Started working on nullable

src/AngleSharp.Css.nuspec

@@ -10,7 +10,7 @@
     <icon>logo.png</icon>
     <readme>README.md</readme>
     <requireLicenseAcceptance>false</requireLicenseAcceptance>
-    <description>Extends the CSSOM from the core AngleSharp library.</description>
+    <description>Extends the CSSOM from the core AngleSharp library. It parses CSS3 and is capable of performing a headless rendering evaluating the styles.</description>
     <releaseNotes>https://github.com/AngleSharp/AngleSharp.Css/blob/main/CHANGELOG.md</releaseNotes>
     <copyright>Copyright 2016-2024, AngleSharp</copyright>
     <tags>html html5 css css3 dom styling library anglesharp angle</tags>

src/AngleSharp.Css/AngleSharp.Css.csproj

@@ -4,10 +4,8 @@
     <RootNamespace>AngleSharp.Css</RootNamespace>
     <TargetFrameworks Condition=" '$(OS)' != 'Windows_NT' ">netstandard2.0;net6.0;net7.0;net8.0</TargetFrameworks>
     <TargetFrameworks Condition=" '$(OS)' == 'Windows_NT' ">netstandard2.0;net461;net472;net6.0;net7.0;net8.0</TargetFrameworks>
-    <SignAssembly>true</SignAssembly>
-    <AssemblyOriginatorKeyFile>Key.snk</AssemblyOriginatorKeyFile>
     <GenerateDocumentationFile>true</GenerateDocumentationFile>
-    <LangVersion>9</LangVersion>
+    <Nullable>enable</Nullable>
     <RepositoryUrl>https://github.com/AngleSharp/AngleSharp.Css</RepositoryUrl>
     <RepositoryType>git</RepositoryType>
     <PublishRepositoryUrl>true</PublishRepositoryUrl>

src/AngleSharp.Css/BrowsingContextExtensions.cs

@@ -20,7 +20,7 @@ namespace AngleSharp.Css
         /// <param name="address">The address of the resource.</param>
         /// <param name="element">The hosting element.</param>
         /// <returns>The async task.</returns>
-        public static Task<IStyleSheet> OpenStyleSheetAsync(this IBrowsingContext context, Url address, IElement element) =>
+        public static Task<IStyleSheet?> OpenStyleSheetAsync(this IBrowsingContext context, Url address, IElement element) =>
             context.OpenStyleSheetAsync(address, element, CancellationToken.None);
 
         /// <summary>
@@ -31,22 +31,21 @@ namespace AngleSharp.Css
         /// <param name="element">The hosting element.</param>
         /// <param name="cancel">The cancellation token.</param>
         /// <returns>The async task.</returns>
-        public static async Task<IStyleSheet> OpenStyleSheetAsync(this IBrowsingContext context, Url address, IElement element, CancellationToken cancel)
+        public static async Task<IStyleSheet?> OpenStyleSheetAsync(this IBrowsingContext context, Url address, IElement element, CancellationToken cancel)
         {
             var loader = context.GetService<IResourceLoader>();
             var service = context.GetCssStyling();
 
-            if (loader != null && service != null)
+            if (loader is not null && service is not null)
             {
                 var request = element.CreateRequestFor(address);
                 var download = loader.FetchAsync(request);
 
-                using (var response = await download.Task.ConfigureAwait(false))
-                {
-                    var options = new StyleOptions(element?.Owner ?? context.Active) { Element = element };
+                using var response = await download.Task.ConfigureAwait(false);
+                var document = element.Owner ?? context.Active ?? throw new InvalidOperationException("Could not find a related documented.");
+                var options = new StyleOptions(document) { Element = element };
                 return await service.ParseStylesheetAsync(response, options, cancel).ConfigureAwait(false);
             }
-            }
 
             return null;
         }
@@ -57,7 +56,7 @@ namespace AngleSharp.Css
             return factory.Create(propertyName);
         }
 
-        internal static ICssProperty CreateShorthand(this IBrowsingContext context, String name, ICssValue[] longhands, Boolean important)
+        internal static ICssProperty? CreateShorthand(this IBrowsingContext context, String name, ICssValue[] longhands, Boolean important)
         {
             var factory = context.GetFactory<IDeclarationFactory>();
             var info = factory.Create(name);
@@ -79,7 +78,7 @@ namespace AngleSharp.Css
             return factory.CreateProperties(info.Longhands, values, shorthand.IsImportant);
         }
 
-        internal static CssProperty CreateProperty(this IBrowsingContext context, String propertyName)
+        internal static CssProperty? CreateProperty(this IBrowsingContext context, String propertyName)
         {
             var info = context.GetDeclarationInfo(propertyName);
 
@@ -102,7 +101,7 @@ namespace AngleSharp.Css
 
         private static ICssProperty[] CreateProperties(this IDeclarationFactory factory, String[] names, ICssValue[] values, Boolean important)
         {
-            if (values != null && values.Length == names.Length)
+            if (values.Length == names.Length)
             {
                 var properties = new ICssProperty[names.Length];
 
@@ -115,7 +114,7 @@ namespace AngleSharp.Css
                 return properties;
             }
 
-            return null;
+            return [];
         }
     }
 }

src/AngleSharp.Css/Constants/InitialValues.cs

@@ -18,7 +18,7 @@ namespace AngleSharp.Css
         public static readonly ICssValue BackgroundRepeatDecl = new CssImageRepeatsValue(BackgroundRepeatHorizontalDecl, BackgroundRepeatVerticalDecl);
         public static readonly ICssValue BackgroundPositionXDecl = new CssLengthValue(0, CssLengthValue.Unit.Percent);
         public static readonly ICssValue BackgroundPositionYDecl = new CssLengthValue(0, CssLengthValue.Unit.Percent);
-        public static readonly ICssValue BackgroundPositionDecl = new CssTupleValue(new [] { BackgroundPositionXDecl, BackgroundPositionYDecl });
+        public static readonly ICssValue BackgroundPositionDecl = new CssTupleValue([BackgroundPositionXDecl, BackgroundPositionYDecl]);
         public static readonly ICssValue BackgroundSizeDecl = new CssBackgroundSizeValue(new CssConstantValue<CssLengthValue>(CssKeywords.Auto, CssLengthValue.Auto), new CssConstantValue<CssLengthValue>(CssKeywords.Auto, CssLengthValue.Auto));
         public static readonly ICssValue BackgroundOriginDecl = new CssConstantValue<BoxModel>(CssKeywords.BorderBox, BoxModel.PaddingBox);
         public static readonly ICssValue BackgroundClipDecl = new CssConstantValue<BoxModel>(CssKeywords.BorderBox, BoxModel.BorderBox);
@@ -204,13 +204,13 @@ namespace AngleSharp.Css
         public static readonly ICssValue ZIndexDecl = new CssConstantValue<CssLengthValue>(CssKeywords.Auto, CssLengthValue.Auto);
         public static readonly ICssValue WidthDecl = CssLengthValue.Auto;
         public static readonly ICssValue HeightDecl = CssLengthValue.Auto;
-        public static readonly ICssValue ScrollbarTrackColorDecl = CssColors.GetColor("scrollbar");
-        public static readonly ICssValue ScrollbarShadowColorDecl = CssColors.GetColor("threeddarkshadow");
-        public static readonly ICssValue ScrollbarHighlightColorDecl = CssColors.GetColor("threedhighlight");
-        public static readonly ICssValue ScrollbarFaceColorDecl = CssColors.GetColor("threedface");
-        public static readonly ICssValue ScrollbarDarkshadowColorDecl = CssColors.GetColor("threeddarkshadow");
+        public static readonly ICssValue ScrollbarTrackColorDecl = CssColors.GetColor("scrollbar")!;
+        public static readonly ICssValue ScrollbarShadowColorDecl = CssColors.GetColor("threeddarkshadow")!;
+        public static readonly ICssValue ScrollbarHighlightColorDecl = CssColors.GetColor("threedhighlight")!;
+        public static readonly ICssValue ScrollbarFaceColorDecl = CssColors.GetColor("threedface")!;
+        public static readonly ICssValue ScrollbarDarkshadowColorDecl = CssColors.GetColor("threeddarkshadow")!;
         public static readonly ICssValue ScrollbarBaseColorDecl = CssColorValue.Transparent;
-        public static readonly ICssValue ScrollbarArrowColorDecl = CssColors.GetColor("buttontext");
+        public static readonly ICssValue ScrollbarArrowColorDecl = CssColors.GetColor("buttontext")!;
         public static readonly ICssValue Scrollbar3dLightColorDecl = CssColorValue.White;
         public static readonly ICssValue LetterSpacingDecl = CssLengthValue.Normal;
         public static readonly ICssValue FontSizeAdjustDecl = new CssLengthValue(1.0, CssLengthValue.Unit.Em);

src/AngleSharp.Css/Converters/ClassValueConverter.cs

@@ -4,15 +4,10 @@
     using AngleSharp.Text;
     using System;
 
-    sealed class ClassValueConverter<T> : IValueConverter
+    sealed class ClassValueConverter<T>(Func<StringSource, T> converter) : IValueConverter
         where T : class, ICssValue
     {
-        private readonly Func<StringSource, T> _converter;
-
-        public ClassValueConverter(Func<StringSource, T> converter)
-        {
-            _converter = converter;
-        }
+        private readonly Func<StringSource, T> _converter = converter;
 
         public ICssValue Convert(StringSource source)
         {

src/AngleSharp.Css/Converters/CounterValueConverter.cs

@@ -4,23 +4,17 @@ namespace AngleSharp.Css.Converters
     using AngleSharp.Css.Parser;
     using AngleSharp.Css.Values;
     using AngleSharp.Text;
-    using System;
     using System.Collections.Generic;
 
-    sealed class CounterValueConverter : IValueConverter
+    sealed class CounterValueConverter(ICssValue defaultValue) : IValueConverter
     {
-        private static readonly CssCounterValue[] NoneValue = Array.Empty<CssCounterValue>();
+        private static readonly CssCounterValue[] NoneValue = [];
 
-        private readonly ICssValue _defaultValue;
+        private readonly ICssValue _defaultValue = defaultValue;
 
-        public CounterValueConverter(ICssValue defaultValue)
+        public ICssValue? Convert(StringSource source)
         {
-            _defaultValue = defaultValue;
-        }
-
-        public ICssValue Convert(StringSource source)
-        {
-            var counters = new List<CssCounterValue>();
+            var counters = new List<ICssValue>();
 
             if (!source.IsIdentifier(CssKeywords.None))
             {
@@ -39,7 +33,7 @@ namespace AngleSharp.Css.Converters
                     counters.Add(new CssCounterValue(name, value));
                 }
 
-                return new CssTupleValue<CssCounterValue>(counters.ToArray());
+                return new CssTupleValue([.. counters]);
             }
 
             return new CssConstantValue<CssCounterValue[]>(CssKeywords.None, NoneValue);

src/AngleSharp.Css/Converters/DictionaryValueConverter.cs

@@ -7,22 +7,16 @@ namespace AngleSharp.Css.Converters
     using System;
     using System.Collections.Generic;
 
-    sealed class DictionaryValueConverter<T> : IValueConverter
+    sealed class DictionaryValueConverter<T>(IDictionary<String, T> values) : IValueConverter
     {
-        private readonly IDictionary<String, T> _values;
+        private readonly IDictionary<String, T> _values = values;
 
-        public DictionaryValueConverter(IDictionary<String, T> values)
-        {
-            _values = values;
-        }
-
-        public ICssValue Convert(StringSource source)
+        public ICssValue? Convert(StringSource source)
         {
             var pos = source.Index;
             var ident = source.ParseIdent();
-            var mode = default(T);
 
-            if (ident != null && _values.TryGetValue(ident, out mode))
+            if (ident is not null && _values.TryGetValue(ident, out var mode))
             {
                 return new CssConstantValue<T>(ident.ToLowerInvariant(), mode);
             }

src/AngleSharp.Css/Converters/FlowRelativeValueConverter.cs

@@ -6,28 +6,23 @@ namespace AngleSharp.Css.Converters
     using AngleSharp.Text;
     using System;
 
-    sealed class FlowRelativeValueConverter : IValueConverter
+    sealed class FlowRelativeValueConverter(IValueConverter converter) : IValueConverter
     {
-        private readonly IValueConverter _converter;
+        private readonly IValueConverter _converter = converter;
 
-        public FlowRelativeValueConverter(IValueConverter converter)
-        {
-            _converter = converter;
-        }
-
-        public ICssValue Convert(StringSource source)
+        public ICssValue? Convert(StringSource source)
         {
             var options = new ICssValue[2];
             var length = 0;
 
             for (var i = 0; i < options.Length; i++)
             {
-                options[i] = _converter.Convert(source);
+                var option = _converter.Convert(source);
                 source.SkipSpacesAndComments();
 
-                if (options[length] != null)
+                if (option is not null)
                 {
-                    length++;
+                    options[length++] = option;
                 }
             }
 

src/AngleSharp.Css/Converters/IdentifierValueConverter.cs

@@ -6,20 +6,15 @@ namespace AngleSharp.Css.Converters
     using AngleSharp.Text;
     using System;
 
-    sealed class IdentifierValueConverter : IValueConverter
+    sealed class IdentifierValueConverter(Func<StringSource, String> check) : IValueConverter
     {
-        private readonly Func<StringSource, String> _check;
+        private readonly Func<StringSource, String> _check = check;
 
-        public IdentifierValueConverter(Func<StringSource, String> check)
-        {
-            _check = check;
-        }
-
-        public ICssValue Convert(StringSource source)
+        public ICssValue? Convert(StringSource source)
         {
             var result = _check.Invoke(source);
 
-            if (result != null)
+            if (result is not null)
             {
                 return new CssIdentifierValue(result);
             }
@@ -28,18 +23,12 @@ namespace AngleSharp.Css.Converters
         }
     }
 
-    sealed class IdentifierValueConverter<T> : IValueConverter
+    sealed class IdentifierValueConverter<T>(String identifier, T result) : IValueConverter
     {
-        private readonly String _identifier;
-        private readonly T _result;
+        private readonly String _identifier = identifier;
+        private readonly T _result = result;
 
-        public IdentifierValueConverter(String identifier, T result)
-        {
-            _identifier = identifier;
-            _result = result;
-        }
-
-        public ICssValue Convert(StringSource source)
+        public ICssValue? Convert(StringSource source)
         {
             if (source.IsIdentifier(_identifier))
             {

src/AngleSharp.Css/Converters/ListValueConverter.cs

@@ -6,16 +6,11 @@ namespace AngleSharp.Css.Converters
     using AngleSharp.Text;
     using System.Collections.Generic;
 
-    sealed class ListValueConverter : IValueConverter
+    sealed class ListValueConverter(IValueConverter converter) : IValueConverter
     {
-        private readonly IValueConverter _converter;
+        private readonly IValueConverter _converter = converter;
 
-        public ListValueConverter(IValueConverter converter)
-        {
-            _converter = converter;
-        }
-
-        public ICssValue Convert(StringSource source)
+        public ICssValue? Convert(StringSource source)
         {
             var values = new List<ICssValue>();
 
@@ -33,7 +28,7 @@ namespace AngleSharp.Css.Converters
                 values.Add(value);
             }
 
-            return values.Count > 0 ? new CssListValue(values.ToArray()) : null;
+            return values.Count > 0 ? new CssListValue([.. values]) : null;
         }
     }
 }

src/AngleSharp.Css/Converters/OneOrMoreValueConverter.cs

@@ -7,22 +7,14 @@ namespace AngleSharp.Css.Converters
     using System;
     using System.Collections.Generic;
 
-    sealed class OneOrMoreValueConverter : IValueConverter
+    sealed class OneOrMoreValueConverter(IValueConverter converter, Int32 minimum, Int32 maximum, String separator) : IValueConverter
     {
-        private readonly IValueConverter _converter;
-        private readonly Int32 _minimum;
-        private readonly Int32 _maximum;
-        private readonly String _separator;
+        private readonly IValueConverter _converter = converter;
+        private readonly Int32 _minimum = minimum;
+        private readonly Int32 _maximum = maximum;
+        private readonly String _separator = separator;
 
-        public OneOrMoreValueConverter(IValueConverter converter, Int32 minimum, Int32 maximum, String separator)
-        {
-            _converter = converter;
-            _minimum = minimum;
-            _maximum = maximum;
-            _separator = separator;
-        }
-
-        public ICssValue Convert(StringSource source)
+        public ICssValue? Convert(StringSource source)
         {
             var values = new List<ICssValue>();
 
@@ -37,7 +29,7 @@ namespace AngleSharp.Css.Converters
                 values.Add(value);
             }
 
-            return values.Count >= _minimum ? new CssTupleValue(values.ToArray(), _separator) : null;
+            return values.Count >= _minimum ? new CssTupleValue([.. values], _separator) : null;
         }
     }
 }

src/AngleSharp.Css/Converters/OptionValueConverter.cs

@@ -4,18 +4,12 @@ namespace AngleSharp.Css.Converters
     using AngleSharp.Css.Values;
     using AngleSharp.Text;
 
-    sealed class OptionValueConverter : IValueConverter
+    sealed class OptionValueConverter(IValueConverter converter, ICssValue defaultValue) : IValueConverter
     {
-        private readonly IValueConverter _converter;
-        private readonly ICssValue _defaultValue;
+        private readonly IValueConverter _converter = converter;
+        private readonly ICssValue _defaultValue = defaultValue;
 
-        public OptionValueConverter(IValueConverter converter, ICssValue defaultValue)
-        {
-            _converter = converter;
-            _defaultValue = defaultValue;
-        }
-
-        public ICssValue Convert(StringSource source)
+        public ICssValue? Convert(StringSource source)
         {
             if (source.IsDone || source.Current == Symbols.Comma)
             {

src/AngleSharp.Css/Converters/OrValueConverter.cs

@@ -1,19 +1,14 @@
-namespace AngleSharp.Css.Converters
+namespace AngleSharp.Css.Converters
 {
     using AngleSharp.Css.Dom;
     using AngleSharp.Css.Parser;
     using AngleSharp.Text;
 
-    sealed class OrValueConverter : IValueConverter
+    sealed class OrValueConverter(IValueConverter[] converters) : IValueConverter
     {
-        private readonly IValueConverter[] _converters;
+        private readonly IValueConverter[] _converters = converters;
 
-        public OrValueConverter(IValueConverter[] converters)
-        {
-            _converters = converters;
-        }
-
-        public ICssValue Convert(StringSource source)
+        public ICssValue? Convert(StringSource source)
         {
             var start = source.Index;
 

src/AngleSharp.Css/Converters/OrderedOptionsConverter.cs

@@ -5,14 +5,9 @@ namespace AngleSharp.Css.Converters
     using AngleSharp.Css.Values;
     using AngleSharp.Text;
 
-    sealed class OrderedOptionsConverter: IValueConverter
+    sealed class OrderedOptionsConverter(params IValueConverter[] converters) : IValueConverter
     {
-        private readonly IValueConverter[] _converters;
-
-        public OrderedOptionsConverter(params IValueConverter[] converters)
-        {
-            _converters = converters;
-        }
+        private readonly IValueConverter[] _converters = converters;
 
         public ICssValue Convert(StringSource source)
         {

src/AngleSharp.Css/Converters/PeriodicValueConverter.cs

@@ -6,28 +6,23 @@ namespace AngleSharp.Css.Converters
     using AngleSharp.Text;
     using System;
 
-    sealed class PeriodicValueConverter : IValueConverter
+    sealed class PeriodicValueConverter(IValueConverter converter) : IValueConverter
     {
-        private readonly IValueConverter _converter;
+        private readonly IValueConverter _converter = converter;
 
-        public PeriodicValueConverter(IValueConverter converter)
-        {
-            _converter = converter;
-        }
-
-        public ICssValue Convert(StringSource source)
+        public ICssValue? Convert(StringSource source)
         {
             var options = new ICssValue[4];
             var length = 0;
 
             for (var i = 0; i < options.Length; i++)
             {
-                options[i] = _converter.Convert(source);
+                var option = _converter.Convert(source);
                 source.SkipSpacesAndComments();
 
-                if (options[length] != null)
+                if (option is not null)
                 {
-                    length++;
+                    options[length++] = option;
                 }
             }
 

src/AngleSharp.Css/Converters/RadiusValueConverter.cs

@@ -6,28 +6,23 @@ namespace AngleSharp.Css.Converters
     using AngleSharp.Text;
     using System;
 
-    sealed class RadiusValueConverter : IValueConverter
+    sealed class RadiusValueConverter(IValueConverter converter) : IValueConverter
     {
-        private readonly IValueConverter _converter;
+        private readonly IValueConverter _converter = converter;
 
-        public RadiusValueConverter(IValueConverter converter)
-        {
-            _converter = converter;
-        }
-
-        public ICssValue Convert(StringSource source)
+        public ICssValue? Convert(StringSource source)
         {
             var options = new ICssValue[2];
             var length = 0;
 
             for (var i = 0; i < options.Length; i++)
             {
-                options[i] = _converter.Convert(source);
+                var option = _converter.Convert(source);
                 source.SkipSpacesAndComments();
 
-                if (options[length] != null)
+                if (option is not null)
                 {
-                    length++;
+                    options[length++] = option;
                 }
             }
 

src/AngleSharp.Css/Converters/SeparatedEnumsConverter.cs

@@ -5,17 +5,12 @@ namespace AngleSharp.Css.Converters
     using AngleSharp.Text;
     using System;
 
-    sealed class SeparatedEnumsConverter : IValueConverter
+    sealed class SeparatedEnumsConverter(IValueConverter[] converters, Char seperator) : IValueConverter
     {
-        private readonly IValueConverter[] _converters;
-        private readonly Char _seperator;
+        private readonly IValueConverter[] _converters = converters;
+        private readonly Char _seperator = seperator;
 
-        public SeparatedEnumsConverter(IValueConverter[] converters, Char seperator)
-        {
-            _converters = converters;
-            _seperator = seperator;
-        }
-        public ICssValue Convert(StringSource source)
+        public ICssValue? Convert(StringSource source)
         {
             var value = _converters[0].Convert(source);
 

src/AngleSharp.Css/Converters/SeparatorConverter.cs

@@ -5,18 +5,12 @@ namespace AngleSharp.Css.Converters
     using AngleSharp.Text;
     using System;
 
-    sealed class SeparatorConverter : IValueConverter
+    sealed class SeparatorConverter(IValueConverter converter, Char seperator) : IValueConverter
     {
-        private readonly IValueConverter _converter;
-        private readonly Char _seperator;
+        private readonly IValueConverter _converter = converter;
+        private readonly Char _seperator = seperator;
 
-        public SeparatorConverter(IValueConverter converter, Char seperator)
-        {
-            _converter = converter;
-            _seperator = seperator;
-        }
-
-        public ICssValue Convert(StringSource source)
+        public ICssValue? Convert(StringSource source)
         {
             var value = _converter.Convert(source);
 

src/AngleSharp.Css/Converters/StandardValueConverter.cs

@@ -5,16 +5,11 @@ namespace AngleSharp.Css.Converters
     using AngleSharp.Css.Values;
     using AngleSharp.Text;
 
-    sealed class StandardValueConverter : IValueConverter
+    sealed class StandardValueConverter(ICssValue defaultValue) : IValueConverter
     {
-        private readonly ICssValue _defaultValue;
+        private readonly ICssValue _defaultValue = defaultValue;
 
-        public StandardValueConverter(ICssValue defaultValue)
-        {
-            _defaultValue = defaultValue;
-        }
-
-        public ICssValue Convert(StringSource source)
+        public ICssValue? Convert(StringSource source)
         {
             var ident = source.ParseIdent();
 

src/AngleSharp.Css/Converters/StructValueConverter.cs

@@ -4,19 +4,11 @@ namespace AngleSharp.Css.Converters
     using AngleSharp.Text;
     using System;
 
-    sealed class StructValueConverter<T> : IValueConverter
+    sealed class StructValueConverter<T>(Func<StringSource, T?> converter) : IValueConverter
         where T : struct, ICssValue
     {
-        private readonly Func<StringSource, T?> _converter;
+        private readonly Func<StringSource, T?> _converter = converter;
 
-        public StructValueConverter(Func<StringSource, T?> converter)
-        {
-            _converter = converter;
-        }
-
-        public ICssValue Convert(StringSource source)
-        {
-            return _converter.Invoke(source);
-        }
+        public ICssValue? Convert(StringSource source) => _converter.Invoke(source);
     }
 }

src/AngleSharp.Css/Converters/UnorderedOptionsConverter.cs

@@ -5,14 +5,9 @@ namespace AngleSharp.Css.Converters
     using AngleSharp.Css.Values;
     using AngleSharp.Text;
 
-    sealed class UnorderedOptionsConverter : IValueConverter
+    sealed class UnorderedOptionsConverter(params IValueConverter[] converters) : IValueConverter
     {
-        private readonly IValueConverter[] _converters;
-
-        public UnorderedOptionsConverter(params IValueConverter[] converters)
-        {
-            _converters = converters;
-        }
+        private readonly IValueConverter[] _converters = converters;
 
         public ICssValue Convert(StringSource source)
         {

src/AngleSharp.Css/CssConfigurationExtensions.cs

@@ -62,7 +62,7 @@ namespace AngleSharp
         /// <param name="configuration">The configuration to extend.</param>
         /// <param name="renderDevice">The custom device to register, if any.</param>
         /// <returns>The new instance with the render device.</returns>
-        public static IConfiguration WithRenderDevice(this IConfiguration configuration, IRenderDevice renderDevice = null) =>
+        public static IConfiguration WithRenderDevice(this IConfiguration configuration, IRenderDevice? renderDevice = null) =>
             configuration.WithOnly<IRenderDevice>(renderDevice ?? new DefaultRenderDevice());
     }
 }

src/AngleSharp.Css/CssDefaultStyleSheetProvider.cs

@@ -8,7 +8,7 @@ namespace AngleSharp.Css
     {
         #region Fields
 
-        private ICssStyleSheet _default;
+        private ICssStyleSheet? _default;
 
         #endregion
 

src/AngleSharp.Css/CssStylingService.cs

@@ -33,13 +33,13 @@ namespace AngleSharp.Css
         public async Task<IStyleSheet> ParseStylesheetAsync(IResponse response, StyleOptions options, CancellationToken cancel)
         {
             var context = options.Document.Context;
-            var parser = context.GetService<ICssParser>();
+            var parser = context.GetService<ICssParser>() ?? throw new InvalidOperationException("No parser found.");
             var url = response.Address?.Href;
             var source = new TextSource(response.Content);
             var sheet = new CssStyleSheet(context, source)
             {
                 IsDisabled = options.IsDisabled,
-                Href = url
+                Href = url!
             };
             sheet.SetOwner(options.Element);
             return await parser.ParseStyleSheetAsync(sheet, cancel).ConfigureAwait(false);

src/AngleSharp.Css/DeclarationInfo.cs

@@ -7,61 +7,51 @@ namespace AngleSharp.Css
     /// <summary>
     /// A collection of useful information regarding a CSS declaration.
     /// </summary>
-    public class DeclarationInfo
-    {
-        /// <summary>
+    /// <remarks>
     /// Constructs a new declaration info.
-        /// </summary>
+    /// </remarks>
     /// <param name="name">The name of the declaration.</param>
     /// <param name="converter">The value converter.</param>
     /// <param name="flags">The property flags.</param>
     /// <param name="initialValue">The initial value, if any.</param>
     /// <param name="shorthands">The names of the associated shorthand declarations, if any.</param>
     /// <param name="longhands">The names of the associated longhand declarations, if any.</param>
-        public DeclarationInfo(String name, IValueConverter converter, PropertyFlags flags = PropertyFlags.None, ICssValue initialValue = null, String[] shorthands = null, String[] longhands = null)
+    public class DeclarationInfo(String name, IValueConverter converter, PropertyFlags flags = PropertyFlags.None, ICssValue? initialValue = null, String[]? shorthands = null, String[]? longhands = null)
     {
-            Name = name;
-            Converter = initialValue != null ? Or(converter, AssignInitial(initialValue)) : converter;
-            Aggregator = converter as IValueAggregator;
-            Flags = flags;
-            InitialValue = initialValue;
-            Shorthands = shorthands ?? Array.Empty<String>();
-            Longhands = longhands ?? Array.Empty<String>();
-        }
 
         /// <summary>
         /// Gets the declaration name.
         /// </summary>
-        public String Name { get; }
+        public String Name { get; } = name;
 
         /// <summary>
         /// Gets the initial value of the declaration, if any.
         /// </summary>
-        public ICssValue InitialValue { get; }
+        public ICssValue? InitialValue { get; } = initialValue;
 
         /// <summary>
         /// Gets the associated value converter.
         /// </summary>
-        public IValueConverter Converter { get; }
+        public IValueConverter Converter { get; } = initialValue != null ? Or(converter, AssignInitial(initialValue)) : converter;
 
         /// <summary>
         /// Gets the value aggregator, if any.
         /// </summary>
-        public IValueAggregator Aggregator { get; }
+        public IValueAggregator? Aggregator { get; } = converter as IValueAggregator;
 
         /// <summary>
         /// Gets the flags of the declaration.
         /// </summary>
-        public PropertyFlags Flags { get; }
+        public PropertyFlags Flags { get; } = flags;
 
         /// <summary>
         /// Gets the names of related shorthand declarations.
         /// </summary>
-        public String[] Shorthands { get; }
+        public String[] Shorthands { get; } = shorthands ?? [];
 
         /// <summary>
         /// Gets the names of related required longhand declarations.
         /// </summary>
-        public String[] Longhands { get; }
+        public String[] Longhands { get; } = longhands ?? [];
     }
 }

src/AngleSharp.Css/Declarations/AnimationDeclaration.cs

@@ -14,12 +14,12 @@ namespace AngleSharp.Css.Declarations
 
         public static IValueConverter Converter = new AnimationAggregator();
 
-        public static ICssValue InitialValue = null;
+        public static ICssValue? InitialValue = null;
 
         public static PropertyFlags Flags = PropertyFlags.Shorthand;
 
-        public static String[] Longhands = new[]
-        {
+        public static String[] Longhands =
+        [
             PropertyNames.AnimationDuration,
             PropertyNames.AnimationTimingFunction,
             PropertyNames.AnimationDelay,
@@ -28,7 +28,7 @@ namespace AngleSharp.Css.Declarations
             PropertyNames.AnimationFillMode,
             PropertyNames.AnimationPlayState,
             PropertyNames.AnimationName,
-        };
+        ];
 
         sealed class AnimationAggregator : IValueAggregator, IValueConverter
         {
@@ -42,9 +42,9 @@ namespace AngleSharp.Css.Declarations
                 PlayStateConverter.Option(InitialValues.AnimationPlayStateDecl),
                 IdentifierConverter.Option(InitialValues.AnimationNameDecl)).FromList();
 
-            public ICssValue Convert(StringSource source) => ListConverter.Convert(source);
+            public ICssValue? Convert(StringSource source) => ListConverter.Convert(source);
 
-            public ICssValue Merge(ICssValue[] values)
+            public ICssValue? Merge(ICssValue[] values)
             {
                 var duration = values[0] as CssListValue;
                 var timing = values[1] as CssListValue;
@@ -63,12 +63,12 @@ namespace AngleSharp.Css.Declarations
                 return null;
             }
 
-            public ICssValue[] Split(ICssValue value)
+            public ICssValue?[]? Split(ICssValue value)
             {
                 if (value is CssListValue list)
                 {
-                    return new[]
-                    {
+                    return
+                    [
                         CreateMultiple(list, 0),
                         CreateMultiple(list, 1),
                         CreateMultiple(list, 2),
@@ -77,13 +77,13 @@ namespace AngleSharp.Css.Declarations
                         CreateMultiple(list, 5),
                         CreateMultiple(list, 6),
                         CreateMultiple(list, 7),
-                    };
+                    ];
                 }
 
                 return null;
             }
 
-            private static ICssValue CreateMultiple(CssListValue animation, Int32 index)
+            private static ICssValue? CreateMultiple(CssListValue animation, Int32 index)
             {
                 var values = animation.Items.OfType<CssTupleValue>().Select(m => m.Items[index]);
 
@@ -95,15 +95,15 @@ namespace AngleSharp.Css.Declarations
                 return null;
             }
 
-            private static ICssValue CreateValue(CssListValue duration, CssListValue timing, CssListValue delay, CssListValue iterationCount, CssListValue direction, CssListValue fillMode, CssListValue playState, CssListValue name)
+            private static ICssValue CreateValue(CssListValue? duration, CssListValue? timing, CssListValue? delay, CssListValue? iterationCount, CssListValue? direction, CssListValue? fillMode, CssListValue? playState, CssListValue? name)
             {
-                var items = (duration ?? timing ?? delay ?? iterationCount ?? direction ?? fillMode ?? playState ?? name).Items;
-                var layers = new ICssValue[items.Length];
+                var items = (duration ?? timing ?? delay ?? iterationCount ?? direction ?? fillMode ?? playState ?? name)?.Items;
+                var layers = new ICssValue[items?.Length ?? 0];
 
-                for (var i = 0; i < items.Length; i++)
-                {
-                    layers[i] = new CssTupleValue(new[]
+                for (var i = 0; i < layers.Length; i++)
                 {
+                    layers[i] = new CssTupleValue(
+                    [
                         GetValue(duration, i),
                         GetValue(timing, i),
                         GetValue(delay, i),
@@ -112,13 +112,13 @@ namespace AngleSharp.Css.Declarations
                         GetValue(fillMode, i),
                         GetValue(playState, i),
                         GetValue(name, i),
-                    });
+                    ]);
                 }
 
                 return new CssListValue(layers);
             }
 
-            private static ICssValue GetValue(CssListValue container, Int32 index)
+            private static ICssValue? GetValue(CssListValue? container, Int32 index)
             {
                 if (container != null && index < container.Items.Length)
                 {

src/AngleSharp.Css/Declarations/AnimationDelayDeclaration.cs

@@ -9,10 +9,10 @@ namespace AngleSharp.Css.Declarations
     {
         public static String Name = PropertyNames.AnimationDelay;
 
-        public static String[] Shorthands = new[]
-        {
+        public static String[] Shorthands =
+        [
             PropertyNames.Animation,
-        };
+        ];
 
         public static IValueConverter Converter = TimeConverter.FromList();
 

src/AngleSharp.Css/Declarations/AnimationDirectionDeclaration.cs

@@ -9,10 +9,10 @@ namespace AngleSharp.Css.Declarations
     {
         public static String Name = PropertyNames.AnimationDirection;
 
-        public static String[] Shorthands = new[]
-        {
+        public static String[] Shorthands =
+        [
             PropertyNames.Animation,
-        };
+        ];
 
         public static IValueConverter Converter = AnimationDirectionConverter.FromList();
 

src/AngleSharp.Css/Declarations/AnimationDurationDeclaration.cs

@@ -9,10 +9,10 @@ namespace AngleSharp.Css.Declarations
     {
         public static String Name = PropertyNames.AnimationDuration;
 
-        public static String[] Shorthands = new[]
-        {
+        public static String[] Shorthands =
+        [
             PropertyNames.Animation,
-        };
+        ];
 
         public static IValueConverter Converter = TimeConverter.FromList();
 

src/AngleSharp.Css/Declarations/AnimationFillModeDeclaration.cs

@@ -9,10 +9,10 @@ namespace AngleSharp.Css.Declarations
     {
         public static String Name = PropertyNames.AnimationFillMode;
 
-        public static String[] Shorthands = new[]
-        {
+        public static String[] Shorthands =
+        [
             PropertyNames.Animation,
-        };
+        ];
 
         public static IValueConverter Converter = AnimationFillStyleConverter.FromList();
 

src/AngleSharp.Css/Declarations/AnimationIterationCountDeclaration.cs

@@ -9,10 +9,10 @@ namespace AngleSharp.Css.Declarations
     {
         public static String Name = PropertyNames.AnimationIterationCount;
 
-        public static String[] Shorthands = new[]
-        {
+        public static String[] Shorthands =
+        [
             PropertyNames.Animation,
-        };
+        ];
 
         public static IValueConverter Converter = PositiveOrInfiniteNumberConverter.FromList();
 

src/AngleSharp.Css/Declarations/AnimationNameDeclaration.cs

@@ -9,10 +9,10 @@ namespace AngleSharp.Css.Declarations
     {
         public static String Name = PropertyNames.AnimationName;
 
-        public static String[] Shorthands = new[]
-        {
+        public static String[] Shorthands =
+        [
             PropertyNames.Animation,
-        };
+        ];
 
         public static IValueConverter Converter = Or(IdentifierConverter.FromList(), None);
 

src/AngleSharp.Css/Declarations/AnimationPlayStateDeclaration.cs

@@ -9,10 +9,10 @@ namespace AngleSharp.Css.Declarations
     {
         public static String Name = PropertyNames.AnimationPlayState;
 
-        public static String[] Shorthands = new[]
-        {
+        public static String[] Shorthands =
+        [
             PropertyNames.Animation,
-        };
+        ];
 
         public static IValueConverter Converter = PlayStateConverter.FromList();
 

src/AngleSharp.Css/Declarations/AnimationTimingFunctionDeclaration.cs

@@ -9,10 +9,10 @@ namespace AngleSharp.Css.Declarations
     {
         public static String Name = PropertyNames.AnimationTimingFunction;
 
-        public static String[] Shorthands = new[]
-        {
+        public static String[] Shorthands =
+        [
             PropertyNames.Animation,
-        };
+        ];
 
         public static IValueConverter Converter = TransitionConverter.FromList();
 

src/AngleSharp.Css/Declarations/BackgroundAttachmentDeclaration.cs

@@ -9,10 +9,10 @@ namespace AngleSharp.Css.Declarations
     {
         public static String Name = PropertyNames.BackgroundAttachment;
 
-        public static String[] Shorthands = new[]
-        {
+        public static String[] Shorthands =
+        [
             PropertyNames.Background,
-        };
+        ];
 
         public static IValueConverter Converter = BackgroundAttachmentConverter.FromList();
 

src/AngleSharp.Css/Declarations/BackgroundClipDeclaration.cs

@@ -9,10 +9,10 @@ namespace AngleSharp.Css.Declarations
     {
         public static String Name = PropertyNames.BackgroundClip;
 
-        public static String[] Shorthands = new[]
-        {
+        public static String[] Shorthands =
+        [
             PropertyNames.Background,
-        };
+        ];
 
         public static IValueConverter Converter = BoxModelConverter.FromList();
 

src/AngleSharp.Css/Declarations/BackgroundColorDeclaration.cs

@@ -8,10 +8,10 @@ namespace AngleSharp.Css.Declarations
     {
         public static String Name = PropertyNames.BackgroundColor;
 
-        public static String[] Shorthands = new[]
-        {
+        public static String[] Shorthands =
+        [
             PropertyNames.Background,
-        };
+        ];
 
         public static IValueConverter Converter = CurrentColorConverter;
 

src/AngleSharp.Css/Declarations/BackgroundDeclaration.cs

@@ -14,12 +14,12 @@ namespace AngleSharp.Css.Declarations
 
         public static IValueConverter Converter = new BackgroundAggregator();
 
-        public static ICssValue InitialValue = null;
+        public static ICssValue? InitialValue = null;
 
         public static PropertyFlags Flags = PropertyFlags.Animatable | PropertyFlags.Shorthand;
 
-        public static String[] Longhands = new[]
-        {
+        public static String[] Longhands =
+        [
             PropertyNames.BackgroundImage,
             PropertyNames.BackgroundPosition,
             PropertyNames.BackgroundSize,
@@ -28,11 +28,11 @@ namespace AngleSharp.Css.Declarations
             PropertyNames.BackgroundOrigin,
             PropertyNames.BackgroundClip,
             PropertyNames.BackgroundColor,
-        };
+        ];
 
         sealed class BackgroundAggregator : IValueAggregator, IValueConverter
         {
-            public ICssValue Convert(StringSource source)
+            public ICssValue? Convert(StringSource source)
             {
                 // [ <bg-layer> , ]* <final-bg-layer>
                 // where:
@@ -177,7 +177,7 @@ namespace AngleSharp.Css.Declarations
                 return new CssBackgroundValue(new CssListValue(layers.OfType<ICssValue>().ToArray()), color ?? new CssInitialValue(InitialValues.BackgroundColorDecl));
             }
 
-            public ICssValue Merge(ICssValue[] values)
+            public ICssValue? Merge(ICssValue[] values)
             {
                 var image = GetList(values[0]);
                 var position = GetList(values[1]);
@@ -197,7 +197,7 @@ namespace AngleSharp.Css.Declarations
                 return null;
             }
 
-            private static CssListValue GetList(ICssValue value)
+            private static CssListValue? GetList(ICssValue value)
             {
                 if (value is CssListValue list)
                 {
@@ -211,12 +211,12 @@ namespace AngleSharp.Css.Declarations
                 return null;
             }
 
-            public ICssValue[] Split(ICssValue value)
+            public ICssValue?[]? Split(ICssValue value)
             {
                 if (value is CssBackgroundValue background)
                 {
-                    return new[]
-                    {
+                    return
+                    [
                         CreateMultiple(background, m => m.Image, InitialValues.BackgroundImageDecl),
                         CreateMultiple(background, m => m.Position, InitialValues.BackgroundPositionDecl),
                         CreateMultiple(background, m => m.Size, InitialValues.BackgroundSizeDecl),
@@ -225,13 +225,13 @@ namespace AngleSharp.Css.Declarations
                         CreateMultiple(background, m => m.Origin, InitialValues.BackgroundOriginDecl),
                         CreateMultiple(background, m => m.Clip, InitialValues.BackgroundClipDecl),
                         background.Color,
-                    };
+                    ];
                 }
 
                 return null;
             }
             
-            private static ICssValue CreateLayers(CssListValue image, CssListValue attachment, CssListValue clip, CssListValue position, CssListValue origin, CssListValue repeat, CssListValue size)
+            private static ICssValue? CreateLayers(CssListValue? image, CssListValue? attachment, CssListValue? clip, CssListValue? position, CssListValue? origin, CssListValue? repeat, CssListValue? size)
             {
                 var count = GetCount(image, attachment, clip, position, size, repeat, origin);
 
@@ -257,7 +257,7 @@ namespace AngleSharp.Css.Declarations
                 return null;
             }
 
-            private static Int32 GetCount(params CssListValue[] lists)
+            private static Int32 GetCount(params CssListValue?[] lists)
             {
                 var count = 0;
 
@@ -269,7 +269,7 @@ namespace AngleSharp.Css.Declarations
                 return count;
             }
 
-            private static ICssValue GetValue(CssListValue container, Int32 index)
+            private static ICssValue? GetValue(CssListValue? container, Int32 index)
             {
                 if (container != null && index < container.Items.Length)
                 {
@@ -279,7 +279,7 @@ namespace AngleSharp.Css.Declarations
                 return null;
             }
 
-            private static ICssValue CreateMultiple(CssBackgroundValue background, Func<CssBackgroundLayerValue, ICssValue> getValue, ICssValue initialValue)
+            private static ICssValue? CreateMultiple(CssBackgroundValue background, Func<CssBackgroundLayerValue, ICssValue> getValue, ICssValue initialValue)
             {
                 if (background.Layers is CssListValue layers)
                 {

src/AngleSharp.Css/Declarations/BackgroundImageDeclaration.cs

@@ -8,10 +8,10 @@ namespace AngleSharp.Css.Declarations
     {
         public static String Name = PropertyNames.BackgroundImage;
 
-        public static String[] Shorthands = new[]
-        {
+        public static String[] Shorthands =
+        [
             PropertyNames.Background,
-        };
+        ];
 
         public static IValueConverter Converter = MultipleImageSourceConverter;
 

src/AngleSharp.Css/Declarations/BackgroundOriginDeclaration.cs

@@ -9,10 +9,10 @@ namespace AngleSharp.Css.Declarations
     {
         public static String Name = PropertyNames.BackgroundOrigin;
 
-        public static String[] Shorthands = new[]
-        {
+        public static String[] Shorthands =
+        [
             PropertyNames.Background,
-        };
+        ];
 
         public static IValueConverter Converter = BoxModelConverter.FromList();
 

src/AngleSharp.Css/Declarations/BackgroundPositionDeclaration.cs

@@ -12,16 +12,16 @@ namespace AngleSharp.Css.Declarations
     {
         public static String Name = PropertyNames.BackgroundPosition;
 
-        public static String[] Shorthands = new[]
-        {
+        public static String[] Shorthands =
+        [
             PropertyNames.Background,
-        };
+        ];
 
-        public static String[] Longhands = new[]
-        {
+        public static String[] Longhands =
+        [
             PropertyNames.BackgroundPositionX,
             PropertyNames.BackgroundPositionY,
-        };
+        ];
 
         public static IValueConverter Converter = new BackgroundPositionAggregator();
 
@@ -63,11 +63,11 @@ namespace AngleSharp.Css.Declarations
                     var points = list.Items.OfType<CssPoint2D>();
                     var x = points.Select(m => m.X).ToArray();
                     var y = points.Select(m => m.Y).ToArray();
-                    return new ICssValue[]
-                    {
+                    return
+                    [
                         new CssListValue(x),
                         new CssListValue(y),
-                    };
+                    ];
                 }
 
                 return null;

src/AngleSharp.Css/Declarations/BackgroundPositionXDeclaration.cs

@@ -9,10 +9,10 @@ namespace AngleSharp.Css.Declarations
     {
         public static String Name = PropertyNames.BackgroundPositionX;
 
-        public static String[] Shorthands = new[]
-        {
+        public static String[] Shorthands =
+        [
             PropertyNames.BackgroundPosition,
-        };
+        ];
 
         public static IValueConverter Converter = PointXConverter.FromList();
 

src/AngleSharp.Css/Declarations/BackgroundPositionYDeclaration.cs

@@ -9,10 +9,10 @@ namespace AngleSharp.Css.Declarations
     {
         public static String Name = PropertyNames.BackgroundPositionY;
 
-        public static String[] Shorthands = new[]
-        {
+        public static String[] Shorthands =
+        [
             PropertyNames.BackgroundPosition,
-        };
+        ];
 
         public static IValueConverter Converter = PointYConverter.FromList();
 

src/AngleSharp.Css/Declarations/BackgroundRepeatDeclaration.cs

@@ -12,16 +12,16 @@ namespace AngleSharp.Css.Declarations
     {
         public static String Name = PropertyNames.BackgroundRepeat;
 
-        public static String[] Shorthands = new[]
-        {
+        public static String[] Shorthands =
+        [
             PropertyNames.Background,
-        };
+        ];
 
-        public static String[] Longhands = new[]
-        {
+        public static String[] Longhands =
+        [
             PropertyNames.BackgroundRepeatX,
             PropertyNames.BackgroundRepeatY,
-        };
+        ];
 
         public static IValueConverter Converter = new BackgroundRepeatAggregator();
 
@@ -63,11 +63,11 @@ namespace AngleSharp.Css.Declarations
                     var repeats = list.Items.OfType<CssImageRepeatsValue>();
                     var h = repeats.Select(m => m.Horizontal).ToArray();
                     var v = repeats.Select(m => m.Vertical).ToArray();
-                    return new ICssValue[]
-                    {
+                    return
+                    [
                         new CssListValue(h),
                         new CssListValue(v),
-                    };
+                    ];
                 }
 
                 return null;

src/AngleSharp.Css/Declarations/BackgroundRepeatXDeclaration.cs

@@ -9,10 +9,10 @@ namespace AngleSharp.Css.Declarations
     {
         public static String Name = PropertyNames.BackgroundRepeatX;
 
-        public static String[] Shorthands = new[]
-        {
+        public static String[] Shorthands =
+        [
             PropertyNames.BackgroundRepeat,
-        };
+        ];
 
         public static IValueConverter Converter = BackgroundRepeatConverter.FromList();
 

src/AngleSharp.Css/Declarations/BackgroundRepeatYDeclaration.cs

@@ -9,10 +9,10 @@ namespace AngleSharp.Css.Declarations
     {
         public static String Name = PropertyNames.BackgroundRepeatY;
 
-        public static String[] Shorthands = new[]
-        {
+        public static String[] Shorthands =
+        [
             PropertyNames.BackgroundRepeat,
-        };
+        ];
 
         public static IValueConverter Converter = BackgroundRepeatConverter.FromList();
 

src/AngleSharp.Css/Declarations/BackgroundSizeDeclaration.cs

@@ -9,10 +9,10 @@ namespace AngleSharp.Css.Declarations
     {
         public static String Name = PropertyNames.BackgroundSize;
 
-        public static String[] Shorthands = new[]
-        {
+        public static String[] Shorthands =
+        [
             PropertyNames.Background,
-        };
+        ];
 
         public static IValueConverter Converter = BackgroundSizeConverter.FromList();
 

src/AngleSharp.Css/Declarations/BorderBottomColorDeclaration.cs

@@ -8,12 +8,12 @@ namespace AngleSharp.Css.Declarations
     {
         public static String Name = PropertyNames.BorderBottomColor;
 
-        public static String[] Shorthands = new[]
-        {
+        public static String[] Shorthands =
+        [
             PropertyNames.Border,
             PropertyNames.BorderBottom,
             PropertyNames.BorderColor,
-        };
+        ];
 
         public static IValueConverter Converter = CurrentColorConverter;
 

src/AngleSharp.Css/Declarations/BorderBottomDeclaration.cs

@@ -8,10 +8,10 @@ namespace AngleSharp.Css.Declarations
     {
         public static String Name = PropertyNames.BorderBottom;
 
-        public static String[] Shorthands = new[]
-        {
+        public static String[] Shorthands =
+        [
             PropertyNames.Border,
-        };
+        ];
 
         public static IValueConverter Converter = WithBorderSide(
             InitialValues.BorderBottomWidthDecl,
@@ -22,11 +22,11 @@ namespace AngleSharp.Css.Declarations
 
         public static PropertyFlags Flags = PropertyFlags.Animatable | PropertyFlags.Shorthand;
 
-        public static String[] Longhands = new[]
-        {
+        public static String[] Longhands =
+        [
             PropertyNames.BorderBottomWidth,
             PropertyNames.BorderBottomStyle,
             PropertyNames.BorderBottomColor,
-        };
+        ];
     }
 }

src/AngleSharp.Css/Declarations/BorderBottomLeftRadiusDeclaration.cs

@@ -8,10 +8,10 @@ namespace AngleSharp.Css.Declarations
     {
         public static String Name = PropertyNames.BorderBottomLeftRadius;
 
-        public static String[] Shorthands = new[]
-        {
+        public static String[] Shorthands =
+        [
             PropertyNames.BorderRadius,
-        };
+        ];
 
         public static IValueConverter Converter = BorderRadiusLonghandConverter;
 

src/AngleSharp.Css/Declarations/BorderBottomRightRadiusDeclaration.cs

@@ -8,10 +8,10 @@ namespace AngleSharp.Css.Declarations
     {
         public static String Name = PropertyNames.BorderBottomRightRadius;
 
-        public static String[] Shorthands = new[]
-        {
+        public static String[] Shorthands =
+        [
             PropertyNames.BorderRadius,
-        };
+        ];
 
         public static IValueConverter Converter = BorderRadiusLonghandConverter;
 

src/AngleSharp.Css/Declarations/BorderBottomStyleDeclaration.cs

@@ -8,12 +8,12 @@ namespace AngleSharp.Css.Declarations
     {
         public static String Name = PropertyNames.BorderBottomStyle;
 
-        public static String[] Shorthands = new[]
-        {
+        public static String[] Shorthands =
+        [
             PropertyNames.Border,
             PropertyNames.BorderBottom,
             PropertyNames.BorderStyle,
-        };
+        ];
 
         public static IValueConverter Converter = LineStyleConverter;
 

src/AngleSharp.Css/Declarations/BorderBottomWidthDeclaration.cs

@@ -8,12 +8,12 @@ namespace AngleSharp.Css.Declarations
     {
         public static String Name = PropertyNames.BorderBottomWidth;
 
-        public static String[] Shorthands = new[]
-        {
+        public static String[] Shorthands =
+        [
             PropertyNames.Border,
             PropertyNames.BorderBottom,
             PropertyNames.BorderWidth,
-        };
+        ];
 
         public static IValueConverter Converter = LineWidthConverter;
 

src/AngleSharp.Css/Declarations/BorderColorDeclaration.cs

@@ -8,10 +8,10 @@ namespace AngleSharp.Css.Declarations
     {
         public static String Name = PropertyNames.BorderColor;
 
-        public static String[] Shorthands = new[]
-        {
+        public static String[] Shorthands =
+        [
             PropertyNames.Border,
-        };
+        ];
 
         public static IValueConverter Converter = AggregatePeriodic(CurrentColorConverter);
 
@@ -19,12 +19,12 @@ namespace AngleSharp.Css.Declarations
 
         public static PropertyFlags Flags = PropertyFlags.Hashless | PropertyFlags.Animatable | PropertyFlags.Shorthand;
 
-        public static String[] Longhands = new[]
-        {
+        public static String[] Longhands =
+        [
             PropertyNames.BorderTopColor,
             PropertyNames.BorderRightColor,
             PropertyNames.BorderBottomColor,
             PropertyNames.BorderLeftColor,
-        };
+        ];
     }
 }

src/AngleSharp.Css/Declarations/BorderDeclaration.cs

@@ -18,12 +18,12 @@ namespace AngleSharp.Css.Declarations
 
         public static PropertyFlags Flags = PropertyFlags.Animatable | PropertyFlags.Shorthand;
 
-        public static String[] Longhands = new[]
-        {
+        public static String[] Longhands =
+        [
             PropertyNames.BorderWidth,
             PropertyNames.BorderStyle,
             PropertyNames.BorderColor,
-        };
+        ];
 
         sealed class BorderAggregator : IValueAggregator, IValueConverter
         {
@@ -48,7 +48,7 @@ namespace AngleSharp.Css.Declarations
             {
                 if (value is CssTupleValue options)
                 {
-                    return options.ToArray();
+                    return [.. options];
                 }
 
                 return null;

src/AngleSharp.Css/Declarations/BorderImageDeclaration.cs

@@ -17,14 +17,14 @@ namespace AngleSharp.Css.Declarations
 
         public static PropertyFlags Flags = PropertyFlags.Shorthand;
 
-        public static String[] Longhands = new[]
-        {
+        public static String[] Longhands =
+        [
             PropertyNames.BorderImageOutset,
             PropertyNames.BorderImageRepeat,
             PropertyNames.BorderImageSlice,
             PropertyNames.BorderImageSource,
             PropertyNames.BorderImageWidth,
-        };
+        ];
 
         sealed class BorderImageValueConverter : IValueConverter
         {
@@ -103,7 +103,7 @@ namespace AngleSharp.Css.Declarations
                 }
                 else
                 {
-                    return new CssTupleValue(new[] { repeatX, repeatY });
+                    return new CssTupleValue([repeatX, repeatY]);
                 }
             }
         }
@@ -137,25 +137,25 @@ namespace AngleSharp.Css.Declarations
             {
                 if (value is CssBorderImageValue img)
                 {
-                    return new ICssValue[]
-                    {
+                    return
+                    [
                         img.Outsets,
                         img.Repeat,
                         img.Slice,
                         img.Image,
                         img.Widths,
-                    };
+                    ];
                 }
                 else if (value is CssConstantValue<Object> constant)
                 {
-                    return new ICssValue[]
-                    {
+                    return
+                    [
                         null,
                         null,
                         null,
                         constant,
                         null,
-                    };
+                    ];
                 }
 
                 return null;

src/AngleSharp.Css/Declarations/BorderImageOutsetDeclaration.cs

@@ -9,10 +9,10 @@ namespace AngleSharp.Css.Declarations
     {
         public static String Name = PropertyNames.BorderImageOutset;
 
-        public static String[] Shorthands = new[]
-        {
+        public static String[] Shorthands =
+        [
             PropertyNames.BorderImage,
-        };
+        ];
 
         public static IValueConverter Converter = LengthOrPercentConverter.Periodic();
 

src/AngleSharp.Css/Declarations/BorderImageRepeatDeclaration.cs

@@ -8,10 +8,10 @@ namespace AngleSharp.Css.Declarations
     {
         public static String Name = PropertyNames.BorderImageRepeat;
 
-        public static String[] Shorthands = new[]
-        {
+        public static String[] Shorthands =
+        [
             PropertyNames.BorderImage,
-        };
+        ];
 
         public static IValueConverter Converter = BorderImageRepeatConverter;
 

src/AngleSharp.Css/Declarations/BorderImageSliceDeclaration.cs

@@ -8,10 +8,10 @@ namespace AngleSharp.Css.Declarations
     {
         public static String Name = PropertyNames.BorderImageSlice;
 
-        public static String[] Shorthands = new[]
-        {
+        public static String[] Shorthands =
+        [
             PropertyNames.BorderImage,
-        };
+        ];
 
         public static IValueConverter Converter = BorderImageSliceConverter;
 

src/AngleSharp.Css/Declarations/BorderImageSourceDeclaration.cs

@@ -8,10 +8,10 @@ namespace AngleSharp.Css.Declarations
     {
         public static String Name = PropertyNames.BorderImageSource;
 
-        public static String[] Shorthands = new[]
-        {
+        public static String[] Shorthands =
+        [
             PropertyNames.BorderImage,
-        };
+        ];
 
         public static IValueConverter Converter = OptionalImageSourceConverter;
 

src/AngleSharp.Css/Declarations/BorderImageWidthDeclaration.cs

@@ -8,10 +8,10 @@ namespace AngleSharp.Css.Declarations
     {
         public static String Name = PropertyNames.BorderImageWidth;
 
-        public static String[] Shorthands = new[]
-        {
+        public static String[] Shorthands =
+        [
             PropertyNames.BorderImage,
-        };
+        ];
 
         public static IValueConverter Converter = BorderImageWidthConverter;
 

src/AngleSharp.Css/Declarations/BorderLeftColorDeclaration.cs

@@ -8,12 +8,12 @@ namespace AngleSharp.Css.Declarations
     {
         public static String Name = PropertyNames.BorderLeftColor;
 
-        public static String[] Shorthands = new[]
-        {
+        public static String[] Shorthands =
+        [
             PropertyNames.Border,
             PropertyNames.BorderLeft,
             PropertyNames.BorderColor,
-        };
+        ];
 
         public static IValueConverter Converter = CurrentColorConverter;
 

src/AngleSharp.Css/Declarations/BorderLeftDeclaration.cs

@@ -8,10 +8,10 @@ namespace AngleSharp.Css.Declarations
     {
         public static String Name = PropertyNames.BorderLeft;
 
-        public static String[] Shorthands = new[]
-        {
+        public static String[] Shorthands =
+        [
             PropertyNames.Border,
-        };
+        ];
 
         public static IValueConverter Converter = WithBorderSide(
             InitialValues.BorderLeftWidthDecl,
@@ -22,11 +22,11 @@ namespace AngleSharp.Css.Declarations
 
         public static PropertyFlags Flags = PropertyFlags.Animatable | PropertyFlags.Shorthand;
 
-        public static String[] Longhands = new[]
-        {
+        public static String[] Longhands =
+        [
             PropertyNames.BorderLeftWidth,
             PropertyNames.BorderLeftStyle,
             PropertyNames.BorderLeftColor,
-        };
+        ];
     }
 }

src/AngleSharp.Css/Declarations/BorderLeftStyleDeclaration.cs

@@ -8,12 +8,12 @@ namespace AngleSharp.Css.Declarations
     {
         public static String Name = PropertyNames.BorderLeftStyle;
 
-        public static String[] Shorthands = new[]
-        {
+        public static String[] Shorthands =
+        [
             PropertyNames.Border,
             PropertyNames.BorderLeft,
             PropertyNames.BorderStyle,
-        };
+        ];
 
         public static IValueConverter Converter = LineStyleConverter;
 

src/AngleSharp.Css/Declarations/BorderLeftWidthDeclaration.cs

@@ -8,12 +8,12 @@ namespace AngleSharp.Css.Declarations
     {
         public static String Name = PropertyNames.BorderLeftWidth;
 
-        public static String[] Shorthands = new[]
-        {
+        public static String[] Shorthands =
+        [
             PropertyNames.Border,
             PropertyNames.BorderLeft,
             PropertyNames.BorderWidth,
-        };
+        ];
 
         public static IValueConverter Converter = LineWidthConverter;
 

src/AngleSharp.Css/Declarations/BorderRadiusDeclaration.cs

@@ -18,13 +18,13 @@ namespace AngleSharp.Css.Declarations
 
         public static PropertyFlags Flags = PropertyFlags.Animatable | PropertyFlags.Shorthand;
 
-        public static String[] Longhands = new[]
-        {
+        public static String[] Longhands =
+        [
             PropertyNames.BorderTopLeftRadius,
             PropertyNames.BorderTopRightRadius,
             PropertyNames.BorderBottomRightRadius,
             PropertyNames.BorderBottomLeftRadius,
-        };
+        ];
 
         sealed class BorderRadiusAggregator : IValueAggregator, IValueConverter
         {
@@ -57,8 +57,8 @@ namespace AngleSharp.Css.Declarations
 
                 if (topLeft != null && topRight != null && bottomRight != null && bottomLeft != null)
                 {
-                    var horizontal = new CssPeriodicValue(new[] { topLeft.Width, topRight.Width, bottomRight.Width, bottomLeft.Width });
-                    var vertical = new CssPeriodicValue(new[] { topLeft.Height, topRight.Height, bottomRight.Height, bottomLeft.Height });
+                    var horizontal = new CssPeriodicValue([topLeft.Width, topRight.Width, bottomRight.Width, bottomLeft.Width]);
+                    var vertical = new CssPeriodicValue([topLeft.Height, topRight.Height, bottomRight.Height, bottomLeft.Height]);
                     return new CssBorderRadiusValue(horizontal, vertical);
                 }
 
@@ -69,13 +69,13 @@ namespace AngleSharp.Css.Declarations
             {
                 if (value is CssBorderRadiusValue radius)
                 {
-                    return new[]
-                    {
+                    return
+                    [
                         Both(radius.Horizontal.Top, radius.Vertical.Top),
                         Both(radius.Horizontal.Right, radius.Vertical.Right),
                         Both(radius.Horizontal.Bottom, radius.Vertical.Bottom),
                         Both(radius.Horizontal.Left, radius.Vertical.Left),
-                    };
+                    ];
                 }
 
                 return null;

src/AngleSharp.Css/Declarations/BorderRightColorDeclaration.cs

@@ -8,12 +8,12 @@ namespace AngleSharp.Css.Declarations
     {
         public static String Name = PropertyNames.BorderRightColor;
 
-        public static String[] Shorthands = new[]
-        {
+        public static String[] Shorthands =
+        [
             PropertyNames.Border,
             PropertyNames.BorderRight,
             PropertyNames.BorderColor,
-        };
+        ];
 
         public static IValueConverter Converter = CurrentColorConverter;
 

src/AngleSharp.Css/Declarations/BorderRightDeclaration.cs

@@ -8,10 +8,10 @@ namespace AngleSharp.Css.Declarations
     {
         public static String Name = PropertyNames.BorderRight;
 
-        public static String[] Shorthands = new[]
-        {
+        public static String[] Shorthands =
+        [
             PropertyNames.Border,
-        };
+        ];
 
         public static IValueConverter Converter = WithBorderSide(
             InitialValues.BorderRightWidthDecl,
@@ -22,11 +22,11 @@ namespace AngleSharp.Css.Declarations
 
         public static PropertyFlags Flags = PropertyFlags.Animatable | PropertyFlags.Shorthand;
 
-        public static String[] Longhands = new[]
-        {
+        public static String[] Longhands =
+        [
             PropertyNames.BorderRightWidth,
             PropertyNames.BorderRightStyle,
             PropertyNames.BorderRightColor,
-        };
+        ];
     }
 }

src/AngleSharp.Css/Declarations/BorderRightStyleDeclaration.cs

@@ -8,12 +8,12 @@ namespace AngleSharp.Css.Declarations
     {
         public static String Name = PropertyNames.BorderRightStyle;
 
-        public static String[] Shorthands = new[]
-        {
+        public static String[] Shorthands =
+        [
             PropertyNames.Border,
             PropertyNames.BorderRight,
             PropertyNames.BorderStyle,
-        };
+        ];
 
         public static IValueConverter Converter = LineStyleConverter;
 

src/AngleSharp.Css/Declarations/BorderRightWidthDeclaration.cs

@@ -8,12 +8,12 @@ namespace AngleSharp.Css.Declarations
     {
         public static String Name = PropertyNames.BorderRightWidth;
 
-        public static String[] Shorthands = new[]
-        {
+        public static String[] Shorthands =
+        [
             PropertyNames.Border,
             PropertyNames.BorderRight,
             PropertyNames.BorderWidth,
-        };
+        ];
 
         public static IValueConverter Converter = LineWidthConverter;
 

src/AngleSharp.Css/Declarations/BorderStyleDeclaration.cs

@@ -8,10 +8,10 @@ namespace AngleSharp.Css.Declarations
     {
         public static String Name = PropertyNames.BorderStyle;
 
-        public static String[] Shorthands = new[]
-        {
+        public static String[] Shorthands =
+        [
             PropertyNames.Border,
-        };
+        ];
 
         public static IValueConverter Converter = AggregatePeriodic(LineStyleConverter);
 
@@ -19,12 +19,12 @@ namespace AngleSharp.Css.Declarations
 
         public static PropertyFlags Flags = PropertyFlags.Shorthand;
 
-        public static String[] Longhands = new[]
-        {
+        public static String[] Longhands =
+        [
             PropertyNames.BorderTopStyle,
             PropertyNames.BorderRightStyle,
             PropertyNames.BorderBottomStyle,
             PropertyNames.BorderLeftStyle,
-        };
+        ];
     }
 }

src/AngleSharp.Css/Declarations/BorderTopColorDeclaration.cs

@@ -8,12 +8,12 @@ namespace AngleSharp.Css.Declarations
     {
         public static String Name = PropertyNames.BorderTopColor;
 
-        public static String[] Shorthands = new[]
-        {
+        public static String[] Shorthands =
+        [
             PropertyNames.Border,
             PropertyNames.BorderTop,
             PropertyNames.BorderColor,
-        };
+        ];
 
         public static IValueConverter Converter = CurrentColorConverter;
 

src/AngleSharp.Css/Declarations/BorderTopDeclaration.cs

@@ -8,10 +8,10 @@ namespace AngleSharp.Css.Declarations
     {
         public static String Name = PropertyNames.BorderTop;
 
-        public static String[] Shorthands = new[]
-        {
+        public static String[] Shorthands =
+        [
             PropertyNames.Border,
-        };
+        ];
 
         public static IValueConverter Converter = WithBorderSide(
             InitialValues.BorderTopWidthDecl,
@@ -22,11 +22,11 @@ namespace AngleSharp.Css.Declarations
 
         public static PropertyFlags Flags = PropertyFlags.Animatable | PropertyFlags.Shorthand;
 
-        public static String[] Longhands = new[]
-        {
+        public static String[] Longhands =
+        [
             PropertyNames.BorderTopWidth,
             PropertyNames.BorderTopStyle,
             PropertyNames.BorderTopColor,
-        };
+        ];
     }
 }

src/AngleSharp.Css/Declarations/BorderTopLeftRadiusDeclaration.cs

@@ -8,10 +8,10 @@ namespace AngleSharp.Css.Declarations
     {
         public static String Name = PropertyNames.BorderTopLeftRadius;
 
-        public static String[] Shorthands = new[]
-        {
+        public static String[] Shorthands =
+        [
             PropertyNames.BorderRadius,
-        };
+        ];
 
         public static IValueConverter Converter = BorderRadiusLonghandConverter;
 

src/AngleSharp.Css/Declarations/BorderTopRightRadiusDeclaration.cs

@@ -8,10 +8,10 @@ namespace AngleSharp.Css.Declarations
     {
         public static String Name = PropertyNames.BorderTopRightRadius;
 
-        public static String[] Shorthands = new[]
-        {
+        public static String[] Shorthands =
+        [
             PropertyNames.BorderRadius,
-        };
+        ];
 
         public static IValueConverter Converter = BorderRadiusLonghandConverter;
 

src/AngleSharp.Css/Declarations/BorderTopStyleDeclaration.cs

@@ -8,12 +8,12 @@ namespace AngleSharp.Css.Declarations
     {
         public static String Name = PropertyNames.BorderTopStyle;
 
-        public static String[] Shorthands = new[]
-        {
+        public static String[] Shorthands =
+        [
             PropertyNames.Border,
             PropertyNames.BorderTop,
             PropertyNames.BorderStyle,
-        };
+        ];
 
         public static IValueConverter Converter = LineStyleConverter;
 

src/AngleSharp.Css/Declarations/BorderTopWidthDeclaration.cs

@@ -8,12 +8,12 @@ namespace AngleSharp.Css.Declarations
     {
         public static String Name = PropertyNames.BorderTopWidth;
 
-        public static String[] Shorthands = new[]
-        {
+        public static String[] Shorthands =
+        [
             PropertyNames.Border,
             PropertyNames.BorderTop,
             PropertyNames.BorderWidth,
-        };
+        ];
 
         public static IValueConverter Converter = LineWidthConverter;
 

src/AngleSharp.Css/Declarations/BorderWidthDeclaration.cs

@@ -8,10 +8,10 @@ namespace AngleSharp.Css.Declarations
     {
         public static String Name = PropertyNames.BorderWidth;
 
-        public static String[] Shorthands = new[]
-        {
+        public static String[] Shorthands =
+        [
             PropertyNames.Border,
-        };
+        ];
 
         public static IValueConverter Converter = AggregatePeriodic(LineWidthConverter);
 
@@ -19,12 +19,12 @@ namespace AngleSharp.Css.Declarations
 
         public static PropertyFlags Flags = PropertyFlags.Animatable | PropertyFlags.Shorthand;
 
-        public static String[] Longhands = new[]
-        {
+        public static String[] Longhands =
+        [
             PropertyNames.BorderTopWidth,
             PropertyNames.BorderRightWidth,
             PropertyNames.BorderBottomWidth,
             PropertyNames.BorderLeftWidth,
-        };
+        ];
     }
 }

src/AngleSharp.Css/Declarations/ColumnCountDeclaration.cs

@@ -8,10 +8,10 @@ namespace AngleSharp.Css.Declarations
     {
         public static String Name = PropertyNames.ColumnCount;
 
-        public static String[] Shorthands = new[]
-        {
+        public static String[] Shorthands =
+        [
             PropertyNames.Columns,
-        };
+        ];
 
         public static IValueConverter Converter = OptionalIntegerConverter;
 

src/AngleSharp.Css/Declarations/ColumnGapDeclaration.cs

@@ -8,10 +8,10 @@ namespace AngleSharp.Css.Declarations
     {
         public static String Name = PropertyNames.ColumnGap;
 
-        public static readonly String[] Shorthands = new[]
-        {
+        public static readonly String[] Shorthands =
+        [
             PropertyNames.Gap,
-        };
+        ];
 
         public static IValueConverter Converter = GapConverter;
 

src/AngleSharp.Css/Declarations/ColumnRuleColorDeclaration.cs

@@ -8,10 +8,10 @@ namespace AngleSharp.Css.Declarations
     {
         public static String Name = PropertyNames.ColumnRuleColor;
 
-        public static String[] Shorthands = new[]
-        {
+        public static String[] Shorthands =
+        [
             PropertyNames.ColumnRule,
-        };
+        ];
 
         public static IValueConverter Converter = ColorConverter;
 

src/AngleSharp.Css/Declarations/ColumnRuleDeclaration.cs

@@ -16,12 +16,12 @@ namespace AngleSharp.Css.Declarations
 
         public static PropertyFlags Flags = PropertyFlags.Animatable | PropertyFlags.Shorthand;
 
-        public static String[] Longhands = new[]
-        {
+        public static String[] Longhands =
+        [
             PropertyNames.ColumnRuleColor,
             PropertyNames.ColumnRuleWidth,
             PropertyNames.ColumnRuleStyle,
-        };
+        ];
 
         sealed class ColumnRuleValueConverter : IValueConverter
         {
@@ -87,12 +87,12 @@ namespace AngleSharp.Css.Declarations
             {
                 if (value is CssTupleValue options)
                 {
-                    return new[]
-                    {
+                    return
+                    [
                         options.Items[0],
                         options.Items[1],
                         options.Items[2],
-                    };
+                    ];
                 }
 
                 return null;

src/AngleSharp.Css/Declarations/ColumnRuleStyleDeclaration.cs

@@ -8,10 +8,10 @@ namespace AngleSharp.Css.Declarations
     {
         public static String Name = PropertyNames.ColumnRuleStyle;
 
-        public static String[] Shorthands = new[]
-        {
+        public static String[] Shorthands =
+        [
             PropertyNames.ColumnRule,
-        };
+        ];
 
         public static IValueConverter Converter = LineStyleConverter;
 

src/AngleSharp.Css/Declarations/ColumnRuleWidthDeclaration.cs

@@ -8,10 +8,10 @@ namespace AngleSharp.Css.Declarations
     {
         public static String Name = PropertyNames.ColumnRuleWidth;
 
-        public static String[] Shorthands = new[]
-        {
+        public static String[] Shorthands =
+        [
             PropertyNames.ColumnRule,
-        };
+        ];
 
         public static IValueConverter Converter = LineWidthConverter;
 

src/AngleSharp.Css/Declarations/ColumnWidthDeclaration.cs

@@ -8,10 +8,10 @@ namespace AngleSharp.Css.Declarations
     {
         public static String Name = PropertyNames.ColumnWidth;
 
-        public static String[] Shorthands = new[]
-        {
+        public static String[] Shorthands =
+        [
             PropertyNames.Columns,
-        };
+        ];
 
         public static IValueConverter Converter = AutoLengthConverter;
 

src/AngleSharp.Css/Declarations/ColumnsDeclaration.cs

@@ -16,11 +16,11 @@ namespace AngleSharp.Css.Declarations
 
         public static PropertyFlags Flags = PropertyFlags.Animatable | PropertyFlags.Shorthand;
 
-        public static String[] Longhands = new[]
-        {
+        public static String[] Longhands =
+        [
             PropertyNames.ColumnWidth,
             PropertyNames.ColumnCount,
-        };
+        ];
 
         sealed class ColumnsValueConverter : IValueConverter
         {
@@ -57,11 +57,11 @@ namespace AngleSharp.Css.Declarations
             {
                 if (value is CssTupleValue options)
                 {
-                    return new[]
-                    {
+                    return
+                    [
                         options.Items[0],
                         options.Items[1],
-                    };
+                    ];
                 }
 
                 return null;

src/AngleSharp.Css/Declarations/ContentDeclaration.cs

@@ -36,11 +36,11 @@ namespace AngleSharp.Css.Declarations
 
                 if (source.IsIdentifier(CssKeywords.Normal))
                 {
-                    modes = new ICssValue[] { new NormalContentMode() };
+                    modes = [new NormalContentMode()];
                 }
                 else if (source.IsIdentifier(CssKeywords.None))
                 {
-                    modes = new ICssValue[] { };
+                    modes = [];
                 }
                 else
                 {
@@ -97,7 +97,7 @@ namespace AngleSharp.Css.Declarations
 
                     }
 
-                    modes = ms.ToArray();
+                    modes = [.. ms];
                 }
 
                 if (modes != null)
@@ -108,14 +108,9 @@ namespace AngleSharp.Css.Declarations
                 return null;
             }
 
-            private sealed class ContentValue : ICssValue, IEquatable<ContentValue>
+            private sealed class ContentValue(ICssValue[] modes) : ICssValue, IEquatable<ContentValue>
             {
-                private readonly ICssValue[] _modes;
-
-                public ContentValue(ICssValue[] modes)
-                {
-                    _modes = modes;
-                }
+                private readonly ICssValue[] _modes = modes;
 
                 public String CssText => _modes.Length == 0 ? CssKeywords.None : _modes.Join(" ");
 
@@ -220,14 +215,9 @@ namespace AngleSharp.Css.Declarations
             /// <summary>
             /// Text content.
             /// </summary>
-            private sealed class TextContentMode : ContentMode
+            private sealed class TextContentMode(String text) : ContentMode
             {
-                private readonly String _text;
-
-                public TextContentMode(String text)
-                {
-                    _text = text;
-                }
+                private readonly String _text = text;
 
                 public override String GetCssText() => _text.CssString();
 
@@ -249,14 +239,9 @@ namespace AngleSharp.Css.Declarations
             /// in scope at this pseudo-element, from outermost to innermost
             /// separated by the specified string.
             /// </summary>
-            private sealed class CounterContentMode : ContentMode
+            private sealed class CounterContentMode(CssCounterDefinitionValue counter) : ContentMode
             {
-                private readonly CssCounterDefinitionValue _counter;
-
-                public CounterContentMode(CssCounterDefinitionValue counter)
-                {
-                    _counter = counter;
-                }
+                private readonly CssCounterDefinitionValue _counter = counter;
 
                 public override String GetCssText() => _counter.CssText;
 
@@ -277,14 +262,9 @@ namespace AngleSharp.Css.Declarations
             /// Returns the value of the element's attribute X as a string. If
             /// there is no attribute X, an empty string is returned.
             /// </summary>
-            private sealed class AttributeContentMode : ContentMode
+            private sealed class AttributeContentMode(String attribute) : ContentMode
             {
-                private readonly String _attribute;
-
-                public AttributeContentMode(String attribute)
-                {
-                    _attribute = attribute;
-                }
+                private readonly String _attribute = attribute;
 
                 public override String GetCssText() => FunctionNames.Attr.CssFunction(_attribute);
 
@@ -306,14 +286,9 @@ namespace AngleSharp.Css.Declarations
             /// image). If the resource or image can't be displayed, it is either
             /// ignored or some placeholder shows up.
             /// </summary>
-            private sealed class UrlContentMode : ContentMode
+            private sealed class UrlContentMode(CssUrlValue url) : ContentMode
             {
-                private readonly CssUrlValue _url;
-
-                public UrlContentMode(CssUrlValue url)
-                {
-                    _url = url;
-                }
+                private readonly CssUrlValue _url = url;
 
                 public override String GetCssText() => _url.CssText;
 

src/AngleSharp.Css/Declarations/CursorDeclaration.cs

@@ -54,7 +54,7 @@ namespace AngleSharp.Css.Declarations
 
                         if (cursor != null)
                         {
-                            return new CssCursorValue(definitions.ToArray(), cursor);
+                            return new CssCursorValue([.. definitions], cursor);
                         }
 
                         break;

src/AngleSharp.Css/Declarations/FlexBasisDeclaration.cs

@@ -8,10 +8,10 @@ namespace AngleSharp.Css.Declarations
     {
         public static String Name = PropertyNames.FlexBasis;
 
-        public static String[] Shorthands = new[]
-        {
+        public static String[] Shorthands =
+        [
             PropertyNames.Flex,
-        };
+        ];
 
         public static IValueConverter Converter = Or(Content, AutoLengthOrPercentConverter);
 

src/AngleSharp.Css/Declarations/FlexDeclaration.cs

@@ -10,12 +10,12 @@ namespace AngleSharp.Css.Declarations
     {
         public static String Name = PropertyNames.Flex;
 
-        public static String[] Longhands = new[]
-        {
+        public static String[] Longhands =
+        [
             PropertyNames.FlexGrow,
             PropertyNames.FlexShrink,
             PropertyNames.FlexBasis,
-        };
+        ];
 
         public static IValueConverter Converter = new FlexAggregator();
 
@@ -55,12 +55,12 @@ namespace AngleSharp.Css.Declarations
 
                 if (options != null)
                 {
-                    return new[]
-                    {
+                    return
+                    [
                         options.Items[0],
                         options.Items[1],
                         options.Items[2],
-                    };
+                    ];
                 }
 
                 return null;

src/AngleSharp.Css/Declarations/FlexDirectionDeclaration.cs

@@ -8,10 +8,10 @@ namespace AngleSharp.Css.Declarations
     {
         public static String Name = PropertyNames.FlexDirection;
 
-        public static String[] Shorthands = new[]
-        {
+        public static String[] Shorthands =
+        [
             PropertyNames.FlexFlow,
-        };
+        ];
 
         public static IValueConverter Converter = FlexDirectionConverter;
 

src/AngleSharp.Css/Declarations/FlexFlowDeclaration.cs

@@ -10,11 +10,11 @@ namespace AngleSharp.Css.Declarations
     {
         public static String Name = PropertyNames.FlexFlow;
 
-        public static String[] Longhands = new[]
-        {
+        public static String[] Longhands =
+        [
             PropertyNames.FlexDirection,
             PropertyNames.FlexWrap,
-        };
+        ];
 
         public static IValueConverter Converter = new FlexFlowAggregator();
 
@@ -52,11 +52,11 @@ namespace AngleSharp.Css.Declarations
 
                 if (options != null)
                 {
-                    return new[]
-                    {
+                    return
+                    [
                         options.Items[0],
                         options.Items[1],
-                    };
+                    ];
                 }
 
                 return null;

src/AngleSharp.Css/Declarations/FlexGrowDeclaration.cs

@@ -8,10 +8,10 @@ namespace AngleSharp.Css.Declarations
     {
         public static String Name = PropertyNames.FlexGrow;
 
-        public static String[] Shorthands = new[]
-        {
+        public static String[] Shorthands =
+        [
             PropertyNames.Flex,
-        };
+        ];
 
         public static IValueConverter Converter = NumberConverter;
 

src/AngleSharp.Css/Declarations/FlexShrinkDeclaration.cs

@@ -8,10 +8,10 @@ namespace AngleSharp.Css.Declarations
     {
         public static String Name = PropertyNames.FlexShrink;
 
-        public static String[] Shorthands = new[]
-        {
+        public static String[] Shorthands =
+        [
             PropertyNames.Flex,
-        };
+        ];
 
         public static IValueConverter Converter = NumberConverter;
 

src/AngleSharp.Css/Declarations/FlexWrapDeclaration.cs

@@ -8,10 +8,10 @@ namespace AngleSharp.Css.Declarations
     {
         public static String Name = PropertyNames.FlexWrap;
 
-        public static String[] Shorthands = new[]
-        {
+        public static String[] Shorthands =
+        [
             PropertyNames.FlexFlow,
-        };
+        ];
 
         public static IValueConverter Converter = FlexWrapConverter;
 

src/AngleSharp.Css/Declarations/FontDeclaration.cs

@@ -17,8 +17,8 @@ namespace AngleSharp.Css.Declarations
 
         public static PropertyFlags Flags = PropertyFlags.Inherited | PropertyFlags.Animatable | PropertyFlags.Shorthand;
 
-        public static String[] Longhands = new[]
-        {
+        public static String[] Longhands =
+        [
             PropertyNames.FontFamily,
             PropertyNames.FontSize,
             PropertyNames.FontVariant,
@@ -26,7 +26,7 @@ namespace AngleSharp.Css.Declarations
             PropertyNames.FontStretch,
             PropertyNames.FontStyle,
             PropertyNames.LineHeight,
-        };
+        ];
 
         sealed class FontValueConverter : IValueConverter
         {
@@ -139,10 +139,10 @@ namespace AngleSharp.Css.Declarations
                         return null;
                     }
 
-                    return new ICssValue[] { systemFont, null, null, null, null, null, null };
+                    return [systemFont, null, null, null, null, null, null];
                 }
 
-                return new ICssValue[] { font.FontFamilies, font.Size, font.Variant, font.Weight, font.Stretch, font.Style, font.LineHeight };
+                return [font.FontFamilies, font.Size, font.Variant, font.Weight, font.Stretch, font.Style, font.LineHeight];
             }
         }
     }

src/AngleSharp.Css/Declarations/FontFamilyDeclaration.cs

@@ -8,10 +8,10 @@ namespace AngleSharp.Css.Declarations
     {
         public static String Name = PropertyNames.FontFamily;
 
-        public static String[] Shorthands = new[]
-        {
+        public static String[] Shorthands =
+        [
             PropertyNames.Font,
-        };
+        ];
 
         public static IValueConverter Converter = FontFamiliesConverter;
 

src/AngleSharp.Css/Declarations/FontSizeDeclaration.cs

@@ -8,10 +8,10 @@ namespace AngleSharp.Css.Declarations
     {
         public static String Name = PropertyNames.FontSize;
 
-        public static String[] Shorthands = new[]
-        {
+        public static String[] Shorthands =
+        [
             PropertyNames.Font,
-        };
+        ];
 
         public static IValueConverter Converter = FontSizeConverter;
 

src/AngleSharp.Css/Declarations/FontStyleDeclaration.cs

@@ -8,10 +8,10 @@ namespace AngleSharp.Css.Declarations
     {
         public static String Name = PropertyNames.FontStyle;
 
-        public static String[] Shorthands = new[]
-        {
+        public static String[] Shorthands =
+        [
             PropertyNames.Font,
-        };
+        ];
 
         public static IValueConverter Converter = FontStyleConverter;
 

src/AngleSharp.Css/Declarations/FontVariantDeclaration.cs

@@ -8,10 +8,10 @@ namespace AngleSharp.Css.Declarations
     {
         public static String Name = PropertyNames.FontVariant;
 
-        public static String[] Shorthands = new[]
-        {
+        public static String[] Shorthands =
+        [
             PropertyNames.Font,
-        };
+        ];
 
         public static IValueConverter Converter = FontVariantConverter;