Style: Do not immediately convert absolute specified lengths

The NoCalcLength::Absolute variant has been rewritten to accommodate
other units than Au with the new AbsoluteLength enum. This avoids loss
of precision for some operations.

The conversion from floating point absolute lengths to integer
application unit values adopts the same clamping limits as Gecko.

tests/unit/style/parsing/length.rs

@@ -2,9 +2,13 @@
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 
+use cssparser::Parser;
+use media_queries::CSSErrorReporterTest;
 use parsing::parse;
-use style::parser::Parse;
+use style::parser::{Parse, ParserContext};
+use style::stylesheets::Origin;
 use style::values::specified::length::Length;
+use style_traits::ToCss;
 
 #[test]
 fn test_calc() {
@@ -13,3 +17,14 @@ fn test_calc() {
     assert!(parse(Length::parse, "calc(1px + 2px )").is_ok());
     assert!(parse(Length::parse, "calc( 1px + 2px)").is_ok());
 }
+
+#[test]
+fn test_length_literals() {
+    assert_roundtrip_with_context!(Length::parse, "0.33px", "0.33px");
+    assert_roundtrip_with_context!(Length::parse, "0.33in", "0.33in");
+    assert_roundtrip_with_context!(Length::parse, "0.33cm", "0.33cm");
+    assert_roundtrip_with_context!(Length::parse, "0.33mm", "0.33mm");
+    assert_roundtrip_with_context!(Length::parse, "0.33q", "0.33q");
+    assert_roundtrip_with_context!(Length::parse, "0.33pt", "0.33pt");
+    assert_roundtrip_with_context!(Length::parse, "0.33pc", "0.33pc");
+}

tests/unit/style/properties/viewport.rs

@@ -6,7 +6,7 @@ use app_units::Au;
 use style::properties::PropertyDeclaration;
 use style::properties::longhands::border_top_width;
 use style::values::HasViewportPercentage;
-use style::values::specified::{Length, NoCalcLength, ViewportPercentageLength};
+use style::values::specified::{AbsoluteLength, Length, NoCalcLength, ViewportPercentageLength};
 
 #[test]
 fn has_viewport_percentage_for_specified_value() {
@@ -20,7 +20,7 @@ fn has_viewport_percentage_for_specified_value() {
 
     let pabs = PropertyDeclaration::BorderTopWidth(Box::new(
         border_top_width::SpecifiedValue::from_length(
-            Length::NoCalc(NoCalcLength::Absolute(Au(100)))
+            Length::NoCalc(NoCalcLength::Absolute(AbsoluteLength::Px(Au(100).to_f32_px())))
         )
     ));
     assert!(!pabs.has_viewport_percentage());

tests/unit/style/value.rs

@@ -5,14 +5,14 @@
 use app_units::Au;
 use cssparser::Parser;
 use style::values::HasViewportPercentage;
-use style::values::specified::{ViewportPercentageLength, NoCalcLength};
+use style::values::specified::{AbsoluteLength, ViewportPercentageLength, NoCalcLength};
 use style::values::specified::length::{CalcLengthOrPercentage, CalcUnit};
 
 #[test]
 fn length_has_viewport_percentage() {
     let l = NoCalcLength::ViewportPercentage(ViewportPercentageLength::Vw(100.));
     assert!(l.has_viewport_percentage());
-    let l = NoCalcLength::Absolute(Au(100));
+    let l = NoCalcLength::Absolute(AbsoluteLength::Px(Au(100).to_f32_px()));
     assert!(!l.has_viewport_percentage());
 }
 

tests/wpt/metadata-css/css-values-3_dev/html/min-width-001.htm.ini

@@ -1,3 +0,0 @@
-[min-width-001.htm]
-  type: reftest
-  expected: FAIL

tests/wpt/metadata-css/cssom-1_dev/html/cssstyledeclaration-csstext.htm.ini

@@ -3,15 +3,3 @@
   [uppercase value]
     expected: FAIL
 
-  [cssText order]
-    expected: FAIL
-
-  [another cssText order (non-alphabetical order)]
-    expected: FAIL
-
-  [whitespaces in value]
-    expected: FAIL
-
-  [invalid property does not appear]
-    expected: FAIL
-

tests/wpt/metadata-css/mediaqueries-3_dev/html/min-width-001.htm.ini

@@ -1,3 +0,0 @@
-[min-width-001.htm]
-  type: reftest
-  expected: FAIL

tests/wpt/mozilla/meta/MANIFEST.json

@@ -25171,7 +25171,7 @@
    "testharness"
   ],
   "mozilla/calc.html": [
-   "c239c441c90e4d4ed94458eae5b2defabb47e984",
+   "028fc71bdc9a99d552ba552036d38fb4eef11bc1",
    "testharness"
   ],
   "mozilla/canvas.initial.reset.2dstate.html": [

tests/wpt/mozilla/tests/mozilla/calc.html

@@ -41,7 +41,7 @@ var widthTests = [
     ['calc(10px + 10em - 10px)', 'calc(10em + 0px)', '160px'],
 
     // Fold absolute units
-    ['calc(1px + 1pt + 1pc + 1in + 1cm + 1mm)', 'calc(155.88333333333333px)', '155.88333333333333px'],
+    ['calc(1px + 1pt + 1pc + 1in + 1cm + 1mm)', 'calc(155.91666666666666px)', '155.91666666666666px'],
 
     // Alphabetical order
     ['calc(0ch + 0px + 0pt + 0pc + 0in + 0cm + 0mm + 0rem + 0em + 0ex + 0% + 0vw + 0vh + 0vmin + 0vmax)',