            Rule::new(s.clone(), AncestorHashes::new(s, QuirksMode::NoQuirks), locked.clone(), i as u32)
+        }).collect()
+    }).collect(), shared_lock)
+}
+
+fn parse_selectors(selectors: &[&str]) -> Vec<Selector<SelectorImpl>> {
+    selectors.iter()
+             .map(|x| SelectorParser::parse_author_origin_no_namespace(x).unwrap().0
+                                                                         .into_iter()
+                                                                         .nth(0)
+                                                                         .unwrap())
+             .collect()
+}
+
+#[test]
+fn test_revalidation_selectors() {
+    let test = parse_selectors(&[
+        // Not revalidation selectors.
+        "div",
+        "div:not(.foo)",
+        "div span",
+        "div > span",
+
+        // ID selectors.
+        "#foo1",
+        "#foo2::before",
+        "#foo3 > span",
+        "#foo1 > span", // FIXME(bz): This one should not be a
+                        // revalidation selector, since #foo1 should be in the
+                        // rule hash.
+
+        // Attribute selectors.
+        "div[foo]",
+        "div:not([foo])",
+        "div[foo = \"bar\"]",
+        "div[foo ~= \"bar\"]",
+        "div[foo |= \"bar\"]",
+        "div[foo ^= \"bar\"]",
+        "div[foo $= \"bar\"]",
+        "div[foo *= \"bar\"]",
+        "*|div[foo][bar = \"baz\"]",
+
+        // Non-state-based pseudo-classes.
+        "div:empty",
+        "div:first-child",
+        "div:last-child",
+        "div:only-child",
+        "div:nth-child(2)",
+        "div:nth-last-child(2)",
+        "div:nth-of-type(2)",
+        "div:nth-last-of-type(2)",
+        "div:first-of-type",
+        "div:last-of-type",
+        "div:only-of-type",
+
+        // Note: it would be nice to test :moz-any and the various other non-TS
+        // pseudo classes supported by gecko, but we don't have access to those
+        // in these unit tests. :-(
+
+        // Sibling combinators.
+        "span + div",
+        "span ~ div",
+
+        // Selectors in the ancestor chain (needed for cousin sharing).
+        "p:first-child span",
+    ]).into_iter()
+      .filter(|s| needs_revalidation_for_testing(&s))
+      .collect::<Vec<_>>();
+
+    let reference = parse_selectors(&[
+        // ID selectors.
+        "#foo3 > span",
+        "#foo1 > span",
+
+        // Attribute selectors.
+        "div[foo]",
+        "div:not([foo])",
+        "div[foo = \"bar\"]",
+        "div[foo ~= \"bar\"]",
+        "div[foo |= \"bar\"]",
+        "div[foo ^= \"bar\"]",
+        "div[foo $= \"bar\"]",
+        "div[foo *= \"bar\"]",
+        "*|div[foo][bar = \"baz\"]",
+
+        // Non-state-based pseudo-classes.
+        "div:empty",
+        "div:first-child",
+        "div:last-child",
+        "div:only-child",
+        "div:nth-child(2)",
+        "div:nth-last-child(2)",
+        "div:nth-of-type(2)",
+        "div:nth-last-of-type(2)",
+        "div:first-of-type",
+        "div:last-of-type",
+        "div:only-of-type",
+
+        // Sibling combinators.
+        "span + div",
+        "span ~ div",
+
+        // Selectors in the ancestor chain (needed for cousin sharing).
+        "p:first-child span",
+    ]).into_iter()
+      .collect::<Vec<_>>();
+
+    assert_eq!(test.len(), reference.len());
+    for (t, r) in test.into_iter().zip(reference.into_iter()) {
+        assert_eq!(t, r)
+    }
+}
+
+#[test]
+fn test_rule_ordering_same_specificity() {
+    let (rules_list, _) = get_mock_rules(&["a.intro", "img.sidebar"]);
+    let a = &rules_list[0][0];
+    let b = &rules_list[1][0];
+    assert!((a.specificity(), a.source_order) < ((b.specificity(), b.source_order)),
+            "The rule that comes later should win.");
+}
+
+#[test]
+fn test_insert() {
+    let (rules_list, _) = get_mock_rules(&[".intro.foo", "#top"]);
+    let mut selector_map = SelectorMap::new();
+    selector_map.insert(rules_list[1][0].clone(), QuirksMode::NoQuirks)
+                .expect("OOM");
+    assert_eq!(1, selector_map.id_hash.get(&Atom::from("top"), QuirksMode::NoQuirks).unwrap()[0].source_order);
+    selector_map.insert(rules_list[0][0].clone(), QuirksMode::NoQuirks)
+                .expect("OOM");
+    assert_eq!(0, selector_map.class_hash.get(&Atom::from("foo"), QuirksMode::NoQuirks).unwrap()[0].source_order);
+    assert!(selector_map.class_hash.get(&Atom::from("intro"), QuirksMode::NoQuirks).is_none());
+}
+
+fn mock_stylist() -> Stylist {
+    let device = Device::new(MediaType::screen(), Size2D::new(0f32, 0f32), Scale::new(1.0));
+    Stylist::new(device, QuirksMode::NoQuirks)
+}
+
+#[test]
+fn test_stylist_device_accessors() {
+    thread_state::initialize(ThreadState::LAYOUT);
+    let stylist = mock_stylist();
+    assert_eq!(stylist.device().media_type(), MediaType::screen());
+    let mut stylist_mut = mock_stylist();
+    assert_eq!(stylist_mut.device_mut().media_type(), MediaType::screen());
+}
+
+#[test]
+fn test_stylist_rule_tree_accessors() {
+    thread_state::initialize(ThreadState::LAYOUT);
+    let stylist = mock_stylist();
+    stylist.rule_tree();
+    stylist.rule_tree().root();
+}
diff --git a/servo/tests/unit/style/viewport.rs b/servo/tests/unit/style/viewport.rs
new file mode 100644
index 0000000000..432f931329
--- /dev/null
+++ b/servo/tests/unit/style/viewport.rs
@@ -0,0 +1,383 @@
+/* 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/. */
+
+use cssparser::{Parser, ParserInput};
+use euclid::Scale;
+use euclid::Size2D;
+use servo_arc::Arc;
+use servo_config::prefs::{PREFS, PrefValue};
+use servo_url::ServoUrl;
+use style::context::QuirksMode;
+use style::media_queries::{Device, MediaList, MediaType};
+use style::parser::ParserContext;
+use style::shared_lock::{SharedRwLock, StylesheetGuards};
+use style::stylesheets::{CssRuleType, Stylesheet, StylesheetInDocument, Origin};
+use style::stylesheets::viewport_rule::*;
+use style::values::specified::LengthPercentageOrAuto::{self, Auto};
+use style::values::specified::NoCalcLength::{self, ViewportPercentage};
+use style::values::specified::ViewportPercentageLength::Vw;
+use style_traits::{ParsingMode, PinchZoomFactor};
+use style_traits::viewport::*;
+
+macro_rules! stylesheet {
+    ($css:expr, $origin:ident) => {
+        stylesheet!($css, $origin, SharedRwLock::new())
+    };
+    ($css:expr, $origin:ident, $shared_lock:expr) => {
+        Arc::new(Stylesheet::from_str(
+            $css,
+            ServoUrl::parse("http://localhost").unwrap(),
+            Origin::$origin,
+            Arc::new($shared_lock.wrap(MediaList::empty())),
+            $shared_lock,
+            None,
+            None,
+            QuirksMode::NoQuirks,
+            0
+        ))
+    }
+}
+
+fn test_viewport_rule<F>(css: &str,
+                         device: &Device,
+                         callback: F)
+    where F: Fn(&Vec<ViewportDescriptorDeclaration>, &str)
+{
+    PREFS.set("layout.viewport.enabled", PrefValue::Boolean(true));
+    let stylesheet = stylesheet!(css, Author);
+    let mut rule_count = 0;
+    stylesheet.effective_viewport_rules(&device, &stylesheet.shared_lock.read(), |rule| {
+        rule_count += 1;
+        callback(&rule.declarations, css);
+    });
+    assert!(rule_count > 0);
+}
+
+fn test_meta_viewport<F>(meta: &str, callback: F)
+    where F: Fn(&Vec<ViewportDescriptorDeclaration>, &str)
+{
+    if let Some(mut rule) = ViewportRule::from_meta(meta) {
+        // from_meta uses a hash-map to collect the declarations, so we need to
+        // sort them in a stable order for the tests
+        rule.declarations.sort_by(|a, b| {
+            let a = a.descriptor.discriminant_value();
+            let b = b.descriptor.discriminant_value();
+            a.cmp(&b)
+        });
+
+        callback(&rule.declarations, meta);
+    } else {
+        panic!("no @viewport rule for {}", meta);
+    }
+}
+
+macro_rules! assert_decl_len {
+    ($declarations:ident == 1) => {
+        assert_eq!($declarations.len(), 1,
+                "expected 1 declaration; have {}: {:?})",
+                $declarations.len(), $declarations)
+    };
+    ($declarations:ident == $len:expr) => {
+        assert_eq!($declarations.len(), $len,
+                "expected {} declarations; have {}: {:?})",
+                $len, $declarations.len(), $declarations)
+    }
+}
+
+macro_rules! viewport_length {
+    ($value:expr, px) => {
+        ViewportLength::Specified(LengthPercentageOrAuto::Length(NoCalcLength::from_px($value)))
+    };
+    ($value:expr, vw) => {
+        ViewportLength::Specified(LengthPercentageOrAuto::Length(ViewportPercentage(Vw($value))))
+    }
+}
+
+#[test]
+fn empty_viewport_rule() {
+    let device = Device::new(MediaType::screen(), Size2D::new(800., 600.), Scale::new(1.0));
+
+    test_viewport_rule("@viewport {}", &device, |declarations, css| {
+        println!("{}", css);
+        assert_decl_len!(declarations == 0);
+    });
+}
+
+macro_rules! assert_decl_eq {
+    ($d:expr, $origin:ident, $expected:ident: $value:expr) => {{
+        assert_eq!($d.origin, Origin::$origin);
+        assert_eq!($d.descriptor, ViewportDescriptor::$expected($value));
+        assert_eq!($d.important, false, "descriptor should not be !important");
+    }};
+    ($d:expr, $origin:ident, $expected:ident: $value:expr, !important) => {{
+        assert_eq!($d.origin, Origin::$origin);
+        assert_eq!($d.descriptor, ViewportDescriptor::$expected($value));
+        assert_eq!($d.important, true, "descriptor should be !important");
+    }};
+}
+
+#[test]
+fn simple_viewport_rules() {
+    let device = Device::new(MediaType::screen(), Size2D::new(800., 600.), Scale::new(1.0));
+
+    test_viewport_rule("@viewport { width: auto; height: auto;\
+                                    zoom: auto; min-zoom: 0; max-zoom: 200%;\
+                                    user-zoom: zoom; orientation: auto; }",
+                       &device, |declarations, css| {
+        println!("{}", css);
+        assert_decl_len!(declarations == 9);
+        assert_decl_eq!(&declarations[0], Author, MinWidth: ViewportLength::Specified(Auto));
+        assert_decl_eq!(&declarations[1], Author, MaxWidth: ViewportLength::Specified(Auto));
+        assert_decl_eq!(&declarations[2], Author, MinHeight: ViewportLength::Specified(Auto));
+        assert_decl_eq!(&declarations[3], Author, MaxHeight: ViewportLength::Specified(Auto));
+        assert_decl_eq!(&declarations[4], Author, Zoom: Zoom::Auto);
+        assert_decl_eq!(&declarations[5], Author, MinZoom: Zoom::Number(0.));
+        assert_decl_eq!(&declarations[6], Author, MaxZoom: Zoom::Percentage(2.));
+        assert_decl_eq!(&declarations[7], Author, UserZoom: UserZoom::Zoom);
+        assert_decl_eq!(&declarations[8], Author, Orientation: Orientation::Auto);
+    });
+
+    test_viewport_rule("@viewport { min-width: 200px; max-width: auto;\
+                                    min-height: 200px; max-height: auto; }",
+                       &device, |declarations, css| {
+        println!("{}", css);
+        assert_decl_len!(declarations == 4);
+        assert_decl_eq!(&declarations[0], Author, MinWidth: viewport_length!(200., px));
+        assert_decl_eq!(&declarations[1], Author, MaxWidth: ViewportLength::Specified(Auto));
+        assert_decl_eq!(&declarations[2], Author, MinHeight: viewport_length!(200., px));
+        assert_decl_eq!(&declarations[3], Author, MaxHeight: ViewportLength::Specified(Auto));
+    });
+}
+
+#[test]
+fn simple_meta_viewport_contents() {
+    test_meta_viewport("width=500, height=600", |declarations, meta| {
+        println!("{}", meta);
+        assert_decl_len!(declarations == 4);
+        assert_decl_eq!(&declarations[0], Author, MinWidth: ViewportLength::ExtendToZoom);
+        assert_decl_eq!(&declarations[1], Author, MaxWidth: viewport_length!(500., px));
+        assert_decl_eq!(&declarations[2], Author, MinHeight: ViewportLength::ExtendToZoom);
+        assert_decl_eq!(&declarations[3], Author, MaxHeight: viewport_length!(600., px));
+    });
+
+    test_meta_viewport("initial-scale=1.0", |declarations, meta| {
+        println!("{}", meta);
+        assert_decl_len!(declarations == 3);
+        assert_decl_eq!(&declarations[0], Author, MinWidth: ViewportLength::ExtendToZoom);
+        assert_decl_eq!(&declarations[1], Author, MaxWidth: ViewportLength::ExtendToZoom);
+        assert_decl_eq!(&declarations[2], Author, Zoom: Zoom::Number(1.));
+    });
+
+    test_meta_viewport("initial-scale=2.0, height=device-width", |declarations, meta| {
+        println!("{}", meta);
+        assert_decl_len!(declarations == 5);
+        assert_decl_eq!(&declarations[0], Author, MinWidth: ViewportLength::Specified(Auto));
+        assert_decl_eq!(&declarations[1], Author, MaxWidth: ViewportLength::Specified(Auto));
+        assert_decl_eq!(&declarations[2], Author, MinHeight: ViewportLength::ExtendToZoom);
+        assert_decl_eq!(&declarations[3], Author, MaxHeight: viewport_length!(100., vw));
+        assert_decl_eq!(&declarations[4], Author, Zoom: Zoom::Number(2.));
+    });
+
+    test_meta_viewport("width=480, initial-scale=2.0, user-scalable=1", |declarations, meta| {
+        println!("{}", meta);
+        assert_decl_len!(declarations == 4);
+        assert_decl_eq!(&declarations[0], Author, MinWidth: ViewportLength::ExtendToZoom);
+        assert_decl_eq!(&declarations[1], Author, MaxWidth: viewport_length!(480., px));
+        assert_decl_eq!(&declarations[2], Author, Zoom: Zoom::Number(2.));
+        assert_decl_eq!(&declarations[3], Author, UserZoom: UserZoom::Zoom);
+    });
+}
+
+#[test]
+fn cascading_within_viewport_rule() {
+    let device = Device::new(MediaType::screen(), Size2D::new(800., 600.), Scale::new(1.0));
+
+    // normal order of appearance
+    test_viewport_rule("@viewport { min-width: 200px; min-width: auto; }",
+                       &device, |declarations, css| {
+        println!("{}", css);
+        assert_decl_len!(declarations == 1);
+        assert_decl_eq!(&declarations[0], Author, MinWidth: ViewportLength::Specified(Auto));
+    });
+
+    // !important order of appearance
+    test_viewport_rule("@viewport { min-width: 200px !important; min-width: auto !important; }",
+                       &device, |declarations, css| {
+        println!("{}", css);
+        assert_decl_len!(declarations == 1);
+        assert_decl_eq!(&declarations[0], Author, MinWidth: ViewportLength::Specified(Auto), !important);
+    });
+
+    // !important vs normal
+    test_viewport_rule("@viewport { min-width: auto !important; min-width: 200px; }",
+                       &device, |declarations, css| {
+        println!("{}", css);
+        assert_decl_len!(declarations == 1);
+        assert_decl_eq!(&declarations[0], Author, MinWidth: ViewportLength::Specified(Auto), !important);
+    });
+
+    // normal longhands vs normal shorthand
+    test_viewport_rule("@viewport { min-width: 200px; max-width: 200px; width: auto; }",
+                       &device, |declarations, css| {
+        println!("{}", css);
+        assert_decl_len!(declarations == 2);
+        assert_decl_eq!(&declarations[0], Author, MinWidth: ViewportLength::Specified(Auto));
+        assert_decl_eq!(&declarations[1], Author, MaxWidth: ViewportLength::Specified(Auto));
+    });
+
+    // normal shorthand vs normal longhands
+    test_viewport_rule("@viewport { width: 200px; min-width: auto; max-width: auto; }",
+                       &device, |declarations, css| {
+        println!("{}", css);
+        assert_decl_len!(declarations == 2);
+        assert_decl_eq!(&declarations[0], Author, MinWidth: ViewportLength::Specified(Auto));
+        assert_decl_eq!(&declarations[1], Author, MaxWidth: ViewportLength::Specified(Auto));
+    });
+
+    // one !important longhand vs normal shorthand
+    test_viewport_rule("@viewport { min-width: auto !important; width: 200px; }",
+                       &device, |declarations, css| {
+        println!("{}", css);
+        assert_decl_len!(declarations == 2);
+        assert_decl_eq!(&declarations[0], Author, MinWidth: ViewportLength::Specified(Auto), !important);
+        assert_decl_eq!(&declarations[1], Author, MaxWidth: viewport_length!(200., px));
+    });
+
+    // both !important longhands vs normal shorthand
+    test_viewport_rule("@viewport { min-width: auto !important; max-width: auto !important; width: 200px; }",
+                       &device, |declarations, css| {
+        println!("{}", css);
+        assert_decl_len!(declarations == 2);
+        assert_decl_eq!(&declarations[0], Author, MinWidth: ViewportLength::Specified(Auto), !important);
+        assert_decl_eq!(&declarations[1], Author, MaxWidth: ViewportLength::Specified(Auto), !important);
+    });
+}
+
+#[test]
+fn multiple_stylesheets_cascading() {
+    PREFS.set("layout.viewport.enabled", PrefValue::Boolean(true));
+    let device = Device::new(MediaType::screen(), Size2D::new(800., 600.), Scale::new(1.0));
+    let shared_lock = SharedRwLock::new();
+    let stylesheets = vec![
+        stylesheet!("@viewport { min-width: 100px; min-height: 100px; zoom: 1; }",
+                    UserAgent,
+                    shared_lock.clone()),
+        stylesheet!("@viewport { min-width: 200px; min-height: 200px; }",
+                    User, shared_lock.clone()),
+        stylesheet!("@viewport { min-width: 300px; }",
+                    Author, shared_lock.clone())
+    ];
+
+    let declarations = Cascade::from_stylesheets(
+        stylesheets.iter().map(|s| (&**s, Origin::Author)),
+        &StylesheetGuards::same(&shared_lock.read()),
+        &device,
+    ).finish();
+    assert_decl_len!(declarations == 3);
+    assert_decl_eq!(&declarations[0], UserAgent, Zoom: Zoom::Number(1.));
+    assert_decl_eq!(&declarations[1], User, MinHeight: viewport_length!(200., px));
+    assert_decl_eq!(&declarations[2], Author, MinWidth: viewport_length!(300., px));
+
+    let stylesheets = vec![
+        stylesheet!("@viewport { min-width: 100px !important; }",
+                    UserAgent, shared_lock.clone()),
+        stylesheet!("@viewport { min-width: 200px !important; min-height: 200px !important; }",
+                    User, shared_lock.clone()),
+        stylesheet!("@viewport { min-width: 300px !important; min-height: 300px !important; zoom: 3 !important; }",
+                    Author, shared_lock.clone())
+    ];
+    let declarations = Cascade::from_stylesheets(
+        stylesheets.iter().map(|s| (&**s, Origin::Author)),
+        &StylesheetGuards::same(&shared_lock.read()),
+        &device,
+    ).finish();
+    assert_decl_len!(declarations == 3);
+    assert_decl_eq!(&declarations[0], UserAgent, MinWidth: viewport_length!(100., px), !important);
+    assert_decl_eq!(&declarations[1], User, MinHeight: viewport_length!(200., px), !important);
+    assert_decl_eq!(&declarations[2], Author, Zoom: Zoom::Number(3.), !important);
+}
+
+#[test]
+fn constrain_viewport() {
+    let url = ServoUrl::parse("http://localhost").unwrap();
+    let context = ParserContext::new(
+        Origin::Author,
+        &url,
+        Some(CssRuleType::Viewport),
+        ParsingMode::DEFAULT,
+        QuirksMode::NoQuirks,
+        None,
+        None,
+    );
+
+    macro_rules! from_css {
+        ($css:expr) => {
+            &ViewportRule::parse(&context, &mut Parser::new(&mut $css)).unwrap()
+        }
+    }
+
+    let initial_viewport = Size2D::new(800., 600.);
+    let device = Device::new(MediaType::screen(), initial_viewport, Scale::new(1.0));
+    let mut input = ParserInput::new("");
+    assert_eq!(ViewportConstraints::maybe_new(&device, from_css!(input), QuirksMode::NoQuirks), None);
+
+    let mut input = ParserInput::new("width: 320px auto");
+    assert_eq!(ViewportConstraints::maybe_new(&device, from_css!(input), QuirksMode::NoQuirks),
+               Some(ViewportConstraints {
+                   size: initial_viewport,
+
+                   initial_zoom: PinchZoomFactor::new(1.),
+                   min_zoom: None,
+                   max_zoom: None,
+
+                   user_zoom: UserZoom::Zoom,
+                   orientation: Orientation::Auto
+               }));
+
+    let mut input = ParserInput::new("width: 320px auto");
+    assert_eq!(ViewportConstraints::maybe_new(&device, from_css!(input), QuirksMode::NoQuirks),
+               Some(ViewportConstraints {
+                   size: initial_viewport,
+
+                   initial_zoom: PinchZoomFactor::new(1.),
+                   min_zoom: None,
+                   max_zoom: None,
+
+                   user_zoom: UserZoom::Zoom,
+                   orientation: Orientation::Auto
+               }));
+
+    let mut input = ParserInput::new("width: 800px; height: 600px;\
+                                                         zoom: 1;\
+                                                         user-zoom: zoom;\
+                                                         orientation: auto;");
+    assert_eq!(ViewportConstraints::maybe_new(&device,
+                                              from_css!(input),
+                                              QuirksMode::NoQuirks),
+               Some(ViewportConstraints {
+                   size: initial_viewport,
+
+                   initial_zoom: PinchZoomFactor::new(1.),
+                   min_zoom: None,
+                   max_zoom: None,
+
+                   user_zoom: UserZoom::Zoom,
+                   orientation: Orientation::Auto
+               }));
+
+    let initial_viewport = Size2D::new(200., 150.);
+    let device = Device::new(MediaType::screen(), initial_viewport, Scale::new(1.0));
+    let mut input = ParserInput::new("width: 320px auto");
+    assert_eq!(ViewportConstraints::maybe_new(&device, from_css!(input), QuirksMode::NoQuirks),
+               Some(ViewportConstraints {
+                   size: Size2D::new(320., 240.),
+
+                   initial_zoom: PinchZoomFactor::new(1.),
+                   min_zoom: None,
+                   max_zoom: None,
+
+                   user_zoom: UserZoom::Zoom,
+                   orientation: Orientation::Auto
+               }));
+}