Added xxx-large keyword #77

Author: FlorianRappl

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

@@ -217,6 +217,18 @@ public void CssFontSizeAbsoluteImportantXxSmallLegal()
             Assert.AreEqual("xx-small", property.Value);
         }
 
+        [Test]
+        public void CssFontSizeAbsoluteImportantXxxLargeLegal()
+        {
+            var snippet = "font-size : xxx-large !important";
+            var property = ParseDeclaration(snippet);
+            Assert.AreEqual("font-size", property.Name);
+            Assert.IsTrue(property.IsImportant);
+            Assert.IsFalse(property.IsInherited);
+            Assert.IsTrue(property.HasValue);
+            Assert.AreEqual("xxx-large", property.Value);
+        }
+
         [Test]
         public void CssFontSizeAbsoluteMediumUppercaseLegal()
         {

src/AngleSharp.Css/Constants/CssKeywords.cs

@@ -1177,6 +1177,11 @@ public static class CssKeywords
         /// </summary>
         public static readonly String XxLarge = "xx-large";
 
+        /// <summary>
+        /// The xxx-large keyword.
+        /// </summary>
+        public static readonly String XxxLarge = "xxx-large";
+
         /// <summary>
         /// The larger keyword.
         /// </summary>

src/AngleSharp.Css/Constants/Map.cs

@@ -259,6 +259,7 @@ static class Map
             { CssKeywords.Large, new Length(1.2, Length.Unit.Em) },
             { CssKeywords.XLarge, new Length(1.5, Length.Unit.Em) },
             { CssKeywords.XxLarge, new Length(2.0, Length.Unit.Em) },
+            { CssKeywords.XxxLarge, new Length(3.0, Length.Unit.Em) },
             { CssKeywords.Larger, new Length(120.0, Length.Unit.Percent) },
             { CssKeywords.Smaller, new Length(80.0, Length.Unit.Percent) },
         };