bugfix #86 - box-sizing not parsed

Author: jogibear9988

src/AngleSharp.Css.Tests/Declarations/CssBoxSizingProperty.cs

@@ -0,0 +1,21 @@
+namespace AngleSharp.Css.Tests.Declarations
+{
+    using NUnit.Framework;
+    using static CssConstructionFunctions;
+
+    [TestFixture]
+    public class CssBoxSizingPropertyTests
+    {
+        [Test]
+        public void TestBoxSizing()
+        {
+            var source = "* { box-sizing: border-box; }";
+            var css = ParseStyleSheet(source);
+            var text = css.Rules[0].CssText;
+
+            var expected = "* { box-sizing: border-box }";
+            Assert.AreEqual(expected, text);
+        }
+    }
+}
+

src/AngleSharp.Css/Declarations/BoxSizingDeclaration.cs

@@ -0,0 +1,17 @@
+namespace AngleSharp.Css.Declarations
+{
+    using AngleSharp.Css.Dom;
+    using System;
+    using static ValueConverters;
+
+    static class BoxSizingDeclaration
+    {
+        public static String Name = PropertyNames.BoxSizing;
+
+        public static IValueConverter Converter = BoxModelConverter;
+
+        public static ICssValue InitialValue = InitialValues.BoxSizingDecl;
+
+        public static PropertyFlags Flags = PropertyFlags.Animatable;
+    }
+}

src/AngleSharp.Css/Factories/DefaultDeclarationFactory.cs

@@ -137,6 +137,13 @@ public class DefaultDeclarationFactory : IDeclarationFactory
                     initialValue: BoxShadowDeclaration.InitialValue,
                     flags: BoxShadowDeclaration.Flags)
             },
+            {
+                BoxSizingDeclaration.Name, new DeclarationInfo(
+                    name: BoxSizingDeclaration.Name,
+                    converter: BoxSizingDeclaration.Converter,
+                    initialValue: BoxSizingDeclaration.InitialValue,
+                    flags: BoxSizingDeclaration.Flags)
+            },
             {
                 ClearDeclaration.Name, new DeclarationInfo(
                     name: ClearDeclaration.Name,